A signal and charging switching control circuit suitable for relays

Abstract

The present invention provides a signal and charging switching control circuit suitable for relays, comprising a first signal output module, a second signal output module, a first relay control module, a second relay control module, a third relay control module, and a voltage conversion module. The first signal output module is configured to receive a CPS signal and output a first control signal, the second signal output module is configured to receive a CPR signal and output a second control signal, and the first, second, and third relay control modules are configured to control the signal relay K2 to perform forward and backward signal switching, and to control the power relays K1 and K3 to perform charging switching, based on the first and second control signals. The beneficial effect is that the present invention can uniformly control the signal switching of the signal relays and the charging switching of the power relays, thereby improving work efficiency.

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 suitable for relays. Background Art

[0002] With the rapid development of electronic technology and computer technology, there are more and more electronic devices and related control devices. 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 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 commonly 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 unified control strategy for signal switching of signal relays and charging switching of power relays. As a result, separate control is required in actual operating scenarios, which reduces 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 suitable for relays.

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

[0007] a first signal output module, wherein a first input end of the first signal output module is connected to the fifth pin of the signal relay K2 to receive a CPS signal and output a corresponding first control signal according to the CPS signal;

[0008] a second signal output module, wherein a first input end of the second signal output module is connected to the third pin of the signal relay K2 to receive a CPR signal and output a corresponding second control signal according to the CPR signal;

[0009] A first relay control module, wherein an input end of the first relay control module is connected to an output end of the first signal output module and an output end of the second signal output module respectively, and an output end of the first relay control module is connected to a second pin of the power relay K1;

[0010] A second relay control module, wherein the input end of the second relay control module is connected to the output end of the first signal output module and the output end of the second signal output module respectively, and the output end of the second relay control module is connected to the twelfth pin of the signal relay K2;

[0011] A third relay control module, wherein the input end of the third relay control module is connected to the output end of the first signal output module and the output end of the second signal output module respectively, and the output end of the third relay control module is connected to the second pin of the power relay K3;

[0012] a voltage conversion module, wherein the input end of the voltage conversion module is connected to the external power supply VCC, and the output end of the voltage conversion module is respectively connected to the second input end of the first signal output module, the second input end of the second signal output module, the first pin of the signal relay K2, the first pin of the power relay K1, and the first pin of the power relay K3;

[0013] The first relay control module, the second relay control module and the third relay control module are used to control the signal relay K2 to perform forward and backward signal switching according to the first control signal and the second control signal, and control the power relay K1 and the power relay K3 to perform charging switching.

[0014] Compared with the prior art, this application has the following advantages:

[0015] In this application, the first signal output module is responsible for receiving the CPS signal and generating the first control signal, and the second signal output module is responsible for receiving the CPR signal and generating the second control signal. Based on the first control signal and the second control signal, the first relay control module is used to switch the power relay K1 between charging or power-off states, the second relay control module is used to switch the front and back signals of the signal relay K2, and the third relay control module is used to switch the power relay K3 between charging or power-off states, thereby realizing unified switching control and improving work efficiency.

[0016] In a possible implementation, the first signal output module includes:

[0017] a bidirectional TVS tube D14, wherein a second pin of the bidirectional TVS tube D14 is connected to a third pin of the signal relay;

[0018] a diode D4, wherein the anode of the diode D4 is connected to the second pin of the bidirectional TVS tube D14;

[0019] a resistor R6, one end of the resistor R6 being connected to the cathode of the diode D4;

[0020] a resistor R9, one end of the resistor R9 being connected to the first pin of the bidirectional TVS tube D14, and the other end of the resistor R9 being connected to the other end of the resistor R6;

[0021] a resistor R7, one end of the resistor R7 being connected to the other end of the resistor R6, and the other end of the resistor R7 being connected to the gate of the field effect transistor Q3;

[0022] a capacitor C3, one end of the capacitor C3 being connected to the other end of the resistor R7, and the other end of the capacitor C3 being connected to one end of the resistor R9;

