Signal and charging switching control circuit applied to relay

Abstract

The invention provides a signal and charging switching control circuit applied to a relay, which comprises 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, and is characterized in that 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 the signal relay K2-S to perform front and back signal switching 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 perform charging switching; the voltage conversion module is used for converting voltage for power supply. The system has the beneficial effects that signal switching of the signal relay and charging switching of the power relay can be uniformly controlled, and the working efficiency is improved.

Description

Technical Field

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

[0002] With the rapid development of electronic technology and computer technology, there are more and more electronic equipment and related control equipment. In order to better meet the needs, these electronic equipment and related control equipment are constantly pursuing miniaturization, integration and intelligence.

[0003] A relay is an electrical appliance that connects or disconnects a circuit based on changes in physical quantities such as voltage, current, temperature, speed or time. Its main function is protection and control.

[0004] Relay systems are usually used as control devices in product testing. With the continuous development of industry, the number of product ports is increasing, and higher requirements are placed on product testing efficiency. Relays may involve derivative extensions of signal relays and power relays. However, the current control circuit lacks a strategy for unified control of signal switching of signal relays and charging switching of power relays, which requires separate control in steps in actual operating scenarios, reducing work efficiency. Summary of the invention

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

[0006] The present invention provides a signal and charging switching control circuit applied to a relay, comprising: An operational amplifier control module, wherein a first input terminal of the operational amplifier control module is respectively connected to the fifth pin and the sixth pin of the signal relay K2-S to receive a CPR signal and a CPS signal and output a corresponding first control signal and a second control signal according to the CPR signal and the CPS signal; A first relay control module, wherein 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; A second relay control module, wherein 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 the power relay K4-R; A third relay control module, wherein the input end of the third relay control module is connected to the output end of the operational amplifier control module, and the output end of the third relay control module is connected to the sixth pin of the power relay K3-S; A voltage conversion module, wherein the input end of the voltage conversion module is connected to an external power supply, the first output end of the voltage conversion module is respectively connected to 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, and the second output end of the voltage conversion module is connected to the second input end of the operational amplifier control module; The first relay control module, the second relay control module and the third relay control module are used to control the signal relay K2-S to switch the front and rear signals according to the first control signal and the second control signal, and control the power relay K4-R and the power relay K3-S to switch the charging.

[0007] Compared with the prior art, this application has the following advantages: In the present 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 switches the front and rear signals of the signal relay K2-S, the second relay control module switches the power relay K4-R to a charging or power-off state, and the third relay control module switches the power relay K3-S to a charging or power-off state, thereby achieving unified switching control and improving work efficiency.

[0008] In a possible implementation, the operational amplifier control module includes: A varactor diode D9, wherein a cathode of the varactor diode D9 is connected to the fifth pin of the signal relay K2-S, and an anode of the varactor diode D9 is grounded; A resistor R10, one end of the resistor R10 is connected to the cathode of the varactor diode D9, and the other end of the resistor R10 is connected to the third pin of the operational amplifier control chip U1; 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 diode D9; 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; 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, and the fourth pin of the operational amplifier control chip U1 is connected to the second output end of the voltage conversion module; A capacitor C4, one end of the capacitor C4 is connected to one end of the resistor R6 and is 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 the resistor R11 being connected to the other end of the capacitor C4; A capacitor C1, one end of the capacitor C1 is connected to one end of the capacitor C4, and the other end of the capacitor C1 is connected to the other end of the resistor R11; A resistor R2, one end of the resistor R2 is connected to the other end of the capacitor C1; A diode D3, wherein a cathode of the diode D3 is connected to the other end of the resistor R2, and an anode of the diode D3 is respectively connected to a first pin and a second pin of the operational amplifier control chip U1; A varactor diode D10, wherein the cathode of the varactor diode D10 is connected to the sixth pin of the signal relay K2-S, and the other end of the varactor diode D10 is connected to the anode of the varactor diode D9; A resistor R17, one end of which is connected to the cathode of the varactor diode D10, and the other end of which is connected to the tenth pin of the operational amplifier control chip U1; a resistor R15, one end of the resistor R15 being connected to the other end of the resistor R17, and the other end of the resistor R15 being 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 the input end of the first relay control module; A resistor R7, one end of which is connected to the other end of the resistor R8, and the other end of which is respectively connected to the sixth pin and the seventh pin of the operational amplifier control chip U1; A capacitor C3, one end of the capacitor C3 is connected to the other end of the resistor R7, and the other end of the capacitor C3 is connected to one end of the resistor R8; A capacitor C6, one end of the capacitor C6 is connected to one end of the capacitor C3, and the other end of the capacitor C6 is connected to one end of the resistor R6; A diode D4, wherein the anode of the diode D4 is respectively connected to the eighth pin and the ninth pin of the operational amplifier control chip U1; A resistor R16, one end of the resistor R16 is connected to the cathode 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 the 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 being connected to the other end of the resistor R18, and the other end of the resistor R12 being 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 respectively connected to the thirteenth pin and the fourteenth pin of the operational amplifier control chip U1; 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 the input end of the first relay control module; a resistor R3, one end of the resistor R3 being connected to one end of the capacitor C8, and the other end of the resistor R3 being connected to the other end of the resistor R1; The cathode of the varactor diode D9 and the cathode of the varactor diode D10 serve as the first input end of the operational amplifier control module, the fourth pin of the operational amplifier control chip U1 serves 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 serve as the output end of the operational amplifier control module.

