WO2018076294A1 - Reverse connection and current backflow prevention circuit - Google Patents

Abstract

A reverse connection and current backflow prevention circuit comprises a voltage input end (VCC); a voltage output end (VOUT); a control circuit (10) for outputting a first control signal or a second control signal; a switch circuit (20), which is switched on when the first control signal is received, and is switch off when the second control signal is received; and an output circuit (30). When a first input end is connected to a positive electrode of a power supply and a second input end is connected to a negative electrode of the power supply, the power supply outputs a voltage to a back-end circuit; and when the first input end is connected to the negative electrode of the power supply and the second input end is connected to the positive electrode of the power supply or the power supply is in a short circuit, the voltage and the backflow current are not provided to the back-end circuit.

Description

Anti-reverse connection and current reverse irrigation circuit

[Technical Field]

The present invention relates to the field of power supply technologies, and in particular, to an anti-reverse connection and current reverse irrigation circuit.

 【Background technique】

Low-power DC power supplies generally use diodes as anti-reverse or current-reverse circuits to prevent damage to the power supply and back-end circuits due to reverse power supply or current back-up, but as power increases, diode losses increase. , seriously affect the efficiency of the power supply. The high-power power supply basically uses a metal oxide field effect transistor (MOSFET) or an integrated chip as an anti-reverse circuit, and the loss is small, but the cost of the integrated chip is high, and the MOSFET cost is low, but the circuit cannot be timely in the presence of current backflow. Turning off the MOSFET may cause the power supply to work abnormally or even risk the damage. The current backflow of this circuit mainly comes from two aspects. One is that the power supply is suddenly short-circuited, and the input capacitor will be quickly discharged through the input terminal, thus forming a current reverse. Irrigation, in bridge current synchronous rectification, may cause the synchronous rectification MOSFET drain-source voltage to increase sharply, damage the MOSFET, and may damage the power supply; the other is the negative surge (-48V vs. voltage input loop surge) A current backflow may occur, causing the power supply to lose power.

 [Summary of the Invention]

The technical problem to be solved by the present invention is to provide an anti-reverse connection and current reverse irrigation circuit to meet the demand of high-power power supply while reducing the cost and shutting down the circuit in time to prevent damage to the power supply and the back-end circuit.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide an anti-reverse connection and current reverse irrigation circuit, including:

a voltage input terminal connected to the first input terminal for receiving an input voltage;

a voltage output end connected to the back end circuit for outputting a voltage to the back end circuit;

a control circuit, connected to the voltage input terminal and the voltage output terminal, for receiving a voltage from the voltage input terminal and outputting a first control signal or a second control signal;

a switching circuit, connected to the control circuit, the voltage output end and the second input end, for receiving the first control signal or the second control signal from the control circuit, the switch circuit receiving the Turning on when a control signal is turned on, and the switch circuit is turned off when receiving the second control signal;

An output circuit connecting the voltage input terminal, the control circuit, the switch circuit, the voltage output terminal and the second input terminal, when the first input terminal is connected to a positive pole of the power source and the second input When the terminal is connected to the negative pole of the power source, the control circuit outputs the first control signal to the switch circuit, the switch circuit is turned on, and the power source passes through the output circuit, the switch circuit, and the voltage Outputting an output voltage to the back end circuit; when the first input terminal is connected to a negative pole of the power source and the second input end is connected to a positive pole of the power source or a short circuit of a power source connected to the first and second input terminals The output circuit pulls down the voltage supplied to the control circuit by the voltage input terminal such that the control circuit outputs the second control signal to the switch circuit, the switch circuit is turned off, the second input The voltage at the terminal and the sink current are not supplied to the back end circuit through the switching circuit and the voltage output terminal.

The control circuit includes first and second resistors, first and second controllable switches, a first end of the first resistor is connected to the voltage input end, and a second end of the first resistor is connected to the second end a control end of the first controllable switch, a first end of the first controllable switch is connected to the voltage input end, and a second end of the first controllable switch is connected to a second end of the second controllable switch And the switch circuit, the first end of the second controllable switch is connected to the switch circuit and the voltage output end, and the control end of the second controllable switch is connected to the control of the first controllable switch And the first end of the second resistor, the second end of the second resistor is connected to the switch circuit and the voltage output end.