[0023] a capacitor C4, one end of the capacitor C4 being connected to the other end of the resistor R7, and the other end of the capacitor C4 being connected to the other end of the capacitor C3 and the source of the field effect transistor Q3;

[0024] a capacitor C2, one end of the capacitor C2 being connected to the source of the field effect transistor Q3 and grounded;

[0025] a resistor R2, one end of which is connected to the output end of the voltage conversion module;

[0026] a resistor R3, one end of the resistor R3 being connected to the output end of the voltage conversion module;

[0027] A photocoupler U1, wherein a first pin of the photocoupler U1 is connected to the other end of the resistor R3, a second pin is connected to the drain of the field effect transistor Q3, a third pin is respectively connected to the other end of the capacitor C2, an input end of the first relay control module, an input end of the second relay control module, and an input end of the third relay control module, and a fourth pin is connected to the other end of the resistor R3;

[0028] The second pin of the bidirectional TVS tube D14 serves as the first input end of the first signal output module, one end of the resistor R2 and one end of the resistor R3 serve as the second input end of the first signal output module, and the third pin of the optocoupler U1 serves as the output end of the first signal output module.

[0029] In a possible implementation, the second signal output module includes:

[0030] a bidirectional TVS tube D15, wherein a second pin of the bidirectional TVS tube D15 is connected to a fifth pin of the signal relay;

[0031] a diode D10, wherein the anode of the diode D10 is connected to the second pin of the bidirectional TVS tube D15;

[0032] a resistor R19, one end of the resistor R19 being connected to the cathode of the diode D10;

[0033] a resistor R23, one end of the resistor R23 being connected to the first pin of the bidirectional TVS diode D15, and the other end of the resistor R23 being connected to the other end of the resistor R19;

[0034] a resistor R20, one end of the resistor R20 being connected to the other end of the resistor R19, and the other end of the resistor R20 being connected to the gate of the field effect transistor Q8;

[0035] a capacitor C8, one end of the capacitor C8 being connected to the other end of the resistor R20, and the other end of the capacitor C8 being connected to one end of the resistor R23;

[0036] a capacitor C9, one end of the capacitor C9 being connected to the other end of the resistor R20, and the other end of the capacitor C9 being connected to the other end of the capacitor C8 and the source of the field effect transistor Q8;

[0037] a capacitor C6, one end of the capacitor C6 being connected to the source of the field effect transistor Q8 and grounded;

[0038] a resistor R17, one end of the resistor R17 being connected to the output end of the voltage conversion module;

[0039] a resistor R16, one end of the resistor R16 being connected to the output end of the voltage conversion module;

[0040] a photoelectric coupler U2, wherein a first pin of the photoelectric coupler U2 is connected to the other end of the resistor R17, a second pin is connected to the drain of the field effect transistor Q8, a third pin is respectively connected to the other end of the capacitor C6, an input end of the first relay control module, an input end of the second relay control module, and an input end of the third relay control module, and a fourth pin is connected to the other end of the resistor R16;

[0041] The second pin of the bidirectional TVS tube D15 serves as the first input end of the second signal output module, one end of the resistor R16 and one end of the resistor R17 serve as the second input end of the second signal output module, and the third pin of the optocoupler U2 serves as the output end of the second signal output module.

[0042] In a possible implementation, the first relay control module includes:

[0043] a diode D2, wherein the anode of the diode D2 is connected to the output end of the first signal output module;

[0044] a resistor R1, one end of the resistor R1 being connected to the cathode of the diode D2, and the other end of the resistor R1 being connected to the drain of the field effect transistor Q2;

[0045] a diode D3, wherein the anode of the diode D3 is connected to the output end of the second signal output module;

[0046] a resistor R4, one end of the resistor R4 being connected to the cathode of the diode D3, and the other end of the resistor R4 being connected to the gate of the field effect transistor Q2;

[0047] a resistor R8, one end of the resistor R8 being connected to the other end of the resistor R4, and the other end of the resistor R8 being connected to the source of the field effect transistor Q2 and grounded;

