阅读说明：本技术 隔离型可编程自动倍压整流电路 (Isolation type programmable automatic voltage doubling rectifying circuit ) 是由 何成东 帅康 于 2019-09-19 设计创作，主要内容包括：本发明提供一种隔离型可编程自动倍压整流电路,包括交流电压的第一输入端、交流电压的第二输入端、功率整流模块、辅助电源模块、倍压控制模块和电压输出端,功率整流模块包括与交流电压的第一输入端连接的第一输入端、与交流电压的第二输入端连接的第二输入端、与倍压控制模块连接的输出端；功率整流模块用于对交流电压进行功率整流,辅助电源模块用于为倍压控制模块提供辅助电源,倍压控制模块用于实现对交流电压进行倍压控制；本发明能够实现无晶闸管的单相自动倍压整流。因无串联线性开关,能够减少倍压损耗,提高产品在倍压状态下和非倍压下的的效率。(The invention provides an isolated programmable automatic voltage-multiplying rectification circuit, which comprises a first input end of alternating voltage, a second input end of the alternating voltage, a power rectification module, an auxiliary power supply module, a voltage-multiplying control module and a voltage output end, wherein the power rectification module comprises a first input end connected with the first input end of the alternating voltage, a second input end connected with the second input end of the alternating voltage and an output end connected with the voltage-multiplying control module; the power rectification module is used for performing power rectification on the alternating-current voltage, the auxiliary power supply module is used for providing an auxiliary power supply for the voltage doubling control module, and the voltage doubling control module is used for realizing voltage doubling control on the alternating-current voltage; the invention can realize single-phase automatic voltage-multiplying rectification without a thyristor. Due to the non-series linear switch, the voltage doubling loss can be reduced, and the efficiency of the product in a voltage doubling state and a non-voltage doubling state is improved.)

1. An isolated programmable automatic voltage-doubling rectifying circuit is characterized in that: comprises a first input end of alternating voltage, a second input end of the alternating voltage, a power rectification module, an auxiliary power supply module, a voltage doubling control module and a voltage output end,

the power rectification module comprises a first input end connected with a first input end of alternating voltage, a second input end connected with a second input end of the alternating voltage, and an output end connected with the voltage doubling control module;

the auxiliary power supply module comprises a third input end connected with the first input end of the alternating voltage, a fourth input end connected with the second input end of the alternating voltage, a first output end connected with the voltage-multiplying control module and a second output end connected with the first grounding end;

the voltage doubling control module comprises a fifth input end connected with the first input end of the alternating voltage, a sixth input end connected with the second input end of the alternating voltage, a seventh input end connected with the first output end of the auxiliary power supply module, an eighth input end connected with the output end of the power rectification module, a voltage output end and a second grounding end;

the power rectification module is used for performing power rectification on the alternating-current voltage, the auxiliary power supply module is used for providing an auxiliary power supply for the voltage-doubling control module, and the voltage-doubling control module is used for realizing voltage-doubling control on the alternating-current voltage.

2. The isolated programmable automatic voltage doubling rectifier circuit of claim 1, wherein: the voltage doubling control module comprises a mains supply sampling unit, a voltage comparison unit and a control unit.

3. The isolated programmable automatic voltage doubling rectifier circuit of claim 2, wherein: the utility power sampling unit comprises a diode D3, a diode D4, a resistor R7, a capacitor C3, a resistor R12 and a resistor R17, the anode of the diode D3 is used as the fifth input end of the voltage-doubling control module, the anode of the diode D4 is used as the sixth input end of the voltage-doubling control module, one end of the resistor R7 is connected with the junction of the fifth input end of the voltage-doubling control module and the sixth input end of the voltage-doubling control module, the other end of the resistor R7 is connected with the second grounding end through the capacitor C3, and the other end of the resistor R7 is also connected with the second grounding end through the resistor R12 and the resistor R17.

