Power supply for converting high-power high-voltage constant-current input into constant-voltage output and control method thereof
阅读说明：本技术 一种大功率高压恒流输入转恒压输出的电源及其控制方法 (Power supply for converting high-power high-voltage constant-current input into constant-voltage output and control method thereof ) 是由 钱春建 詹涛 于 2021-01-20 设计创作，主要内容包括：本发明公开了一种大功率高压恒流输入转恒压输出的电源及其控制方法,该电源包括：输入保护单元、主转换单元、输出储能单元、辅助电源单元、控制单元、采样单元和隔离通信单元；输入保护单元的输入端连接高压恒流电,输入保护单元的输出端与主转换单元的输入端连接,主转换单元的输出端与输出储能单元连接,输出储能单元设有储能电容；辅助电源单元的输入端连接高压恒流电母线及输出储能单元；辅助电源单元的输出端连接控制单元；采样单元分别连接高压恒流电、主转换单元和输出储能单元；隔离通信单元设有隔离的通信电路,进行隔离通信传输。本发明提升了单模块的输出功率,解决了传统方案的输出功率做不大的问题,应用场合广。(The invention discloses a power supply for converting high-power high-voltage constant-current input into constant-voltage output and a control method thereof, wherein the power supply comprises: the device comprises an input protection unit, a main conversion unit, an output energy storage unit, an auxiliary power supply unit, a control unit, a sampling unit and an isolation communication unit; the input end of the input protection unit is connected with a high-voltage constant-current power supply, the output end of the input protection unit is connected with the input end of the main conversion unit, the output end of the main conversion unit is connected with the output energy storage unit, and the output energy storage unit is provided with an energy storage capacitor; the input end of the auxiliary power supply unit is connected with the high-voltage constant-current electric bus and the output energy storage unit; the output end of the auxiliary power supply unit is connected with the control unit; the sampling unit is respectively connected with the high-voltage constant-current power supply, the main conversion unit and the output energy storage unit; the isolation communication unit is provided with an isolated communication circuit for isolated communication transmission. The invention improves the output power of the single module, solves the problem that the output power of the traditional scheme is not small, and has wide application occasions.)
1. A high-power high-voltage constant-current input-to-constant-voltage output power supply is characterized by comprising:
the device comprises an input protection unit, a main conversion unit, an output energy storage unit, an auxiliary power supply unit, a control unit, a sampling unit and an isolation communication unit;
the input end of the input protection unit is connected with a high-voltage constant-current power supply, the output end of the input protection unit is connected with the input end of the main conversion unit, the output end of the main conversion unit is connected with the output energy storage unit, the main conversion unit is used for converting the high-voltage constant-current input into a constant-voltage output, and the output energy storage unit is provided with an energy storage capacitor and is used for storing energy and outputting the energy at a constant voltage;
the input end of the auxiliary power supply unit is connected with the high-voltage constant-current bus and the output energy storage unit and is used for taking electricity from the high-voltage constant-current bus and taking electricity from the output energy storage unit;
the output end of the auxiliary power supply unit is connected with the control unit;
the control unit comprises an ADC chip circuit, a single chip circuit and a voltage conversion chip circuit;
the ADC chip circuit is used for converting an analog signal of data collected by the sampling unit into a digital signal and then sending the digital signal to the single chip microcomputer circuit, the single chip microcomputer circuit is used for judging whether the data collected by the sampling unit exceeds a set threshold value, and the voltage conversion chip circuit is used for converting the power supply voltage of the control unit;
the sampling unit is respectively connected with the high-voltage constant-current power supply, the main conversion unit and the output energy storage unit and is used for collecting output voltage and output current of the output energy storage unit, current of the high-voltage constant-current power supply, and input voltage and temperature data of the main conversion unit;
the isolation communication unit is provided with an isolated communication circuit and is used for carrying out isolated communication transmission on the data of the control unit.
2. The power supply for converting high-power high-voltage constant-current input into constant-voltage output according to claim 1, wherein the input protection unit comprises an input anti-surge protection circuit, an input overvoltage protection circuit, an input rapid overcurrent protection circuit and an input on-off control circuit;
one end of the input anti-surge protection circuit is connected with the anode of the high-voltage constant-current electric bus, and the other end of the input anti-surge protection circuit is grounded;
one end of the input overvoltage protection circuit is connected with the anode of the high-voltage constant-current power bus, and the other end of the input overvoltage protection circuit is grounded;
the input fast overcurrent protection circuit is connected between the high-voltage constant-current power supply and the main conversion unit in series and is grounded;
the input on-off control circuit is connected with the high-voltage constant-current power bus and used for controlling the power supply to be turned on and off.
3. The power supply for converting high-power high-voltage constant current input into constant voltage output according to claim 1, wherein the input anti-surge protection circuit comprises a TVS tube, an anti-detonator and a piezoresistor, and the TVS tube, the anti-detonator and the piezoresistor are connected in parallel.
4. The high power high voltage constant current input to constant voltage output power supply of claim 1, wherein the input overvoltage protection circuit comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switching tube MOS1, a voltage comparator U1 and a driver U2;
one end of the resistor R1 is connected with the anode of the high-voltage constant-current bus, and the other end of the resistor R1 is connected with the drain of the switching tube MOS 1;
one end of the resistor R2 is connected with the anode of the high-voltage constant-current bus, the other end of the resistor R2 is connected with the voltage input end of the voltage comparator U1 and is connected with one end of the resistor R3, and the other end of the resistor R3 is grounded;
the output end of the voltage comparator U1 is connected with the input end of a driver U2, the output end of the driver U2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the gate of a switching tube MOS 1;
the source of the switching tube MOS1 is grounded.