[0048] a resistor R5, one end of the resistor R5 being connected to the drain of the field effect transistor Q2, and the other end of the resistor R5 being connected to the source of the field effect transistor Q2;

[0049] a capacitor C1, one end of the capacitor C1 being connected to one end of the resistor R5, and the other end of the capacitor C1 being connected to the other end of the resistor R5;

[0050] a field effect transistor Q1 , wherein the gate of the field effect transistor Q1 is connected to one end of the capacitor C1 , the source is connected to the other end of the capacitor C1 , and the drain is connected to the second pin of the power relay K1 ;

[0051] The anode of the diode D2 and the anode of the diode D3 serve as input terminals of the first relay control module, and the drain of the field effect transistor Q1 serves as an output terminal of the first relay control module.

[0052] In a possible implementation, the second relay control module includes:

[0053] a diode D6, wherein the anode of the diode D6 is connected to the output end of the second signal output module;

[0054] a resistor R12, one end of the resistor R12 being connected to the cathode of the diode D6, and the other end of the resistor R12 being connected to the drain of the field effect transistor Q5;

[0055] a diode D7, wherein the anode of the diode D7 is connected to the output end of the first signal output module;

[0056] a resistor R13, one end of the resistor R13 being connected to the cathode of the diode D7, and the other end of the resistor R13 being connected to the gate of the field effect transistor Q5;

[0057] a resistor R15, one end of the resistor R15 being connected to the other end of the resistor R13, and the other end of the resistor R15 being connected to the source of the field effect transistor Q5 and grounded;

[0058] a resistor R14, one end of the resistor R14 being connected to the drain of the field effect transistor Q5, and the other end of the resistor R14 being connected to the source of the field effect transistor Q5;

[0059] a capacitor C5, one end of the capacitor C5 being connected to one end of the resistor R14, and the other end of the capacitor C5 being connected to the other end of the resistor R14;

[0060] a field effect transistor Q4 , wherein the gate of the field effect transistor Q4 is connected to one end of the capacitor C5 , the source is connected to the other end of the capacitor C5 , and the drain is connected to the twelfth pin of the signal relay K2 ;

[0061] The anode of the diode D6 and the anode of the diode D7 serve as the input end of the second relay control module, and the drain of the field effect transistor Q4 serves as the output end of the second relay control module.

[0062] In a possible implementation, the third relay control module includes:

[0063] a diode D9, wherein the anode of the diode D9 is connected to the output end of the second signal output module;

[0064] a resistor R18, one end of the resistor R18 being connected to the cathode of the diode D9, and the other end of the resistor R18 being connected to the drain of the field effect transistor Q7;

[0065] a diode D11, wherein the anode of the diode D11 is connected to the output end of the first signal output module;

[0066] a resistor R21, one end of the resistor R21 being connected to the cathode of the diode D11, and the other end of the resistor R21 being connected to the gate of the field effect transistor Q7;

[0067] a resistor R24, one end of the resistor R24 ​​being connected to the other end of the resistor R21, and the other end of the resistor R24 ​​being connected to the source of the field effect transistor Q7 and grounded;

[0068] a resistor R22, one end of the resistor R22 being connected to the drain of the field effect transistor Q7, and the other end of the resistor R22 being connected to the source of the field effect transistor Q7;

[0069] a capacitor C7, one end of the capacitor C7 being connected to one end of the resistor R22, and the other end of the capacitor C7 being connected to the other end of the resistor R22;

[0070] a field effect transistor Q6 , wherein the gate of the field effect transistor Q6 is connected to one end of the capacitor C7 , the source is connected to the other end of the capacitor C7 , and the drain is connected to the second pin of the power relay K3 ;

[0071] The anode of the diode D9 and the anode of the diode D11 serve as the input end of the third relay control module, and the drain of the field effect transistor Q6 serves as the output end of the third relay control module.