4. The isolated programmable automatic voltage doubling rectifier circuit of claim 3, wherein: the voltage comparison unit comprises a resistor R, a comparator U, an amplifier U, a resistor R, a capacitor C, a resistor R and a resistor R, one end of the resistor R is connected with the seventh input end of the voltage doubling control module, the other end of the resistor R is connected with the second grounding end through the resistor R, the other end of the resistor R is also connected with the reference voltage end of the comparator U through the resistor R, the input voltage end of the comparator U is connected with the intersection of the resistor R and the resistor R through the resistor R and the resistor R, one end of the capacitor C is connected with the intersection of the resistor R and the resistor R, the other end of the capacitor C is connected with the second grounding end, the input voltage end of the comparator U is also connected with the seventh input end of the voltage doubling control module through the resistor R and, the other end of the resistor R10 is connected with the output end of the comparator U2, the other end of the resistor R10 is further connected with the intersection of the resistor R15 and the resistor R5, one end of the resistor R18 is connected with a second grounding end, the other end of the resistor R18 is connected with the positive phase input end of the inverter through the resistor R16, one end of the resistor R19 is connected with the seventh input end of the voltage doubling control module, the other end of the resistor R19 is connected with the intersection of the resistor R18 and the resistor R16, and the output end of the inverter is connected with the seventh input end of the voltage doubling control module through the resistor R6.

5. The isolated programmable automatic voltage doubling rectifier circuit of claim 4, wherein: the control unit comprises a diode D1, a diode D2, a resistor R3, a relay K1, a diode D5, a diode D6, a MOS tube Q1, a resistor R11 and a capacitor C5, wherein the anode of the diode D1 is connected with the fifth input end of the voltage doubling control module, the anode of the diode D2 is connected with the sixth input end of the voltage doubling control module, the cathode of the diode D1 and the cathode of the diode D2 are respectively connected with a first coil terminal of the relay K1 through a resistor R3, a second coil terminal of the relay K1 is connected with the anode of a diode D6, the cathode of the diode D6 is connected with the anode of a diode D5, the cathode of the diode D5 is connected with a first coil terminal of the relay K1, a second coil terminal of the relay K1 is connected with the drain of the MOS tube, the source of the MOS tube is connected with the gate of the MOS tube through a capacitor C1, the source of the MOS tube is connected with the second ground terminal, the gate of the MOS tube is connected with the, the first electric contact terminal of the relay K1 is connected with the eighth input end of the voltage-multiplying control module, and the second electric contact terminal of the relay K1 is connected with a load.

6. The isolated programmable automatic voltage doubling rectifier circuit of any of claims 1 to 5, wherein: the power rectification module comprises a full-bridge rectifier BD1, an energy storage capacitor C1, a capacitor C2, a uniform resistor R1, a uniform resistor R2, a first input end of the full-bridge rectifier BD1 serves as a first input end of the power rectification module, a second input end of the full-bridge rectifier BD1 serves as a second input end of the power rectification module, a first output end of the full-bridge rectifier BD1 is connected with an intersection of the energy storage capacitor C1 and the uniform resistor R1, an output end of the power rectification module is respectively connected with an intersection of the energy storage capacitor C1 and the capacitor C2, an intersection of the uniform resistor R1 and the uniform resistor R2, and a second output end of the full-bridge rectifier BD1 is connected with an intersection of the energy storage capacitor C2 and the uniform resistor R2 and.

7. The isolated programmable automatic voltage doubling rectifier circuit of any of claims 1 to 5, wherein: the auxiliary power supply module comprises a full-bridge rectifier BD2 and an adjuster U1, a first input end of the full-bridge rectifier BD2 serves as a third input end of the auxiliary power supply module, a second input end of the full-bridge rectifier BD2 serves as a fourth input end of the auxiliary power supply module, a first output end of the full-bridge rectifier BD2 is connected with a first input end of the adjuster U1, a first output end of the adjuster U1 serves as a first output end of the auxiliary power supply module, a second output end of the full-bridge rectifier BD2 is connected with a second input end of the adjuster U1, and a second output end of the adjuster U1 serves as a second output end of the auxiliary power supply module.