5. The power supply for converting high power high voltage constant current input into constant voltage output according to claim 1, wherein the input fast overcurrent protection circuit comprises: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a switching tube MOS2, a voltage comparator U3, a driver U4, a triode Q1 and a zener diode Z1;
one end of the resistor R6 is connected with the anode of the high-voltage constant-current bus, the other end of the resistor R5 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the drain electrode of the switching tube MOS 2;
an emitter of the triode Q1 is connected with one end of a resistor R6, and a base of the triode Q1 is connected with the other end of the resistor R6;
a collector of the triode Q1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with a voltage input end of a voltage comparator U3 and is connected with one end of a resistor R8, and the other end of the resistor R8 is grounded;
the output end of the voltage comparator U3 is connected with the input end of a driver U4, the output end of the driver U4 is connected with one end of a resistor R9, and the other end of the resistor R9 is connected with the gate of a switching tube MOS 2;
the source electrode of the switching tube MOS2 is grounded;
the zener diode Z1 is connected in parallel across the resistor R8.
6. The power supply for converting high-power high-voltage constant-current input into constant-voltage output according to claim 1, wherein the input switching control circuit comprises a resistor R10 and a relay K1;
the resistor R10 is connected in series with a normally closed contact of the relay K1, and a power supply driving end of the relay K1 is connected with the control unit.
7. A power supply for converting high-power high-voltage constant current input into constant voltage output according to any one of claims 1 to 6, wherein the main conversion unit comprises an inductor L1, a diode D1, a capacitor C1, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a switching tube MOS4, a switching tube MOS5, a switching tube MOS6, a driver U5, a driver U6 and a driver U7;
the control unit is respectively connected with the input ends of a driver U5, a driver U6 and a driver U7;
one ends of the resistor R11 and the resistor R13 are both connected with one end of an inductor L1, the other end of the inductor L1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded;
the other end of the resistor R11 is connected with the drain electrode of a switch tube MOS4, the output end of the driver U5 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with the gate electrode of a switch tube MOS4, and the source electrode of the switch tube MOS4 is grounded;
the other end of the resistor R13 is connected with the drain electrode of a switch tube MOS5, the output end of the driver U6 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with the gate electrode of a switch tube MOS5, and the source electrode of the switch tube MOS5 is grounded;
the drain electrode of the switching tube MOS6 is connected with the anode of the diode D1, the output end of the driver U7 is connected with one end of a resistor R15, the other end of the resistor R15 is connected with the grid electrode of the switching tube MOS6, and the source electrode of the switching tube MOS6 is grounded.
8. The method for controlling a power supply converting high-power high-voltage constant current input into constant voltage output according to claim 7, characterized by comprising the following steps:
charging the capacitor C1, and starting to enter a working state of discharging the capacitor C1 when the voltage at the two ends of the capacitor C1 is charged to a first voltage set value;
the control unit sends a PWM signal with a variable duty ratio to an input end of a driver U7, power amplification is carried out through a driver U7, a power driving signal is formed and sent to a resistor R15, the resistor R15 carries out current limiting and impedance matching on the power driving signal and then drives a switching tube MOS6, and the switching tube MOS6 carries out switching regulation according to the duty ratio of the PWM signal;
when the voltage at the two ends of the capacitor C1 is not lower than the second voltage set value and the input voltage is lower than a third voltage set value, closing the switching tube MOS 6;
the control unit controls the input end of the driver U5 to be at a high level, and after power amplification is carried out through the driver U5, a power driving signal is formed and sent to the resistor R12, and the resistor R12 drives the switching tube MOS4 to be conducted after carrying out current limiting and impedance matching on the power driving signal;
when the input voltage is reduced to a fourth voltage set value, the control unit controls the input end of the driver U6 to be at a high level, and after power amplification is carried out through the driver U6, a power driving signal is formed and sent to the resistor R14, and the resistor R14 drives the switching tube MOS5 to be conducted after current limiting and impedance matching are carried out on the power driving signal;
when the input voltage approaches the voltage which is the product of the equivalent resistance of the resistor R11 and the resistor R13 in parallel and the input constant current value, the control unit controls the switching tube MOS6 to be switched on and continues to reduce the input voltage to the voltage of 0V, and the continuous time is the time which is elapsed when the voltage at the two ends of the capacitor C1 is reduced to the second voltage set value;
when the voltage across the capacitor C1 drops to the second voltage set point, the charging of the capacitor C1 is performed, and then the charging and discharging processes of the capacitor C1 are continuously cycled.
9. The method for controlling a power supply converting high-power high-voltage constant current input into constant voltage output according to claim 8, further comprising a fault protection step;
comparing the acquired output voltage and output current of the output energy storage unit, the current of the high-voltage constant-current power supply, the input voltage and temperature data of the main conversion unit with the correspondingly set threshold, and controlling the main conversion unit and the input protection unit to carry out protection control when the input voltage and the temperature data exceed the correspondingly set threshold;
according to the process that a pilot passes through the switch tube MOS6, then the switch tube MOS4 is conducted, and finally the switch tube MOS5 is conducted, the input voltage is reduced, and then the relay of the input protection unit is controlled to be conducted;
sending corresponding fault data to an isolation communication unit, and reporting the fault data by the isolation communication unit;
and comparing the input voltage signal and the output voltage signal of the acquisition main conversion unit with the PID algorithm control value of the control unit respectively, and controlling the main conversion unit to carry out energy conversion.
10. A power supply system for converting high-power high-voltage constant current input into constant voltage output, which is characterized in that a plurality of power supplies for converting high-power high-voltage constant current input into constant voltage output according to any one of claims 1 to 7 are arranged, each power supply is provided with an isolated communication interface, the input of each power supply is connected in series, the communication interfaces are connected in parallel, the communication interfaces are communicated with each other and automatically designate a host computer and a slave computer, and redundant backup is completed.