The first controllable switch is an NPN-type triode, and the control end, the first end and the second end of the first controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type triode; The second controllable switch is a PNP type transistor, and the control end, the first end and the second end of the second controllable switch respectively correspond to a base, a collector and an emitter of the PNP type transistor.

The switch circuit includes a third resistor, a third controllable switch, and a first diode, and the control end of the third controllable switch is connected to the first and second controllable switches via the third resistor The second end of the third controllable switch is connected to the first end of the second controllable switch, the second end of the second resistor, and the voltage output end, the third a first end of the control switch is connected to the second input end, an anode of the first diode is connected to a second end of the third controllable switch, and a cathode of the first diode is connected to the third end The first end of the controllable switch.

The third controllable switch is an N-type MOS field effect transistor, and the control end, the first end and the second end of the third controllable switch respectively correspond to gates and drains of the N-type MOS field effect transistor Extreme and source.

The output circuit includes a fourth resistor, fourth and fifth controllable switches, second and third diodes, and a first end of the fourth resistor is connected to the voltage input end, and the fourth resistor The second end is connected to the control end of the fourth controllable switch, the first end of the fourth controllable switch is connected to the second end of the first resistor, and the second end of the fourth controllable switch is connected An anode of the second diode, a cathode of the second diode is connected to a second end of the third controllable switch, and a second end of the fifth controllable switch is connected to the fourth resistor a second end and a control end of the fourth controllable switch, the control end of the fifth controllable switch being connected to the first end of the fifth controllable switch and connected to the anode of the third diode The cathode of the third diode is connected to the second input end and the first end of the third controllable switch.

The fourth controllable switch is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type triode; The fifth controllable switch is a PNP type triode, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to a base, a collector and an emitter of the PNP type triode.

The fourth controllable switch is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type triode; The fifth controllable switch is a PNP type triode, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to a base, an emitter and a collector of the PNP type triode.

The output circuit includes a fourth resistor, fourth and fifth controllable switches, second and third diodes, and a first end of the fourth resistor is connected to the voltage input end, and the fourth resistor The second end is connected to the control end of the fourth controllable switch, the control end of the fifth controllable switch, and the first end of the fifth controllable switch, and the first end of the fourth controllable switch Connecting a second end of the first resistor, a second end of the fourth controllable switch is connected to an anode of the second diode, and a cathode of the second diode is connected to the third controllable switch The second end of the fifth controllable switch is connected to the anode of the third diode, the cathode of the third diode is connected to the second input end and the third controllable The first end of the switch.

The fourth controllable switch is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type triode; The fifth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to a base, a collector and an emitter of the NPN type triode.

The fourth controllable switch is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type triode; The fifth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to a base, an emitter and a collector of the NPN type triode.

Wherein the output circuit further includes a fourth diode, an anode of the fourth diode is connected to a second end of the fourth resistor, and a cathode of the fourth diode is connected to the first resistor Second end.

The output circuit further includes a first capacitor, the first end of the first capacitor is connected to the voltage input end, and the second end of the first capacitor is connected to the second end of the third controllable switch.

The anti-reverse and current sink circuit further includes an auxiliary source, the input end of the auxiliary source is connected to the first input end, and the output end of the auxiliary source is connected to the voltage input end.

The anti-reverse and current sink circuit further includes a slow start circuit connected between the first input end and the voltage output end.

The anti-reverse connection and current reverse irrigation circuit further includes a DC voltage conversion circuit, and the DC voltage conversion circuit is connected to the slow start circuit.

The anti-reverse and current sink circuit further includes a second capacitor connected between the slow start circuit and the DC voltage conversion circuit.