8. The isolated programmable automatic voltage doubling rectifier circuit of any of claims 1 to 5, wherein: after rectification, filtering and resistance voltage division, the alternating voltage is subjected to hysteresis comparison with the voltage of a reference voltage end of a comparator U2, and then passes through an inverter U3, and finally whether the relay K1 works or not is controlled.

9. The isolated programmable automatic voltage doubling rectifier circuit of any of claims 1 to 5, wherein: the working process of the isolated programmable automatic voltage doubling rectifying circuit is as follows: the voltage of the alternating voltage after rectification, filtering and voltage division is used as the voltage of the input voltage end of the comparator U2, when the voltage of the input voltage end of the comparator U2 is greater than the voltage of the reference voltage end of the comparator U2, the output end of the comparator U2 outputs high level, the output end of the comparator U2 outputs low level after passing through the inverter U3, the MOS tube Q1 works in a cut-off state, the relay K1 is in a normally open state, and the circuit is in a non-voltage-multiplying working state;

when the voltage of the input voltage of the comparator U2 is smaller than that of the reference voltage of the comparator U2, the comparator U2 outputs low level, the high level is output after passing through the inverter U3, the MOS tube Q1 works and is in a conducting state, the relay K1 is in a normally closed state, and the circuit is in a voltage-multiplying working state.

Technical Field

The invention relates to an isolated programmable automatic voltage-doubling rectifying circuit.

Background

The voltage-multiplying rectification principle is that the rectification and guiding action of diode are used to store the voltage on their respective capacitors, then they are series-connected according to the principle of polarity addition, and the high voltage higher than input voltage is outputted.

At present, the voltage-doubling rectification scheme of products on the market is completed by utilizing an integrated chip (with a function of identifying the phase of the mains supply) and then controlling the conduction angle of a thyristor (between an L line of the series mains supply and the intersection point of two series energy storage capacitors after rectification). Such as the integrated chip AVS1A capacitor CP08 and the a capacitor CS12 capacitor CB.

The method for controlling the thyristor by using the integrated chip has the following disadvantages although the elements are few and the cost is low: 1) because the linear switching thyristor is connected in series with the input L-line, the power supplied to the subsequent stage is limited to a maximum power of 500W for example in the case of the above-mentioned chip; 2) because the linear switch thyristor is connected in series on the input L line, the efficiency of the product is reduced, and the heavier the load, the larger the loss is; 3) because of the limitations of the integrated control chip itself, it can only operate at 15% of the voltage range at 110VAC or 220VAC input. When the mains input is between 110VAV 1.2 and 220V 0.8, the curve formed by the rectified dc voltage divided by the mains will not be fixed, increasing linearly from 110VAC to 240VAC and dropping linearly from 240VAC to 110VAC will result in no doubling (dc voltage less than 250V) and overvoltage (dc voltage over 400V). This would pose a risk to the product.

The above-described problems are problems that should be considered and solved in the design process of the voltage-doubler rectifier circuit.

Disclosure of Invention

The invention aims to provide an isolated programmable automatic voltage doubling rectifying circuit to solve the problems of reducing voltage doubling loss and improving the efficiency of products in a voltage doubling state and a non-voltage doubling state.

The technical solution of the invention is as follows:

an isolated programmable automatic voltage-doubling rectifying circuit comprises a first input end of alternating voltage, a second input end of the alternating voltage, a power rectifying module, an auxiliary power supply module, a voltage-doubling control module and a voltage output end,

the power rectification module comprises a first input end connected with a first input end of alternating voltage, a second input end connected with a second input end of the alternating voltage, and an output end connected with the voltage doubling control module;

the auxiliary power supply module comprises a third input end connected with the first input end of the alternating voltage, a fourth input end connected with the second input end of the alternating voltage, a first output end connected with the voltage-multiplying control module and a second output end connected with the first grounding end;

the voltage doubling control module comprises a fifth input end connected with the first input end of the alternating voltage, a sixth input end connected with the second input end of the alternating voltage, a seventh input end connected with the first output end of the auxiliary power supply module, an eighth input end connected with the output end of the power rectification module, a voltage output end and a second grounding end;

the power rectification module is used for performing power rectification on the alternating-current voltage, the auxiliary power supply module is used for providing an auxiliary power supply for the voltage-doubling control module, and the voltage-doubling control module is used for realizing voltage-doubling control on the alternating-current voltage.

