A signal and charging switching control circuit applied to a relay

Abstract

The application provides a signal and charging switching control circuit applied to a relay, comprising an operational amplifier control module, a first relay control module, a second relay control module, a third relay control module and a voltage conversion module, the operational amplifier control module is used for outputting a first control signal and a second control signal according to a CPR signal and a CPS signal; the first relay control module, the second relay control module and the third relay control module are used for controlling a signal relay K2-S to switch signals in front and back and controlling a power relay K4-R and a power relay K3-S to switch charging according to the first control signal and the second control signal, and the voltage conversion module is used for converting voltage to supply power, and the beneficial effect is that the application can uniformly control signal switching of a signal relay and charging switching of a power relay, and improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay control circuit, in particular to a signal and charging switching control circuit applied to a relay. BACKGROUND

[0002] With the rapid development of electronic technology and computer technology, electronic devices and their related control devices are increasing, and in order to better meet the needs, these electronic devices and related control devices are constantly pursuing miniaturization, integration and intelligence.

[0003] A relay is an electrical device that turns on or off a circuit according to changes in physical quantities such as voltage, current, temperature, speed or time, and its main function is protection and control.

[0004] Relay systems are usually used in product testing as control devices. With the continuous development of industry, the number of product ports is increasing, and there is a higher requirement for the testing efficiency of products. Relays may involve signal relays and power relays, and the current control circuit lacks a unified control strategy for signal switching of signal relays and charging switching of power relays, which reduces work efficiency in actual work scenarios. SUMMARY

[0005] The technical problem to be solved by the present application is to uniformly control the signal switching of signal relays and the charging switching of power relays, and to improve work efficiency. In order to overcome the defects of the above prior art (or related technology), the present application provides a signal and charging switching control circuit applied to a relay.

[0006] The present application provides a signal and charging switching control circuit applied to a relay, comprising:

[0007] An operational amplifier control module, a first input end of the operational amplifier control module is connected to the fifth pin and the sixth pin of a signal relay K2-S to receive a CPR signal and a CPS signal and output corresponding first and second control signals according to the CPR signal and the CPS signal;

[0008] A first relay control module, an input end of the first relay control module is connected to an output end of the operational amplifier control module, and an output end of the first relay control module is connected to an eighth pin of the signal relay K2-S;

[0009] A second relay control module, an input end of the second relay control module is connected to an output end of the operational amplifier control module, and an output end of the second relay control module is connected to a sixth pin of a power relay K4-R;

[0010] A third relay control module, an input end of the third relay control module is connected to an output end of the operational amplifier control module, and an output end of the third relay control module is connected to a sixth pin of a power relay K3-S;

[0011] A voltage conversion module, an input end of the voltage conversion module is connected to an external power supply, a first output end of the voltage conversion module is connected to a seventh pin of the signal relay K2-S, a fifth pin of the power relay K4-R, and a fifth pin of the power relay K3-S respectively, and a second output end of the voltage conversion module is connected to a second input end of the operational amplifier control module;

[0012] The first relay control module, the second relay control module, and the third relay control module are used for controlling the signal relay K2-S to switch front and rear signals and controlling the power relay K4-R and the power relay K3-S to switch charging according to the first control signal and the second control signal.

[0013] Compared with the prior art, the application has the following advantages:

[0014] In the application, the operational amplifier control module is responsible for receiving the CPS signal and the CPR signal and generating the first control signal and the second control signal, based on the first control signal and the second control signal, the first relay control module is used for switching front and rear signals of the signal relay K2-S, the second relay control module is used for switching charging and power-off states of the power relay K4-R, and the third relay control module is used for switching charging and power-off states of the power relay K3-S, so that unified switching control is realized and work efficiency is improved.

[0015] In a possible implementation, the operational amplifier control module comprises:

[0016] A varactor D9, a negative electrode of the varactor D9 is connected to a fifth pin of the signal relay K2-S, and a positive electrode of the varactor D9 is grounded;

[0017] A resistor R10, one end of the resistor R10 is connected to the negative electrode of the varactor D9, and the other end of the resistor R10 is connected to a third pin of an operational amplifier control chip U1;

[0018] A resistor R9, one end of the resistor R9 is connected to the other end of the resistor R10, and the other end of the resistor R9 is connected to the positive electrode of the varactor D9;

[0019] A capacitor C7, one end of the capacitor C7 is connected to one end of the resistor R9, and the other end of the capacitor C7 is connected to the other end of the resistor R9;