[0009] In a possible implementation manner, the first relay control module includes: A diode D15, wherein the anode of the diode D15 is connected to the output end of the operational amplifier control module; A resistor R6A, one end of which is connected to the cathode of the diode D15, and the other end of which is connected to the drain of the field effect transistor Q2; A diode D11, wherein the anode of the diode D11 is connected to the output end of the operational amplifier control module; A resistor R2A, one end of the resistor R2A is connected to the cathode of the diode D11, and the other end of the resistor R2A is connected to the gate of the field effect transistor Q2; 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 is grounded; 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; A field effect transistor Q6, wherein the gate of the field effect transistor Q6 is connected to one end of the resistor R14, the drain is connected to the eighth pin of the signal relay K2-S, and the source is connected to the other end of the resistor R14; The anode of the diode D15 and the anode of the diode D11 serve as the input end of the first relay control module, and the drain of the field effect transistor Q6 serves as the output end of the first relay control module.

[0010] In a possible implementation manner, the second relay control module includes: A diode D17, wherein the anode of the diode D17 is connected to the output end of the operational amplifier control module; A resistor R8A, one end of the resistor R8A is connected to the cathode of the diode D17, and the other end of the resistor R8A is connected to the drain of the field effect transistor Q4; A diode D13, wherein the anode of the diode D13 is connected to the output end of the operational amplifier control module; A resistor R4, one end of which is connected to the cathode of the diode D13, and the other end of which is connected to the gate of the field effect transistor Q4; A resistor R12A, one end of the resistor R12A is connected to the gate of the field effect transistor Q4, and the other end of the resistor R12A is connected to the source of the field effect transistor Q4 and grounded; A resistor R16A, one end of the resistor R16A is connected to the drain of the field effect transistor Q4, and the other end of the resistor R16A is connected to the source of the field effect transistor Q4; A field effect transistor Q8, wherein the gate of the field effect transistor Q8 is connected to one end of the resistor R16A, the drain is connected to the sixth pin of the signal relay K4-R, and the source is connected to the other end of the resistor R16A; The anode of the diode D17 and the anode of the diode D13 serve as the input end of the second relay control module, and the drain of the field effect transistor Q8 serves as the output end of the second relay control module.

[0011] In a possible implementation manner, the third relay control module includes: A diode D16, wherein the anode of the diode D16 is connected to the output end of the operational amplifier control module; A resistor R7A, one end of which is connected to the cathode of the diode D16, and the other end of which is connected to the drain of the field effect transistor Q3; A diode D12, wherein the anode of the diode D12 is connected to the output end of the operational amplifier control module; A resistor R5, one end of which is connected to the cathode of the diode D12, and the other end of which is connected to the gate of the field effect transistor Q3; A resistor R11A, one end of the resistor R11A is connected to the gate of the field effect transistor Q3, and the other end of the resistor R11A is connected to the source of the field effect transistor Q3 and is grounded; A resistor R15A, one end of the resistor R15A is connected to the drain of the field effect transistor Q3, and the other end of the resistor R15A is connected to the source of the field effect transistor Q3; A field effect transistor Q7, wherein the gate of the field effect transistor Q7 is connected to one end of the resistor R15A, the drain is connected to the sixth pin of the signal relay K3-S, and the source is connected to the other end of the resistor R15A; The anode of the diode D16 and the anode of the diode D12 serve as the input end of the third relay control module, and the drain of the field effect transistor Q7 serves as the output end of the third relay control module.