The beneficial effects of the present invention are: different from the prior art, the anti-reverse and current sinking circuit of the present invention provides the first and second control signals through the control circuit to control the switching circuit to be turned on or By cutting off, the output circuit is further controlled to provide a voltage to the back-end circuit to meet the demand of the high-power power supply while reducing the cost and shutting down the circuit in time to prevent the power supply from being reversed or the current back-fluxing damage the power supply and the back-end circuit. .

 [Description of the Drawings]

1 is a circuit diagram of a first embodiment of an anti-reverse and current sink circuit of the present invention;

Figure 2 is a circuit diagram of a second embodiment of the anti-reverse and current sink circuit of the present invention;

Figure 3 is a circuit diagram of a third embodiment of the anti-reverse and current sink circuit of the present invention;

Figure 4 is a circuit diagram of a fourth embodiment of the anti-reverse and current sink circuit of the present invention.

【detailed description】

Please refer to FIG. 1, which is a circuit diagram of a first embodiment of the anti-reverse and current sink circuit of the present invention. As shown in FIG. 1, the anti-reverse connection and current reverse irrigation circuit includes a voltage input terminal VCC connected to the first input terminal for receiving an input voltage, and a voltage output terminal VOUT connected to the back end circuit for outputting a voltage to the device. The control circuit 10 is connected to the voltage input terminal VCC and the voltage output terminal VOUT for receiving a voltage from the voltage input terminal VCC and outputting a first control signal or a second control signal; the switch circuit 20 Connecting the control circuit 10, the voltage output terminal VOUT, and the second input terminal for receiving the first control signal or the second control signal from the control circuit 10, and the switch circuit 20 receives the When the first control signal is turned on, the switch circuit 20 is turned off when receiving the second control signal; the output circuit 30 is connected to the voltage input terminal VCC, the control circuit 10, the switch circuit 20, the a voltage output terminal VOUT and the second input end, when the first input terminal is connected to the positive pole of the power source and the second input terminal is connected to the negative pole of the power source, the control circuit 10 outputs the first control signal Giving a switching circuit 20, the switching circuit 20 is turned on, the power supply outputs a voltage to the back end circuit through the output circuit 30, the switching circuit 20, and the voltage output terminal VOUT; when the first input When the terminal is connected to the negative pole of the power source and the second input terminal is connected to the positive pole of the power source or the power source connected to the first and second input terminals is short-circuited, the output circuit 30 pulls the voltage input terminal VCC downward to provide The voltage of the control circuit 10 causes the control circuit 10 to output the second control signal to the switch circuit 20, the switch circuit 20 is turned off, the power source does not pass through the switch circuit 20 and the voltage output The terminal VOUT outputs a voltage to the back end circuit.

Specifically, the control circuit 10 includes first and second resistors R1 and R2, first and second controllable switches T1 and T2, and a first end of the first resistor R1 is connected to the voltage input terminal VCC. The second end of the first resistor R1 is connected to the control end of the first controllable switch T1, and the first end of the first controllable switch T1 is connected to the voltage input terminal VCC, the first controllable switch T1 The second end of the second controllable switch T2 is connected to the switch circuit 20, and the first end of the second controllable switch T2 is connected to the switch circuit 20 and the voltage output terminal VOUT. The control end of the second controllable switch T2 is connected to the control end of the first controllable switch T1 and the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the switch circuit 20 and the voltage output terminal VOUT.

In this embodiment, the first controllable switch T1 is an NPN-type triode, and the control end, the first end, and the second end of the first controllable switch T1 respectively correspond to a base and a set of the NPN-type triode An electrode and an emitter; the second controllable switch T2 is a PNP type transistor, and the control end, the first end and the second end of the second controllable switch T2 respectively correspond to a base and a collector of the PNP type transistor And the emitter.

The switch circuit 20 includes a third resistor R3, a third controllable switch T3, and a first diode D1. The control end of the third controllable switch T3 is connected to the first and the third via the third resistor R3. The second end of the second controllable switch T1 is connected to the second end of the second controllable switch T2, the second end of the second controllable switch T2, and the second end of the second resistor R2 a voltage output terminal VOUT, a first end of the third controllable switch T3 is connected to the second input end, and an anode of the first diode D1 is connected to a second end of the third controllable switch T3. The cathode of the first diode D1 is connected to the first end of the third controllable switch T3.