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply for converting high-power high-voltage constant-current input into constant-voltage output and a control method thereof.
Background
In the field of current high-voltage power transmission and distribution, mature high-voltage alternating-current power transmission and distribution technologies, developed high-voltage direct-current constant-voltage power transmission and distribution technologies and immature high-voltage direct-current constant-current power transmission and distribution technologies which are recently developed exist. The high-voltage direct-current constant-current power transmission and distribution is particularly suitable for occasions with severe environments, the currents are almost the same on the whole power supply loop, and the terminal power taking equipment is stable in working state; the high-voltage direct-current constant-voltage power transmission and distribution are carried out on the whole power supply loop, the voltages are different, the near-end voltage is high, the far-end voltage is low, and the working state of the terminal power taking equipment is not easy to stabilize.
In the currently emerging field of submarine remote power supply, high-voltage direct-current constant-voltage power transmission and distribution and high-voltage direct-current constant-current power transmission and distribution are mainly available.
The high-voltage direct-current constant-current power transmission and distribution has advantages compared with the high-voltage direct-current constant-voltage power transmission and distribution.
1) The terminal electricity-taking equipment does not need a grounding terminal to take electricity, and the electrode of the grounding terminal is difficult to age in the seawater environment.
2) Under the condition of single-point grounding fault of a submarine cable caused by earthquake or other factors, the high-voltage direct-current constant-current power transmission and distribution network can still normally operate as seawater can provide a current loop, and only the voltage of a shore-based power supply is changed; and the high-voltage direct-current constant-voltage power transmission and distribution can stop running due to voltage breakdown of a power transmission and distribution network under the condition of submarine cable single-point ground faults caused by earthquakes or other factors.
3) The repeater and the splitter in the transoceanic communication system are supplied with power by constant currents, and can be directly used in series by adopting high-voltage direct-current constant-current power transmission and distribution, but if the repeater and the splitter are used by adopting high-voltage direct-current constant-voltage power transmission and distribution, the repeater and the splitter need to be changed to be suitable for a constant-voltage mode and used under the condition of large voltage change, and the repeater and the splitter cannot be directly matched and are not flexible to use.
Therefore, the research on the high-voltage direct-current constant-current power transmission and distribution technology is of great significance, and in the high-voltage direct-current constant-current power transmission and distribution technology, if the technology of converting high-voltage constant-current input into constant-voltage output is difficult in the high-voltage direct-current constant-current power transmission and distribution technology, and the technology of converting high-power high-voltage constant-current input into constant-voltage output is difficult in the difficult point, the research on the technology of converting high-power high-voltage constant-.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a power supply for converting high-power high-voltage constant-current input into constant-voltage output and a control method thereof. The invention adopts the self-adaptive cycle adjustment, can automatically adjust the working cycle according to the size of the equivalent capacitor of different input high-voltage constant-current power, is very suitable for the input occasion with very large equivalent capacitor of the input high-voltage constant-current power, and has the advantages of less loss and very high efficiency compared with the scheme of the traditional high-frequency constant-frequency PWM adjusting method, and the efficiency can reach more than 97 percent generally; compared with the application of single-cable constant-voltage power supply, the single-cable high-voltage constant-current power supply does not need to be connected with an additional grounding electrode, and when the single-cable high-voltage constant-current power supply is applied to complicated occasions such as deep sea, the service life is obviously prolonged, and the maintenance cost is obviously reduced because the problem of grounding electrode aging is avoided; the output power of the single module is improved, the problem that the output power of the traditional scheme is not large is solved, and the application range is wide.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a power supply for converting high-power high-voltage constant-current input into constant-voltage output, which comprises:
the device comprises an input protection unit, a main conversion unit, an output energy storage unit, an auxiliary power supply unit, a control unit, a sampling unit and an isolation communication unit;
the input end of the input protection unit is connected with a high-voltage constant-current power supply, the output end of the input protection unit is connected with the input end of the main conversion unit, the output end of the main conversion unit is connected with the output energy storage unit, the main conversion unit is used for converting the high-voltage constant-current input into a constant-voltage output, and the output energy storage unit is provided with an energy storage capacitor and is used for storing energy and outputting the energy at a constant voltage;
the input end of the auxiliary power supply unit is connected with the high-voltage constant-current bus and the output energy storage unit and is used for taking electricity from the high-voltage constant-current bus and taking electricity from the output energy storage unit;
the output end of the auxiliary power supply unit is connected with the control unit;
the control unit comprises an ADC chip circuit, a single chip circuit and a voltage conversion chip circuit;
the ADC chip circuit is used for converting an analog signal of data collected by the sampling unit into a digital signal and then sending the digital signal to the single chip microcomputer circuit, the single chip microcomputer circuit is used for judging whether the data collected by the sampling unit exceeds a set threshold value, and the voltage conversion chip circuit is used for converting the power supply voltage of the control unit;
the sampling unit is respectively connected with the high-voltage constant-current power supply, the main conversion unit and the output energy storage unit and is used for collecting output voltage and output current of the output energy storage unit, current of the high-voltage constant-current power supply, and input voltage and temperature data of the main conversion unit;
the isolation communication unit is provided with an isolated communication circuit and is used for carrying out isolated communication transmission on the data of the control unit.
As a preferred technical scheme, the input protection unit comprises an input anti-surge protection circuit, an input overvoltage protection circuit, an input rapid overcurrent protection circuit and an input on-off control circuit;
one end of the input anti-surge protection circuit is connected with the anode of the high-voltage constant-current electric bus, and the other end of the input anti-surge protection circuit is grounded;
one end of the input overvoltage protection circuit is connected with the anode of the high-voltage constant-current power bus, and the other end of the input overvoltage protection circuit is grounded;
the input fast overcurrent protection circuit is connected between the high-voltage constant-current power supply and the main conversion unit in series and is grounded;
the input on-off control circuit is connected with the high-voltage constant-current power bus and used for controlling the power supply to be turned on and off.