[0012] In a possible implementation, the voltage conversion module includes: A thermal relay FR1, one end of which is connected to the external power supply; A diode D6, wherein the anode of the diode D6 is connected to the other end of the thermal relay FR1, and the cathode of the diode D6 is respectively 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; A bidirectional TVS tube D5, one end of which is connected to the cathode of the diode D6, and the other end of which is grounded; A capacitor C12, one end of the capacitor C12 is connected to the cathode of the diode D6, and the other end of the capacitor C12 is connected to the other end of the bidirectional TVS tube D5; A capacitor C2, one end of the capacitor C2 is connected to the third pin of the voltage conversion chip U3, and the other end of the capacitor C2 is connected to the first pin of the voltage conversion chip U3; A capacitor C13, one end of the capacitor C13 is connected to the second pin of the voltage conversion chip U3, and the other end of the capacitor C13 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, and the other end of which is connected to the other end of the capacitor C13; One end of the thermal relay FR1 serves as the input end of the voltage conversion module, the cathode of the diode D6 serves as the first output end of the voltage conversion module, and one end of the capacitor C14 serves as the second output end of the voltage conversion module.

[0013] In a possible implementation, it also includes a connector J1, 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 respectively connected to the fifth pin of the signal relay K2-S and the first input end of the operational amplifier control module, 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 respectively connected to the sixth pin of the signal relay K2-S and the first input end of the operational amplifier control module, 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.

[0014] In a possible implementation, 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.

[0015] In a possible implementation, 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.

[0016] In a possible implementation, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of module connection of the present invention; Figure 2 The electrical schematic diagram of the operational amplifier control module of the present invention; Figure 3 is an electrical schematic diagram of a first relay control module of the present invention; Figure 4 is an electrical schematic diagram of a second relay control module of the present invention; Figure 5 is an electrical schematic diagram of a third relay control module of the present invention; Figure 6 is an electrical schematic diagram of the voltage conversion module of the present invention; Figure 7 A pin diagram of the connector of the present invention; Explanation of the accompanying drawings: 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

[0018] First, those skilled in the art should understand that these implementations 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 make adjustments to them as needed to adapt to specific application scenarios.

[0019] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figure 1-Figure 6 The embodiment of the present application discloses a signal and charging switching control circuit applied to a relay, including 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 a CPS signal and a CPR signal and generate a first control signal and a second control signal. Based on the first control signal and the second control signal, the first relay control module 2 is used to switch the front and back signals of the signal relay K2-S, the second relay control module 3 is used to switch the power relay K4-R to a charging or power-off state, and the third relay control module 4 is used to switch the power relay K3-S to a charging or power-off state. The voltage conversion module 5 is used to convert the voltage of an external power supply into a 12V voltage to power the signal relay K2-S, the power relay K4-R and the power relay K3-S, and convert a 5V voltage to power the operational amplifier control chip U1.

[0021] Continue to see Figure 1-Figure 6The operational amplifier control module 1 includes an operational amplifier control chip U1, a diode D3, a diode D4, a varactor diode D9, a varactor diode D10, a resistor R1, a resistor R2, a resistor R3, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C1, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10 and a capacitor C11; the first relay control module 2 includes a diode D11, a diode D15, a resistor R2A, a resistor R6A, a resistor R10A, a resistor R14, a field effect transistor Q2 and a field effect transistor Q6; the second relay control module 3 includes a diode D13, a diode D17, a resistor R4, a resistor R8, a resistor R12A, a resistor R16A, a field effect transistor Q4 and a field effect transistor Q8; The third relay control module 4 includes a diode D12, a diode D16, a resistor R5, a resistor R7, a resistor R11A, a resistor R15A, a field effect transistor Q3 and a field effect transistor Q7; the voltage conversion module 5 includes a voltage conversion chip U3, a thermal relay FR1, a bidirectional TVS tube D5, a diode D6, a capacitor C2, a capacitor C12, a capacitor C13 and a capacitor C14; the input CPS and CPR signals are amplified by four groups of operational amplifiers of the operational amplifier control module 1, and the corresponding first control signal OUTA and second control signal OUTB are output through the logic circuit to control the switching of the field effect transistor Q2, the field effect transistor Q3, the field effect transistor Q4, the field effect transistor Q6, the field effect transistor Q7, and the field effect transistor Q8, and the switching of the front and rear signals and charging of the control signal relay K2-S, the power relay K3-S, and the power relay K4-R are controlled. The model of the operational amplifier control chip U1 is TSSOP14.