In this embodiment, the third controllable switch T3 is an N-type MOS field effect transistor, and the control end, the first end, and the second end of the third controllable switch T3 respectively correspond to the N-type MOS field effect The gate, drain and source of the tube. The first control signal received by the third controllable switch T3 is a high level signal, and the second control signal received by the third controllable switch T3 is a low level signal. The first diode D1 is a body diode of the third controllable switch T3, and the first diode D1 is packaged with the third controllable switch T3.

The output circuit 30 includes a fourth resistor R4, a fourth controllable switch T4, and a fifth controllable switch T5, a second diode D2, and a third diode D3. The first end of the fourth resistor R4 is connected. The second end of the fourth resistor R4 is connected to the control end of the fourth controllable switch T4, and the first end of the fourth controllable switch T4 is connected to the first resistor R1. a second end, the second end of the fourth controllable switch T4 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the second of the third controllable switch T3 The second end of the fifth controllable switch T5 is connected to the second end of the fourth resistor R4 and the control end of the fourth controllable switch T4, and the control end of the fifth controllable switch T5 is connected. a first end of the fifth controllable switch T5 is connected to an anode of the third diode D3, a cathode of the third diode D3 is connected to the second input end, and the third controllable The first end of the switch T3.

In this embodiment, the fourth controllable switch T4 is an NPN-type triode, and the control end, the first end, and the second end of the fourth controllable switch T4 respectively correspond to a base and a set of the NPN-type triode An electrode and an emitter; the fifth controllable switch T5 is a PNP type transistor, and the control end, the first end and the second end of the fifth controllable switch T5 respectively correspond to a base and a collector of the PNP type transistor And the emitter. The fourth and fifth controllable switches T4 and T5 are integrated pairs of transistors, which are packaged together, and the second and third diodes D2 and D3 are integrated pairs of diodes, which are packaged together.

The output circuit 30 further includes a fourth diode D4, an anode of the fourth diode D4 is connected to a second end of the fourth resistor R4, and a cathode of the fourth diode D4 is connected to the first a second end of the resistor R1; the output circuit 30 further includes a first capacitor C1, a first end of the first capacitor C1 is connected to the voltage input terminal VCC, and a second end of the first capacitor C1 is connected to the second end The second end of the third controllable switch T3.

The anti-reverse and current sink circuit further includes an auxiliary source 40, an input end of the auxiliary source 40 is connected to the first input end, and an output end of the auxiliary source 40 is connected to the voltage input terminal VCC; The anti-reverse connection and current reversal circuit further includes a slow start circuit 50 connected between the first input end and the voltage output end VOUT; the anti-reverse connection and current reverse irrigation circuit further The DC voltage conversion circuit 60 is connected to the slow start circuit 50; the anti-reverse and current reverse circuit further includes a second capacitor C2, and the second capacitor C2 is connected to the The startup circuit 50 is connected to the DC voltage conversion circuit 60. The auxiliary source 40 is configured to supply a voltage of 12V to the voltage input terminal VCC, and the DC voltage conversion circuit 60 is configured to adaptively convert a DC voltage to meet circuit requirements, the slow start circuit 50 and the DC voltage. The conversion circuit 60 is a prior art, and is not described herein again. The first capacitor C1 is a decoupling capacitor, and the second capacitor C2 is a storage capacitor.

