A bidirectional output control circuit for an AC / DC conversion module

Abstract

The invention discloses a bidirectional output control circuit of an AC / DC conversion module, comprising a seventh resistor, a fourteenth resistor, a second optical coupling module, a sixth optical coupling module, a first triode, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, an eighth triode, a ninth triode, a load resistor, a first connection end, a second connection end, a first triode base connected with a ninth triode base and the first connection end, a first triode collector, a fourth MOS tube drain, a fifth MOS tube source connected with a power supply, a first triode emitter connected with a fourth MOS tube grid and a fifth MOS tube grid, and a fifth MOS tube drain connected with a first pin of the sixth optical coupling module.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to a bidirectional output control circuit of an AC / DC conversion module. Background Art

[0002] AC-DC can obtain DC power with a frequency times higher than AC and a stable amplitude through full-bridge rectification. However, the existing scheme can only perform unidirectional output after the AC-DC conversion, which cannot meet the needs of devices that require bidirectional current for driving and powering. Publication No.: CN217240687U discloses a bidirectional output circuit, which does not require two analog-to-digital conversion chip combinations for power supply, but is completed through an amplifier circuit and a drive output circuit connected in series. After the control signal is input into the circuit, it enters the amplifier circuit for amplification, and then enters the drive output circuit to obtain a bidirectional output current, which is output to the load resistance to achieve bidirectional control of the output current. However, the problem is that it cannot suppress power supply fluctuations during use, and the accuracy is low. In addition, the voltage application range is limited by the voltage resistance performance of the components, and the cost of replacing them is too high. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide a bidirectional output control circuit of an AC / DC conversion module, including a seventh resistor R7, a fourteenth resistor R14, a second optical coupling module U2, a sixth optical coupling module U6, a first transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5, an eighth transistor Q8, a ninth transistor Q9, a load resistor RL, a first connection terminal P1, and a second connection terminal P2. The base of the first transistor Q1 is connected to the base of the ninth transistor Q9 and the first connection terminal P1. The collector of the first transistor Q1, the drain of the fourth MOS transistor Q4, and the source of the fifth MOS transistor Q5 are connected to a power supply. The emitter of the first transistor Q1 is connected to the gate of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5. The drain of the fifth MOS transistor Q5 is connected to the first pin of the sixth optical coupling module U6. The source of the fourth MOS transistor Q4 is connected to the gate of the fifth MOS transistor Q5. The first pin of the second optocoupler module U2 is connected, one end of the load resistor RL is connected to the source of the third MOS tube Q3 and the third pin of the second optocoupler module U2, the drain of the third MOS tube Q3 is connected to one end of the fourteenth resistor R14, the source of the second MOS tube Q2 and the ground, the drain of the second MOS tube Q2 is connected to the other end of the load resistor RL and the third pin of the sixth optocoupler module U6, the collector of the eighth transistor Q8 is connected to the other end of the fourteenth resistor R14 and one end of the seventh resistor R7, the emitter of the eighth transistor Q8 is connected to the fourth pin of the second optocoupler module U2 and the fourth pin of the sixth optocoupler module U6, the other end of the seventh resistor R7 is connected to the second connection end P2 and the collector of the ninth transistor Q9, the emitter of the ninth transistor Q9 is connected to the gate of the second MOS tube Q2 and the gate of the third MOS tube Q3, and the second pin of the second optocoupler module U2, the second pin of the sixth optocoupler module U6 and the ground are connected.