[0020] a resistor R6, one end of the resistor R6 is connected to the other end of the capacitor C7, the other end of the resistor R6 is connected to the fifth pin of the operational amplifier control chip U1, the fourth pin of the operational amplifier control chip U1 is connected to the second output end of the voltage conversion module;

[0021] a capacitor C4, one end of the capacitor C4 is connected to one end of the resistor R6 and grounded, the other end of the capacitor C4 is connected to the other end of the resistor R6;

[0022] a resistor R11, one end of the resistor R11 is connected to the other end of the capacitor C4;

[0023] a capacitor C1, one end of the capacitor C1 is connected to one end of the capacitor C4, the other end of the capacitor C1 is connected to the other end of the resistor R11;

[0024] a resistor R2, one end of the resistor R2 is connected to the other end of the capacitor C1;

[0025] a diode D3, the negative electrode of the diode D3 is connected to the other end of the resistor R2, the positive electrode of the diode D3 is connected to the first pin and the second pin of the operational amplifier control chip U1 respectively;

[0026] a varactor diode D10, the negative electrode of the varactor diode D10 is connected to the sixth pin of the signal relay K2-S, the other end of the varactor diode D10 is connected to the positive electrode of the varactor diode D9;

[0027] a resistor R17, one end of the resistor R17 is connected to the negative electrode of the varactor diode D10, the other end of the resistor R17 is connected to the tenth pin of the operational amplifier control chip U1;

[0028] a resistor R15, one end of the resistor R15 is connected to the other end of the resistor R17, the other end of the resistor R15 is connected to the other end of the resistor R9;

[0029] a capacitor C11, one end of the capacitor C11 is connected to one end of the resistor R15, the other end of the capacitor C11 is connected to the other end of the capacitor C7;

[0030] a resistor R8, one end of the resistor R8 is connected to the other end of the capacitor C11, the other end of the resistor R8 is connected to the input end of the first relay control module;

[0031] a resistor R7, one end of the resistor R7 is connected to the other end of the resistor R8, the other end of the resistor R7 is connected to the sixth pin and the seventh pin of the operational amplifier control chip U1 respectively;

[0032] a capacitor C3, one end of the capacitor C3 is connected to the other end of the resistor R7, the other end of the capacitor C3 is connected to one end of the resistor R8;

[0033] a capacitor C6, one end of the capacitor C6 is connected to one end of the capacitor C3, the other end of the capacitor C6 is connected to one end of the resistor R6;

[0034] a diode D4, the positive electrode of the diode D4 is connected to the eighth pin and the ninth pin of the operational amplifier control chip U1 respectively;

[0035] a resistor R16, one end of the resistor R16 is connected to the negative electrode of the diode D4;

[0036] a resistor R18, one end of the resistor R18 is connected to the other end of the resistor R16, the other end of the resistor R18 is connected to the twelfth pin of the operational amplifier control chip U1;

[0037] a capacitor C5, one end of the capacitor C5 is connected to the other end of the resistor R16;

[0038] a capacitor C9, one end of the capacitor C9 is connected to the other end of the resistor R18, the other end of the capacitor C9 is connected to the other end of the capacitor C5;

[0039] a resistor R12, one end of the resistor R12 is connected to the other end of the resistor R18, the other end of the resistor R12 is connected to the other end of the capacitor C9;

[0040] a capacitor C10, one end of the capacitor C10 is connected to the other end of the resistor R12, the other end of the capacitor C10 is connected to the thirteenth pin and the fourteenth pin of the operational amplifier control chip U1 respectively;

[0041] a capacitor C8, one end of the capacitor C8 is connected to one end of the capacitor C10, the other end of the capacitor C8 is connected to the other end of the capacitor C10;

[0042] a resistor R1, one end of the resistor R1 is connected to the other end of the capacitor C8, the other end of the resistor R1 is connected to the input end of the first relay control module;

[0043] a resistor R3, one end of the resistor R3 is connected to one end of the capacitor C8, the other end of the resistor R3 is connected to the other end of the resistor R1;

[0044] The negative electrode of the varactor diode D9 and the negative electrode of the varactor diode D10 are used as the first input end of the operational amplifier control module, the fourth pin of the operational amplifier control chip U1 is used as the second input end of the operational amplifier control module, and the other end of the resistor R17 and the other end of the resistor R1 are used as the output end of the operational amplifier control module.