As a preferred technical scheme, the input anti-surge protection circuit comprises a TVS tube, an anti-detonator and a piezoresistor, wherein the TVS tube, the anti-detonator and the piezoresistor are connected in parallel.
As a preferred technical solution, the input overvoltage protection circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switching tube MOS1, a voltage comparator U1 and a driver U2;
one end of the resistor R1 is connected with the anode of the high-voltage constant-current bus, and the other end of the resistor R1 is connected with the drain of the switching tube MOS 1;
one end of the resistor R2 is connected with the anode of the high-voltage constant-current bus, the other end of the resistor R2 is connected with the voltage input end of the voltage comparator U1 and is connected with one end of the resistor R3, and the other end of the resistor R3 is grounded;
the output end of the voltage comparator U1 is connected with the input end of a driver U2, the output end of the driver U2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the gate of a switching tube MOS 1;
the source of the switching tube MOS1 is grounded.
As a preferred technical solution, the input fast overcurrent protection circuit includes: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a switching tube MOS2, a voltage comparator U3, a driver U4, a triode Q1 and a zener diode Z1;
one end of the resistor R6 is connected with the anode of the high-voltage constant-current bus, the other end of the resistor R5 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the drain electrode of the switching tube MOS 2;
an emitter of the triode Q1 is connected with one end of a resistor R6, and a base of the triode Q1 is connected with the other end of the resistor R6;
a collector of the triode Q1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with a voltage input end of a voltage comparator U3 and is connected with one end of a resistor R8, and the other end of the resistor R8 is grounded;
the output end of the voltage comparator U3 is connected with the input end of a driver U4, the output end of the driver U4 is connected with one end of a resistor R9, and the other end of the resistor R9 is connected with the gate of a switching tube MOS 2;
the source electrode of the switching tube MOS2 is grounded;
the zener diode Z1 is connected in parallel across the resistor R8.
As a preferable technical solution, the input switching on/off control circuit includes a resistor R10 and a relay K1;
the resistor R10 is connected in series with a normally closed contact of the relay K1, and a power supply driving end of the relay K1 is connected with the control unit.
As a preferable technical solution, the main conversion unit includes an inductor L1, a diode D1, a capacitor C1, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a switching transistor MOS4, a switching transistor MOS5, a switching transistor MOS6, a driver U5, a driver U6, and a driver U7;
the control unit is respectively connected with the input ends of a driver U5, a driver U6 and a driver U7;
one ends of the resistor R11 and the resistor R13 are both connected with one end of an inductor L1, the other end of the inductor L1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded;
the other end of the resistor R11 is connected with the drain electrode of a switch tube MOS4, the output end of the driver U5 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with the gate electrode of a switch tube MOS4, and the source electrode of the switch tube MOS4 is grounded;
the other end of the resistor R13 is connected with the drain electrode of a switch tube MOS5, the output end of the driver U6 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with the gate electrode of a switch tube MOS5, and the source electrode of the switch tube MOS5 is grounded;
the drain electrode of the switching tube MOS6 is connected with the anode of the diode D1, the output end of the driver U7 is connected with one end of a resistor R15, the other end of the resistor R15 is connected with the grid electrode of the switching tube MOS6, and the source electrode of the switching tube MOS6 is grounded.
The invention also provides a control method for converting high-power high-voltage constant-current input into constant-voltage output, which comprises the following steps:
charging the capacitor C1, and starting to enter a working state of discharging the capacitor C1 when the voltage at the two ends of the capacitor C1 is charged to a first voltage set value;
the control unit sends a PWM signal with a variable duty ratio to an input end of a driver U7, power amplification is carried out through a driver U7, a power driving signal is formed and sent to a resistor R15, the resistor R15 carries out current limiting and impedance matching on the power driving signal and then drives a switching tube MOS6, and the switching tube MOS6 carries out switching regulation according to the duty ratio of the PWM signal;
when the voltage at the two ends of the capacitor C1 is not lower than the second voltage set value and the input voltage is lower than a third voltage set value, closing the switching tube MOS 6;
the control unit controls the input end of the driver U5 to be at a high level, and after power amplification is carried out through the driver U5, a power driving signal is formed and sent to the resistor R12, and the resistor R12 drives the switching tube MOS4 to be conducted after carrying out current limiting and impedance matching on the power driving signal;
when the input voltage is reduced to a fourth voltage set value, the control unit controls the input end of the driver U6 to be at a high level, and after power amplification is carried out through the driver U6, a power driving signal is formed and sent to the resistor R14, and the resistor R14 drives the switching tube MOS5 to be conducted after current limiting and impedance matching are carried out on the power driving signal;
when the input voltage approaches the voltage which is the product of the equivalent resistance of the resistor R11 and the resistor R13 in parallel and the input constant current value, the control unit controls the switching tube MOS6 to be switched on and continues to reduce the input voltage to the voltage of 0V, and the continuous time is the time which is elapsed when the voltage at the two ends of the capacitor C1 is reduced to the second voltage set value;
when the voltage across the capacitor C1 drops to the second voltage set point, the charging of the capacitor C1 is performed, and then the charging and discharging processes of the capacitor C1 are continuously cycled.