[0022] Continue to see Figure 2-Figure 5 When the input signal CPS is at a high level, the second control signal OUTB becomes high level, the field effect transistors Q4, Q6 and Q7 are turned on, and the field effect transistors Q2, Q3 and Q8 are turned off, ensuring that the first control signal OUTA is at a low level; when the input signal CPR is at a high level, the first control signal OUTA becomes high level, the field effect transistors Q2, Q3 and Q8 are turned on, and the field effect transistors Q4, Q6 and Q7 are turned off, ensuring that the second control signal OUTB is at a low level. In this way, when the state of any input signal changes, the state of the output control signal can be changed synchronously, realizing field effect transistor interlocking.

[0023] Continue to see Figure 6 The ultra-low power consumption LDO power supply is converted into 5V through the voltage conversion module 5 to power the four-way operational amplifier, and the static operating current of the whole machine is adjusted to <100uA through the peripheral circuit.

[0024] Continue to see Figure 2 By matching the current limiting resistors R10 and R17 and the pull-down resistors R9 and R15, the differential capacitors C7 and C11 provide DC bias and filter out the common-mode noise in the differential signal, effectively reducing the amplitude of the input signal and the anti-interference ability of the op amp control.

[0025] Continue to see Figure 7 , also includes a connector J1, 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 respectively connected to the fifth pin of the signal relay K2-S and the first input end of the operational amplifier control module 1, 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 respectively connected to the sixth pin of the signal relay K2-S and the first input end of the operational amplifier control module 1, 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.

[0026] Continue to see Figure 4 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.

[0027] Continue to see Figure 5 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.

[0028] Continue to see Figure 3 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.

[0029] Continue to see Figure 4 and Figure 5 The third pin of the 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 the 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, where the L interface represents the live wire and the N interface represents the neutral wire.

[0030] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A signal and charging switching control circuit applied to a relay, characterized in that: include: An operational amplifier control module (1), wherein a first input end of the operational amplifier control module (1) is respectively connected to a fifth pin and a sixth pin of a signal relay K2-S to receive a CPR signal and a CPS signal and output a corresponding first control signal and a second control signal according to the CPR signal and the CPS signal; A first relay control module (2), wherein an input end of the first relay control module (2) is connected to an output end of the operational amplifier control module (1), and an output end of the first relay control module (2) is connected to an eighth pin of the signal relay K2-S; A second relay control module (3), wherein an input end of the second relay control module (3) is connected to an output end of the operational amplifier control module (1), and an output end of the second relay control module (3) is connected to a sixth pin of a power relay K4-R; A third relay control module (4), wherein an input end of the third relay control module (4) is connected to an output end of the operational amplifier control module (1), and an output end of the third relay control module (4) is connected to a sixth pin of a power relay K3-S; A voltage conversion module (5), wherein an input end of the voltage conversion module (5) is connected to an external power supply, a first output end of the voltage conversion module (5) is respectively connected to 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, and a second output end of the voltage conversion module (5) is connected to the second input end 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 to control the signal relay K2-S to perform forward and backward signal switching according to the first control signal and the second control signal, and to control the power relay K4-R and the power relay K3-S to perform charging switching.

