Positive and negative direct current double-voltage input reverse connection prevention protection control circuit

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By designing a circuit including a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module, the problem that the prior art cannot effectively realize anti-reverse protection under the dual voltage input of positive and negative DC, and realize the load cut-off when the power input is connected incorrectly and the provision of multiple protection functions.

CN119602206APending Publication Date: 2025-03-11HEFEI TONGZHI ELECTRICAL CONTROL TECH

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Patent Information

Application Number: CN202411537403.X
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-10-31
Publication Date: 2025-03-11

AI Technical Summary

Technical Problem

The prior art cannot effectively realize anti-reverse protection in the case of positive and negative DC dual voltage input, cannot accurately identify positive power, negative power or reference power, and there are multiple possible connection combinations, which makes the control logic difficult to handle.

Method used

A circuit including a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module is designed. Through the combination of diodes and resistors, the accurate judgment and processing of positive and negative DC dual voltage inputs are achieved to ensure that the correct anti-reverse protection is provided under any circumstances.

Benefits of technology

It realizes the load power supply when the power input is connected incorrectly under the conditions of positive and negative DC dual voltage input, and provides anti-reverse protection functions. It also has current limiting, undervoltage and overvoltage protection functions, which are suitable for a variety of voltage systems and strong electromagnetic interference environments.

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Abstract

The invention provides a positive and negative direct current double-voltage input reverse connection prevention protection control circuit, which comprises a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module, and is characterized in that the polarity judgment module comprises diodes V1, V4 and V9; all forms of power supply polarity access of the point A, the point B and the point C are determined through unilateral conductivity of diodes V1, V4 and V9; the voltage judgment module comprises a resistor R6, a resistor R12 and a voltage reference power supply V8; by adjusting the resistance values of a resistor R6 and a resistor R12 which are connected in series, the reference voltage of a voltage reference power supply V8 reaches a stabilized voltage when the voltage of a point A and the voltage of a point C meet the condition of | VCC-| < VAC < = (VCC + | VCC-|), and the uniqueness of power supply polarity access of the point A, the point B and the point C can be determined by combining a polarity judgment module; the switch driving module is used for controlling a switch device in the load switch control module; the load switch control module is used for controlling on or off of load power supply. And an anti-reverse connection protection function is realized.

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Description

Technical Field

[0001] The present invention relates to the technical field of power supply and electromechanical control, and in particular to a positive and negative direct current dual voltage input reverse connection protection control circuit. Background Art

[0002] In the field of power supply and electromechanical control technology, input reverse connection protection is one of the important measures to ensure the safe operation of equipment and prevent circuit damage.

[0003] For many existing applications, a single power supply is sufficient to meet the needs, so using a single power supply system can reduce the cost and complexity of the system; at the same time, under a single power supply system, the circuit design is relatively simple, easy to implement and maintain; in addition, under a single power supply system, since there is only one power input, the control logic of the reverse connection protection is more direct and reliable.

[0004] Traditional anti-reverse polarity protection control circuits are mainly designed for single power supply systems, and anti-reverse polarity protection for single power supply is achieved by connecting components such as diodes in series.

[0005] However, when positive and negative power supplies are input at the same time, this protection circuit based on a single power supply system cannot effectively determine the input of the positive power supply and the reference power supply, thereby failing to achieve reverse connection protection for the positive and negative DC power supplies.

[0006] Therefore, with the diversification of power supply types and the improvement of performance requirements for electrical equipment, power supply and electromechanical control systems have put forward higher requirements for input reverse connection protection control circuits.

[0007] Currently, in the case of dual voltage input, there are still the following two technical difficulties:

[0008] On the one hand, the system needs to be able to accurately identify which is the positive power supply, which is the negative power supply, or which is the reference power supply;

[0009] On the other hand, dual voltage inputs mean that there are many possible connection combinations, and the control logic must be able to handle these combinations to ensure that correct reverse connection protection is provided in all cases. Summary of the invention

[0010] The technical problem to be solved by the present invention is how to design an anti-reverse connection protection control circuit suitable for positive and negative DC dual voltage input state.