[0045] In a possible implementation, the first relay control module comprises:

[0046] A diode D15, the positive electrode of the diode D15 is connected to the output end of the operational amplifier control module;

[0047] A resistor R6A, one end of the resistor R6A is connected to the negative electrode of the diode D15, and the other end of the resistor R6A is connected to the drain of the field effect transistor Q2;

[0048] A diode D11, the positive electrode of the diode D11 is connected to the output end of the operational amplifier control module;

[0049] A resistor R2A, one end of the resistor R2A is connected to the negative electrode of the diode D11, and the other end of the resistor R2A is connected to the gate of the field effect transistor Q2;

[0050] A resistor R10A, one end of the resistor R10A is connected to the gate of the field effect transistor Q2, and the other end of the resistor R10A is connected to the source of the field effect transistor Q2 and grounded;

[0051] A resistor R14, one end of the resistor R14 is connected to the drain of the field effect transistor Q2, and the other end of the resistor R14 is connected to the source of the field effect transistor Q2;

[0052] A field effect transistor Q6, the gate of the field effect transistor Q6 is connected to one end of the resistor R14, the drain of the field effect transistor Q6 is connected to the eighth pin of the signal relay K2-S, and the source of the field effect transistor Q6 is connected to the other end of the resistor R14;

[0053] The positive electrode of the diode D15 and the positive electrode of the diode D11 are used as the input end of the first relay control module, and the drain of the field effect transistor Q6 is used as the output end of the first relay control module.

[0054] In a possible implementation, the second relay control module comprises:

[0055] A diode D17, the positive electrode of the diode D17 is connected to the output end of the operational amplifier control module;

[0056] A resistor R8A, one end of the resistor R8A is connected to the negative electrode of the diode D17, and the other end of the resistor R8A is connected to the drain of the field effect transistor Q4;

[0057] a diode D13, a positive electrode of which is connected to an output end of the operational amplifier control module;

[0058] a resistor R4, one end of which is connected to a negative electrode of the diode D13, and the other end of which is connected to a gate of a field effect transistor Q4;

[0059] a resistor R12A, one end of which is connected to the gate of the field effect transistor Q4, and the other end of which is connected to a source of the field effect transistor Q4 and grounded;

[0060] a resistor R16A, one end of which is connected to a drain of the field effect transistor Q4, and the other end of which is connected to the source of the field effect transistor Q4;

[0061] a field effect transistor Q8, a gate of which is connected to one end of the resistor R16A, a drain of which is connected to a sixth pin of the signal relay K4-R, and a source of which is connected to the other end of the resistor R16A;

[0062] a positive electrode of the diode D17 and a positive electrode of the diode D13 are connected as an input end of the second relay control module, and a drain of the field effect transistor Q8 is connected as an output end of the second relay control module.

[0063] In a possible implementation, the third relay control module comprises:

[0064] a diode D16, a positive electrode of which is connected to the output end of the operational amplifier control module;

[0065] a resistor R7A, one end of which is connected to a negative electrode of the diode D16, and the other end of which is connected to a drain of a field effect transistor Q3;

[0066] a diode D12, a positive electrode of which is connected to the output end of the operational amplifier control module;

[0067] a resistor R5, one end of which is connected to a negative electrode of the diode D12, and the other end of which is connected to a gate of the field effect transistor Q3;

[0068] a resistor R11A, one end of which is connected to the gate of the field effect transistor Q3, and the other end of which is connected to a source of the field effect transistor Q3 and grounded;

[0069] a resistor R15A, one end of which is connected to a drain of the field effect transistor Q3, and the other end of which is connected to the source of the field effect transistor Q3;

[0070] a field effect tube Q7, a gate of the field effect tube Q7 is connected with one end of the resistor R15A, a drain is connected with the sixth pin of the signal relay K3-S, and a source is connected with the other end of the resistor R15A;

[0071] the positive pole of the diode D16 and the positive pole of the diode D12 are used as the input end of the third relay control module, and the drain of the field effect tube Q7 is used as the output end of the third relay control module.