The working principle of the anti-reverse connection and current reverse irrigation circuit is described as follows:

When the first input end is connected to the positive pole of the power source and the second input end is connected to the negative pole of the power source, that is, when the power source is normally connected, the control end of the first controllable switch T1 receives a high level signal. Turning on, the second controllable switch T2 is turned off, and the voltage input terminal VCC provides an output voltage of the power source (such as a high level signal) through the first controllable switch T1 and the third resistor R3. Giving the third controllable switch T3 to the control end of the third controllable switch T3, the current flowing from the second end of the third controllable switch T3 to the first end, because the third The controllable switch T3 is a forward voltage drop, and the voltage input terminal VCC passes the output voltage of the power source through the fourth resistor R4, the fifth controllable switch T5, the third diode D3, The third controllable switch T3 and the voltage output terminal VOUT are provided to the back end circuit, and the fourth controllable switch T4 is in an off or unsaturated conduction state, so the third controllable switch T3 is maintained. The circuit works stably.

When the first input terminal is connected to the negative pole of the power source and the second input terminal is connected to the positive pole of the power source, that is, when the power source is reversely connected or when there is current backflow (such as a short circuit of the power source), then the third controllable The first terminal voltage of the switch T3 is greater than the voltage of the second terminal thereof, that is, the third controllable switch T3 is a negative voltage drop, and then the voltage input terminal VCC passes the output voltage of the power source through the fourth The resistor R4, the fourth controllable switch T4, the second diode D2, and the voltage output terminal VOUT are provided to the back end circuit, and the fourth controllable switch T4 is forward biased and turned on. Lowering the voltages of the control terminals of the first and second controllable switches T1 and T2, the second controllable switch T2 is turned on such that the control terminal of the third controllable switch T3 receives a low level signal, The third controllable switch T3 is turned off, thereby preventing the reverse voltage or the reverse current of the second input terminal from being supplied to the back end circuit through the third controllable switch T3 and the voltage output terminal VOUT, thereby achieving the protection circuit. purpose.

Please refer to FIG. 2, which is a circuit diagram of a second embodiment of the anti-reverse and current sink circuit of the present invention. As shown in FIG. 2, the second embodiment of the anti-reverse and current sink circuit differs from the first embodiment of the anti-reverse and current sink circuit in that: the fourth controllable switch T4 is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch T4 respectively correspond to a base, a collector and an emitter of the NPN-type transistor; the fifth controllable switch T5 For the PNP type transistor, the control end, the first end and the second end of the fifth controllable switch T5 respectively correspond to the base, the emitter and the collector of the PNP type transistor.

Please refer to FIG. 3, which is a circuit diagram of a third embodiment of the anti-reverse and current sink circuit of the present invention. As shown in FIG. 3, the third embodiment of the anti-reverse and current sink circuit differs from the first embodiment of the anti-reverse and current sink circuit in that the output circuit 30 includes a fourth resistor R4, a fourth controllable switch T4 and a fifth controllable switch T5, a second diode D2 and a third diode D3, the first end of the fourth resistor R4 is connected to the voltage input terminal VCC, The second end of the fourth resistor R4 is connected to the control end of the fourth controllable switch T4, the control end of the fifth controllable switch T5, and the first end of the fifth controllable switch T5. a first end of the fourth controllable switch T4 is connected to the second end of the first resistor R1, and a second end of the fourth controllable switch T4 is connected to the anode of the second diode D2, the second a cathode of the diode D2 is connected to the second end of the third controllable switch T3, and a second end of the fifth controllable switch T5 is connected to the anode of the third diode D3, the third diode The cathode of the tube D3 is connected to the second input and the first end of the third controllable switch T3.

In this embodiment, the fourth controllable switch T4 is an NPN-type triode, and the control end, the first end, and the second end of the fourth controllable switch T4 respectively correspond to a base and a set of the NPN-type triode An electrode and an emitter; the fifth controllable switch T5 is an NPN type transistor, and the control end, the first end and the second end of the fifth controllable switch T5 respectively correspond to a base and a collector of the NPN transistor And the emitter.

Please refer to FIG. 4, which is a circuit diagram of a fourth embodiment of the anti-reverse and current sink circuit of the present invention. As shown in FIG. 4, the fourth embodiment of the anti-reverse and current sink circuit is different from the third embodiment of the anti-reverse and current sink circuit in that: the fourth controllable switch T4 is an NPN-type triode, and the control end, the first end and the second end of the fourth controllable switch T4 respectively correspond to a base, a collector and an emitter of the NPN-type transistor; the fifth controllable switch T5 For the NPN type transistor, the control end, the first end and the second end of the fifth controllable switch T5 respectively correspond to the base, the emitter and the collector of the NPN type transistor.

