阅读说明：本技术 一种隔离型多路输出电源电路 (Isolated form multiplexed output power supply circuit ) 是由 崔勇 杜文韬 陈怀技 张辉 李华清 吴军军 李娟� 于 2020-07-03 设计创作，主要内容包括：本发明揭示了一种隔离型多路输出电源电路,脉冲恒流源的脉冲电流输出端依次将多个隔离变压器的初级串联,每个所述隔离变压器的次级设有三路输出,分别连接三路整流滤波电路构成三路独立的电源输出。本发明隔离型多路输出电源以及电压调节与限制有效地解决了系统的高压隔离以及多路输出电压不一致不独立调以等问题,并且优化了电源的体积和重量,降低了成本,满足高压固态调制器与高压固态脉冲电源系统小型化的发展需求,此外,电路简单可靠,使用简单的元器件构成了隔离多路输出电源的电压限制与调节,避免了复杂调节电路带来的干扰问题,同时因隔离变器输出电压可限可调,降低了对隔离变压器的设计与制作要求。(The invention discloses an isolated multi-output power supply circuit.A pulse current output end of a pulse constant current source sequentially connects the primary sides of a plurality of isolation transformers in series, and the secondary side of each isolation transformer is provided with three outputs which are respectively connected with three rectifying and filtering circuits to form three independent power supply outputs. The isolated multi-output power supply and the voltage regulation and limitation effectively solve the problems of high-voltage isolation of the system, inconsistent and non-independent regulation of multi-output voltage and the like, optimize the volume and weight of the power supply, reduce the cost, meet the development requirement of miniaturization of a high-voltage solid-state modulator and a high-voltage solid-state pulse power supply system, have simple and reliable circuits, use simple components to form the voltage limitation and regulation of the isolated multi-output power supply, avoid the interference problem caused by a complex regulation circuit, and reduce the design and manufacturing requirements of an isolation transformer because the output voltage of the isolation transformer can be limited and regulated.)

1. An isolated multi-output power circuit is characterized in that: the pulse current output end of the pulse constant current source sequentially connects the primary sides of a plurality of isolation transformers in series, the secondary side of each isolation transformer is provided with three outputs, and the three outputs are respectively connected with three rectifying and filtering circuits to form three independent power outputs.

2. The isolated multi-output power supply circuit of claim 1, wherein: the output pin 1 and the output pin 2 of each isolation transformer are a group of voltage and are connected with the input end of a first bridge rectifier, a capacitor for filtering is connected between the two output ends of the first bridge rectifier, and the two output ends of the first bridge rectifier are respectively used as the positive pole and the negative pole of a direct-current power supply to form direct-current voltage DC _ 1.

3. The isolated multi-output power supply circuit of claim 1, wherein: and 3 pins and 4 pins of the output of each isolation transformer are a group of voltage connected with the input end of a second bridge rectifier, a capacitor for filtering is connected between two output ends of the second bridge rectifier, and the two output ends of the second bridge rectifier are respectively used as the positive pole and the negative pole of a direct-current power supply to form direct-current voltage DC _ 2.

4. The isolated multi-output power supply circuit of claim 1, wherein: the output 5 pin and the output 6 pin of each isolation transformer are a group of voltage and are connected with the input end of a third bridge rectifier, a capacitor and a voltage-stabilizing tube which are arranged in parallel are connected between two output ends of the third bridge rectifier, the positive output end of the third bridge rectifier passes through the input end of a three-terminal integrated voltage-stabilizing tube, the grounding end of the three-terminal integrated voltage-stabilizing tube is connected with the negative output end of the third bridge rectifier, a potentiometer is connected between the output end of the three-terminal integrated voltage-stabilizing tube and the negative output end of the third bridge rectifier, and the positive output end and the negative output end of the third bridge rectifier form direct-current voltage DC _ 3.