[0004] Furthermore, it also includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a ninth resistor R9, a tenth resistor R10, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a nineteenth resistor R19, a twentieth resistor R20, a first operational amplifier U1, a third voltage stabilizing chip U3, a fourth operational amplifier U4, a fifth digital potentiometer U5, an eighth digital potentiometer U8, and a seventh digital potentiometer U7, wherein one end of the fifth resistor R5 and one end of the sixth resistor R6 are connected to the power supply, and the other end of the fifth resistor R5 is connected to one end of the third resistor R3, the fourth operational amplifier U4, the fifth digital potentiometer U5, the eighth digital potentiometer U8, and the seventh digital potentiometer U7. The control electrode of the third voltage stabilizing chip U3 is connected, the other end of the sixth resistor R6 is connected to the cathode of the third voltage stabilizing chip U3, the first pin of the eighth digital potentiometer U8, the first pin of the fifth digital potentiometer U5, the third pin of the fifth digital potentiometer U5, the first pin of the seventh digital potentiometer U7, and one end of the seventeenth resistor R17, the third pin of the eighth digital potentiometer U8, the fifth pin of the eighth digital potentiometer U8 are connected to the second connection end P2, the seventh pin of the eighth digital potentiometer U8 is connected to the seventh pin of the fifth digital potentiometer U5, the second pin of the eighth digital potentiometer U8 is connected to the second pin of the fifth digital potentiometer U5, the sixth pin of the eighth digital potentiometer U8 is connected One end of the second resistor R2, one end of the ninth resistor R9, and one end of the tenth resistor R10 are connected, the fifth pin of the fifth digital potentiometer U5, the sixth pin of the fifth digital potentiometer U5, one end of the first resistor R1, and the inverting end of the first operational amplifier U1 are connected, the non-inverting end of the first operational amplifier U1 is connected to the other end of the tenth resistor R10 and one end of the fifteenth resistor R15, the output end of the first operational amplifier U1 is connected to one end of the sixteenth resistor R16 and the second pin of the seventh digital potentiometer U7, the seventh pin of the seventh digital potentiometer U7 is connected to one end of the nineteenth resistor R19, the fifth pin of the seventh digital potentiometer U7, the sixth pin of the seventh digital potentiometer U7 and the One end of the fourth resistor R4 is connected to the inverting end of the fourth operational amplifier U4, the non-inverting end of the fourth operational amplifier U4 is connected to the other end of the seventeenth resistor R17 and one end of the twentieth resistor R20, the output end of the fourth operational amplifier U4 is connected to the third pin of the seventh digital potentiometer U7 and the base of the eighth transistor Q8, the other end of the first resistor R1, the other end of the second resistor R2, the other end of the third resistor R3, the other end of the fourth resistor R4, the other end of the ninth resistor R9, the other end of the fifteenth resistor R15, the other end of the sixteenth resistor R16, the other end of the nineteenth resistor R19, the other end of the twentieth resistor R20, the anode of the third voltage stabilizing chip U3 and the ground end are connected.

[0005] Furthermore, it also includes a first switch SW1, a second switch SW2, a first diode D1, a sixth transistor Q6, a seventh transistor Q7, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. One end of the first switch SW1, one end of the second switch SW2, the emitter of the sixth transistor Q6, the collector of the seventh transistor Q7, and the other end of the sixth resistor R6 are connected. The other end of the first switch SW1 is connected to the cathode of the first diode D1 and the base of the seventh transistor Q7. The emitter of the seventh transistor Q7 is connected to one end of the twelfth resistor R12 and the base of the sixth transistor Q6. The collector of the sixth transistor Q6 is connected to one end of the eleventh resistor R11 and the seventh pin of the fifth digital potentiometer U5. The other end of the second switch SW2 is connected to the anode of the first diode D1, one end of the thirteenth resistor R13, and the second pin of the fifth digital potentiometer U5. The other end of the eleventh resistor R11, the other end of the twelfth resistor R12, and the other end of the thirteenth resistor R13 are connected to the ground.

[0006] Furthermore, a twenty-first resistor R21 is included, one end of the twenty-first resistor R21 is connected to the emitter of the first transistor Q1, and the other end of the twenty-first resistor R21 is connected to the ground.

[0007] Furthermore, an eighth resistor R8 is included, one end of the eighth resistor R8 is connected to the gate of the third MOS transistor Q3, and the other end of the eighth resistor R8 is connected to the ground.

[0008] Furthermore, it also includes a third switch SW3, one end of the third switch SW3 is connected to the first pin of the seventh digital potentiometer U7, and the other end of the third switch SW3 is connected to the seventh pin of the seventh digital potentiometer U7.

[0009] Furthermore, it also includes a second light emitting diode D2, wherein the anode of the second light emitting diode D2 is connected to one end of the nineteenth resistor R19, and the cathode of the second light emitting diode D2 is connected to the ground end.

