Relay on-off control circuit

Abstract

The utility model provides a relay on-off control circuit, which comprises a relay, a redundancy on-off control module, a power supply control module and an on-off signal feedback module, and is characterized in that the first input end of the redundancy on-off control module is connected to a first on-off control signal, the second input end of the redundancy on-off control module is connected to a second on-off control signal, and the power supply control module is connected to the on-off signal feedback module. The output end of the redundant on-off control module is connected to a power supply cathode pin of the relay, and the redundant on-off control module is also connected to a grounding end; the input end of the power supply control module is connected to a power supply input control signal, the output end of the power supply control module is connected to a power supply anode pin of the relay, and the power supply end of the power supply control module is connected to a first power supply; and the on-off signal feedback module is connected to an on-off feedback pin of the relay. According to the invention, the on-off control of the relay is realized through the redundancy on-off control module, and the operation reliability of the relay is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay on-off control, and particularly relates to a relay on-off control circuit. BACKGROUND

[0002] The prior art generally realizes the on-off control of the relay through a single control signal, but in some cases, there is a strict control requirement for the power-on control of the relay, and such a control mode lacks reliability for the relay. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to at least provide a relay on-off control circuit, which realizes the on-off control of the relay through a redundant on-off control module, and improves the reliability of the relay operation.

[0004] The present application mainly includes the following aspects:

[0005] In a preferred embodiment, the first on-off control signal is provided by a first control chip, the second on-off control signal is provided by a second control chip, and the power input control signal is provided by the first control chip or the second control chip; the input end of the on-off signal feedback module is connected to the on-off feedback pin of the relay, and the output end of the on-off signal feedback module is connected to the first control chip and the second control chip respectively.

[0006] In a preferred embodiment, the first on-off control signal is provided by a first control chip, the second on-off control signal is provided by a second control chip, and the power input control signal is provided by the first control chip or the second control chip; the input end of the on-off signal feedback module is connected to the on-off feedback pin of the relay, and the output end of the on-off signal feedback module is connected to the first control chip and the second control chip respectively.

[0007] In a possible implementation, the redundant on-off control module comprises a first on-off control unit, a second on-off control unit and a third on-off control unit, wherein an input end of the first on-off control unit is connected to the first on-off control signal, a power supply end of the first on-off control unit is connected to the first power supply, and a ground end of the first on-off control unit is connected to the power supply ground; an input end of the second on-off control unit is connected to the second on-off control signal, a power supply end of the second on-off control unit is connected to the first power supply, and a ground end of the second on-off control unit is connected to the power supply ground; an output end of the first on-off control unit is connected to an output end of the second on-off control unit, and then connected to an input end of the third on-off control unit, an output end of the third on-off control unit is connected to the power supply negative pin of the relay, a power supply end of the third on-off control unit is connected to the first power supply, and a ground end of the third on-off control unit is connected to the power supply ground.

[0008] In a possible implementation, the first on-off control unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first diode and a first triode, wherein one end of the first resistor is connected to the first on-off control signal, a cathode of the first diode, one end of the second resistor, one end of the third resistor and one end of the fourth resistor respectively, and the other end of the first resistor is connected to the first input power supply; the other end of the second resistor is connected to the first power supply and one end of the first capacitor respectively, the other end of the first capacitor is connected to the power supply ground; the other end of the third resistor is connected to a base of the first triode, an emitter of the first triode is connected to an anode of the first diode, the other end of the fourth resistor and the power supply ground respectively, and a collector of the first triode is connected to an output end of the second on-off control unit and then connected to an input end of the third on-off control unit.

[0009] In a possible implementation, the second on-off control unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a second diode and a second triode, wherein one end of the fifth resistor is connected to the second on-off control signal, a cathode of the second diode, one end of the sixth resistor, one end of the seventh resistor and one end of the eighth resistor respectively, and the other end of the fifth resistor is connected to the first input power supply; the other end of the sixth resistor is connected to the first power supply and one end of the second capacitor respectively, the other end of the second capacitor is connected to the power supply ground; the other end of the seventh resistor is connected to a base of the second triode, an emitter of the second triode is connected to an anode of the second diode, the other end of the eighth resistor and the power supply ground respectively, and a collector of the second triode is connected to a collector of the first triode in the first on-off control unit and then connected to an input end of the third on-off control unit.

[0010] In a possible implementation, the third on-off control unit includes a ninth resistor, a tenth resistor, an eleventh resistor, a first field effect switch, and a third capacitor, wherein one end of the ninth resistor is connected to the collector of the first triode in the first on-off control unit, the collector of the second triode in the second on-off control unit, and one end of the tenth resistor respectively, the other end of the ninth resistor is connected to one end of the third capacitor and the first power supply respectively, the other end of the third capacitor is connected to the power ground; the other end of the tenth resistor is connected to one end of the eleventh resistor and the gate of the first field effect switch respectively, the drain of the first field effect switch is connected to the power negative pin of the relay, and the source of the first field effect switch is connected to the power ground and the other end of the eleventh resistor respectively.

[0011] In a possible implementation, the power supply control module includes a relay power-on control unit, a following unit, a comparison unit, a loss reduction output unit, and a loss reduction power supply unit, and a controlled switch is formed between the power access pin and the on-off feedback pin of the relay, wherein the first input end of the relay power-on control unit is connected to the power input control signal, the first power supply end of the relay power-on control unit is connected to the first power supply, and the output end of the relay power-on control unit is connected to the power positive pin of the relay; the power access pin of the relay is connected to the first power supply, the on-off feedback pin of the relay is connected to the input end of the following unit, the output end of the following unit is connected to the input end of the comparison unit, the output end of the comparison unit is connected to the input end of the loss reduction output unit, and the output end of the loss reduction output unit is connected to the second input end of the relay power-on control unit; the input end of the loss reduction power supply unit is connected to the second power supply, and the output end of the loss reduction power supply unit is connected to the second power supply end of the relay power-on control unit, and the second power supply is lower than the first power supply.