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

[0073] a Schottky diode D12, wherein the anode of the Schottky diode D12 is connected to the external power supply, and the cathode of the Schottky diode D12 is respectively connected to the second input terminal of the first signal output module, the second input terminal of the second signal output module, the first pin of the signal relay K2, the first pin of the power relay K1, and the first pin of the power relay K3;

[0074] a bidirectional TVS tube D13, one end of the bidirectional TVS tube D13 being connected to the anode of the Schottky diode D12, and the other end of the bidirectional TVS tube D13 being grounded;

[0075] a capacitor C10, one end of the capacitor C10 being connected to the cathode of the Schottky diode D12, and the other end of the capacitor C10 being connected to the other end of the bidirectional TVS diode D13;

[0076] a capacitor C11, one end of the capacitor C11 being connected to one end of the capacitor C10, and the other end of the capacitor C11 being connected to the other end of the capacitor C10;

[0077] The anode of the Schottky diode D12 serves as the input end of the voltage conversion module, and the cathode of the Schottky diode D12 serves as the output end of the voltage conversion module.

[0078] In a possible implementation, a Schottky diode D1 is connected between the first pin and the second pin of the power relay K1 , the anode of the Schottky diode D1 is connected to the second pin of the power relay K1 , and the cathode of the Schottky diode D1 is connected to the first pin of the power relay K1 .

[0079] In a possible implementation, a Schottky diode D5 is connected between the first pin and the twelfth pin of the signal relay K2, the anode of the Schottky diode D5 is connected to the twelfth pin of the signal relay K2, and the cathode of the Schottky diode D5 is connected to the first pin of the signal relay K2.

[0080] In a possible implementation, a Schottky diode D8 is connected between the first pin and the second pin of the power relay K3 , the anode of the Schottky diode D8 is connected to the second pin of the power relay K3 , and the cathode of the Schottky diode D8 is connected to the first pin of the power relay K3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 This is a schematic diagram of module connection of the present invention;

[0082] Figure 2 This is an electrical schematic diagram of the first signal output module of the present invention;

[0083] Figure 3 This is an electrical schematic diagram of the second signal output module of the present invention;

[0084] Figure 4 is an electrical schematic diagram of the first relay control module of the present invention;

[0085] Figure 5 is an electrical schematic diagram of the second relay control module of the present invention;

[0086] Figure 6 is an electrical schematic diagram of the third relay control module of the present invention;

[0087] Figure 7 This is an electrical schematic diagram of the voltage conversion module of the present invention;

[0088] Explanation of the accompanying drawings: 1. First signal output module; 2. Second signal output module; 3. First relay control module; 4. Second relay control module; 5. Third relay control module; 6. Voltage conversion module. DETAILED DESCRIPTION

[0089] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0090] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0091] See also Figure 1-Figure 7The embodiment of the present application discloses a signal and charging switching control circuit suitable for a relay, including a first signal output module 1, a second signal output module 2, a first relay control module 3, a second relay control module 4, a third relay control module 5 and a voltage conversion module 6, wherein the first signal output module 1 is used to receive the CPS signal of the signal relay K2 and output a corresponding first control signal according to the CPS signal, the second signal output module 2 is used to receive the CPR signal of the signal relay K2 and output a corresponding second control signal according to the CPR signal, the first relay control module 3 is used to switch the power relay K1 between charging or power-off states, the second relay control module 4 is used to switch the front and back signals of the signal relay K2, the third relay control module 5 is used to switch the power relay K3 between charging or power-off states, and the voltage conversion module 6 is used to convert the voltage of the external power supply VCC into a 12V voltage for power supply.