[0010] The beneficial effects of the present invention compared with the prior art are:

[0011] It has a bidirectional output switching function, which can separate the sampling voltage and the power supply voltage during output regulation to increase the voltage application range. At the same time, when the voltage fluctuates, it can automatically compensate the actual power supply voltage according to the fluctuation situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 This is a circuit structure diagram provided by the present invention. DETAILED DESCRIPTION

[0014] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0015] The present invention discloses a bidirectional output control circuit of an AC / DC conversion module, comprising a seventh resistor R7, a fourteenth resistor R14, a second optical coupling module U2, a sixth optical coupling module U6, a first transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5, an eighth transistor Q8, a ninth transistor Q9, a load resistor RL, a first connection terminal P1, and a second connection terminal P2. The base of the first transistor Q1 is connected to the base of the ninth transistor Q9 and the first connection terminal P1. The collector of the first transistor Q1, the drain of the fourth MOS transistor Q4, and the source of the fifth MOS transistor Q5 are connected to a power supply. The emitter of the first transistor Q1 is connected to the gate of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5. The drain of the fifth MOS transistor Q5 is connected to the first pin of the sixth optical coupling module U6. The source of the fourth MOS transistor Q4 and the second optical coupling module The first pin of the sixth optocoupler module U6 is connected to the first pin of the eighth transistor Q8, one end of the load resistor RL is connected to the source of the third MOS tube Q3 and the third pin of the second optocoupler module U2, the drain of the third MOS tube Q3 is connected to one end of the fourteenth resistor R14, the source of the second MOS tube Q2 and the ground, the drain of the second MOS tube Q2 is connected to the other end of the load resistor RL and the third pin of the sixth optocoupler module U6, the collector of the eighth transistor Q8 is connected to the other end of the fourteenth resistor R14 and one end of the seventh resistor R7, the emitter of the eighth transistor Q8 is connected to the fourth pin of the second optocoupler module U2 and the fourth pin of the sixth optocoupler module U6, the other end of the seventh resistor R7 is connected to the second connection end P2 and the collector of the ninth transistor Q9, the emitter of the ninth transistor Q9 is connected to the gate of the second MOS tube Q2 and the gate of the third MOS tube Q3, and the second pin of the second optocoupler module U2, the second pin of the sixth optocoupler module U6 and the ground are connected.

[0016] Specifically, it also includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a ninth resistor R9, a tenth resistor R10, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a nineteenth resistor R19, a twentieth resistor R20, a first operational amplifier U1, a third voltage stabilizing chip U3, a fourth operational amplifier U4, a fifth digital potentiometer U5, an eighth digital potentiometer U8, and a seventh digital potentiometer U7. One end of the fifth resistor R5 and one end of the sixth resistor R6 are connected to the power supply, and the other end of the fifth resistor R5 is connected to one end of the third resistor R3 and the third The control electrode of the voltage stabilizing chip U3 is connected, the other end of the sixth resistor R6 is connected to the cathode of the third voltage stabilizing chip U3, the first pin of the eighth digital potentiometer U8, the first pin of the fifth digital potentiometer U5, the third pin of the fifth digital potentiometer U5, the first pin of the seventh digital potentiometer U7, and one end of the seventeenth resistor R17 are connected, the third pin of the eighth digital potentiometer U8, the fifth pin of the eighth digital potentiometer U8 are connected to the second connection end P2, the seventh pin of the eighth digital potentiometer U8 is connected to the seventh pin of the fifth digital potentiometer U5, the second pin of the eighth digital potentiometer U8 is connected to the second pin of the fifth digital potentiometer U5, the sixth pin of the eighth digital potentiometer U8 is connected to the The first operational amplifier U1 is connected to the output terminal of the first digital potentiometer U1, and the output terminal of the first operational amplifier U1 is connected to the first end of the first resistor R16, and the second pin of the seventh digital potentiometer U7 is connected. The seventh pin of the seventh digital potentiometer U7 is connected to the first end of the first resistor R19, and the fifth pin of the seventh digital potentiometer U7 is connected to the first end of the first resistor R18, and the sixth pin of the seventh digital potentiometer U7 is connected to the second end of the first resistor R20, the ninth end of the ninth resistor R9, and the tenth end of the tenth resistor R10. The fifth pin of the fifth digital potentiometer U5, the sixth pin of the fifth digital potentiometer U5, and the first end of the first resistor R19 are connected. One end of the fourth resistor R4 is connected to the inverting end of the fourth operational amplifier U4, the non-inverting end of the fourth operational amplifier U4 is connected to the other end of the seventeenth resistor R17 and one end of the twentieth resistor R20, the output end of the fourth operational amplifier U4 is connected to the third pin of the seventh digital potentiometer U7 and the base of the eighth transistor Q8, the other end of the first resistor R1, the other end of the second resistor R2, the other end of the third resistor R3, the other end of the fourth resistor R4, the other end of the ninth resistor R9, the other end of the fifteenth resistor R15, the other end of the sixteenth resistor R16, the other end of the nineteenth resistor R19, the other end of the twentieth resistor R20, the anode of the third voltage stabilizing chip U3 and the ground end are connected.