[0011] In order to solve the above technical problems, the present invention provides a positive and negative DC dual voltage input anti-reverse connection protection control circuit, the circuit has a positive voltage VCC, a reference voltage GND and a negative voltage VCC-, and the point where the positive voltage VCC is connected in the normal input form of the circuit is point A, the point where the reference voltage GND is connected is point B, and the point where the negative voltage VCC- is connected is point C. The circuit also includes a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module, wherein:

[0012] The polarity judgment module includes a diode V1, a diode V4 and a diode V9; the polarity judgment module determines all forms of polarity access of the power supply at points A, B and C through the unidirectional conductivity of the diodes V1, V4 and V9;

[0013] The voltage judgment module includes a resistor R6, a resistor R12 and a voltage reference power supply V8; the voltage judgment module adjusts the resistance values of the resistors R6 and R12 connected in series so that when the voltages at the points A and C meet the condition of |VCC-|<VAC≤(VCC+|VCC-|), the reference voltage of the voltage reference power supply V8 reaches the regulated voltage, and the uniqueness of the power polarity access at the points A, B and C can be determined in combination with the polarity judgment module;

[0014] The switch driving module is used to control the switch device in the load switch control module;

[0015] The load switch control module is used to control the on or off of the load power supply.

[0016] Furthermore, the load switch control module includes an electric control device K1 and an electric control device K2; wherein:

[0017] The anode of the diode V1 is connected to the positive voltage VCC, and the cathode of the diode V1 is connected to the electronic control device K1, so that the point A can only be connected to the positive voltage VCC or the reference voltage GND through the diode V1;

[0018] The anode of the diode V4 is connected to the reference voltage GND, and the cathode of the diode V4 is connected to the electronic control device K2, so that the point B can only be connected to the positive voltage VCC or the reference voltage GND through the diode V4;

[0019] The anode of the diode V9 is connected to pin 3 of the voltage reference power supply V8, and the cathode of the diode V9 is connected to the negative voltage VCC-. Through the diode V9, the point C can only be connected to the reference voltage GND or the negative voltage VCC-.

[0020] Furthermore, the load switch control module also includes a switch tube Q1, a switch tube Q2, a freewheeling diode V2 and a freewheeling diode V5; wherein the freewheeling diode V2 is connected in parallel with the electronic control device K1; and the freewheeling diode V5 is connected in parallel with the electronic control device K2.

[0021] Furthermore, the switch driving module includes an optocoupler E1, an optocoupler E2 and a voltage regulator diode V7, wherein:

[0022] Pin 1 of the optocoupler E1 is connected to the cathode of the diode V1, pin 2 of the optocoupler E1 is connected to pin 1 of the optocoupler E2, pin 3 of the optocoupler E1 is connected to the base of the switch tube Q1, and pin 4 of the optocoupler E1 is connected to the cathode of the diode V1;

[0023] Pin 2 of the optical coupler E2 is connected to pin 1 of the voltage reference power supply V8, pin 3 of the optical coupler E2 is connected to the base of the switch tube Q2, and pin 4 of the optical coupler E2 is connected to the cathode of the diode V4;

[0024] The anode of the voltage stabilizing diode V7 is grounded, and the cathode of the voltage stabilizing diode V7 is connected to the positive voltage VCC through the diode V1.

[0025] Furthermore, the switch driving module further includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C3, a zener diode V3 and a zener diode V6; wherein,

[0026] The resistor R1 and the resistor R3 are connected in series between the cathode of the diode V1 and the pin 1 of the optocoupler E1;

[0027] The resistor R2 and the resistor R4 are connected in series and then connected in parallel with the voltage zener diode V3, and the cathode of the voltage zener diode V3 is connected to the pin 4 of the optical coupler E1;

[0028] The resistor R5 is connected to the base of the switch tube Q1;

[0029] The resistor R7 is connected in parallel with the capacitor C1 and then connected to the base of the switch tube Q1;

[0030] The resistor R8 is connected in series with the resistor R9 and then connected in parallel with the voltage zener diode V6, and the cathode of the voltage zener diode V6 is connected to the pin 4 of the optical coupler E2;

[0031] The resistor R10 is connected to the base of the switch tube Q2;

[0032] The resistor R11 is connected in parallel with the capacitor C3 and then connected to the base of the switch tube Q2.