[0012] In a possible implementation, the relay power-on control unit includes a third diode, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third triode, a second field effect switch, a fourth capacitor, a fifth capacitor, and a sixth capacitor, wherein the cathode of the third diode is connected to the power input control signal and one end of the twelfth resistor respectively, and the anode of the third diode is connected to the power ground; the other end of the twelfth resistor is connected to one end of the thirteenth resistor and the base of the third triode respectively, the emitter of the third triode is connected to the other end of the thirteenth resistor and then connected to the power ground, and the collector of the third triode is connected to one end of the fourteenth resistor; the other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the gate of the second field effect switch respectively, the source of the second field effect switch is connected to the other end of the fifteenth resistor, the first power supply, one end of the fourth capacitor, one end of the fifth capacitor, and one end of the sixth capacitor respectively, and the drain of the second field effect switch is connected to the power positive pin of the relay and the output end of the loss reduction power supply unit respectively.

[0013] In a possible implementation, the redundant on-off control module further comprises a relay loss reduction control unit and a loss reduction power supply module, a controlled switch is formed between a power access pin and an on-off feedback pin of the relay, wherein the power access pin of the relay is connected to the first power supply, the on-off feedback pin of the relay is connected to an input end of the relay loss reduction control unit, and an output end of the relay loss reduction control unit is connected to a gate of the second field effect switch in the relay power-on control unit; an input end of the loss reduction power supply module is connected to a second power supply, and an output end of the loss reduction power supply module is connected to a drain of the second field effect switch in the relay power-on control unit, and the second power supply is lower than the first power supply.

[0014] In a possible implementation, the loss reduction power supply module comprises a fourth diode, a seventh capacitor, an eighth capacitor and a ninth capacitor, wherein a cathode of the fourth diode is connected to a drain of the second field effect switch in the relay power-on control unit, an anode of the fourth diode is respectively connected to the second power supply, one end of the seventh capacitor, one end of the eighth capacitor and one end of the ninth capacitor; the other end of the seventh capacitor, the other end of the eighth capacitor and the other end of the ninth capacitor are all connected to a power supply ground.

[0015] In a possible implementation, the following unit comprises a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a first operational amplifier, wherein one end of the sixteenth resistor is connected to the on-off feedback pin, the other end of the sixteenth resistor is respectively connected to one end of the seventeenth resistor and a positive signal input end of the first operational amplifier, a negative signal input end of the first operational amplifier is connected to an output end of the first operational amplifier and one end of the eighteenth resistor; a positive power supply input end of the first operational amplifier is respectively connected to the second input power supply, one end of the tenth capacitor and one end of the eleventh capacitor, the other end of the tenth capacitor and the other end of the eleventh capacitor are connected and then connected to a power supply ground, and a negative power supply input end of the first operational amplifier is connected to the other end of the seventeenth resistor and then connected to the power supply ground; the other end of the eighteenth resistor is respectively connected to one end of the twelfth capacitor and one end of the nineteenth resistor, the other end of the twelfth capacitor is connected to the power supply ground, and the other end of the nineteenth resistor is connected to an input end of the comparison unit.

[0016] In a possible implementation, the comparison unit comprises a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a fifth diode, and a second operational amplifier, wherein one end of the twentieth resistor is connected to the other end of the nineteenth resistor in the following unit and the negative signal input end of the second operational amplifier, respectively, and the other end of the twentieth resistor is connected to the output end of the second operational amplifier; the positive signal input end of the second operational amplifier is connected to one end of the twenty-second resistor and one end of the twenty-first resistor, respectively, the other end of the twenty-second resistor is connected to the power supply ground, and the other end of the twenty-first resistor is connected to the first power supply; the negative power supply input end of the second operational amplifier is connected to the power supply ground, the positive power supply input end of the second operational amplifier is connected to the second input power supply, one end of the thirteenth capacitor, and one end of the fourteenth capacitor, respectively, the other end of the thirteenth capacitor and the other end of the fourteenth capacitor are connected to the power supply ground after being connected; the output end of the second operational amplifier is also connected to one end of the twenty-third resistor and one end of the twenty-fourth resistor, respectively, the other end of the twenty-third resistor is connected to the second input power supply and one end of the twenty-fifth resistor, respectively, the other end of the twenty-fourth resistor is connected to one end of the fifteenth capacitor and the cathode of the fifth diode, respectively, the other end of the fifteenth capacitor is connected to the power supply ground, and the anode of the fifth diode is connected to the other end of the twenty-fifth resistor and the input end of the loss output unit, respectively.

[0017] And / or, the loss output unit comprises a sixth diode, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a seventh diode, and a fourth triode, wherein the anode of the sixth diode is connected to the other end of the twenty-fifth resistor in the comparison unit, the cathode of the sixth diode is connected to one end of the twenty-sixth resistor, the other end of the twenty-sixth resistor is connected to one end of the twenty-seventh resistor and the base of the fourth triode, respectively, the emitter of the fourth triode is connected to the other end of the twenty-seventh resistor and then connected to the power supply ground, the collector of the fourth triode is connected to one end of the twenty-eighth resistor and the anode of the seventh diode, respectively, the other end of the twenty-eighth resistor is connected to the first power supply, and the cathode of the seventh diode is connected to the gate of the second field effect switch in the relay power-on control unit.