[0017] Specifically, it also includes a first switch SW1, a second switch SW2, a first diode D1, a sixth transistor Q6, a seventh transistor Q7, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. One end of the first switch SW1, one end of the second switch SW2, the emitter of the sixth transistor Q6, the collector of the seventh transistor Q7, and the other end of the sixth resistor R6 are connected. The other end of the first switch SW1 is connected to the cathode of the first diode D1 and the base of the seventh transistor Q7. The emitter of the seventh transistor Q7 is connected to one end of the twelfth resistor R12 and the base of the sixth transistor Q6. The collector of the sixth transistor Q6 is connected to one end of the eleventh resistor R11 and the seventh pin of the fifth digital potentiometer U5. The other end of the second switch SW2 is connected to the anode of the first diode D1, one end of the thirteenth resistor R13, and the second pin of the fifth digital potentiometer U5. The other end of the eleventh resistor R11, the other end of the twelfth resistor R12, and the other end of the thirteenth resistor R13 are connected to the ground.

[0018] Specifically, a twenty-first resistor R21 is also included, one end of the twenty-first resistor R21 is connected to the emitter of the first transistor Q1, and the other end of the twenty-first resistor R21 is connected to the ground.

[0019] Specifically, an eighth resistor R8 is also included, one end of the eighth resistor R8 is connected to the gate of the third MOS tube Q3, and the other end of the eighth resistor R8 is connected to the ground end.

[0020] Specifically, it also includes a third switch SW3, one end of the third switch SW3 is connected to the first pin of the seventh digital potentiometer U7, and the other end of the third switch SW3 is connected to the seventh pin of the seventh digital potentiometer U7.

[0021] Specifically, it also includes a second light emitting diode D2, wherein the anode of the second light emitting diode D2 is connected to one end of the nineteenth resistor R19, and the cathode of the second light emitting diode D2 is connected to the ground end.

[0022] The first connection terminal P1 is used to input a switching signal, and the second connection terminal P2 is used to connect to a power supply. When the first connection terminal P1 inputs a signal during switching, the first transistor Q1 and the ninth transistor Q9 are turned on, and the power signal is fed back to the fourth MOS transistor Q4 and the fifth MOS transistor Q5 through the first transistor Q1, the fifth MOS transistor Q5 is turned off, and the fourth MOS transistor Q4 is turned on. At the same time, the power supply is fed back to the second MOS transistor Q2 through the fifth MOS transistor Q5, and the fourth MOS transistor Q4 is turned on to couple the second optical coupling module U2. At the same time, the power supply of the second connection terminal P2 is divided by the seventh resistor R7 and the fourteenth resistor R14, and then fed back to the eighth transistor Q8 and the second optical coupling module U 2. The load resistor RL and the second MOS tube Q2 loop, the fourteenth resistor R14 divides the positive and negative voltage difference of the second MOS tube Q2 and the third MOS tube Q3 into normal ones. When switching again, there is no signal at the first connection terminal P1, the fourth MOS tube Q4 is turned off, the fifth MOS tube Q5 is turned on, and at the same time, the ninth transistor Q9 and the second MOS tube Q2 are turned off, and the third MOS tube Q3 is turned on. After the sixth optical coupling module U6 is coupled, the second connection terminal P2 signal passes through the seventh resistor R7, the eighth transistor Q8, the sixth optical coupling module U6, the Q load resistor RL, and the third MOS tube Q3 loop, and controls the base of the eighth transistor Q8 to adjust the actual output current, thereby completing the output switching.