[0033] Furthermore, the voltage determination module further includes a capacitor C2 and a capacitor C4; wherein:

[0034] The resistor R6 is connected in series with the resistor R12 and then connected in parallel with the capacitor C2, and connected to the cathode of the diode V1 and the anode of the diode V9. The capacitor C2 is used to filter out high-frequency interference of the power input;

[0035] The resistor R12 is connected in parallel with the capacitor C4 and connected to the pin 2 of the voltage reference power supply V8. The capacitor C4 is used to filter out interference at the reference voltage of the voltage reference power supply V8.

[0036] Furthermore, the voltage reference power supply V8 is a precision shunt regulator.

[0037] Furthermore, the switch tubes Q1 and Q2 may be triodes, MOS tubes or IGBTs, which are used to control the on and off of the electronic control devices K1 and K2.

[0038] Furthermore, the electric control device K1 and the electric control device K2 may be a relay or a contactor, which is used to control the on or off of the load power supply.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention realizes the function of anti-reverse connection protection by cutting off the load power supply when the power input is connected incorrectly under the condition of positive and negative DC dual voltage input through the polarity judgment module, the voltage judgment module, the switch driving module and the load switch control module; at the same time, it has complete current limiting, undervoltage and overvoltage protection functions and strong anti-interference ability, which can meet the application of various voltage systems and strong electromagnetic interference environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a principle block diagram of the present invention;

[0042] Figure 2 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0043] In order to make the technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0044] The present invention aims to provide a positive and negative DC dual voltage input anti-reverse connection protection control circuit, which can realize cutting off the load power supply when the power input is connected incorrectly under the condition of positive and negative DC dual voltage input, and at the same time, has current limiting, undervoltage and overvoltage protection functions, so as to meet the application of various voltage systems and strong electromagnetic interference environment.

[0045] refer to Figure 1 The circuit mainly includes a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module. The output end of the power input module is connected to the input end of the polarity judgment module, the output end of the polarity judgment module is connected to the input end of the voltage judgment module, the output end of the voltage judgment module is connected to the input end of the switch driving module, the output end of the switch driving module is connected to the input end of the load switch control module, and the output end of the load switch control module is connected to load 1 and load 2.

[0046] refer to Figure 2 The circuit has a positive voltage VCC, a reference voltage GND and a negative voltage VCC-, and the point where the positive voltage VCC is connected in the normal input form of the circuit is point A, the point where the reference voltage GND is connected is point B, and the point where the negative voltage VCC- is connected is point C.

[0047] The normal input form of positive and negative DC dual voltage is:

[0048] The positive voltage VCC is connected to point A, the reference voltage GND is connected to point B, and the negative voltage VCC- is connected to point C.

[0049] Abnormal wiring form of positive and negative DC dual voltage is:

[0050] Type 1: The positive voltage VCC is connected to point A, the negative voltage VCC-VCC- is connected to point B, and the reference voltage GND is connected to point C;

[0051] Type 2: The reference voltage GND is connected to point A, the positive voltage VCC is connected to point B, and the negative voltage VCC- is connected to point C;

[0052] Type 3: The reference voltage GND is connected to point A, the negative voltage VCC- is connected to point B, and the positive voltage VCC is connected to point C;

[0053] Type 4: Negative voltage VCC- is connected to point A, positive voltage VCC is connected to point B, and reference voltage GND is connected to point C;

[0054] Type 5: Negative voltage VCC- is connected to point A, reference voltage GND is connected to point B, and positive voltage VCC is connected to point C.

[0055] It can be seen that in the case of dual voltage input, the system needs to be able to accurately identify which is the positive power supply, which is the negative power supply, and which is the reference power supply; and be able to handle these different combinations to ensure that correct anti-reverse connection protection is provided in any case.

[0056] Combine the following Figure 2 , the polarity judgment module, the voltage judgment module, the switch driving module and the load switch control module are further described in detail.

[0057] 1. Electronic components of each module:

[0058] The polarity determination module includes a diode V1, a diode V4 and a diode V9.

[0059] The voltage determination module includes a resistor R6, a resistor R12, a capacitor C2, a capacitor C4 and a voltage reference power supply V8.

[0060] The switch driving module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C3, a Zener diode V3, a Zener diode V6, a Zener diode V7, an optocoupler E1 and an optocoupler E2.