[0092] Continue to see Figures 1-6 The first signal output module 1 includes a bidirectional TVS tube D14, a diode D4, a resistor R2, a resistor R3, a resistor R6, a resistor R7, a resistor R9, a capacitor C2, a capacitor C3, a capacitor C4, a field effect tube Q3 and a photocoupler U1. The second signal output module 2 includes a bidirectional TVS tube D15, a diode D10, a resistor R16, a resistor R17, a resistor R19, a resistor R20, a resistor R23, a field effect tube Q8, a capacitor C6, a capacitor C8, a capacitor C9 and a photocoupler U2. The first relay control module 3 includes a diode D2, a diode D3, a resistor R1, a field effect tube Q1, a field effect tube Q2, a resistor R4, a resistor R5, a resistor R8 and a capacitor C1. The second relay control module 4 includes a diode D6, a diode D7, a resistor R12, a resistor R 13, resistor R14, resistor R15, field-effect transistor Q4, field-effect transistor Q5 and capacitor C5, the third relay control module 5 includes a diode D9, a resistor R18, a resistor R21, a resistor R22, a resistor R24, a field-effect transistor Q6, a field-effect transistor Q7, a diode D11 and a capacitor C7, and controls the field-effect transistor Q8 and the field-effect transistor Q3 switches by inputting CPS and CPR signals to turn on the photoelectric couplers U1 and U2, and outputs the corresponding first control signal OUTA and second control signal OUTB through the photoelectric couplers U1 and U2 to control the switching of the field-effect transistors Q1, field-effect transistor Q2, field-effect transistor Q4, field-effect transistor Q5, field-effect transistor Q6 and field-effect transistor Q7, and the switching of the front and rear signals and charging of the control signal relay K2, the power relay K1, and the power relay K3.

[0093] Continue to see Figures 1-6When the input signal CPS is at a high level, the second control signal OUTB becomes high, and the field effect transistors Q2, Q4 and Q6 are turned on, while the field effect transistors Q1, Q5 and Q7 are turned off, ensuring that the first control signal OUTA is low; when the input signal CPR is at a high level, the first control signal OUTA output by the optocouplers U1 and U2 becomes high, and the field effect transistors Q1, Q5 and Q7 are turned on, while the field effect transistors Q2, Q4 and Q6 are turned off, ensuring that the second control signal OUTB is low. 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.

[0094] Continue to see Figure 2 and Figure 3 When the CPS and CPR inputs are high-level signals, the field-effect transistors Q8 and Q3 are turned on to power the optocouplers U1 and U2 to achieve a static operating current of <100uA.

[0095] Continue to see Figure 2 and Figure 3 By matching the resistance of the R6 and R19 current-limiting resistors and the R9 and R23 pull-down resistors, the C4 and C9 differential capacitors provide DC bias and filter out the common-mode noise in the differential signal, effectively reducing the amplitude of the input signal and the control anti-interference ability of the optocouplers U1 and U2.

[0096] Continue to see Figure 7 The voltage conversion module 6 includes a Schottky diode D12, a bidirectional TVS tube D13, a capacitor C10 and a capacitor C11, and is used to convert the voltage of the external power supply VCC into a 12V voltage for power supply.

[0097] Continue to see Figure 4-Figure 6 A Schottky diode D1 is connected between the first and second pins of the power relay K1, a Schottky diode D5 is connected between the first and twelfth pins of the signal relay K2, and a Schottky diode D8 is connected between the first and second pins of the power relay K3.

[0098] Continue to see Figure 4-Figure 6 The eighth pin of the signal relay K2 is connected to the resistor R11, the resistor R11 is grounded, the tenth pin of the signal relay K2 outputs the PPR signal, the fourth pin outputs the CP signal, and the ninth pin outputs the PP signal. The sixth pin of the power relay K1 is connected to the NR1 interface, the fourth pin is connected to the LR1 interface, the fifth pin is connected to the N1 interface, and the third pin is connected to the L1 interface. The fourth pin of the power relay K3 is connected to the L1 interface, the sixth pin is connected to the N1 interface, the third pin is connected to the LS1 interface, and the fifth pin is connected to the NS1 interface.