Optionally, the voltage-doubling control module includes a mains sampling unit, a voltage comparison unit and a control unit.

Optionally, the utility power sampling unit includes a diode D3, a diode D4, a resistor R7, a capacitor C3, a resistor R12, and a resistor R17, an anode of the diode D3 is used as a fifth input terminal of the voltage-doubling control module, an anode of the diode D4 is used as a sixth input terminal of the voltage-doubling control module, one end of the resistor R7 is connected to a junction between the fifth input terminal of the voltage-doubling control module and the sixth input terminal of the voltage-doubling control module, the other end of the resistor R7 is connected to a second ground terminal through the capacitor C3, and the other end of the resistor R7 is further connected to the second ground terminal through the resistors R12 and R17.

Optionally, the voltage comparison unit includes a resistor R, a comparator U, an amplifier U, a resistor R, a capacitor C, a resistor R, and a resistor R, one end of the resistor R is connected to the seventh input terminal of the voltage doubling control module, the other end of the resistor R is connected to the second ground terminal through the resistor R, the other end of the resistor R is further connected to the reference voltage terminal of the comparator U through the resistor R, an input voltage terminal of the comparator U is connected to the intersection of the resistor R and the resistor R through the resistor R and the resistor R, one end of the capacitor C is connected to the intersection of the resistor R and the resistor R, the other end of the capacitor C is connected to the second ground terminal, an input voltage terminal of the comparator U is further connected to the seventh input terminal of the voltage doubling control module through the resistor R and the resistor R, the other end of the resistor R10 is connected with the output end of the comparator U2, the other end of the resistor R10 is further connected with the intersection of the resistor R15 and the resistor R5, one end of the resistor R18 is connected with a second grounding end, the other end of the resistor R18 is connected with the positive phase input end of the inverter through the resistor R16, one end of the resistor R19 is connected with the seventh input end of the voltage doubling control module, the other end of the resistor R19 is connected with the intersection of the resistor R18 and the resistor R16, and the output end of the inverter is connected with the seventh input end of the voltage doubling control module through the resistor R6.

Optionally, the control unit includes a diode D1, a diode D2, a resistor R3, a relay K1, a diode D5, a diode D6, a MOS transistor Q1, a resistor R11, and a capacitor C5, an anode of the diode D1 is connected to the fifth input terminal of the voltage-doubling control module, an anode of the diode D2 is connected to the sixth input terminal of the voltage-doubling control module, a cathode of the diode D1 and a cathode of the diode D2 are respectively connected to the first coil terminal of the relay K1 through a resistor R3, a second coil terminal of the relay K1 is connected to the anode of the diode D6, a cathode of the diode D6 is connected to the anode of the diode D5, a cathode of the diode D5 is connected to the first coil terminal of the relay K1, a second coil terminal of the MOS transistor K1 is connected to the drain of the MOS transistor, a source of the MOS transistor is connected to the gate of the MOS transistor through a capacitor C1, a source of the MOS transistor is connected to the second ground terminal, and a junction of the resistor R, the first electric contact terminal of the relay K1 is connected with the eighth input end of the voltage-multiplying control module, and the second electric contact terminal of the relay K1 is connected with a load.