[0023] Taking into account the power supply fluctuation problem and the low applicable range of the load, the signal of the second connection terminal P2 is also fed back to the eighth digital potentiometer U8, and is first divided by the eighth digital potentiometer U8 and the second resistor R2, and then fed back to the first operational amplifier U1 in-phase terminal through the tenth resistor R10 and the fifteenth resistor R15 loop. The eighth digital potentiometer U8 and the fifth digital potentiometer U5 adjustment pins are connected in parallel, and the coefficient of the eighth digital potentiometer U8 and the second resistor R2 is used to proportionally reduce the power supply signal. The tenth resistor R10 and the fifteenth resistor R15 are used to divide the signal with the eighth digital potentiometer U8. Synchronized with the first resistor R1, for example, assuming that the voltage input at the second connection terminal P2 is X, after passing through the eighth digital potentiometer U8 and the second resistor R2, it is X / (eighth digital potentiometer U8+second resistor R2)*second resistor R2=Y, the power supply of the fifth digital potentiometer U5 is fed back to a pin of the third voltage regulator chip U3 through the fifth resistor R5 and the third resistor R3, and then fed back to the fifth digital potentiometer U5 through the sixth resistor R6, and then the cathode terminal voltage of the third voltage regulator chip U3 supplies power to the eighth digital potentiometer U8, the fifth digital potentiometer U5, and the seventh digital potentiometer U7. Assuming The voltage Z of the third voltage stabilizing chip U3 is fed back to the first operational amplifier U1 after being equally divided by the first resistor R1. The voltage Y at the end of the ninth resistor R9 is fed back to the first operational amplifier U1 after being equally divided by the tenth resistor R10 and the fifteenth resistor R15. When the eighth digital potentiometer U8 is adjusted, the fifth digital potentiometer U5 is adjusted synchronously. The output of the first operational amplifier U1 is fed back to the seventh digital potentiometer U7. After the seventh digital potentiometer U7 forms negative feedback with the fourth resistor R4, the fourth operational amplifier U4 amplifies the output. After the fourth operational amplifier U4 outputs the amplified value of the eighth transistor Q8, the output of the eighth digital potentiometer U8 is fed back to the seventh digital potentiometer U7. Current, if there is fluctuation at the second connection terminal P2 so that X≠Y, when it is greater than, the first operational amplifier U1 outputs the seventh digital potentiometer U7 for adjustment, reducing the feedback coefficient of the fourth operational amplifier U4; if it is less than, the first operational amplifier U1 is cut off, and the seventh digital potentiometer U7 reversely adjusts to increase the feedback coefficient of the fourth operational amplifier U4. The fourth operational amplifier U4 amplifies the current at the output of the eighth transistor Q8 to make the voltage at the second connection terminal P2 approach the same as the adjustment, thereby separating the low-amplitude sampling voltage for detecting fluctuations and the high-amplitude second connection terminal P2 to increase the applicable range and prevent fluctuations.