[0018] The relay on-off control circuit provided by the embodiment of the application comprises a relay, a redundant on-off control module and a power supply control module, wherein the first input end of the redundant on-off control module is connected to the first on-off control signal, the second input end of the redundant on-off control module is connected to the second on-off control signal, and the output end of the redundant on-off control module is connected to the power negative pole pin of the relay; the input end of the power supply control module is connected to the power supply input control signal, the output end of the power supply control module is connected to the power positive pole pin of the relay, and the power supply end of the power supply control module is connected to the first power supply. The on-off control of the relay is realized through the redundant on-off control module, and the reliability of the relay operation is improved.

[0019] In order to make the above objectives, features and advantages of the application more apparent, the following will specifically describe a preferred embodiment in conjunction with the accompanying drawings, and make a detailed description as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without paying creative labor on the basis of these drawings.

[0021] Figure 1 Fig. 1 shows a structure schematic diagram of a relay on-off control circuit provided by the embodiment of the application;

[0022] Figure 2 Fig. 2 shows a structure schematic diagram of a redundant on-off control module provided by the embodiment of the application;

[0023] Figure 3 Fig. 3 shows another structure schematic diagram of a redundant on-off control module provided by the embodiment of the application;

[0024] Figure 4 Fig. 4 shows a structure schematic diagram of a power supply control module provided by the embodiment of the application;

[0025] Figure 5 Fig. 5 shows another structure schematic diagram of a power supply control module provided by the embodiment of the application;

[0026] Figure 6 Fig. 6 shows a structure schematic diagram of a relay loss reduction control unit provided by the embodiment of the application. DETAILED DESCRIPTION

[0027] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of description and illustration, and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowchart shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowchart or one or more operations can be removed from the flowchart under the guidance of the content of the present application.

[0028] In addition, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] The prior art generally only realizes the on-off control of the relay through a single control signal, but such a control mode lacks reliability for the power-on operation of the relay, and the current for maintaining the operation of the relay after the relay is attracted is generally less than the current required for starting the relay. Using the starting voltage corresponding to the relay to maintain the attracted state of the relay after the relay is attracted causes unnecessary power loss, further causes resource waste, and increases the operation cost of the relay.

[0030] Based on this, the embodiments of the present application provide a relay on-off control circuit, which realizes the on-off control of the relay through a redundant on-off control module, improves the reliability of the operation of the relay, and specifically as follows:

[0031] Please refer to Figure 1 , Figure 1 FIG. 1 shows a structure schematic diagram of a relay on-off control circuit provided by an embodiment of the present application. As shown in FIG. 1, the relay on-off control circuit comprises a relay 1, a first on-off control module 2, a second on-off control module 3, a first voltage regulator 4, a second voltage regulator 5, a first voltage sensor 6, a second voltage sensor 7, a first current sensor 8, a second current sensor 9, a first voltage comparator 10, a second voltage comparator 11, a first current comparator 12, a second current comparator 13, a first switch 14, a second switch 15, a third switch 16, a fourth switch 17, a first voltage regulator control module 18, a second voltage regulator control module 19, a first on-off control module control module 20, a second on-off control module control module 21, a first voltage sensor control module 22, a second voltage sensor control module 23, a first current sensor control module 24, a second current sensor control module 25, a first voltage comparator control module 26, a second voltage comparator control module 27, a first current comparator control module 28, and a second current comparator control module 29. Figure 1As shown, the relay on / off control circuit provided in this application embodiment includes a relay 1, a redundant on / off control module 2, and a power supply control module 3. A coil is formed between the positive power supply pin REALAY+ and the negative power supply pin REALAY- of the relay 1. The first input terminal of the redundant on / off control module 2 is connected to the first on / off control signal DRIVE1, the second input terminal of the redundant on / off control module 2 is connected to the second on / off control signal DRIVE2, the output terminal of the redundant on / off control module 2 is connected to the negative power supply pin REALAY- of the relay, and the redundant on / off control module 2 is also connected to the ground terminal AGND.

[0032] The input terminal of the power supply control module 3 is connected to the power supply input control signal SWITCH, the output terminal of the power supply control module 3 is connected to the positive power supply pin REALAY+ of the relay 1, and the power supply terminal of the power supply control module 3 is connected to the first power supply +12V_A.

[0033] In this application, the power supply control module 3 provides operating power to the relay 1, and the redundant on / off control module 2 realizes redundant on / off control of the relay 1 through the first on / off control signal and the second on / off signal. Specifically, the first on / off control signal and the second on / off signal redundantly realize the on / off control between the power supply negative pin REALAY- and the ground terminal AGND of the relay 1. The relay 1 provided in this application closes when the power supply negative pin REALAY- and the ground terminal AGND are connected under the control of the first on / off control signal and the second on / off signal.

[0034] In a preferred embodiment, the first on / off control signal DRIVE1 is provided by a first control chip (not shown in the figure), the second on / off control signal DRIVE2 is provided by a second control chip (not shown in the figure), and the power supply input control signal SWITCH is provided by either the first or the second control chip.

[0035] Specifically, the first on / off control signal DRIVE1 and the second on / off control signal DRIVE2 belong to different control chips. If either the first on / off control signal DRIVE1 or the second on / off control signal DRIVE2 malfunctions, relay 1 cannot be directly closed.

[0036] The first power supply, +12V_A, outputs +12V voltage.

[0037] In a preferred embodiment, please refer to Figure 2 , Figure 2 This illustration shows one of the structural schematic diagrams of a redundant on / off control module provided in an embodiment of this application. Figure 2 As shown, the redundant on / off control module 2 includes a first on / off control unit 21, a second on / off control unit 22, and a third on / off control unit 23.

[0038] The input terminal of the first on / off control unit 21 is connected to the first on / off control signal DRIVE1, the power supply terminal of the first on / off control unit 21 is connected to the first power supply +12V_A, and the ground terminal of the first on / off control unit 21 is connected to the power ground AGND.