5. The isolated multi-output power supply circuit of claim 1, wherein: the voltage limiting function of DC _1, DC _2 and DC _3 in the claims 2 to 4 is formed by connecting a DC _3 end of the output direct current voltage of the claim 4 with a voltage stabilizing tube, the output end of the three-end integrated voltage stabilizing tube is used as a 5V direct current power supply to output, and meanwhile, a potentiometer is connected to the positive electrode and the negative electrode, so that the voltage regulating function of DC _1, DC _2 and DC _3 in the claims 2 to 4 is realized.

Technical Field

The invention relates to the technical field of pulse power electronics and switching power supplies, in particular to an isolated multi-output power supply and a voltage regulation and limiting method.

Background

With the continuous update and rapid development of switching power supply technology, and the miniaturization, high frequency and high reliability of high-power semiconductor devices, high-voltage pulse power technology has been widely applied in a plurality of fields such as accelerators, radar transmitters, safety inspection, industrial nondestructive inspection and the like, high-voltage solid-state modulators and high-voltage solid-state pulse power supplies are increasingly applied, but due to the voltage resistance problem of semiconductor devices, wherein the high-voltage solid-state switches still need to be applied by connecting a plurality of IGBTs, MOFETs and the like in series, so that an isolated multi-path output power supply is needed to supply power to each solid-state switch, and high-voltage potentials of dozens of kilovolts or even hundreds of kilovolts exist among different output power supplies, and because the working potential of a low-voltage pulse constant-current power supply is suspended, high-voltage and low-.

The most common isolation measure is to choose an isolation transformer. The high and low of the isolation potential puts higher requirements on the isolation transformer, and directly influences factors such as the structure, the volume and the like of the transformer. Indexes such as space distance, medium characteristics and the like directly influence the pressure resistance degree of the high-voltage equipment, and the selection of an isolation scheme directly influences factors such as the volume, the weight, the cost and the like of the high-voltage equipment. The traditional high-voltage potential isolation adopts a power frequency signal isolation power supply mode, a power frequency power supply signal is suspended on a high voltage through an isolation transformer, and the output of a constant current power supply is realized at a high-voltage end. The isolation mode has the advantages of high isolation voltage level, huge volume, heavy weight and high cost of the power frequency isolation transformer. In addition, due to the low transmission efficiency of the power frequency isolation transformer, each isolated output constant current power supply is easily affected by loads, output voltages have large difference, the requirement on withstand voltage of the isolated output power supply is high, and the on-off consistency of the solid-state switches is poor due to the large difference of the output voltages, so that the design margin of the solid-state switches is increased, and even the solid-state switches are damaged.

Disclosure of Invention

The invention aims to solve the technical problem of realizing a circuit for supplying power to the isolation transformers of each isolated multi-output power supply by using a high-frequency pulse constant current source as a power supply.

In order to achieve the purpose, the invention adopts the technical scheme that: the pulse current output end of a pulse constant current source sequentially connects the primary sides of a plurality of isolation transformers in series, and the secondary side of each isolation transformer is provided with three outputs which are respectively connected with three rectifying and filtering circuits to form three independent power outputs.

The output pin 1 and the output pin 2 of each isolation transformer are a group of voltage and are connected with the input end of a first bridge rectifier, a capacitor for filtering is connected between the two output ends of the first bridge rectifier, and the two output ends of the first bridge rectifier are respectively used as the positive pole and the negative pole of a direct-current power supply to form direct-current voltage DC _ 1.

And 3 pins and 4 pins of the output of each isolation transformer are a group of voltage connected with the input end of a second bridge rectifier, a capacitor for filtering is connected between two output ends of the second bridge rectifier, and the two output ends of the second bridge rectifier are respectively used as the positive pole and the negative pole of a direct-current power supply to form direct-current voltage DC _ 2.