Optionally, the power rectification module includes a full-bridge rectifier BD1, an energy storage capacitor C1, a capacitor C2, a uniform resistor R1, and a uniform resistor R2, a first input end of the full-bridge rectifier BD1 serves as a first input end of the power rectification module, a second input end of the full-bridge rectifier BD1 serves as a second input end of the power rectification module, a first output end of the full-bridge rectifier BD1 is connected to an intersection of the energy storage capacitor C1 and the uniform resistor R1, an output end of the power rectification module is respectively connected to an intersection of the energy storage capacitor C1 and the capacitor C2, an intersection of the uniform resistor R1 and the uniform resistor R2, and a second output end of the full-bridge rectifier BD1 is connected to an intersection of the energy storage capacitor C2 and the uniform resistor R2.

Optionally, the auxiliary power module includes a full-bridge rectifier BD2 and an adjuster U1, a first input terminal of the full-bridge rectifier BD2 is used as a third input terminal of the auxiliary power module, a second input terminal of the full-bridge rectifier BD2 is used as a fourth input terminal of the auxiliary power module, a first output terminal of the full-bridge rectifier BD2 is connected to a first input terminal of the adjuster U1, a first output terminal of the adjuster U1 is used as a first output terminal of the auxiliary power module, a second output terminal of the full-bridge rectifier BD2 is connected to a second input terminal of the adjuster U1, and a second output terminal of the adjuster U1 is used as a second output terminal of the auxiliary power module.

Optionally, after the alternating voltage is rectified, filtered and subjected to resistance voltage division, the alternating voltage is subjected to hysteresis comparison with the voltage of the reference voltage end of the comparator U2, and then the alternating voltage passes through the inverter U3, and finally whether the relay K1 works or not is controlled.

Optionally, the isolation type programmable automatic voltage-doubling rectifying circuit works in the following process: the voltage of the alternating voltage after rectification, filtering and voltage division is used as the voltage of the input voltage end of the comparator U2, when the voltage of the input voltage end of the comparator U2 is greater than the voltage of the reference voltage end of the comparator U2, the output end of the comparator U2 outputs high level, the output end of the comparator U2 outputs low level after passing through the inverter U3, the MOS tube Q1 works in a cut-off state, the relay K1 is in a normally open state, and the circuit is in a non-voltage-multiplying working state;

when the voltage of the input voltage of the comparator U2 is smaller than that of the reference voltage of the comparator U2, the comparator U2 outputs low level, the high level is output after passing through the inverter U3, the MOS tube Q1 works and is in a conducting state, the relay K1 is in a normally closed state, and the circuit is in a voltage-multiplying working state.

The invention has the beneficial effects that:

the isolated programmable automatic voltage-multiplying rectification circuit can realize single-phase automatic voltage-multiplying rectification without a thyristor. Because the invention has no series linear switch (such as a thyristor), the voltage-multiplying loss can be reduced, and the efficiency of the product under the voltage-multiplying state and the non-voltage-multiplying state is improved.

The isolated programmable automatic voltage-doubling rectifying circuit has a wide working voltage range. The invention can work in the voltage range of 100VAC to 240VAC, and can solve the problem that the existing special integrated voltage-multiplying chip can only work in the voltage range of +/-15% when inputting 110VAC or 220 VAC.

According to the isolated programmable automatic voltage doubling rectifying circuit, the commercial power is linearly increased to 240VAC from 110VAC, the commercial power is linearly decreased to 110VAC from 240VAC, output direct-current voltage VDC curves are almost overlapped, and the stability of a product is improved.

The voltage doubling threshold is programmable, the voltage doubling threshold voltage is adjusted by setting the resistance values of R7, R12 and R17, the voltage doubling threshold can be flexibly adjusted according to the product requirements, and the power conversion circuit is applicable to power conversion in multiple fields.

Drawings

Fig. 1 is a schematic diagram illustrating an isolated programmable automatic voltage-doubling rectifying circuit according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of the voltage-doubling control module in the embodiment.

Fig. 3 is a circuit schematic diagram of a power rectification module in an embodiment.

Fig. 4 is a circuit diagram of an auxiliary power supply module in an embodiment.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.