[0039] The input terminal of the second on / off control unit 22 is connected to the second on / off control signal DRIVE2, the power supply terminal of the second on / off control unit 22 is connected to the first power supply +12V_A, and the ground terminal of the second on / off control unit 22 is connected to the power ground AGND.

[0040] The output terminal of the first on / off control unit 21 is connected to the output terminal of the second on / off control unit 22 and then connected to the input terminal of the third on / off control unit 23. The output terminal of the third on / off control unit 23 is connected to the negative power supply pin REALAY- of the relay. The power supply terminal of the third on / off control unit 23 is connected to the first power supply +12V_A. The ground terminal of the third on / off control unit 23 is connected to the power ground AGND.

[0041] In a preferred embodiment, please refer to Figure 3 , Figure 3 This is a second schematic diagram of the structure of a redundant on / off control module provided in an embodiment of this application. For example... Figure 3 As shown, the first on / off control unit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first diode D1, and a first transistor T1. The first transistor T1 is an NPN transistor, and the first diode D1 is a Zener diode.

[0042] One end of the first resistor R1 is connected to the first on / off control signal DRIVE1, the cathode of the first diode D1, one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4, and the other end of the first resistor R1 is connected to the first input power supply 3.3V_A.

[0043] The first input power supply 3.3V_A provides 3.3V power.

[0044] The other end of the second resistor R2 is connected to the first power supply +12V_A and one end of the first capacitor C1, respectively. The other end of the first capacitor C1 is connected to the power ground AGND.

[0045] The other end of the third resistor R3 is connected to the base of the first transistor T1. The emitter of the first transistor T1 is connected to the anode of the first diode D1, the other end of the fourth resistor R4, and the power ground AGND. The collector of the first transistor T1 is connected to the output terminal of the second on / off control unit 22 and then connected to the input terminal of the third on / off control unit 23.

[0046] In a preferred embodiment, as shown in Figure 3 , the second on-off control unit 22 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a second diode D2 and a second triode T2, the second triode T2 is an NPN triode, and the second triode T2 is a zener diode.

[0047] Wherein one end of the fifth resistor R5 is connected to the second on-off control signal DRIVE2, the cathode of the second diode D2, one end of the sixth resistor R6, one end of the seventh resistor R7 and one end of the eighth resistor R8 respectively, and the other end of the fifth resistor R5 is connected to the first input power supply 3.3V_A.

[0048] The other end of the sixth resistor R6 is connected to the first power supply +12V_A and one end of the second capacitor C2 respectively, and the other end of the second capacitor C2 is connected to the power ground AGND.

[0049] The other end of the seventh resistor R7 is connected to the base of the second triode T2, the emitter of the second triode T2 is connected to the anode of the second diode D2, the other end of the eighth resistor R8 and the power ground AGND respectively, and the collector of the second triode T2 is connected to the collector of the first triode T1 in the first on-off control unit 21 and then connected to the input end of the third on-off control unit 23.

[0050] In a preferred embodiment, as shown in Figure 3 , the third on-off control unit 23 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first field effect switch Q1 and a third capacitor C3, and the first field effect switch Q1 is an NMOS field effect switch.

[0051] Wherein one end of the ninth resistor R9 is connected to the collector of the first triode T1 in the first on-off control unit 21, the collector of the second triode T2 in the second on-off control unit 22 and one end of the tenth resistor R10 respectively, and the other end of the ninth resistor R9 is connected to one end of the third capacitor C3 and the first power supply +12V_A respectively, and the other end of the third capacitor C3 is connected to the power ground AGND.

[0052] The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the gate of the first field effect switch Q1 respectively, the drain of the first field effect switch Q1 is connected to the power negative pin RELAY- of the relay, and the source of the first field effect switch Q1 is connected to the power ground AGND and the other end of the eleventh resistor R11 respectively.

[0053] Please refer to Figure 4 , Figure 4A structure diagram of a power supply control module is shown in the embodiment of the present application. As shown in Figure 4 and Figure 1 The power supply control module 3 includes a relay power-on control unit 31, a relay loss reduction control unit 32 and a loss reduction power supply unit 33, and a power supply access pin P1 of the relay 1 and a on-off feedback pin FB_RY form a controlled switch.

[0054] The first input end of the relay power-on control unit 31 is connected to a power supply input control signal SWITCH, the first power supply end of the relay power-on control unit 31 is connected to a first power supply +12V_A, and the output end of the relay power-on control unit 31 is connected to a power supply positive pin RELAY+ of the relay 1.

[0055] The power supply access pin P1 of the relay 1 is connected to the first power supply +12V_A, the on-off feedback pin FB_RY of the relay 1 is connected to the input end of the relay loss reduction control unit 32, and the output end of the relay loss reduction control unit 32 is connected to the second input end of the relay power-on control unit 31.

[0056] The input end of the loss reduction power supply module 33 is connected to a second power supply +8V_A, the output end of the loss reduction power supply module 33 is connected to the second power supply end of the relay power-on control unit, the second power supply +8V_A is lower than the first power supply +12V_A, and the second power supply +8V_A provides a +8V voltage.

[0057] In a preferred embodiment, please refer to Figure 5 , Figure 5 A structure diagram of a power supply control module is shown in the embodiment of the present application. As shown in Figure 5 The relay power-on control unit 31 includes a third diode D3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a third triode T3, a second field effect switch Q2, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6, wherein the third triode T3 is a PNP triode, the second field effect switch Q2 is a PMOS field effect switch (gate low level on), the sixth capacitor C6 is an electrolytic capacitor, and the third diode D3 is a voltage stabilizing diode.

[0058] Preferably, the cathode of the third diode D3 is connected to the power supply input control signal SWITCH and one end of the twelfth resistor R12 respectively, and the anode of the third diode D3 is connected to a power supply ground AGND.