[0061] The load switch control module includes a switch tube Q1, a switch tube Q2, an electric control device K1, an electric control device K2, a freewheeling diode V2 and a freewheeling diode V5.

[0062] Preferably, the voltage reference power supply V8 uses a precision shunt regulator. When the reference voltage of the voltage reference power supply V8 (the voltage of pin 2 to pin 3) reaches the regulated voltage, the cathode (pin 1) to the anode (pin 3) of the voltage reference power supply V8 is turned on.

[0063] Optionally, the switch tubes Q1 and Q2 may be triodes, MOS tubes or IGBTs, which are used to control the on and off of the electronic control devices K1 and K2.

[0064] Optionally, the electric control devices K1 and K2 may be relays or contactors for controlling the on or off of the load power supply.

[0065] 2. Functional description of each module:

[0066] 2.1 Polarity Judgment Module

[0067] The polarity judgment module determines all forms of power polarity access at points A, B and C by utilizing the unidirectional conductivity of diodes V1, V4 and V9.

[0068] Further explanation:

[0069] The anode of the diode V1 is connected to the positive voltage VCC, and the cathode of the diode V1 is connected to the electronic control device K1. Through the diode V1, point A can only be connected to the positive voltage VCC or the reference voltage GND.

[0070] The anode of the diode V4 is connected to the reference voltage GND, and the cathode of the diode V4 is connected to the electronic control device K2. Through the diode V4, point B can only be connected to the positive voltage VCC or the reference voltage GND.

[0071] The anode of the diode V9 is connected to the 3rd pin of the voltage reference power supply V8, and the cathode of the diode V9 is connected to the negative voltage VCC-. Through the diode V9, point C can only be connected to the reference voltage GND or the negative voltage VCC-.

[0072] 2.2 Voltage judgment module

[0073] The voltage judgment module can set the circuit startup voltage Von by adjusting the resistance values of the resistors R6 and R12, and simultaneously realize the undervoltage protection function.

[0074] The voltage judgment module adjusts the resistance values of the resistors R6 and R12 connected in series so that when the voltages at points A and C meet the condition of |VCC-|<VAC≤(VCC+|VCC-|), the reference voltage (voltage between pins 2 and 3) of the voltage reference power supply V8 reaches the regulated voltage. Combined with the polarity judgment module, it can be determined that point A can only be connected to the positive voltage VCC and point C can only be connected to the negative voltage VCC-, thereby achieving the uniqueness of the power polarity access at points A, B and C.

[0075] Further:

[0076] Resistor R6 and resistor R12 are connected in series and then connected in parallel with capacitor C2, and connected to the cathode of diode V1 and the anode of diode V9. Capacitor C2 is used to filter out high-frequency interference of power input;

[0077] Resistor R12 and capacitor C4 are connected in parallel to pin 2 of voltage reference power supply V8. Capacitor C4 is used to filter out interference at the reference voltage of the precision shunt regulator to avoid malfunction and ensure system reliability.

[0078] 2.3 Switch drive module

[0079] The switch driving module is used to control the switch device in the load switch control module.

[0080] When the input positive and negative DC dual voltage input form is positive voltage VCC connected to point A, reference voltage GND connected to point B, negative voltage VCC- connected to point C:

[0081] Pin 1 of optocoupler E1 is connected to the cathode of diode V1, pin 2 of optocoupler E1 is connected to pin 1 of optocoupler E2, pin 3 of optocoupler E1 is connected to the base of switch tube Q1, and pin 4 of optocoupler E1 is connected to the cathode of diode V1; pin 2 of optocoupler E2 is connected to pin 1 of voltage reference power supply V8, pin 3 of optocoupler E2 is connected to the base of switch tube Q2, and pin 4 of optocoupler E2 is connected to the cathode of diode V4. That is, optocoupler E1 and optocoupler E2 are turned on due to voltage reference power supply V8, so that the primary of optocoupler E1 and optocoupler E2 is turned on, and finally the switch tube Q1 and switch tube Q2 are controlled.

[0082] The positive electrode of the voltage zener diode V7 is grounded, and the negative electrode of the voltage zener diode V7 is connected to the positive voltage VCC through the diode V1. That is, the voltage zener diode V7 clamps the primary input voltage of the optocoupler E1 and the optocoupler E2 to prevent the damage of the optocoupler E1 and the optocoupler E2 due to excessive input voltage.