The working principles of the second to fourth embodiments of the anti-reverse and current reversal circuit are the same as those of the first embodiment, and will not be further described herein.

The anti-reverse connection and current back-flux circuit provides first and second control signals through the control circuit to control whether the switch circuit is turned on or off, thereby controlling whether the output circuit supplies a voltage to the back-end circuit to satisfy High-power power requirements reduce costs at the same time and can shut down the circuit in time to prevent damage to the power supply and back-end circuits caused by reverse power supply or current back-up.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (17)

1. An anti-reverse connection and current reverse irrigation circuit, wherein the anti-reverse connection and current reverse irrigation circuit comprises:

   a voltage input terminal connected to the first input terminal for receiving an input voltage;

   a voltage output end connected to the back end circuit for outputting a voltage to the back end circuit;

   a control circuit, connected to the voltage input terminal and the voltage output terminal, for receiving a voltage from the voltage input terminal and outputting a first control signal or a second control signal;

   a switching circuit, connected to the control circuit, the voltage output end and the second input end, for receiving the first control signal or the second control signal from the control circuit, the switch circuit receiving the Turning on when a control signal is turned on, and the switch circuit is turned off when receiving the second control signal;

   An output circuit connecting the voltage input terminal, the control circuit, the switch circuit, the voltage output terminal and the second input terminal, when the first input terminal is connected to a positive pole of the power source and the second input When the terminal is connected to the negative pole of the power source, the control circuit outputs the first control signal to the switch circuit, the switch circuit is turned on, and the power source passes through the output circuit, the switch circuit, and the voltage Outputting an output voltage to the back end circuit; when the first input terminal is connected to a negative pole of the power source and the second input end is connected to a positive pole of the power source or a short circuit of a power source connected to the first and second input terminals The output circuit pulls down the voltage supplied to the control circuit by the voltage input terminal such that the control circuit outputs the second control signal to the switch circuit, the switch circuit is turned off, the second input The voltage at the terminal and the sink current are not supplied to the back end circuit through the switching circuit and the voltage output terminal.
2. The anti-reverse and current sinking circuit of claim 1 , wherein the control circuit comprises first and second resistors, first and second controllable switches, and the first end of the first resistor is connected to a voltage input end, a second end of the first resistor is connected to a control end of the first controllable switch, a first end of the first controllable switch is connected to the voltage input end, and the first controllable a second end of the switch is connected to the second end of the second controllable switch and the switch circuit, and a first end of the second controllable switch is connected to the switch circuit and the voltage output end, the second The control end of the controllable switch is connected to the control end of the first controllable switch and the first end of the second resistor, and the second end of the second resistor is connected to the switch circuit and the voltage output end.
3. The anti-reverse connection and current reverse irrigation circuit according to claim 2, wherein the first controllable switch is an NPN type triode, and the control end, the first end and the second end of the first controllable switch respectively correspond to a base, a collector and an emitter of the NPN transistor; the second controllable switch is a PNP type transistor, and the control end, the first end and the second end of the second controllable switch respectively correspond to the PNP The base, collector and emitter of the transistor.
4. The anti-reverse and current reverse sink circuit according to claim 2, wherein the switch circuit comprises a third resistor, a third controllable switch and a first diode, and the control end of the third controllable switch The third resistor is connected to the second ends of the first and second controllable switches, and the second end of the third controllable switch is connected to the first end of the second controllable switch, the second resistor The second end of the third controllable switch is connected to the second input end, and the anode of the first diode is connected to the second end of the third controllable switch The cathode of the first diode is connected to the first end of the third controllable switch.
5. The anti-reverse connection and current reverse irrigation circuit according to claim 4, wherein the third controllable switch is an N-type MOS field effect transistor, and the control end, the first end and the second end of the third controllable switch The terminals respectively correspond to the gate, the drain and the source of the N-type MOS field effect transistor.