[0099] 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" 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0100] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A signal and charging switching control circuit suitable for a relay, characterized in that: include: A first signal output module (1), wherein a first input end of the first signal output module (1) is connected to a fifth pin of the signal relay K2 to receive a CPS signal and output a corresponding first control signal according to the CPS signal; a second signal output module (2), wherein a first input end of the second signal output module (2) is connected to a third pin of the signal relay K2 to receive a CPR signal and output a corresponding second control signal according to the CPR signal; a first relay control module (3), wherein the input end of the first relay control module (3) is connected to the output ends of the first signal output module (1) and the second signal output module (2), respectively, and the output end of the first relay control module (3) is connected to the second pin of the power relay K1; a second relay control module (4), wherein the input end of the second relay control module (4) is connected to the output ends of the first signal output module (1) and the second signal output module (2), respectively, and the output end of the second relay control module (4) is connected to the twelfth pin of the signal relay K2; a third relay control module (5), wherein the input end of the third relay control module (5) is connected to the output ends of the first signal output module (1) and the second signal output module (2), respectively, and the output end of the third relay control module (5) is connected to the second pin of the power relay K3; A voltage conversion module (6), wherein the input end of the voltage conversion module (6) is connected to an external power supply VCC, and the output end of the voltage conversion module (6) is respectively connected to the second input end of the first signal output module (1), the second input end of the second signal output module (2), the first pin of the signal relay K2, the first pin of the power relay K1, and the first pin of the power relay K3; The first relay control module (3), the second relay control module (4) and the third relay control module (5) are used to control the signal relay K2 to perform forward and backward signal switching according to the first control signal and the second control signal, and to control the power relay K1 and the power relay K3 to perform charging switching; The voltage conversion module (6) comprises: a Schottky diode D12, wherein the anode of the Schottky diode D12 is connected to the external power supply VCC, and the cathode of the Schottky diode D12 is respectively connected to the second input terminal of the first signal output module (1), the second input terminal of the second signal output module (2), the first pin of the signal relay K2, the first pin of the power relay K1, and the first pin of the power relay K3; a bidirectional TVS tube D13, one end of the bidirectional TVS tube D13 being connected to the anode of the Schottky diode D12, and the other end of the bidirectional TVS tube D13 being grounded; a capacitor C10, one end of the capacitor C10 being connected to the cathode of the Schottky diode D12, and the other end of the capacitor C10 being connected to the other end of the bidirectional TVS diode D13; a capacitor C11, one end of the capacitor C11 being connected to one end of the capacitor C10, and the other end of the capacitor C11 being connected to the other end of the capacitor C10; The positive electrode of the Schottky diode D12 serves as the input end of the voltage conversion module (6), and the negative electrode of the Schottky diode D12 serves as the output end of the voltage conversion module (6).

2. The signal and charging switching control circuit according to claim 1, characterized in that: The first signal output module (1) comprises: A bidirectional TVS tube D14, wherein a second pin of the bidirectional TVS tube D14 is connected to a third pin of the signal relay K2; a diode D4, wherein the anode of the diode D4 is connected to the second pin of the bidirectional TVS tube D14; a resistor R6, one end of the resistor R6 being connected to the cathode of the diode D4; a resistor R9, one end of the resistor R9 being connected to the first pin of the bidirectional TVS tube D14, and the other end of the resistor R9 being connected to the other end of the resistor R6; a resistor R7, one end of the resistor R7 being connected to the other end of the resistor R6, and the other end of the resistor R7 being connected to the gate of the field effect transistor Q3; a capacitor C3, one end of the capacitor C3 being connected to the other end of the resistor R7, and the other end of the capacitor C3 being connected to one end of the resistor R9; a capacitor C4, one end of the capacitor C4 being connected to the other end of the resistor R7, and the other end of the capacitor C4 being connected to the other end of the capacitor C3 and the source of the field effect transistor Q3; a capacitor C2, one end of the capacitor C2 being connected to the source of the field effect transistor Q3 and grounded; a resistor R2, one end of the resistor R2 being connected to the output end of the voltage conversion module (6); a resistor R3, one end of the resistor R3 being connected to the output end of the voltage conversion module (6); A photocoupler U1, wherein a first pin of the photocoupler U1 is connected to the other end of the resistor R3, a second pin is connected to the drain of the field effect transistor Q3, a third pin is respectively connected to the other end of the capacitor C2, an input end of the first relay control module (3), an input end of the second relay control module (4) and an input end of the third relay control module (5), and a fourth pin is connected to the other end of the resistor R3; The second pin of the bidirectional TVS tube D14 serves as the first input end of the first signal output module (1), one end of the resistor R2 and one end of the resistor R3 serve as the second input end of the first signal output module (1), and the third pin of the photoelectric coupler U1 serves as the output end of the first signal output module (1).