[0072] In a possible implementation, the voltage conversion module comprises:

[0073] a thermal relay FR1, one end of the thermal relay FR1 is connected with the external power supply;

[0074] a diode D6, a positive pole of the diode D6 is connected with the other end of the thermal relay FR1, and a negative pole of the diode D6 is connected with the third pin of the voltage conversion chip U3, the seventh pin of the signal relay K2-S, the fifth pin of the power relay K4-R and the fifth pin of the power relay K3-S respectively;

[0075] a bidirectional TVS tube D5, one end of the bidirectional TVS tube D5 is connected with the negative pole of the diode D6, and the other end of the bidirectional TVS tube D5 is grounded;

[0076] a capacitor C12, one end of the capacitor C12 is connected with the negative pole of the diode D6, and the other end of the capacitor C12 is connected with the other end of the bidirectional TVS tube D5;

[0077] a capacitor C2, one end of the capacitor C2 is connected with the third pin of the voltage conversion chip U3, and the other end of the capacitor C2 is connected with the first pin of the voltage conversion chip U3;

[0078] a capacitor C13, one end of the capacitor C13 is connected with the second pin of the voltage conversion chip U3, and the other end of the capacitor C13 is connected with the first pin of the voltage conversion chip U3;

[0079] a capacitor C14, one end of the capacitor C14 is connected with one end of the capacitor C13 and the second input end of the operational amplifier control module respectively, and the other end of the capacitor C14 is connected with the other end of the capacitor C13;

[0080] one end of the thermal relay FR1 is used as the input end of the voltage conversion module, the negative pole of the diode D6 is used as the first output end of the voltage conversion module, and one end of the capacitor C14 is used as the second output end of the voltage conversion module.

[0081] In a possible implementation, a connector J1 is further included, a first pin of the connector J1 is connected to a second pin of the signal relay K2-S, a second pin of the connector J1 is connected to a fifth pin of the signal relay K2-S and a first input terminal of the op-amp control module respectively, a third pin of the connector J1 is connected to a fourth pin of the signal relay K2-S, a fourth pin of the connector J1 is connected to a first pin of the signal relay K2-S, a fifth pin of the connector J1 is connected to a sixth pin of the signal relay K2-S and the first input terminal of the op-amp control module respectively, a sixth pin of the connector J1 is connected to one end of the thermal relay FR1, and a seventh pin of the connector J1 is grounded.

[0082] In a possible implementation, a bidirectional TVS tube D4A is connected between a fifth pin and a sixth pin of the power relay K4-R, one end of the bidirectional TVS tube D4A is connected to the fifth pin of the power relay K4-R, and the other end of the bidirectional TVS tube D4A is connected to the sixth pin of the power relay K4-R.

[0083] In a possible implementation, a bidirectional TVS tube D3A is connected between a fifth pin and a sixth pin of the power relay K3-S, one end of the bidirectional TVS tube D3A is connected to the fifth pin of the power relay K3-S, and the other end of the bidirectional TVS tube D3A is connected to the sixth pin of the power relay K3-S.

[0084] In a possible implementation, a bidirectional TVS tube D2 is connected between a seventh pin and an eighth pin of the signal relay K2-S, one end of the bidirectional TVS tube D2 is connected to the seventh pin of the signal relay K2-S, and the other end of the bidirectional TVS tube D2 is connected to the eighth pin of the signal relay K2-S. BRIEF DESCRIPTION OF DRAWINGS

[0085] Figure 1 A schematic diagram of a module of the present application;

[0086] Figure 2 An electrical schematic diagram of an op-amp control module of the present application;

[0087] Figure 3 An electrical schematic diagram of a first relay control module of the present application;

[0088] Figure 4 An electrical schematic diagram of a second relay control module of the present application;

[0089] Figure 5 An electrical schematic diagram of a third relay control module of the present application;

[0090] Figure 6 Electrical schematic diagram of the voltage conversion module of the present application;

[0091] Figure 7 Pin schematic diagram of the connector of the present application;

[0092] Reference sign explanation: 1, operational amplifier control module; 2, first relay control module; 3, second relay control module; 4, third relay control module; 5, voltage conversion module. DETAILED DESCRIPTION

[0093] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0094] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0095] Reference Figures 1-6 , the embodiments of the present application disclose a signal and charging switching control circuit applied to a relay, comprising an operational amplifier control module 1, a first relay control module 2, a second relay control module 3, a third relay control module 4 and a voltage conversion module 5, wherein the operational amplifier control module is used to receive CPS signals and CPR signals and generate first control signals and second control signals, based on the first control signals and the second control signals, the first relay control module 2 is used to switch the front and rear signals of the signal relay K2-S, the second relay control module 3 is used to switch the charging or power-off state of the power relay K4-R, the third relay control module 4 is used to switch the charging or power-off state of the power relay K3-S, and the voltage conversion module 5 is used to convert the voltage of the external power supply into 12V voltage to supply power to the signal relay K2-S, the power relay K4-R and the power relay K3-S, and convert 5V voltage to supply power to the operational amplifier control chip U1.