6. The anti-reverse and current sinking circuit of claim 4, wherein the output circuit comprises a fourth resistor, fourth and fifth controllable switches, second and third diodes, and the fourth resistor The first end is connected to the voltage input end, the second end of the fourth resistor is connected to the control end of the fourth controllable switch, and the first end of the fourth controllable switch is connected to the first resistor a second end, a second end of the fourth controllable switch is connected to an anode of the second diode, and a cathode of the second diode is connected to a second end of the third controllable switch a second end of the fifth controllable switch is connected to the second end of the fourth resistor and a control end of the fourth controllable switch, and a control end of the fifth controllable switch is connected to the fifth controllable switch The first end is coupled to the anode of the third diode, and the cathode of the third diode is coupled to the second input and the first end of the third controllable switch.
7. The anti-reverse connection and current reverse irrigation circuit according to claim 6, wherein the fourth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN transistor; the fifth controllable switch is a PNP type transistor, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to the PNP The base, collector and emitter of the transistor.
8. The anti-reverse connection and current reverse irrigation circuit according to claim 6, wherein the fourth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN transistor; the fifth controllable switch is a PNP type transistor, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to the PNP The base, emitter and collector of the transistor.
9. The anti-reverse and current sinking circuit of claim 4, wherein the output circuit comprises a fourth resistor, fourth and fifth controllable switches, second and third diodes, and the fourth resistor The first end is connected to the voltage input end, and the second end of the fourth resistor is connected to the control end of the fourth controllable switch, the control end of the fifth controllable switch, and the fifth controllable switch The first end of the fourth controllable switch is connected to the second end of the first resistor, and the second end of the fourth controllable switch is connected to the anode of the second diode. a cathode of the second diode is connected to the second end of the third controllable switch, and a second end of the fifth controllable switch is connected to an anode of the third diode, the third diode The cathode is coupled to the second input and the first end of the third controllable switch.
10. The anti-reverse connection and current reverse irrigation circuit according to claim 9, wherein the fourth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type transistor; the fifth controllable switch is an NPN-type transistor, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to the NPN The base, collector and emitter of the transistor.
11. The anti-reverse connection and current reverse irrigation circuit according to claim 9, wherein the fourth controllable switch is an NPN type triode, and the control end, the first end and the second end of the fourth controllable switch respectively correspond to a base, a collector and an emitter of the NPN-type transistor; the fifth controllable switch is an NPN-type transistor, and the control end, the first end and the second end of the fifth controllable switch respectively correspond to the NPN The base, emitter and collector of the transistor.
12. The anti-reverse and current sinking circuit according to claim 6 or 9, wherein the output circuit further comprises a fourth diode, and an anode of the fourth diode is connected to the second of the fourth resistor The cathode of the fourth diode is connected to the second end of the first resistor.
13. The anti-reverse and current sinking circuit according to claim 6 or 9, wherein the output circuit further comprises a first capacitor, the first end of the first capacitor is connected to the voltage input end, the first A second end of the capacitor is coupled to the second end of the third controllable switch.
14. The anti-reverse and current sink circuit of claim 1 , wherein the anti-reverse and current sink circuit further comprises an auxiliary source, the input of the auxiliary source being connected to the first input, An output of the auxiliary source is coupled to the voltage input.
15. The anti-reverse connection and current sinking circuit of claim 1 , wherein the anti-reverse and current sink circuit further comprises a slow start circuit, the slow start circuit being connected to the first input end and the Between the voltage outputs.
16. The anti-reverse and current sinking circuit of claim 1 , wherein the anti-reverse and current sink circuit further comprises a DC voltage conversion circuit, the DC voltage conversion circuit being coupled to the slow start circuit.
17. The anti-reverse and current sinking circuit of claim 1 , wherein the anti-reverse and current sink circuit further comprises a second capacitor connected to the slow start circuit and the DC Between voltage conversion circuits.