2. The signal and charging switching control circuit according to claim 1, characterized in that: The operational amplifier control module (1) comprises: a varactor diode D9, wherein a cathode of the varactor diode D9 is connected to the fifth pin of the signal relay K2-S, and an anode of the varactor diode D9 is grounded; A resistor R10, one end of the resistor R10 is connected to the cathode of the varactor diode D9, and the other end of the resistor R10 is connected to the third pin of the operational amplifier control chip U1; 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 diode D9; 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; a resistor R6, one end of the resistor R6 being connected to the other end of the capacitor C7, the other end of the resistor R6 being connected to the fifth pin of the operational amplifier control chip U1, and the fourth pin of the operational amplifier control chip U1 being connected to the second output end of the voltage conversion module (5); A capacitor C4, one end of the capacitor C4 is connected to one end of the resistor R6 and is 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 the resistor R11 being connected to the other end of the capacitor C4; A capacitor C1, one end of the capacitor C1 is connected to one end of the capacitor C4, and the other end of the capacitor C1 is connected to the other end of the resistor R11; A resistor R2, one end of the resistor R2 is connected to the other end of the capacitor C1; A diode D3, wherein a cathode of the diode D3 is connected to the other end of the resistor R2, and an anode of the diode D3 is respectively connected to a first pin and a second pin of the operational amplifier control chip U1; A varactor diode D10, wherein the cathode of the varactor diode D10 is connected to the sixth pin of the signal relay K2-S, and the other end of the varactor diode D10 is connected to the anode of the varactor diode D9; A resistor R17, one end of which is connected to the cathode of the varactor diode D10, and the other end of which is connected to the tenth pin of the operational amplifier control chip U1; a resistor R15, one end of the resistor R15 being connected to the other end of the resistor R17, and the other end of the resistor R15 being 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 being connected to the other end of the capacitor C11, and the other end of the resistor R8 being connected to the input end of the first relay control module (2); A resistor R7, one end of which is connected to the other end of the resistor R8, and the other end of which is respectively connected to the sixth pin and the seventh pin of the operational amplifier control chip U1; A capacitor C3, one end of the capacitor C3 is connected to the other end of the resistor R7, and the other end of the capacitor C3 is connected to one end of the resistor R8; A capacitor C6, one end of the capacitor C6 is connected to one end of the capacitor C3, and the other end of the capacitor C6 is connected to one end of the resistor R6; A diode D4, wherein the anode of the diode D4 is respectively connected to the eighth pin and the ninth pin of the operational amplifier control chip U1; A resistor R16, one end of the resistor R16 is connected to the cathode 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 the 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 being connected to the other end of the resistor R18, and the other end of the resistor R12 being 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 respectively connected to the thirteenth pin and the fourteenth pin of the operational amplifier control chip U1; 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 the input end of the first relay control module (2); a resistor R3, one end of the resistor R3 being connected to one end of the capacitor C8, and the other end of the resistor R3 being connected to the other end of the resistor R1; The cathode of the varactor diode D9 and the cathode of the varactor diode D10 serve as the first input terminal of the operational amplifier control module (1), the fourth pin of the operational amplifier control chip U1 serves as the second input terminal of the operational amplifier control module (1), and the other end of the resistor R17 and the other end of the resistor R1 serve as the output terminal of the operational amplifier control module (1).

3. The signal and charging switching control circuit according to claim 1, characterized in that: The first relay control module (2) comprises: A diode D15, wherein the anode of the diode D15 is connected to the output end of the operational amplifier control module (1); A resistor R6A, one end of which is connected to the cathode of the diode D15, and the other end of which is connected to the drain of the field effect transistor Q2; A diode D11, wherein the anode of the diode D11 is connected to the output end of the operational amplifier control module (1); A resistor R2A, one end of the resistor R2A is connected to the cathode of the diode D11, and the other end of the resistor R2A is connected to the gate of the field effect transistor Q2; 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 is grounded; 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; A field effect transistor Q6, wherein the gate of the field effect transistor Q6 is connected to one end of the resistor R14, the drain is connected to the eighth pin of the signal relay K2-S, and the source is connected to the other end of the resistor R14; The anode of the diode D15 and the anode of the diode D11 serve as input terminals of the first relay control module (2), and the drain of the field effect transistor Q6 serves as an output terminal of the first relay control module (2).