As a preferred technical scheme, the method also comprises a fault protection step;
comparing the acquired output voltage and output current of the output energy storage unit, the current of the high-voltage constant-current power supply, the input voltage and temperature data of the main conversion unit with the correspondingly set threshold, and controlling the main conversion unit and the input protection unit to carry out protection control when the input voltage and the temperature data exceed the correspondingly set threshold;
according to the process that a pilot passes through the switch tube MOS6, then the switch tube MOS4 is conducted, and finally the switch tube MOS5 is conducted, the input voltage is reduced, and then the relay of the input protection unit is controlled to be conducted;
sending corresponding fault data to an isolation communication unit, and reporting the fault data by the isolation communication unit;
and comparing the input voltage signal and the output voltage signal of the acquisition main conversion unit with the PID algorithm control value of the control unit respectively, and controlling the main conversion unit to carry out energy conversion.
The invention also provides a power supply system for converting high-power high-voltage constant current input into constant voltage output, which is provided with a plurality of power supplies for converting high-power high-voltage constant current input into constant voltage output, each power supply is provided with an isolated communication interface, the input of each power supply is connected in series, the communication interfaces are connected in parallel, the communication interfaces are communicated with each other and automatically designate a host computer and a slave computer, and the redundancy backup is completed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts the self-adaptive period adjustment, can automatically adjust the working period according to the sizes of equivalent capacitors of different input high-voltage constant-current power, automatically increases the working period if the equivalent capacitor of the input high-voltage constant-current power is very large, so that the working period in unit time is reduced, the loss caused by the discharge of the equivalent capacitor of the input high-voltage constant-current power in unit time is also reduced, and the invention is very suitable for the input occasions with very large equivalent capacitors of the input high-voltage constant-current power, compared with the scheme of the traditional high-frequency constant-frequency PWM adjusting method, the loss is very little, the efficiency is very high, the efficiency can reach more than 97 percent generally, and the scheme of the traditional high-frequency constant-frequency PWM adjusting method can be effectively replaced.
(2) The invention adopts the single chip as the control core, has flexible PID algorithm, can run different PID algorithms at different stages, better matches the whole working process, solves the limitation that only one working method and fixed algorithm are used by a hard main control chip, is very suitable for the occasion of self-adaptive periodic adjustment, achieves the algorithm optimization of the whole working process and improves the reliability. The singlechip is used as a control core, the protection function is processed by the singlechip, the protection logic is more flexible and perfect, and the device is very suitable for being used in a constant-current high-voltage power supply system with a complex use environment.
(3) Compared with the application of single-cable constant-voltage power supply, the invention adopts single-cable high-voltage constant-current power supply, does not need to connect an additional grounding electrode, and obviously prolongs the service life and obviously reduces the maintenance cost because the problem of grounding electrode aging is avoided when the invention is applied to complicated occasions such as deep sea and the like.
(4) The invention adopts single-cable high-voltage constant-current power supply, is connected in series with a power supply cable, can realize full sealing on a mechanical structure, can realize full isolation from the external environment on an electrical structure, thereby forming an independent and stable power-taking environment, has working voltage in the power supply as the working voltage range of normal operation of the power supply, and has nothing to do with the total voltage of the whole high-voltage constant-current power supply, has the working voltage of a device at the input side of the power supply as conventional voltage, has the highest voltage not more than 1000V, can directly use a mature and reliable 1200V-level semiconductor device, does not need to carry out measures such as device series connection and the like, and obviously improves the reliability of the whole machine; and because the electrical structure is completely isolated from the external environment, the cable can be directly used on the cable at any position of the whole high-voltage constant-current power supply system, can realize the same performance, and is irrelevant to the external environment.
(5) The input power of the single module power supply can reach 1000V to the maximum and is multiplied by the constant current value of the constant current bus, the output power can reach 97 percent of the input power to the maximum, and compared with a scheme of PWM duty ratio regulation and a scheme of excessive power consumption of a simulation load, the single module power supply obviously improves the output power of the single module, solves the problem that the output power of the traditional scheme is not large, and further expands the use occasions of products.
(6) The power supply of the invention is easy to expand power, can directly use the input of a plurality of module power supplies to carry out series connection, the communication interfaces are directly connected in parallel, and the output is respectively connected with a load or a switch power supply to expand the power level, thereby forming the power supply complete machine with ultrahigh power, and being conveniently used in various occasions.