[0096] Continue to refer to Figures 1-6, the operational amplifier control module 1 includes operational amplifier control chip U1, diode D3, diode D4, varactor diode D9, varactor diode D10, resistor R1, resistor R2, resistor R3, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10 and capacitor C11; the first relay control module 2 includes diode D11, diode D15, resistor R2A, resistor R6A, resistor R10A, resistor R14, field effect transistor Q2 and field effect transistor Q6; the second relay control module 3 includes diode D13, diode D17, resistor R4, resistor R8, resistor R12A, resistor R16A, field effect transistor Q4 and field effect transistor Q8; the third relay control module 4 includes diode D12, diode D16, resistor R5, resistor R7, resistor R11A, resistor R15A, field effect transistor Q3 and field effect transistor Q7; the voltage conversion module 5 includes voltage conversion chip U3, thermal relay FR1, bidirectional TVS tube D5, diode D6, capacitor C2, capacitor C12, capacitor C13 and capacitor C14; the input CPS and CPR signals are amplified by the four groups of operational amplifiers of the operational amplifier control module 1, the corresponding first control signal OUTA and second control signal OUTB are output by the logic circuit to control the switching of field effect transistor Q2, field effect transistor Q3, field effect transistor Q4, field effect transistor Q6, field effect transistor Q7, field effect transistor Q8, the control signal relay K2-S, power relay K3-S, power relay K4-R front and rear signals and the switching of charging, and the model of the operational amplifier control chip U1 is TSSOP14.

[0097] Continuing to refer to Figures 2-5 When the input signal CPS is high, the second control signal OUTB becomes high, field effect transistor Q4, field effect transistor Q6 and field effect transistor Q7 are turned on, and at the same time field effect transistor Q2, field effect transistor Q3 and field effect transistor Q8 are turned off, ensuring that the first control signal OUTA is low; when the input signal CPR is high, the first control signal OUTA becomes high, field effect transistor Q2, field effect transistor Q3 and field effect transistor Q8 are turned on, and at the same time field effect transistor Q4, field effect transistor Q6 and field effect transistor Q7 are turned off, ensuring that the second control signal OUTB is low, so that when the state of any one input signal changes, the state of the output control signal can be changed synchronously, realizing the interlocking of field effect transistors.

[0098] Continuing to refer to Figure 6 The ultra-low power consumption LDO power supply is converted to 5V by the voltage conversion module 5 to supply power to the four-way operational amplifier, and the static working current of the whole machine is adjusted to <100uA by the peripheral circuit.

[0099] With reference to the foregoing Figure 2 , the DC bias and common-mode noise in the differential signal are filtered by the differential capacitance of C7 and C11 in combination with the resistance of R10, R17 and R9, R15, effectively reducing the amplitude of the input signal and the anti-interference ability of the operational amplifier control.

[0100] With reference to the foregoing Figure 7 , the first pin of connector J1 is connected to the second pin of signal relay K2-S, the second pin of connector J1 is connected to the fifth pin of signal relay K2-S and the first input terminal of operational amplifier control module 1 respectively, the third pin of connector J1 is connected to the fourth pin of signal relay K2-S, the fourth pin of connector J1 is connected to the first pin of signal relay K2-S, the fifth pin of connector J1 is connected to the sixth pin of signal relay K2-S and the first input terminal of operational amplifier control module 1 respectively, one end of the sixth pin of connector J1 is connected to one end of thermal relay FR1, and the seventh pin of connector J1 is grounded.

[0101] With reference to the foregoing Figure 4 , a bidirectional TVS tube D4A is connected between the fifth and sixth pins of power relay K4-R, one end of the bidirectional TVS tube D4A is connected to the fifth pin of power relay K4-R, and the other end of the bidirectional TVS tube D4A is connected to the sixth pin of power relay K4-R.

[0102] With reference to the foregoing Figure 5 , a bidirectional TVS tube D3A is connected between the fifth and sixth pins of power relay K3-S, one end of the bidirectional TVS tube D3A is connected to the fifth pin of power relay K3-S, and the other end of the bidirectional TVS tube D3A is connected to the sixth pin of power relay K3-S.

[0103] With reference to the foregoing Figure 3 , a bidirectional TVS tube D2 is connected between the seventh and eighth pins of signal relay K2-S, one end of the bidirectional TVS tube D2 is connected to the seventh pin of signal relay K2-S, and the other end of the bidirectional TVS tube D2 is connected to the eighth pin of signal relay K2-S.