[0059] The other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13 and the base of the thirteenth transistor T3, respectively, the emitter of the thirteenth transistor T3 is connected to the other end of the thirteenth resistor R13 and then connected to the power supply ground AGND, and the collector of the thirteenth transistor T3 is connected to one end of the fourteenth resistor R14.

[0060] The other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and the gate of the second field effect switch Q2, respectively, the source of the second field effect switch Q2 is connected to the other end of the fifteenth resistor R15, the first power supply +12V_A, one end of the fourth capacitor C4, one end of the fifth capacitor C5 and one end of the sixth capacitor C6, respectively, and the drain of the second field effect switch Q2 is connected to the power supply positive pin RELAY+ of the relay and the output end of the loss reduction power supply unit 33.

[0061] In a preferred embodiment, as shown in Figure 5 , the loss reduction power supply unit includes a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9, and the ninth capacitor C9 is an electrolytic capacitor.

[0062] Among them, the cathode of the fourth diode D4 is connected to the drain of the second field effect switch Q2 in the relay power-on control unit 31, and the anode of the fourth diode D4 is connected to the second power supply +8V_A, one end of the seventh capacitor C7, one end of the eighth capacitor C8 and one end of the ninth capacitor C9, respectively.

[0063] The other end of the seventh capacitor C7, the other end of the eighth capacitor C8 and the other end of the ninth capacitor C9 are all connected to the power supply ground AGND.

[0064] In a preferred embodiment, as shown in Figure 5 , the relay loss reduction control unit 32 includes a follow-up unit 320, a comparison unit 321 and a loss reduction output unit 322.

[0065] Preferably, the input end of the follow-up unit 320 is connected to the on-off feedback pin FB_RY, the output end of the follow-up unit 320 is connected to the input end of the comparison unit 321, the output end of the comparison unit 321 is connected to the input end of the loss reduction output unit 322, and the output end of the loss reduction output unit 322 is connected to the gate of the second field effect switch Q2 in the relay power-on control unit 31.

[0066] In a preferred embodiment, please refer to Figure 6 , Figure 6 Figure 1 shows a structure diagram of a relay loss reduction control unit provided by an embodiment of the present application. As shown in Figure 6As shown, the following unit 320 includes the sixteenth resistance R16, the seventeenth resistance R17, the eighteenth resistance R18, the nineteenth resistance R19, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the first operational amplifier U1A.

[0067] Preferably, one end of the sixteenth resistance R16 is connected to the on-off feedback pin FB_RY, and the other end of the sixteenth resistance R16 is connected to the other end of the seventeenth resistance R17 and the positive signal input end of the first operational amplifier U1A, respectively, and the negative signal input end of the first operational amplifier U1A is connected to the output end of the first operational amplifier U1A and one end of the eighteenth resistance R18.

[0068] The positive power input end of the first operational amplifier U1A is connected to the second input power supply +5V_A, one end of the tenth capacitor C10 and one end of the eleventh capacitor C11, respectively, and the other end of the tenth capacitor C10 and the other end of the eleventh capacitor C11 are connected and then connected to the power ground AGND, and the negative power input end of the first operational amplifier U1A is connected to the other end of the seventeenth resistance R17 and then connected to the power ground AGND.

[0069] The other end of the eighteenth resistance R18 is connected to one end of the twelfth capacitor C12 and one end of the nineteenth resistance C19, respectively, the other end of the twelfth capacitor C12 is connected to the power ground AGND, and the other end of the nineteenth resistance is connected to the input end of the comparison unit.

[0070] In this application, the eighteenth resistance R18 and the twelfth capacitor C12 form a delay unit for adjusting the delay time of the power supply switching after the relay is closed, and the user can change the delay time by changing the capacitance of the twelfth capacitor C12. Specifically, the larger the capacitance of the twelfth capacitor C12, the longer the delay time, and the delay unit can also be other delay elements that can achieve the delay effect as in this application, which is not specifically limited here.

[0071] In a preferred embodiment, as shown in Figure 6 The comparison unit includes the twentieth resistance R20, the twenty-first resistance R21, the twenty-second resistance R22, the twenty-third resistance R23, the twenty-fourth resistance R24, the twenty-fifth resistance R25, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15, the fifth diode D5 and the second operational amplifier U2A.

[0072] Among them, one end of the twentieth resistance R20 is connected to the other end of the nineteenth resistance R19 and the negative signal input end of the second operational amplifier U2A, respectively, and the other end of the twentieth resistance R20 is connected to the output end of the second operational amplifier U2A.

[0073] The positive signal input terminal of the second operational amplifier U2A is connected to one end of the twenty-second resistor R22 and one end of the twenty-first resistor R21 respectively, the other end of the twenty-second resistor R22 is connected to the power ground AGND, and the other end of the twenty-first resistor R21 is connected to the first power supply +12V_A.

[0074] The negative power input terminal of the second operational amplifier U2A is connected to the power ground AGND, and the positive power input terminal of the second operational amplifier U2A is connected to the second input power supply +5V_A, one end of the thirteenth capacitor C13 and one end of the fourteenth capacitor C14 respectively, and the other end of the thirteenth capacitor C13 and the other end of the fourteenth capacitor C14 are connected and then connected to the power ground AGND, and the second input power supply +5V_A provides a +5V voltage.

[0075] The output terminal of the second operational amplifier U2A is also connected to one end of the twenty-third resistor R23 and one end of the twenty-fourth resistor R24 respectively, the other end of the twenty-third resistor R23 is connected to the second input power supply +5V_A and one end of the twenty-fifth resistor R25 respectively, the other end of the twenty-fourth resistor R24 is connected to one end of the fifteenth capacitor C15 and the cathode of the fifth diode D5 respectively, the other end of the fifteenth capacitor C15 is connected to the power ground AGND, and the anode of the fifth diode D5 is connected to the other end of the twenty-fifth resistor R25 and the input terminal of the loss reduction output unit respectively.