Drawings
FIG. 1 is a block diagram of a power supply with high-power high-voltage constant-current input to constant-voltage output according to the present embodiment;
FIG. 2 is a schematic structural diagram of an input protection unit according to the present embodiment;
FIG. 3 is a schematic diagram of an input over-voltage protection circuit according to the present embodiment;
fig. 4 is a schematic structural diagram of the input fast overcurrent protection circuit according to the embodiment;
fig. 5 is a schematic structural diagram of an input switch control circuit according to the present embodiment;
FIG. 6 is a schematic circuit diagram of a main converting unit according to the present embodiment;
fig. 7 is a schematic structural diagram of the high-power multi-module backup redundancy in this embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1, the present embodiment provides a power supply for converting a high-power high-voltage constant current input into a constant voltage output, where the power supply for converting a high-power high-voltage constant current input into a constant voltage output is connected in series to an input line, and includes an input protection unit, a main conversion unit, an output energy storage unit, an auxiliary power supply unit, a control unit, a sampling unit, and an isolation communication unit, which are connected in sequence;
the power supply of the embodiment has the input of constant current of 1.5A and below 1000V, the output of constant voltage of about 800V and the output of maximum power of 1200W;
the high-voltage constant current flows into the main conversion unit from the input protection unit and flows out from the auxiliary power supply unit, meanwhile, the main conversion unit converts the high-voltage constant current into constant voltage and then sends the constant voltage to the output energy storage unit for energy storage and then directly output to a client system or output to various isolation DC-DC of a later stage for use, and the isolation DC-DC is sent to the client system for use. The auxiliary power supply unit directly takes power from the high-voltage constant-current bus and the output energy storage unit, takes power from 2 places, and mainly aims at redundancy backup and reliability of auxiliary power. And the power supply is converted into various isolated auxiliary power for the control unit to use through the isolating switch power supply. The sampling unit collects the output voltage of the output energy storage unit, the output current of the output energy storage unit, the current of the high-voltage constant-current power, the input voltage of the main conversion unit and the temperature data and then sends the data to the control unit. The control unit receives the data of the sampling unit and the data of the isolation communication unit, then carries out analysis processing, compares a current signal of high-voltage constant current with an overcurrent set value of the control unit, controls the main conversion unit and the input protection unit to protect when overcurrent and undercurrent pass through, firstly controls the main conversion unit to conduct MOS6 according to a program, then conducts MOS4, then conducts MOS5 to reduce input voltage according to a flow, then controls the relay of the input protection unit to conduct, inputs short circuit, enables all input current to flow through the relay to protect a rear-stage circuit, and sends input slow overcurrent and undercurrent passing fault data to the isolation communication unit, and reports the fault data isolated from a client system through the isolation communication unit; comparing an input voltage signal of the acquisition main conversion unit with an overvoltage set value of the control unit, controlling the main conversion unit and the input protection unit to protect during overvoltage, firstly controlling the main conversion unit to firstly conduct MOS6 according to a program, then conducting MOS4, then conducting MOS5 to reduce the input voltage according to a flow, then controlling a relay of the input protection unit to conduct, inputting in a short circuit mode, enabling all input currents to flow through the relay to protect a rear-stage circuit, sending corresponding input overvoltage fault data to the isolation communication unit, and reporting fault data isolated from a client system through the isolation communication unit; comparing the temperature data of the collected main conversion unit with the over-temperature set value of the control unit, controlling the main conversion unit and the input protection unit to protect when the temperature is over-temperature, firstly controlling the main conversion unit to firstly conduct the MOS6 according to a program, then conducting the MOS4, then conducting the MOS5 to reduce the input voltage according to a flow, then controlling the relay of the input protection unit to conduct, inputting in a short circuit manner, enabling all input current to flow through the relay so as to protect a rear-stage circuit, sending over-temperature fault data to the isolation communication unit, and reporting the fault data isolated from a client system through the isolation communication unit; comparing an output current signal of the acquisition main conversion unit with an output overcurrent set value of the control unit, when overcurrent occurs, determining that a fault occurs at a load end, then controlling the main conversion unit and the input protection unit to protect, firstly controlling the main conversion unit to firstly conduct MOS6 according to a program, then conducting MOS4, then conducting MOS5 to reduce input voltage according to a flow, then controlling a relay of the input protection unit to conduct, inputting in a short circuit, enabling all input current to flow through the relay to protect a rear-stage circuit, sending output overcurrent fault data to the isolation communication unit, and reporting the fault data isolated from a client system through the isolation communication unit; comparing an output voltage signal of the acquisition main conversion unit with an output over-voltage and under-voltage set value of the control unit, when the voltage is over-voltage and under-voltage, considering that a load end has a fault, then controlling the main conversion unit and the input protection unit to protect, firstly controlling the main conversion unit to firstly switch on an MOS6 according to a program, then switching on an MOS4, then switching on an MOS5 to reduce the input voltage according to a flow, then controlling a relay of the input protection unit to switch on, inputting in a short circuit, enabling all input current to flow through the relay to protect a rear-stage circuit, sending output over-voltage and under-voltage fault data to the isolation communication unit, and reporting the fault data isolated from a client system through the isolation communication unit; the input voltage signal and the output voltage signal of the acquisition main conversion unit are compared with the PID algorithm control value of the control unit, the main conversion circuit is controlled to perform energy conversion, and the detailed working process is described in detail in the main conversion unit.
As shown in fig. 2, the input protection unit includes an input anti-surge protection circuit, an input overvoltage protection circuit, an input fast overcurrent protection circuit, and an input on-off control circuit, and is controlled by the control unit, and performs various protections on the input high-voltage constant-current, and then the input high-voltage constant-current is sent to the main conversion unit for use.
IN this embodiment, the input anti-surge protection circuit includes a TVS tube, an anti-detonator, and a varistor, and the TVS tube, the anti-detonator, and the varistor are connected IN parallel to the IN + bus and the GND bus, that is, one end of each of these elements is connected to the IN + bus, and the other end is connected to the GND bus, and the high-voltage and ultra-short-time voltage spike and the input surge are absorbed by the TVS tube, the anti-detonator, and the varistor to protect the subsequent circuit.
As shown in fig. 3, the input overvoltage protection circuit includes resistors R1 to R4, a switching transistor MOS1, a voltage comparator U1, and a driver U2; when the input voltage exceeds the overvoltage protection value, the voltage between the resistors R2 and R3 exceeds the voltage of REF, the voltage comparator U1 outputs high level to the driver U2, the driver U2 performs power amplification on the high level signal to form a power driving signal and sends the power driving signal to the resistor R4, the resistor R4 performs current limiting and impedance matching on the power driving signal and then drives the switch tube MOS1, so that the switch tube MOS1 is conducted, the input energy is released through the resistor R1 and the switch tube MOS1, the input voltage is limited, and the rear-stage circuit is protected. The input overvoltage protection circuit is a quick protection circuit, is formed by all hardware, has high reliability, effectively absorbs voltage spikes for a long time and protects a rear-stage circuit. The whole machine is also provided with a first-stage overvoltage protection controlled by the control unit, and the overvoltage protection is input for long time through the control unit to protect and shut down the machine.