[0024] Consider the control synchronization and optimization of the fifth digital potentiometer U5 and the eighth digital potentiometer U8, wherein the first switch SW1 is for upward adjustment and the second switch SW2 is for downward adjustment. When the first switch SW1 is pressed, the seventh transistor Q7 is turned on and the sixth transistor Q6 is turned off. The seven pins of the fifth digital potentiometer U5 and the eighth digital potentiometer U8 are started after being pulled down by the eleventh resistor R11. The two pins of the eighth digital potentiometer U8 and the fifth digital potentiometer U5 are adjusted after being looped through the thirteenth resistor R13. If the second switch SW2 is pressed, the signal is fed back to the seventh transistor Q7 through the first diode D1, and the sixth transistor Q6 is turned off. At the same time, the two pin states of the fifth digital potentiometer U5 and the eighth digital potentiometer U8 are changed, and the eighth digital potentiometer U8 and the fifth digital potentiometer U5 are reversely adjusted. When there is no input, the sixth transistor Q6 is looped through the twelfth resistor R12, and the eighth digital potentiometer U8 and the fifth digital potentiometer U5 are turned off. The eighth resistor R8 is used for the gate loop of the second MOS tube Q2 and the third MOS tube Q3, the twenty-first resistor R21 is used for the gate loop of the fourth MOS tube Q4 and the fifth MOS tube Q5, the third switch SW3 is used to disable the inhibition function when pressed, and the second light-emitting diode D2 is used for status indication.

[0025] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A bidirectional output control circuit of an AC / DC conversion module, characterized in that: The invention comprises a seventh resistor, a fourteenth resistor, a second optical coupling module, a sixth optical coupling module, a first triode, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, an eighth triode, a ninth triode, a load resistor, a first connection end, and a second connection end. The base of the first triode is connected to the base of the ninth triode and the first connection end. The collector of the first triode, the drain of the fourth MOS tube, the source of the fifth MOS tube and the power supply are connected. The emitter of the first triode is connected to the gate of the fourth MOS tube and the gate of the fifth MOS tube. The drain of the fifth MOS tube is connected to the first pin of the sixth optical coupling module. The source of the fourth MOS tube is connected to the first pin of the second optical coupling module. One end of the load resistor is connected to the source of the third MOS tube and the third pin of the second optical coupling module. The drain of the third MOS tube is connected to one end of the fourteenth resistor and the second MOS tube. The source of the transistor is connected to the ground terminal, the drain of the second MOS transistor is connected to the other end of the load resistor and the third pin of the sixth optocoupler module, the collector of the eighth transistor is connected to the other end of the fourteenth resistor and one end of the seventh resistor, the emitter of the eighth transistor is connected to the fourth pin of the second optocoupler module and the fourth pin of the sixth optocoupler module, the other end of the seventh resistor is connected to the second connection terminal and the collector of the ninth transistor, the emitter of the ninth transistor is connected to the gate of the second MOS transistor and the gate of the third MOS transistor, the second pin of the second optocoupler module, the second pin of the sixth optocoupler module and the ground terminal are connected, the first connection terminal is used to input a switching signal, the second connection terminal is used to connect to a power supply, the signal state of the first connection terminal controls the third MOS transistor and the second optocoupler module or the second MOS transistor and the sixth optocoupler module to be turned on, and switches the loop direction of the power supply feedback from the second connection terminal to the load; It also includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a ninth resistor, a tenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a nineteenth resistor, a twentieth resistor, a first operational amplifier, a third voltage stabilizing chip, a fourth operational amplifier, a fifth digital potentiometer, an eighth digital potentiometer, and a seventh digital potentiometer. One end of the fifth resistor and one end of the sixth resistor are connected to a power supply, the other end of the fifth resistor is connected to one end of the third resistor and the control electrode of the third voltage stabilizing chip, the other end of the sixth resistor is connected to the cathode of the third voltage stabilizing chip, the first pin of the eighth digital potentiometer, the first pin of the fifth digital potentiometer, the third pin of the fifth digital potentiometer, the first pin of the seventh digital potentiometer, and one end of the seventeenth resistor are connected, the third pin of the eighth digital potentiometer, the fifth pin of the eighth digital potentiometer and the second connection end are connected, the seventh pin of the eighth digital potentiometer is connected to the seventh pin of the fifth digital potentiometer, the second pin of the eighth digital potentiometer is connected to the second pin of the fifth digital potentiometer, the sixth pin of the eighth digital potentiometer and one end of the second resistor, one end of the ninth resistor and one end of the tenth resistor, the fifth pin of the fifth digital potentiometer, the sixth pin of the fifth digital potentiometer and one end of the first resistor, the first operational amplifier, the fifth operational amplifier, the fifth operational amplifier, the sixth pin of the eighth digital potentiometer and one end of the first resistor, the ninth resistor and one end of the tenth resistor, The inverting end of the amplifier is connected, the in-phase end of the first operational amplifier is connected to the other end of the tenth resistor and one end of the fifteenth resistor, the output end of the first operational amplifier is connected to one end of the sixteenth resistor and the second pin of the seventh digital potentiometer, the seventh pin of the seventh digital potentiometer is connected to one end of the nineteenth resistor, the fifth pin of the seventh digital potentiometer, the sixth pin of the seventh digital potentiometer, one end of the fourth resistor, and the inverting end of the fourth operational amplifier are connected, the in-phase end of the fourth operational amplifier is connected to the other end of the seventeenth resistor and one end of the twentieth resistor, the output end of the fourth operational amplifier is connected to the third pin of the seventh digital potentiometer and the base of the eighth transistor , the other end of the first resistor, the other end of the second resistor, the other end of the third resistor, the other end of the fourth resistor, the other end of the ninth resistor, the other end of the fifteenth resistor, the other end of the sixteenth resistor, the other end of the nineteenth resistor, the other end of the twentieth resistor, the anode of the third voltage regulator chip and the ground terminal are connected, the power signal of the second connection end is fed back to the eighth digital potentiometer, the third voltage regulator chip is fed back to the fifth digital potentiometer and the seventh digital potentiometer after voltage stabilization, the first operational amplifier automatically controls the negative feedback voltage input to the fourth operational amplifier by the seventh operational amplifier after comparison, and the fourth operational amplifier outputs the base current of the eighth transistor; It also includes a first switch, a second switch, a first diode, a sixth transistor, a seventh transistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor. One end of the first switch, one end of the second switch, the emitter of the sixth transistor, the collector of the seventh transistor and the other end of the sixth resistor are connected. The other end of the first switch is connected to the cathode of the first diode and the base of the seventh transistor. The emitter of the seventh transistor is connected to one end of the twelfth resistor and the base of the sixth transistor. The collector of the sixth transistor is connected to one end of the eleventh resistor and the seventh pin of the fifth digital potentiometer. The other end of the second switch is connected to the anode of the first diode, one end of the thirteenth resistor and the second pin of the fifth digital potentiometer. The other end of the eleventh resistor, the other end of the twelfth resistor and the other end of the thirteenth resistor are connected to the ground. After the first switch is pressed, the sixth transistor is cut off, and the collector has no output to start the eighth digital potentiometer and the fifth digital potentiometer. After the second switch is pressed, the adjustment direction of the eighth digital potentiometer and the fifth digital potentiometer is changed and fed back to the input voltage range of the first operational amplifier.