The output 5 pin and the output 6 pin of each isolation transformer are a group of voltage and are connected with the input end of a third bridge rectifier, a capacitor and a voltage-stabilizing tube which are arranged in parallel are connected between two output ends of the third bridge rectifier, the positive output end of the third bridge rectifier passes through the input end of a three-terminal integrated voltage-stabilizing tube, the grounding end of the three-terminal integrated voltage-stabilizing tube is connected with the negative output end of the third bridge rectifier, a potentiometer is connected between the output end of the three-terminal integrated voltage-stabilizing tube and the negative output end of the third bridge rectifier, and the positive output end and the negative output end of the third bridge rectifier form direct-current voltage DC _ 3.

And the output end of the three-end integrated voltage-stabilizing tube is used as a 5V direct-current power supply to output.

The invention uses high-frequency pulse constant current source as power supply source to supply power to the isolation transformer of each isolation type multi-path output power supply, which simply realizes high potential suspension work isolation measure, ensures the multi-path output level consistency of each isolation transformer due to constant current characteristic, connects a voltage stabilizing diode in parallel on one path of rectification output DC bus, effectively limits the voltage output by the same isolation transformer to each maximum value, simultaneously adopts a three-terminal integrated voltage stabilizer to stabilize voltage to obtain a +5V voltage, then directly connects a potentiometer on the +5V to adjust the potential, thus being capable of adjusting each path of output voltage of the same isolation transformer, and further simply and reliably realizing the isolation type multi-path output power supply and voltage adjustment and limitation of the invention.

Drawings

The following is a brief description of the contents of each figure in the description of the present invention:

FIG. 1 is a schematic diagram of an isolated multi-output power supply circuit;

fig. 2 is a diagram of circuit connection positions in the high-voltage pulse power supply of the isolated multi-output power supply circuit.

Detailed Description

The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.

The invention relates to an isolated multi-output power supply and a voltage regulating and limiting circuit, which can ensure that the maximum voltage of all isolated output circuits is limited to a certain value while realizing high-potential suspension isolated multi-output power supply, can ensure that the output voltages of all circuits are consistent by regulating a potentiometer, provides reliable conditions for the consistency of the on-off of a solid-state switch, has simple and reliable circuit, reduces the volume of an isolation transformer and reduces the production cost.

As shown in fig. 1, the isolated multi-output power circuit mainly comprises a pulse constant current source, N multi-output isolation transformers, an isolator output rectifying and filtering circuit, a voltage limiting regulator tube and a voltage regulating circuit composed of a potentiometer.

The pulse current of the pulse constant current source is output from an Ip + end, passes through an isolation transformer 1(T1), an isolation transformer 2(T2) and an isolation transformer N (T3) through a single lead, respectively enters from Iin and exits from Iout, and returns to the pulse constant current source from the Ip-end of the pulse constant current source, and the pulse current can be adjusted by the internal closed loop of the pulse constant current source.

The isolation transformer 1 outputs a group of voltages of pin 1 and pin 2, which are rectified by the bridge stack VA1 and then filtered by the capacitor CA1 to obtain the required DC voltage DC _ a1, and the isolation transformer 1 outputs a group of voltages of pin 3 and pin 4, which are rectified by the bridge stack VA2 and then filtered by the capacitor CA2 to obtain the required DC voltage DC _ a 2.

The isolation transformer 1 outputs 5 pins and 6 pins as a group of voltage, the group of voltage is rectified by a bridge stack VA3 and then filtered by a capacitor CA3 to obtain required direct current voltage DC _ A3, a voltage stabilizing tube VA4 is connected in parallel with the CA3 and can be limited to a certain maximum value by DC _ A1, DC _ A2 and DC _ A3, the output end DC _ A3+ of the direct current voltage DC _ A3 is stabilized by a three-terminal integrated voltage stabilizing tube NA1 to obtain +5V voltage output, then a potentiometer RPA1 is connected between the +5V voltage output end and the DC _ A3-output according to the mode shown in the figure 1, and synchronous regulation can be realized on DC _ A1, DC _ A2 and DC _ A3 by utilizing RPA 1.