As shown in fig. 4, the input fast overcurrent protection circuit includes resistors R5 to R9, a switching transistor MOS2, a voltage comparator U3, a driver U4, a transistor Q1, and a zener diode Z1, when an input current spike exceeds an overcurrent protection value, a voltage difference across the resistor R6 turns on the transistor Q1, when the transistor Q1 turns on, a voltage between the resistors R7 and R8 exceeds a voltage of REF, the voltage comparator U3 outputs a high level to the driver U4, the driver U4 performs power amplification on the high level signal to form a power driving signal, the power driving signal is sent to the resistor R9, the resistor R9 performs current limiting and impedance matching on the power driving signal to drive the switching transistor MOS2, thereby turning on the switching transistor MOS2, releasing input energy through the resistor R5, the resistor R6, and the switching transistor MOS1, thereby limiting the input voltage, and allowing all current to flow through the resistor R5, the resistor R6, and the switching transistor MOS 8672, thereby protecting the post-stage circuit. The zener diode Z1 limits the voltage across the resistors R7 and R8 to not exceed the input of the voltage comparator U3, thereby protecting the voltage comparator U3. The input fast overcurrent protection circuit is a fast protection circuit, is formed by all hardware, has high reliability, and effectively flows all current spikes through the resistor R5, the resistor R6 and the switching tube MOS1, thereby protecting a rear-stage circuit. The whole machine is also provided with a first-stage input over-under-current protection controlled by the control unit, and long-time over-under-current is protected by the input slow over-under-current protection controlled by the control unit and is shut down.
As shown in fig. 5, the input switch control circuit includes a resistor R10 and a relay K1, when the power supply is just powered, the auxiliary power is not established, the control unit is not powered, the relay K1 is turned on through a normally closed contact, and the input is bypassed through the resistor R10 and the relay K1, so that the rear-stage circuit is not powered. When the auxiliary power is established, the control unit judges the working state, and when the power supply is to be started, the relay K1 contact is disconnected by controlling the ON/OFF pin, the rear-stage circuit is electrified, and the power supply starts to be started. When the power supply is shut down, the control unit controls the ON/OFF pin to conduct the contact of the relay K1, bypass input is carried out, the rear-stage circuit is not electrified, and the power supply is shut down.
As shown in fig. 6, the main conversion unit includes resistors R11 to R15, switching transistors MOS4 to MOS6, drivers U5 to U7, an inductor L1, a diode D1, and a capacitor C1. The main conversion unit converts the high-voltage constant current electricity into constant voltage electricity to be used by the output energy storage unit; when the capacitor C1 is charged with a constant current by high-voltage constant current, the current flows from I-1 to the inductor L1, the diode D1 and the capacitor C1 and then flows back to GND; when the capacitor C1 discharges, the input high-voltage constant-current is divided into high-frequency current 2 parts, one part of the high-frequency current flows from I-1 to the inductor L1, the diode D1 and the capacitor C1 and then flows back to GND, and the other part of the high-frequency current flows from I-1 to the inductor L1 and the switching tube MOS6 and then flows back to GND; after a period of time, the MOS6 is closed, the MOS4 is turned on, and the current flows from the I-1 to the resistor R11 and the switch tube MOS4 and then flows back to GND; after a period of time, the MOS5 is turned on, part of the current flows from the I-1 to the resistor R11 and the switching tube MOS4 and then flows to the GND, and part of the current flows from the I-1 to the resistor R13 and the switching tube MOS5 and then flows to the GND. During the whole work period, the current of the input high-voltage constant current is constant, the voltage is changed, the capacitor C1 is charged and discharged regularly, and the voltage on the C1 also rises and falls regularly and is kept in a certain range. During the charging state of the capacitor C1, the sampling unit samples all signals and sends the signals to the control unit for analysis and operation, when a fault exists, the protection process program is entered for processing, if no fault exists, when VO + on the capacitor C1 charges the voltage of GND to 830V, the working state of capacitor C1 discharge is started, the control unit sends PWM signals with variable duty ratio to GATE3 and carries out power amplification through a driver U7, power driving signals are formed and sent to a resistor R15, the resistor R15 carries out current limiting and impedance matching on the power driving signals and then drives a switching tube MOS6, the switching tube MOS6 carries out switching regulation according to the duty ratio of the PWM signals from small to large, and therefore input equivalent capacitors (mainly including the capacitor C1) are input (mainlyThe equivalent capacitance on the input port, the equivalent capacitance of the output capacitance of the power supply system, the equivalent capacitance of the transmission line, the equivalent capacitance of the input protection circuit, etc.) is isolated by the inductor L1 and the diode D1 and then sent to the C1, meanwhile, the equivalent impedance between I-1 and GND is continuously reduced due to the continuously increased turn-on duty ratio of the MOS6, so that the voltage of the input high-voltage constant current is soft-regulated from high to low, only a small part of energy (power loss of the inductor L1, the diode D1, the MOS6 of the switching tube, the line impedance, etc.) is lost, the conversion efficiency is very high, meanwhile, the sampling unit samples all signals and sends the signals to the control unit for analysis and operation, if there is a fault, the fault processing flow is entered, if there is no fault, when the output voltage (the voltage on the C1) of the main conversion unit is not lower than 770V, and the input voltage (the voltage between I-, closing the switching tube MOS 6; then the control unit controls GATE1 to be high level and performs power amplification through a driver U5 to form a power driving signal and sends the power driving signal to a resistor R12, the resistor R12 performs current limiting and impedance matching on the power driving signal and then drives a switching tube MOS4 to be conducted, so that the input current flows from I-1 to a resistor R11 and a switching tube MOS4 and then flows back to GND, the energy input into an equivalent capacitor is consumed on a resistor R11, and the resistor R11 selects a proper lower resistance value (such as 20 ohms) so that the voltage between the input I-1 and the GND is rapidly and continuously reduced, and the energy is 0.5CU because the input voltage is already less than 80V at the moment2Because the voltage U is smaller, the energy is less, so the energy consumption of the input equivalent capacitor is not much, and the overall efficiency loss is less; when the input voltage is further reduced to 40V voltage, the GATE2 is controlled to be high level by the control unit and power amplification is carried out through the driver U6, a power driving signal is formed and sent to the resistor R14, the resistor R14 drives the switching tube MOS5 to be conducted after current limiting and impedance matching are carried out on the power driving signal, so that part of the input current flows from I-1 to the resistor R11 and the switching tube MOS4 and flows back to GND, meanwhile, part of the input current flows from I-1 to the resistor R13 and the switching tube MOS5 and flows back to GND, the resistor R13 selects a lower resistance value (such as 2 ohms) than R11, so that the input voltage is further reduced rapidly, and the energy is 0.5CU at the moment because the input voltage is already very low (less than 40V), and the energy is 0.5CU2Due to the fact thatThe voltage U is very small, so the energy is very little, the energy consumption on the input equivalent capacitor is very little, and the overall efficiency loss is very little; when the input voltage approaches the product voltage of the equivalent resistance of the resistor R11 in parallel with the resistor R13 and the input constant current value (e.g. 3.5V), the control unit controls the switching transistor MOS6 to be always turned on, so as to reduce the input voltage to a voltage of almost 0V for a period of time, wherein the period of time depends on the time elapsed when the output voltage is reduced to 770V. When the output voltage drops to 770V, the charging operation module of the output capacitor C1 is started, and then the cycle is continuously repeated. The working process can know that the time of the whole working period is not constant, and the method is an adaptive period regulation control method (PID core algorithm of the power supply).