3. The signal and charging switching control circuit according to claim 1, characterized in that: The second signal output module (2) comprises: A bidirectional TVS tube D15, wherein the second pin of the bidirectional TVS tube D15 is connected to the fifth pin of the signal relay K2; a diode D10, wherein the anode of the diode D10 is connected to the second pin of the bidirectional TVS tube D15; a resistor R19, one end of the resistor R19 being connected to the cathode of the diode D10; a resistor R23, one end of the resistor R23 being connected to the first pin of the bidirectional TVS diode D15, and the other end of the resistor R23 being connected to the other end of the resistor R19; a resistor R20, one end of the resistor R20 being connected to the other end of the resistor R19, and the other end of the resistor R20 being connected to the gate of the field effect transistor Q8; a capacitor C8, one end of the capacitor C8 being connected to the other end of the resistor R20, and the other end of the capacitor C8 being connected to one end of the resistor R23; a capacitor C9, one end of the capacitor C9 being connected to the other end of the resistor R20, and the other end of the capacitor C9 being connected to the other end of the capacitor C8 and the source of the field effect transistor Q8; a capacitor C6, one end of the capacitor C6 being connected to the source of the field effect transistor Q8 and grounded; a resistor R17, one end of the resistor R17 being connected to the output end of the voltage conversion module (6); a resistor R16, one end of the resistor R16 being connected to the output end of the voltage conversion module (6); A photoelectric coupler U2, wherein the first pin of the photoelectric coupler U2 is connected to the other end of the resistor R17, the second pin is connected to the drain of the field effect transistor Q8, the third pin is respectively connected to the other end of the capacitor C6, the input end of the first relay control module (3), the input end of the second relay control module (4) and the input end of the third relay control module (5), and the fourth pin is connected to the other end of the resistor R16; The second pin of the bidirectional TVS tube D15 serves as the first input end of the second signal output module (2), one end of the resistor R16 and one end of the resistor R17 serve as the second input end of the second signal output module (2), and the third pin of the photoelectric coupler U2 serves as the output end of the second signal output module (2).

4. The signal and charging switching control circuit according to claim 1, characterized in that: The first relay control module (3) comprises: a diode D2, wherein the anode of the diode D2 is connected to the output end of the first signal output module (1); a resistor R1, one end of the resistor R1 being connected to the cathode of the diode D2, and the other end of the resistor R1 being connected to the drain of the field effect transistor Q2; a diode D3, wherein the anode of the diode D3 is connected to the output end of the second signal output module (2); a resistor R4, one end of the resistor R4 being connected to the cathode of the diode D3, and the other end of the resistor R4 being connected to the gate of the field effect transistor Q2; a resistor R8, one end of the resistor R8 being connected to the other end of the resistor R4, and the other end of the resistor R8 being connected to the source of the field effect transistor Q2 and grounded; a resistor R5, one end of the resistor R5 being connected to the drain of the field effect transistor Q2, and the other end of the resistor R5 being connected to the source of the field effect transistor Q2; a capacitor C1, one end of the capacitor C1 being connected to one end of the resistor R5, and the other end of the capacitor C1 being connected to the other end of the resistor R5; a field effect transistor Q1 , wherein the gate of the field effect transistor Q1 is connected to one end of the capacitor C1 , the source is connected to the other end of the capacitor C1 , and the drain is connected to the second pin of the power relay K1 ; The anode of the diode D2 and the anode of the diode D3 serve as input terminals of the first relay control module (3), and the drain of the field effect transistor Q1 serves as an output terminal of the first relay control module (3).