[0104] With reference to the foregoing Figure 4 and Figure 5 , the third pin of power relay K4-R is connected to the LR interface, the first pin is connected to the NR interface, the fourth pin is connected to the L interface, and the second pin is connected to the N interface, the third pin of power relay K3-R is connected to the L interface, the first pin is connected to the N interface, the fourth pin is connected to the LS interface, and the second pin is connected to the NS interface, wherein L interface represents firewire, and N interface represents zero line.

[0105] In the description of the application, the description of the terms "one embodiment", "some embodiments", "in this embodiment", "specific example", or "some examples" and the like means that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0106] The above description is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A signal and charging switching control circuit applied to a relay, characterized by, The utility model relates to a kind of signal switching circuit, including: Operational amplifier control module (1), the first input of the operational amplifier control module (1) is connected with the fifth pin and the sixth pin of signal relay K2-S respectively to receive CPR signal and CPS signal and output corresponding first control signal and second control signal according to the CPR signal and the CPS signal; First relay control module (2), the input of the first relay control module (2) is connected with the output of the operational amplifier control module (1), and the output of the first relay control module (2) is connected with the eighth pin of the signal relay K2-S; Second relay control module (3), the input of the second relay control module (3) is connected with the output of the operational amplifier control module (1), and the output of the second relay control module (3) is connected with the sixth pin of power relay K4-R; Third relay control module (4), the input of the third relay control module (4) is connected with the output of the operational amplifier control module (1), and the output of the third relay control module (4) is connected with the sixth pin of power relay K3-S; Voltage conversion module (5), the input of the voltage conversion module (5) is connected with external power supply, and the first output of the voltage conversion module (5) is connected with the seventh pin of the signal relay K2-S, the fifth pin of the power relay K4-R and the fifth pin of the power relay K3-S respectively, and the second output of the voltage conversion module (5) is connected with the second input of the operational amplifier control module (1); The first relay control module (2), the second relay control module (3) and the third relay control module (4) are used for controlling the signal relay K2-S to switch forward and backward signals according to the first control signal and the second control signal, and controlling the power relay K4-R and the power relay K3-S to switch charging; The operational amplifier control module (1) includes: Varactor D9, the negative electrode of the varactor D9 is connected with the fifth pin of the signal relay K2-S, and the positive electrode of the varactor D9 is grounded; Resistance R10, one end of the resistance R10 is connected with the negative electrode of the varactor D9, and the other end of the resistance R10 is connected with the third pin of operational amplifier control chip U1; Resistance R9, one end of the resistance R9 is connected with the other end of the resistance R10, and the other end of the resistance R9 is connected with the positive electrode of the varactor D9; Capacitor C7, one end of the capacitor C7 is connected with one end of the resistance R9, and the other end of the capacitor C7 is connected with the other end of the resistance R9; Resistance R6, one end of the resistance R6 is connected with the other end of the capacitor C7, and the other end of the resistance R6 is connected with the fifth pin of the operational amplifier control chip U1, and the fourth pin of the operational amplifier control chip U1 is connected with the second output of the voltage conversion module (5). a varactor diode D10, a negative electrode of the varactor diode D10 is connected to a sixth pin of the signal relay K2-S, and the other end of the varactor diode D10 is connected to a positive electrode of the varactor diode D9; a resistor R17, one end of the resistor R17 is connected to a negative electrode of the varactor diode D10, and the other end of the resistor R17 is connected to a tenth pin of the operational amplifier control chip U1; a resistor R15, one end of the resistor R15 is connected to the other end of the resistor R17, and the other end of the resistor R15 is connected to the other end of the resistor R9; a capacitor C11, one end of the capacitor C11 is connected to one end of the resistor R15, and the other end of the capacitor C11 is connected to the other end of the capacitor C7; a resistor R8, one end of the resistor R8 is connected to the other end of the capacitor C11, and the other end of the resistor R8 is connected to an input end of the first relay control module (2); a resistor R7, one end of the resistor R7 is connected to the other end of the resistor R8, and the other end of the resistor R7 is connected to a sixth pin and a seventh pin of the operational amplifier control chip U1 respectively; a diode D4, a positive electrode of the diode D4 is connected to an eighth pin and a ninth pin of the operational amplifier control chip U1 respectively; a resistor R16, one end of the resistor R16 is connected to a negative electrode of the diode D4; a resistor R18, one end of the resistor R18 is connected to the other end of the resistor R16, and the other end of the resistor R18 is connected to a twelfth pin of the operational amplifier control chip U1; a capacitor C5, one end of the capacitor C5 is connected to the other end of the resistor R16; a capacitor C9, one end of the capacitor C9 is connected to the other end of the resistor R18, and the other end of the capacitor C9 is connected to the other end of the capacitor C5; a resistor R12, one end of the resistor R12 is connected to the other end of the resistor R18, and the other end of the resistor R12 is connected to the other end of the capacitor C9; a capacitor C10, one end of the capacitor C10 is connected to the other end of the resistor R12, and the other end of the capacitor C10 is connected to a thirteenth pin and a fourteenth pin of the operational amplifier control chip U1 respectively; a capacitor C8, one end of the capacitor C8 is connected to one end of the capacitor C10, and the other end of the capacitor C8 is connected to the other end of the capacitor C10; a resistor R1, one end of the resistor R1 is connected to the other end of the capacitor C8, and the other end of the resistor R1 is connected to an input end of the first relay control module (2); a negative electrode of the varactor diode D9 and a negative electrode of the varactor diode D10 are used as a first input end of the operational amplifier control module (1), a fourth pin of the operational amplifier control chip U1 is used as a second input end of the operational amplifier control module (1), and the other end of the resistor R17 and the other end of the resistor R1 are used as an output of the operational amplifier control module (1).