[0076] In a preferred embodiment, as Figure 6 , the loss reduction output unit includes a sixth diode D6, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a seventh diode D7, and a fourth triode T4, which is an NPN triode.

[0077] Among them, the anode of the sixth diode D6 is connected to the other end of the twenty-fifth resistor R25, the cathode of the sixth diode D6 is connected to one end of the twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is connected to one end of the twenty-seventh resistor R27 and the base of the fourth triode T4 respectively, the emitter of the fourth triode T4 is connected to the other end of the twenty-seventh resistor R27 and then connected to the power ground AGND, the collector of the fourth triode T4 is connected to one end of the twenty-eighth resistor R28 and the anode of the seventh diode D7 respectively, the other end of the twenty-eighth resistor R28 is connected to the first power supply +12V_A, and the cathode of the seventh diode D7 is connected to the gate of the second field effect switch Q2.

[0078] In a preferred embodiment, as Figure 1As shown, the relay on-off control circuit further comprises an on-off signal feedback module 4, an input end of the on-off signal feedback module 4 is connected to the on-off feedback pin FB_RY of the relay 1, and output ends of the on-off signal feedback module 4 are respectively connected to the first control chip 5 and the second control chip 6.

[0079] In a preferred embodiment, the on-off signal feedback module 4 comprises a twenty-ninth resistor R29 and a thirtieth resistor R30, wherein one end of the twenty-ninth resistor R29 is connected to the on-off feedback pin FB_RY, the other end of the twenty-ninth resistor R29 is respectively connected to the first control chip 5, the second control chip 6 and one end of the thirtieth resistor R30, and the other end of the thirtieth resistor R30 is connected to the power supply ground AGND.

[0080] In a preferred embodiment, as shown, Figure 1 the relay on-off control circuit further comprises a thirty-first resistor R31 and an eighth diode D8, wherein an anode of the eighth diode D8 is connected to the power supply negative pin RELAY- of the relay, a cathode of the eighth diode D8 is connected to one end of the thirty-first resistor R31, and the other end of the thirty-first resistor R31 is connected to the power supply positive pin RELAY+ of the relay.

[0081] Specifically, when the relay is closed, the power supply positive pin RELAY+ of the relay and the power supply negative pin RELAY- of the relay are conducted, an induced electromotive force is generated between the power supply positive pin RELAY+ and the power supply negative pin RELAY- of the relay, the direction of the induced electromotive force is opposite to the direction of the voltage between the two ends of the coil, if the relay is opened, the voltage between the two ends of the coil is zero, but the induced electromotive force generated by the coil is still present, and the induced electromotive force is opposite to the voltage when the power supply positive pin RELAY+ and the power supply negative pin RELAY- are conducted, therefore, if no treatment is performed, the induced electromotive force may damage the circuit elements, based on this, the thirty-first resistor R31 and the eighth diode D8 are connected in series between the power supply positive pin RELAY+ and the power supply negative pin RELAY- of the relay, a freewheeling circuit is formed by the thirty-first resistor R31 and the eighth diode D8, and the induced electromotive force generated by the coil when the relay is opened can be freewheeled, thereby preventing damage to the circuit.

[0082] In the present application, as shown, Figure 1 the relay 1 further comprises a first contact pin P2 and a second release pin P3, a switch is formed between the first contact pin P2 and the second release pin P3, the on-off between the first contact pin P2 and the second release pin P3 is determined by the conduction between the power supply positive pin RELAY+ and the power supply negative pin RELAY- of the relay, and the first contact pin P2 and the second release pin P3 are connected to a target loop, so as to realize on-off control of the target loop through the relay.

[0083] Specifically, the relay on / off control circuit provided in this application operates as follows:

[0084] The relay closing process is as follows:

[0085] like Figure 3 In the redundant on / off control module shown, the first on / off control signal DRIVE1 and the second on / off control signal DRIVE2 are set to low level signals by the first control chip and the second control chip, respectively. At this time, the first transistor T1 and the second transistor T2 are in the off state. The first power supply +12V_A outputs a high potential to the first field-effect switch Q1 under the voltage division of the ninth resistor R9 and the tenth resistor R10. The first field-effect switch Q1 is turned on under the action of the high potential received at its gate, so that the power supply negative pin RELAY- of the relay and the ground terminal AGND are turned on.

[0086] like Figure 5 The power supply control module shown has its power input control signal SWITCH set high, turning on the third transistor T3. After T3 turns on, the gate of the second field-effect switch Q2 is pulled down to ground AGND. At this time, the second field-effect switch Q2 turns on, connecting the relay's positive power supply pin RELAY+ to the 12V voltage provided by the first power supply +12V_A.

[0087] In this way, the positive power supply pin RELAY+ of the relay is connected to the first power supply +12V_A, and the negative power supply pin RELAY- is connected to the ground terminal AGND. That is, the coil is connected in series in the power supply circuit between the first power supply +12V_A and the ground terminal AGND. At this time, the coil generates an induced electromotive force, the relay is energized, and the first contact pin P2 and the second contact pin P3 are connected. The power supply pin P1 of relay 1 is connected to the on / off feedback pin FB_RY.

[0088] The power input pin P1 of relay 1 is connected to the on / off feedback pin FB_RY. The on / off feedback pin FB_RY is connected to the first power supply +12V_A. Furthermore, through the voltage division of the twenty-ninth resistor R29 and the thirtieth resistor R30, a high-level signal is sent to the first control chip 5 and the second control chip 6 to inform the first control chip 5 and the second control chip 6 that the relay is in the energized state.