2. The bidirectional output control circuit of the AC / DC conversion module according to claim 1, characterized in that: It also includes a twenty-first resistor, one end of which is connected to the emitter of the first transistor, and the other end of the twenty-first resistor is connected to the ground end. After the first connection end is input, the gate junction capacitance of the fourth MOS tube and the fifth MOS tube is quickly discharged through the twenty-first resistor.

3. The bidirectional output control circuit of the AC / DC conversion module according to claim 1, characterized in that: It also includes an eighth resistor, one end of the eighth resistor is connected to the gate of the third MOS tube, and the other end of the eighth resistor is connected to the ground end. After the ninth transistor is turned on, the gate junction capacitance of the second MOS tube and the third MOS tube is quickly discharged through the eighth resistor.

4. The bidirectional output control circuit of the AC / DC conversion module according to claim 1, characterized in that: It also includes a third switch, one end of the third switch is connected to the first pin of the seventh digital potentiometer, and the other end of the third switch is connected to the seventh pin of the seventh digital potentiometer. When the third switch is pressed, the seventh digital potentiometer is turned off and the function of suppressing the fluctuation of the input power supply at the second connection end is disabled.

5. The bidirectional output control circuit of the AC / DC conversion module according to claim 1, characterized in that: It also includes a second light emitting diode, wherein the anode of the second light emitting diode is connected to one end of the nineteenth resistor, the cathode of the second light emitting diode is connected to the ground end, and the second light emitting diode indicates the current start / stop state of the seventh digital potentiometer.

Images