The control method has the advantages that the self-adaptive period adjustment is realized, the working period can be automatically adjusted according to the sizes of equivalent capacitors of different input high-voltage constant-current power, if the equivalent capacitor of the input high-voltage constant-current power is very large, the working period is automatically increased, the working period number in unit time is reduced, the loss caused by the discharge of the equivalent capacitor of the input high-voltage constant-current power in unit time is also reduced, the control method is very suitable for the input occasions with very large equivalent capacitors of the input high-voltage constant-current power, compared with the traditional scheme of a high-frequency constant-frequency PWM adjusting method, the loss is very little, the efficiency is very high, the efficiency can reach more than 97 percent generally, and the scheme of the traditional high-frequency constant-frequency PWM.
In this embodiment, the output energy storage unit is composed of a plurality of high-voltage capacitors, and stores energy at the output of the main conversion unit, and a high-voltage capacitor with a suitable total capacity is selected according to a formula 0.5C (U)1 2-U2 2)＝POT, wherein U1Is 770V, U2Is 700V, POThe value of 1200W, t is 50mS, C can be calculated to be larger than 1166 muF, 20% tolerance of capacitor is obtained, therefore, the capacitance of 1400 muF can be selected to meet the power-down requirement of input power-down time of 50mS, the output of the main conversion unit can be further filtered, and very clean constant-voltage direct current output is obtained.
In this embodiment, the sampling unit is composed of a plurality of sampling circuits, wherein the sampling circuits collect output voltage of the output energy storage unit, collect output current of the output energy storage unit in an isolated manner, collect current of input high-voltage constant-current electricity in an isolated manner, and collect input voltage and temperature signals of the main conversion unit and then send the signals to the control unit. The output voltage of the output energy storage unit and the input voltage acquisition circuit of the main conversion unit adopt a scheme of adding operational amplifier following by a resistance voltage division method, the output current of the output energy storage unit and the input high-voltage constant-current acquisition circuit adopt a scheme of isolating Hall device sampling and then adding operational amplifier following, and the temperature acquisition circuit adopts a scheme of NTC and resistance voltage division adding operational amplifier following.
In the embodiment, the isolated communication unit is composed of an isolated communication circuit and carries out isolated communication transmission on the data of the control unit and the data of the client system.
In this embodiment, the control unit mainly includes a single chip circuit, an ADC chip circuit, a voltage conversion chip circuit, and a peripheral circuit, where the ADC chip circuit converts various analog signals collected by the sampling unit into digital signals and sends the digital signals to the single chip circuit. The voltage conversion chip circuit converts the power supply sent by the auxiliary power supply unit into a low-voltage power supply suitable for various circuits. The peripheral circuit is composed of various devices and is mainly matched with the control unit to realize the function.
The single chip circuit is the core technology of the control unit, and a control algorithm is added in a single chip program. A PID core control algorithm is specially designed according to the conversion steps of the main conversion circuit, the high-efficiency and reliable work of the main conversion circuit can be well realized, and the specific working process is detailed in the analysis of the working principle of the main circuit. The single chip circuit analyzes the fault information and the communication data, if the host computer receives the starting command and the host computer is allowed to start without fault, if the host computer has fault, the host computer is shut down and reports the fault, and if the host computer receives the shutdown command, the host computer is shut down. The single chip circuit judges an input current signal to realize the functions of inputting a slow overcurrent protection function and inputting a slow undercurrent protection function; the single chip circuit judges an input voltage signal to realize the input overvoltage protection function; the single chip circuit judges an output voltage signal to realize the functions of outputting overvoltage protection and outputting undervoltage protection; the singlechip circuit judges an output current signal to realize the output overcurrent protection function; the single chip circuit judges a temperature signal to realize an over-temperature protection function; the singlechip circuit judges the communication signal and realizes the communication fault protection function.
The perfect function and protection measures of the control unit effectively ensure the reliable operation of the whole power supply.
As shown in fig. 7, the whole power supply can also be combined with a plurality of same power supplies to form a large power supply system, and the power supplies communicate with each other and automatically designate a master and a slave through an isolated communication interface, so that high-power conversion and backup redundancy functions of N +1, 1+1 and the like are realized.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.