5. The signal and charging switching control circuit according to claim 1, characterized in that: The second relay control module (4) comprises: a diode D6, wherein the anode of the diode D6 is connected to the output end of the second signal output module (2); a resistor R12, one end of the resistor R12 being connected to the cathode of the diode D6, and the other end of the resistor R12 being connected to the drain of the field effect transistor Q5; a diode D7, wherein the anode of the diode D7 is connected to the output end of the first signal output module (1); a resistor R13, one end of the resistor R13 being connected to the cathode of the diode D7, and the other end of the resistor R13 being connected to the gate of the field effect transistor Q5; a resistor R15, one end of the resistor R15 being connected to the other end of the resistor R13, and the other end of the resistor R15 being connected to the source of the field effect transistor Q5 and grounded; a resistor R14, one end of the resistor R14 being connected to the drain of the field effect transistor Q5, and the other end of the resistor R14 being connected to the source of the field effect transistor Q5; a capacitor C5, one end of the capacitor C5 being connected to one end of the resistor R14, and the other end of the capacitor C5 being connected to the other end of the resistor R14; a field effect transistor Q4 , wherein the gate of the field effect transistor Q4 is connected to one end of the capacitor C5 , the source is connected to the other end of the capacitor C5 , and the drain is connected to the twelfth pin of the signal relay K2 ; The anode of the diode D6 and the anode of the diode D7 serve as the input end of the second relay control module (4), and the drain of the field effect transistor Q4 serves as the output end of the second relay control module (4).

6. The signal and charging switching control circuit according to claim 1, characterized in that: The third relay control module (5) comprises: a diode D9, wherein the anode of the diode D9 is connected to the output end of the second signal output module (2); a resistor R18, one end of the resistor R18 being connected to the cathode of the diode D9, and the other end of the resistor R18 being connected to the drain of the field effect transistor Q7; a diode D11, wherein the anode of the diode D11 is connected to the output end of the first signal output module (1); a resistor R21, one end of the resistor R21 being connected to the cathode of the diode D11, and the other end of the resistor R21 being connected to the gate of the field effect transistor Q7; a resistor R24, one end of the resistor R24 ​​being connected to the other end of the resistor R21, and the other end of the resistor R24 ​​being connected to the source of the field effect transistor Q7 and grounded; a resistor R22, one end of the resistor R22 being connected to the drain of the field effect transistor Q7, and the other end of the resistor R22 being connected to the source of the field effect transistor Q7; a capacitor C7, one end of the capacitor C7 being connected to one end of the resistor R22, and the other end of the capacitor C7 being connected to the other end of the resistor R22; a field effect transistor Q6 , wherein the gate of the field effect transistor Q6 is connected to one end of the capacitor C7 , the source is connected to the other end of the capacitor C7 , and the drain is connected to the second pin of the power relay K3 ; The anode of the diode D9 and the anode of the diode D11 serve as input terminals of the third relay control module (5), and the drain of the field effect transistor Q6 serves as the output terminal of the third relay control module (5).

7. The signal and charging switching control circuit according to claim 1, characterized in that: A Schottky diode D1 is connected between the first pin and the second pin of the power relay K1 , the anode of the Schottky diode D1 is connected to the second pin of the power relay K1 , and the cathode of the Schottky diode D1 is connected to the first pin of the power relay K1 .

8. The signal and charging switching control circuit according to claim 1, characterized in that: A Schottky diode D5 is connected between the first pin and the twelfth pin of the signal relay K2 , the anode of the Schottky diode D5 is connected to the twelfth pin of the signal relay K2 , and the cathode of the Schottky diode D5 is connected to the first pin of the signal relay K2 .

9. The signal and charging switching control circuit according to claim 1, characterized in that: A Schottky diode D8 is connected between the first pin and the second pin of the power relay K3 , the anode of the Schottky diode D8 is connected to the second pin of the power relay K3 , and the cathode of the Schottky diode D8 is connected to the first pin of the power relay K3 .

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