2. The signal and charge switching control circuit of claim 1, wherein, The operational amplifier control module (1) further comprises: a capacitor C4, one end of the capacitor C4 is connected to one end of the resistor R6 and grounded, and the other end of the capacitor C4 is connected to the other end of the resistor R6. A resistor R11, one end of which is connected to the other end of the capacitor C4; A capacitor C1, one end of which is connected to one end of the capacitor C4, and the other end of which is connected to the other end of the resistor R11; A resistor R2, one end of which is connected to the other end of the capacitor C1; A diode D3, the negative electrode of which is connected to the other end of the resistor R2, and the positive electrode of which is connected to the first pin and the second pin of the operational amplifier control chip U1 respectively; A capacitor C3, one end of which is connected to the other end of the resistor R7, and the other end of which is connected to one end of the resistor R8; A capacitor C6, one end of which is connected to one end of the capacitor C3, and the other end of which is connected to one end of the resistor R6; A resistor R3, one end of which is connected to one end of the capacitor C8, and the other end of which is connected to the other end of the resistor R1.

3. The signal and charge switching control circuit of claim 1, wherein, The first relay control module (2) comprises: A diode D15, the positive electrode of which is connected to the output end of the operational amplifier control module (1); A resistor R6A, one end of which is connected to the negative electrode of the diode D15, and the other end of which is connected to the drain electrode of the field effect transistor Q2; A diode D11, the positive electrode of which is connected to the output end of the operational amplifier control module (1); A resistor R2A, one end of which is connected to the negative electrode of the diode D11, and the other end of which is connected to the gate electrode of the field effect transistor Q2; A resistor R10A, one end of which is connected to the gate electrode of the field effect transistor Q2, and the other end of which is connected to the source electrode of the field effect transistor Q2 and grounded; A resistor R14, one end of which is connected to the drain electrode of the field effect transistor Q2, and the other end of which is connected to the source electrode of the field effect transistor Q2; A field effect transistor Q6, the gate electrode of which is connected to one end of the resistor R14, the drain electrode of which is connected to the eighth pin of the signal relay K2-S, and the source electrode of which is connected to the other end of the resistor R14; The positive electrode of the diode D15 and the positive electrode of the diode D11 serve as the input end of the first relay control module (2), and the drain electrode of the field effect transistor Q6 serves as the output end of the first relay control module (2).

4. The signal and charge switching control circuit of claim 1, wherein, The second relay control module (3) comprises: A diode D17, the positive electrode of which is connected to the output end of the operational amplifier control module (1); A resistor R8A, one end of which is connected to the negative electrode of the diode D17, and the other end of which is connected to the drain electrode of the field effect transistor Q4; A diode D13, the positive electrode of which is connected to the output end of the operational amplifier control module (1); A resistor R4, one end of which is connected to the negative electrode of the diode D13, and the other end of which is connected to the gate electrode of the field effect transistor Q4; resistor R12A, one end of which is connected to the gate of the field effect transistor Q4, the other end of which is connected to the source of the field effect transistor Q4 and grounded; resistor R16A, one end of which is connected to the drain of the field effect transistor Q4, the other end of which is connected to the source of the field effect transistor Q4; field effect transistor Q8, the gate of which is connected to one end of the resistor R16A, the drain of which is connected to the sixth pin of the signal relay K4-R, and the source of which is connected to the other end of the resistor R16A; the positive pole of the diode D17 and the positive pole of the diode D13 are the input end of the second relay control module (3), and the drain of the field effect transistor Q8 is the output end of the second relay control module (3).