[0083] Resistors R1 and R3 are connected in series between the cathode of diode V1 and pin 1 of optocoupler E1. Resistors R1 and R3 control the primary input current of optocouplers E1 and E2, making them work in a saturated conduction state; at the same time, resistors R1 and R3 are connected in series to divide the voltage, so as to avoid breakdown caused by too low withstand voltage of a single resistor.

[0084] Resistors R2 and R4 are connected in series and then connected in parallel with Zener diode V3, and the cathode of Zener diode V3 is connected to pin 4 of optocoupler E1. Resistors R2 and R4 divide the voltage and clamp the Zener diode V3 to prevent the secondary input voltage of optocoupler E1 from being damaged by excessive voltage.

[0085] The resistor R5 is connected to the base of the switch tube Q1, that is, the resistor R5 drives the switch tube Q1 to limit the current.

[0086] The resistor R7 and the capacitor C1 are connected in parallel to the base of the switch tube Q1, that is, the pull-down resistor R7 and the filter capacitor C1 together ensure that the driving level of the switch tube Q1 is stable.

[0087] Resistors R8 and R9 are connected in series and then connected in parallel with Zener diode V6, and the cathode of Zener diode V6 is connected to pin 4 of optocoupler E2. That is, the voltage divider of resistors R8 and R9 cooperates with the clamp of Zener diode V6 to prevent the secondary input voltage of optocoupler E2 from being damaged by excessively high voltage.

[0088] The resistor R10 is connected to the base of the switch tube Q2, that is, the resistor R10 drives the switch tube Q2 to limit the current.

[0089] The resistor R11 and the capacitor C3 are connected in parallel to the base of the switch tube Q2, that is, the pull-down resistor R11 and the filter capacitor C3 together ensure the stability of the driving level of the switch tube Q2.

[0090] 2.4. Load switch control module

[0091] The load switch control module is used to control the on or off of the load power supply.

[0092] Furthermore, the freewheeling diode V2 is connected in parallel with the electric control device K1; the freewheeling diode V5 is connected in parallel with the electric control device K2. That is, the freewheeling diode V2 and the freewheeling diode V5 are used for freewheeling protection of the electric control device K1 and the electric control device K2 when the wire package is powered off, so as to prevent the wire package from being burned out.

[0093] Under the premise that the current protection circuit based on a single power supply system cannot effectively judge the input of the positive power supply and the reference power supply, and thus cannot realize the anti-reverse connection protection of the positive and negative DC power supplies, the present invention can cut off the load power supply when the power input is connected incorrectly under the condition of positive and negative DC dual voltage input, thereby realizing the anti-reverse connection protection function; at the same time, the minimum undervoltage protection function can be realized by adjusting the resistance value of the matching resistor, and the load power supply circuit is cut off when the input voltage is too low; in addition, the device has complete current limiting, overvoltage, anti-interference and other protections, and has strong applicability, which can meet the application of various voltage systems and strong electromagnetic interference environments.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positive and negative DC dual voltage input anti-reverse connection protection control circuit, the circuit has a positive voltage VCC, a reference voltage GND and a negative voltage VCC-, and the point where the positive voltage VCC is connected in the normal input form of the circuit is point A, the point where the reference voltage GND is connected is point B, and the point where the negative voltage VCC- is connected is point C, characterized in that: The circuit also includes a polarity judgment module, a voltage judgment module, a switch driving module and a load switch control module, wherein: The polarity judgment module includes a diode V1, a diode V4 and a diode V9; the polarity judgment module determines all forms of polarity access of the power supply at points A, B and C through the unidirectional conductivity of the diodes V1, V4 and V9; The voltage judgment module includes a resistor R6, a resistor R12 and a voltage reference power supply V8; the voltage judgment module adjusts the resistance values of the resistors R6 and R12 connected in series so that when the voltages at the points A and C meet the condition of |VCC-|<VAC≤(VCC+|VCC-|), the reference voltage of the voltage reference power supply V8 reaches the regulated voltage, and the uniqueness of the power polarity access at the points A, B and C can be determined in combination with the polarity judgment module; The switch driving module is used to control the switch device in the load switch control module; The load switch control module is used to control the on or off of the load power supply.