[0089] The current for maintaining the relay to be attracted is generally significantly less than the current required for the relay to be closed. Therefore, if the first power supply +12V_A is continuously used to maintain the relay to be closed after the relay is attracted, unnecessary energy loss will be increased, and energy will be wasted. Therefore, in order to reduce the energy loss, the first power supply +12V_A used for maintaining the relay to be attracted is switched to the second power supply +8V_A by the relay loss reduction control unit 32 and the loss reduction power supply unit 33 after the relay is attracted, so as to achieve the purpose of reducing the power loss.

[0090] Specifically, the relay power loss reduction process is as follows:

[0091] After the relay is attracted, the power input pin P1 of the relay 1 is connected to the on-off feedback pin FB_RY, the on-off feedback pin FB_RY is connected to the first power supply +12V_A, and the first power supply +12V_A input to the on-off feedback pin FB_RY is input to the follow-up unit. For the follow-up unit, the first power supply +12V_A received is input to the positive signal input end of the first operational amplifier U1A through the voltage division of the sixteenth resistor R16 and the seventeenth resistor R17. The first operational amplifier U1A is a voltage follower, so that the signal received by the positive signal input end of the first operational amplifier U1A is synchronized to the negative signal input end of the first operational amplifier U1A, and then is synchronized to the output end of the first operational amplifier U1A. The follow-up unit is used to prevent the large power consumption of the subsequent circuit from affecting the output of the first operational amplifier U1A.

[0092] The signal output from the output end of the first operational amplifier U1A is input to the negative signal input end of the second operational amplifier U2A with a latch function. The second operational amplifier U2A is a comparator. When the input voltage of the negative signal input end of the second operational amplifier U2A is less than the input voltage of the positive signal input end of the second operational amplifier U2A, the second operational amplifier U2A outputs a high resistance state, that is, the output of the second operational amplifier U2A is pulled up to the voltage +5V provided by the second input power supply +5V_A by the twenty-third resistor R23.

[0093] For the loss reduction output unit, the +5V voltage is received, so that the fourth triode T4 is turned on, the gate of the second field effect tube Q2 is set high, the second field effect tube Q2 is cut off, the positive electrode pin RELAY+ of the relay power supply is replaced by the +8V voltage provided by the loss reduction power supply unit, that is, the drain output of the second field effect tube Q2 is 0. At this time, the second power supply +8V_A supplies power to the positive electrode pin RELAY+ through the fourth diode D4, that is, the positive electrode pin RELAY+ and the negative electrode pin RELAY- of the power supply are connected to the power supply loop between the second power supply +8V_A and the ground terminal AGND, so as to achieve the purpose of loss reduction.

[0094] In a preferred embodiment, the relay disconnection process is as follows:

[0095] like Figure 3 In the redundant on / off control module shown, the first on / off control signal DRIVE1 and / or the second on / off control signal DRIVE2 are set to high level by the first control chip and the second control chip. At this time, the first transistor T1 and the second transistor T2 are in the on state, the gate of the first field-effect switch Q1 is pulled low, the first field-effect switch Q1 is turned off, and the power supply negative pin RELAY- of the relay is disconnected from the ground terminal AGND.

[0096] In this way, the power supply circuit between the first power supply +12V_A and the ground terminal AGND is disconnected from the coil. The induced electromotive force generated by the coil is discharged through the thirty-first resistor R31 and the eighth diode D8. After the discharge is completed, the relay is disconnected, the first contact pin P2 and the second contact pin P3 are disconnected, and the power supply input pin P1 of relay 1 is disconnected from the on / off feedback pin FB_RY.

[0097] After the relay is disconnected, the operation of the power supply control module is not affected by its disconnection. The operation of the power supply control module after the relay is disconnected is the same as the operation after the relay is engaged, and will not be described in detail here.

[0098] The advantages of this application are:

[0099] 1. Improve relay operation reliability: When the relay is closed, both the first on / off control signal and the second on / off control signal need to be set low and both need to be at a high level. When the relay is opened, the first on / off control signal and / or the second on / off control signal need to be set high. By using two signals to control the on / off of the relay, the stability and reliability of the relay operation are improved.

[0100] 2. This application introduces a relay loss reduction control unit and a loss reduction power supply unit, which completes the switching of the relay power supply after the relay is powered on and engaged, reducing the number of chip pins required to switch the relay power supply, reducing costs, and reducing power loss.

[0101] 3. The relay loss reduction control unit of this application has a delay unit, which can adjust the delay time for power supply switching after the relay is closed.

[0102] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system and the device described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0103] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0104] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0105] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application or the essential part or part of the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and various program code storage media.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and 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 relay on / off control circuit, characterized in that, The relay on / off control circuit includes a relay, a redundant on / off control module, a power supply control module, and an on / off signal feedback module. A coil is formed between the positive and negative power supply pins of the relay. The first input terminal of the redundant on / off control module is connected to the first on / off control signal, and the second input terminal of the redundant on / off control module is connected to the second on / off control signal. The output terminal of the redundant on / off control module is connected to the negative power supply pin of the relay, and the redundant on / off control module is also connected to the ground terminal. The input terminal of the power supply control module is connected to the power supply input control signal, the output terminal of the power supply control module is connected to the positive power supply pin of the relay, and the power supply terminal of the power supply control module is connected to the first power supply. The on / off signal feedback module is connected to the on / off feedback pin of the relay.

2. The relay on / off control circuit according to claim 1, characterized in that, The first on / off control signal is provided by the first control chip, the second on / off control signal is provided by the second control chip, and the power supply input control signal is provided by the first control chip or the second control chip; The input terminal of the on / off signal feedback module is connected to the on / off feedback pin of the relay, and the output terminal of the on / off signal feedback module is connected to the first control chip and the second control chip respectively.