5. The signal and charge switching control circuit of claim 1, wherein, The third relay control module (4) comprises: diode D16, the positive pole of which is connected to the output end of the operational amplifier control module (1); resistor R7A, one end of which is connected to the negative pole of the diode D16, the other end of which is connected to the drain of the field effect transistor Q3; diode D12, the positive pole of which is connected to the output end of the operational amplifier control module (1); resistor R5, one end of which is connected to the negative pole of the diode D12, the other end of which is connected to the gate of the field effect transistor Q3; resistor R11A, one end of which is connected to the gate of the field effect transistor Q3, the other end of which is connected to the source of the field effect transistor Q3 and grounded; resistor R15A, one end of which is connected to the drain of the field effect transistor Q3, the other end of which is connected to the source of the field effect transistor Q3; field effect transistor Q7, the gate of which is connected to one end of the resistor R15A, the drain of which is connected to the sixth pin of the signal relay K3-S, and the source of which is connected to the other end of the resistor R15A; the positive pole of the diode D16 and the positive pole of the diode D12 are the input end of the third relay control module (4), and the drain of the field effect transistor Q7 is the output end of the third relay control module (4).

6. The signal and charge switching control circuit of claim 1, wherein, The voltage conversion module (5) comprises: thermal relay FR1, one end of which is connected to the external power supply; diode D6, the positive pole of which is connected to the other end of the thermal relay FR1, the negative pole of which is connected to the third pin of the voltage conversion chip U3, the seventh pin of the signal relay K2-S, the fifth pin of the power relay K4-R and the fifth pin of the power relay K3-S respectively; bidirectional TVS tube D5, one end of which is connected to the negative pole of the diode D6, the other end of which is grounded; capacitor C12, one end of which is connected to the negative pole of the diode D6, the other end of which is connected to the other end of the bidirectional TVS tube D5; A capacitor C2, one end of which is connected to the third pin of the voltage conversion chip U3, and the other end of which is connected to the first pin of the voltage conversion chip U3; A capacitor C13, one end of which is connected to the second pin of the voltage conversion chip U3, and the other end of which is connected to the first pin of the voltage conversion chip U3; A capacitor C14, one end of which is connected to one end of the capacitor C13 and the second input end of the operational amplifier control module (1) respectively, and the other end of which is connected to the other end of the capacitor C13; One end of the thermal relay FR1 is used as the input end of the voltage conversion module (5), the negative electrode of the diode D6 is used as the first output end of the voltage conversion module (5), and one end of the capacitor C14 is used as the second output end of the voltage conversion module (5).

7. The signal and charge switching control circuit of claim 6, wherein, The first pin of the connector J1 is connected to the second pin of the signal relay K2-S, the second pin of the connector J1 is connected to the fifth pin of the signal relay K2-S and the first input end of the operational amplifier control module (1) respectively, the third pin of the connector J1 is connected to the fourth pin of the signal relay K2-S, the fourth pin of the connector J1 is connected to the first pin of the signal relay K2-S, the fifth pin of the connector J1 is connected to the sixth pin of the signal relay K2-S and the first input end of the operational amplifier control module (1) respectively, the sixth pin of the connector J1 is connected to one end of the thermal relay FR1, and the seventh pin of the connector J1 is grounded.

8. The signal and charge switching control circuit of claim 1, wherein, A bidirectional TVS tube D4A is connected between the fifth pin and the sixth pin of the power relay K4-R, one end of the bidirectional TVS tube D4A is connected to the fifth pin of the power relay K4-R, and the other end of the bidirectional TVS tube D4A is connected to the sixth pin of the power relay K4-R.

9. The signal and charge switching control circuit of claim 1, wherein, A bidirectional TVS tube D3A is connected between the fifth pin and the sixth pin of the power relay K3-S, one end of the bidirectional TVS tube D3A is connected to the fifth pin of the power relay K3-S, and the other end of the bidirectional TVS tube D3A is connected to the sixth pin of the power relay K3-S.

10. The signal and charge switching control circuit of claim 1, wherein, A bidirectional TVS tube D2 is connected between the seventh pin and the eighth pin of the signal relay K2-S, one end of the bidirectional TVS tube D2 is connected to the seventh pin of the signal relay K2-S, and the other end of the bidirectional TVS tube D2 is connected to the eighth pin of the signal relay K2-S.

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