4. The signal and charging switching control circuit according to claim 1, characterized in that: The second relay control module (3) comprises: A diode D17, wherein the anode of the diode D17 is connected to the output end of the operational amplifier control module (1); A resistor R8A, one end of the resistor R8A is connected to the cathode of the diode D17, and the other end of the resistor R8A is connected to the drain of the field effect transistor Q4; A diode D13, wherein the anode of the diode D13 is connected to the output end of the operational amplifier control module (1); A resistor R4, one end of which is connected to the cathode of the diode D13, and the other end of which is connected to the gate of the field effect transistor Q4; A resistor R12A, one end of the resistor R12A is connected to the gate of the field effect transistor Q4, and the other end of the resistor R12A is connected to the source of the field effect transistor Q4 and grounded; A resistor R16A, one end of the resistor R16A is connected to the drain of the field effect transistor Q4, and the other end of the resistor R16A is connected to the source of the field effect transistor Q4; A field effect transistor Q8, wherein the gate of the field effect transistor Q8 is connected to one end of the resistor R16A, the drain is connected to the sixth pin of the signal relay K4-R, and the source is connected to the other end of the resistor R16A; The anode of the diode D17 and the anode of the diode D13 serve as the input end of the second relay control module (3), and the drain of the field effect transistor Q8 serves as the output end of the second relay control module (3).

5. The signal and charging switching control circuit according to claim 1, characterized in that: The third relay control module (4) comprises: A diode D16, wherein the anode of the diode D16 is connected to the output end of the operational amplifier control module (1); A resistor R7A, one end of which is connected to the cathode of the diode D16, and the other end of which is connected to the drain of the field effect transistor Q3; A diode D12, wherein the anode of the diode D12 is connected to the output end of the operational amplifier control module (1); A resistor R5, one end of which is connected to the cathode of the diode D12, and the other end of which is connected to the gate of the field effect transistor Q3; A resistor R11A, one end of the resistor R11A is connected to the gate of the field effect transistor Q3, and the other end of the resistor R11A is connected to the source of the field effect transistor Q3 and is grounded; A resistor R15A, one end of the resistor R15A is connected to the drain of the field effect transistor Q3, and the other end of the resistor R15A is connected to the source of the field effect transistor Q3; A field effect transistor Q7, wherein the gate of the field effect transistor Q7 is connected to one end of the resistor R15A, the drain is connected to the sixth pin of the signal relay K3-S, and the source is connected to the other end of the resistor R15A; The anode of the diode D16 and the anode of the diode D12 serve as input terminals of the third relay control module (4), and the drain of the field effect transistor Q7 serves as an output terminal of the third relay control module (4).

6. The signal and charging switching control circuit according to claim 1, characterized in that: The voltage conversion module (5) comprises: A thermal relay FR1, one end of which is connected to the external power supply; A diode D6, wherein the anode of the diode D6 is connected to the other end of the thermal relay FR1, and the cathode of the diode D6 is respectively 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; A bidirectional TVS tube D5, one end of which is connected to the cathode of the diode D6, and the other end of which is grounded; A capacitor C12, one end of the capacitor C12 is connected to the cathode of the diode D6, and the other end of the capacitor C12 is connected to the other end of the bidirectional TVS tube D5; A capacitor C2, one end of the capacitor C2 is connected to the third pin of the voltage conversion chip U3, and the other end of the capacitor C2 is connected to the first pin of the voltage conversion chip U3; A capacitor C13, one end of the capacitor C13 is connected to the second pin of the voltage conversion chip U3, and the other end of the capacitor C13 is connected to the first pin of the voltage conversion chip U3; A capacitor C14, one end of the capacitor C14 is respectively connected to one end of the capacitor C13 and the second input end of the operational amplifier control module (1), and the other end of the capacitor C14 is connected to the other end of the capacitor C13; One end of the thermal relay FR1 serves as the input end of the voltage conversion module (5), the cathode of the diode D6 serves as the first output end of the voltage conversion module (5), and one end of the capacitor C14 serves as the second output end of the voltage conversion module (5).

7. The signal and charging switching control circuit according to claim 6, characterized in that: It also includes a connector J1, 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 respectively connected to the fifth pin of the signal relay K2-S and the first input end of the operational amplifier control module (1), 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 respectively connected to the sixth pin of the signal relay K2-S and the first input end of the operational amplifier control module (1), 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 charging switching control circuit according to claim 1, characterized in that: 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 charging switching control circuit according to claim 1, characterized in that: 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 charging switching control circuit according to claim 1, characterized in that: 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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