2. The positive and negative DC dual voltage input anti-reverse connection protection control circuit according to claim 1, characterized in that: The load switch control module includes an electric control device K1 and an electric control device K2; wherein: The anode of the diode V1 is connected to the positive voltage VCC, and the cathode of the diode V1 is connected to the electronic control device K1, so that the point A can only be connected to the positive voltage VCC or the reference voltage GND through the diode V1; The anode of the diode V4 is connected to the reference voltage GND, and the cathode of the diode V4 is connected to the electronic control device K2, so that the point B can only be connected to the positive voltage VCC or the reference voltage GND through the diode V4; The anode of the diode V9 is connected to pin 3 of the voltage reference power supply V8, and the cathode of the diode V9 is connected to the negative voltage VCC-. Through the diode V9, the point C can only be connected to the reference voltage GND or the negative voltage VCC-.

3. The positive and negative DC dual voltage input anti-reverse connection protection control circuit according to claim 2, characterized in that: The load switch control module further includes a switch tube Q1, a switch tube Q2, a freewheeling diode V2 and a freewheeling diode V5; wherein the freewheeling diode V2 is connected in parallel with the electronic control device K1; and the freewheeling diode V5 is connected in parallel with the electronic control device K2.

4. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 3, characterized in that: The switch driving module includes an optocoupler E1, an optocoupler E2 and a voltage regulator diode V7, wherein: Pin 1 of the optocoupler E1 is connected to the cathode of the diode V1, pin 2 of the optocoupler E1 is connected to pin 1 of the optocoupler E2, pin 3 of the optocoupler E1 is connected to the base of the switch tube Q1, and pin 4 of the optocoupler E1 is connected to the cathode of the diode V1; Pin 2 of the optical coupler E2 is connected to pin 1 of the voltage reference power supply V8, pin 3 of the optical coupler E2 is connected to the base of the switch tube Q2, and pin 4 of the optical coupler E2 is connected to the cathode of the diode V4; The anode of the voltage stabilizing diode V7 is grounded, and the cathode of the voltage stabilizing diode V7 is connected to the positive voltage VCC through the diode V1.

5. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 4, characterized in that: The switch driving module further includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C3, a voltage regulator diode V3 and a voltage regulator diode V6; wherein, The resistor R1 and the resistor R3 are connected in series between the cathode of the diode V1 and the pin 1 of the optocoupler E1; The resistor R2 and the resistor R4 are connected in series and then connected in parallel with the voltage zener diode V3, and the cathode of the voltage zener diode V3 is connected to the pin 4 of the optical coupler E1; The resistor R5 is connected to the base of the switch tube Q1; The resistor R7 is connected in parallel with the capacitor C1 and then connected to the base of the switch tube Q1; The resistor R8 and the resistor R9 are connected in series and then connected in parallel with the voltage zener diode V6, and the cathode of the voltage zener diode V6 is connected to the 4th pin of the optical coupler E2; The resistor R10 is connected to the base of the switch tube Q2; The resistor R11 is connected in parallel with the capacitor C3 and then connected to the base of the switch tube Q2.

6. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 1, characterized in that: The voltage determination module further includes a capacitor C2 and a capacitor C4; wherein: The resistor R6 is connected in series with the resistor R12 and then connected in parallel with the capacitor C2, and connected to the cathode of the diode V1 and the anode of the diode V9. The capacitor C2 is used to filter out high-frequency interference of the power input; The resistor R12 is connected in parallel with the capacitor C4 and connected to the pin 2 of the voltage reference power supply V8. The capacitor C4 is used to filter out interference at the reference voltage of the voltage reference power supply V8.

7. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 1, characterized in that: The voltage reference power supply V8 is a precision shunt regulator.

8. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 3, characterized in that: The switch tubes Q1 and Q2 may be triodes, MOS tubes or IGBTs, and are used to control the on and off of the electronic control devices K1 and K2.

9. The positive and negative DC dual voltage input reverse connection protection control circuit according to claim 2, characterized in that: The electric control devices K1 and K2 may be relays or contactors, which are used to control the on or off of the load power supply.