Similarly, the pin 1 and the pin 2 output by the isolation transformer 2 are a group of voltages, which are rectified by the bridge rectifier VB1 and then filtered by the capacitor CB1 to obtain the required direct current voltage DC _ B1, and the pin 3 and the pin 4 output by the isolation transformer 2 are a group of voltages, which are rectified by the bridge rectifier VB2 and then filtered by the capacitor CB2 to obtain the required direct current voltage DC _ B2.

The isolation transformer 2 outputs 5 pins and 6 pins as a group of voltage, the group of voltage is rectified by a bridge stack VB3 and then filtered by a capacitor CB3 to obtain required direct current voltage DC _ B3, a voltage regulator tube VB4 is connected in parallel to the CB3 and can be limited to a certain maximum value by DC _ B1, DC _ B2 and DC _ B3, an output end DC _ B3+ of the direct current voltage DC _ B3 is regulated by a three-terminal integrated voltage regulator tube NB1 to obtain +5VB voltage output, then a potentiometer RPB1 is connected between the +5VB voltage output end and the DC _ B3-output according to the mode shown in the drawing 1, and synchronous regulation can be realized on DC _ B1, DC _ B2 and DC _ B3 by utilizing RPB 1.

Similarly, the pin 1 and the pin 2 of the output of the isolation transformer N are a group of voltages, the group of voltages is rectified by a bridge stack VN1, the group of voltages is obtained by filtering through a capacitor CN1, the group of voltages is obtained by the pin 3 and the pin 4 of the output of the isolation transformer 2, the group of voltages is obtained by filtering through a bridge stack VN2, the group of voltages is obtained by filtering through a capacitor CN2, the group of voltages is obtained by the pin 5 and the pin 6 of the output of the isolation transformer 2, the group of voltages is rectified by a bridge stack VN3, the group of voltages is obtained by filtering through a capacitor CN3, the required direct current voltage DC _ N3 is obtained by connecting a voltage stabilizing tube VN4 in parallel with CN3, the voltage stabilizing tube VN1, DC _ N2 and DC _ N3 can be limited to a certain maximum value, the output end DC _ N3 is obtained by stabilizing the voltage through a three-terminal integrating tube NN1, the +5VN voltage output is connected between the +5VN voltage output end and the DC _ N4642 output, and a potential pair can be connected between the RPN 4642 according to, DC _ N2, DC _ N3 achieve synchronous regulation. Thereby forming an isolated multi-output power supply and voltage regulation and limitation.

The isolated multi-output power supply can form a multi-output power supply, and the driving power supply 1 (including DC _ a1+ and DC _ a1-, DC _ a2+ and DC _ a2-, DC _ A3+ and DC _ A3-, and +5V) provides auxiliary power for the solid-state switch tube S1(MOSFET module) in fig. 2; the driving power source 2 (including DC _ B1+ and DC _ B1-, DC _ B2+ and DC _ B2-, DC _ B3+ and DC _ B3-, and +5VB) provides auxiliary power for the solid-state switch S2(MOSFET module) in fig. 2; by analogy, the driving power source N (including DC _ N1+ and DC _ N1-, DC _ N2+ and DC _ N2-, DC _ N3+ and DC _ N3-, and +5VN) provides auxiliary power for the solid state switching tube SN (MOSFET module) in fig. 2.

Based on the circuit structure, the isolated multi-path output power supply and the voltage regulation and limitation effectively solve the problems of high-voltage isolation of a system, inconsistent and non-independent regulation of multi-path output voltage and the like, optimize the volume and the weight of the power supply, reduce the cost, meet the development requirement of miniaturization of a high-voltage solid-state modulator and a high-voltage solid-state pulse power supply system, have simple and reliable circuits, use simple components to form the voltage limitation and regulation of the isolated multi-path output power supply, avoid the interference problem caused by a complex regulation circuit, and reduce the design and manufacture requirements of an isolation transformer because the output voltage of the isolator can be limited and regulated.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.