3. The relay on / off control circuit according to claim 1, characterized in that, The redundant on / off control module includes a first on / off control unit, a second on / off control unit, and a third on / off control unit. The input terminal of the first on / off control unit is connected to the first on / off control signal, the power supply terminal of the first on / off control unit is connected to the first power supply, and the ground terminal of the first on / off control unit is connected to the power ground. The input terminal of the second on / off control unit is connected to the second on / off control signal, the power supply terminal of the second on / off control unit is connected to the first power supply, and the ground terminal of the second on / off control unit is connected to the power ground. The output terminal of the first on / off control unit is connected to the output terminal of the second on / off control unit and then connected to the input terminal of the third on / off control unit. The output terminal of the third on / off control unit is connected to the negative power supply pin of the relay. The power supply terminal of the third on / off control unit is connected to the first power supply. The ground terminal of the third on / off control unit is connected to the power ground.

4. The relay on / off control circuit according to claim 3, characterized in that, The first on / off control unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first diode, and a first transistor. Wherein, one end of the first resistor is connected to the first on / off control signal, the cathode of the first diode, one end of the second resistor, one end of the third resistor and one end of the fourth resistor, and the other end of the first resistor is connected to the first input power supply; The other end of the second resistor is connected to the first power supply and one end of the first capacitor, and the other end of the first capacitor is connected to the power ground. The other end of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to the anode of the first diode, the other end of the fourth resistor, and the power ground. The collector of the first transistor is connected to the output terminal of the second on / off control unit and then connected to the input terminal of the third on / off control unit.

5. The relay on / off control circuit according to claim 3, characterized in that, The second on / off control unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a second diode, and a second transistor. Wherein, one end of the fifth resistor is connected to the second on / off control signal, the cathode of the second diode, one end of the sixth resistor, one end of the seventh resistor and one end of the eighth resistor, and the other end of the fifth resistor is connected to the first input power supply; The other end of the sixth resistor is connected to the first power supply and one end of the second capacitor, and the other end of the second capacitor is connected to the power ground. The other end of the seventh resistor is connected to the base of the second transistor. The emitter of the second transistor is connected to the anode of the second diode, the other end of the eighth resistor, and the power ground. The collector of the second transistor is connected to the collector of the first transistor in the first on / off control unit and then connected to the input terminal of the third on / off control unit.

6. The relay on / off control circuit according to claim 3, characterized in that, The third on / off control unit includes a ninth resistor, a tenth resistor, an eleventh resistor, a first field-effect switch, and a third capacitor. Wherein, one end of the ninth resistor is connected to the collector of the first transistor in the first on / off control unit, the collector of the second transistor in the second on / off control unit, and one end of the tenth resistor, respectively; the other end of the ninth resistor is connected to one end of the third capacitor and the first power supply, respectively; and the other end of the third capacitor is connected to the power ground. The other end of the tenth resistor is connected to one end of the eleventh resistor and the gate of the first field-effect switch, the drain of the first field-effect switch is connected to the negative power supply pin of the relay, and the source of the first field-effect switch is connected to the power supply ground and the other end of the eleventh resistor.

7. The relay on / off control circuit according to claim 1, characterized in that, The power supply control module includes a relay power-on control unit, a follower unit, a comparison unit, a loss-reducing output unit, and a loss-reducing power supply unit. A controlled switch is formed between the power input pin and the on / off feedback pin of the relay. The first input terminal of the relay power-on control unit is connected to the power supply input control signal, the first power supply terminal of the relay power-on control unit is connected to the first power supply, and the output terminal of the relay power-on control unit is connected to the positive power supply pin of the relay. The power input pin of the relay is connected to the first power supply, the on / off feedback pin of the relay is connected to the input terminal of the follower unit, the output terminal of the follower unit is connected to the input terminal of the comparator unit, the output terminal of the comparator unit is connected to the input terminal of the loss reduction output unit, and the output terminal of the loss reduction output unit is connected to the second input terminal of the relay power-on control unit. The input terminal of the loss reduction power supply unit is connected to the second power supply, and the output terminal of the loss reduction power supply unit is connected to the second power supply terminal of the relay power-on control unit. The second power supply is lower than the first power supply.

8. The relay on / off control circuit according to claim 7, characterized in that, The relay power-on control unit includes a third diode, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third transistor, a second field-effect switch, a fourth capacitor, a fifth capacitor, and a sixth capacitor. The cathode of the third diode is connected to the power supply input control signal and one end of the twelfth resistor, respectively, and the anode of the third diode is connected to the power supply ground. The other end of the twelfth resistor is connected to one end of the thirteenth resistor and the base of the third transistor. The emitter of the third transistor is connected to the power ground after being connected to the other end of the thirteenth resistor. The collector of the third transistor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the gate of the second field-effect switch. The source of the second field-effect switch is connected to the other end of the fifteenth resistor, the first power supply, one end of the fourth capacitor, one end of the fifth capacitor, and one end of the sixth capacitor. The drain of the second field-effect switch is connected to the positive power supply pin of the relay and the output terminal of the loss reduction power supply unit.

9. The relay on / off control circuit according to claim 7, characterized in that, The power supply unit for reducing power loss includes a fourth diode, a seventh capacitor, an eighth capacitor, and a ninth capacitor. The cathode of the fourth diode is connected to the drain of the second field-effect switch in the relay power-on control unit, and the anode of the fourth diode is connected to the second power supply, one end of the seventh capacitor, one end of the eighth capacitor, and one end of the ninth capacitor, respectively. The other ends of the seventh capacitor, the eighth capacitor, and the ninth capacitor are all connected to the power supply ground.

10. The relay on / off control circuit according to claim 7, characterized in that, The follower unit includes a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a first operational amplifier. Wherein, one end of the sixteenth resistor is connected to the on / off feedback pin, the other end of the sixteenth resistor is connected to one end of the seventeenth resistor and the positive signal input terminal of the first operational amplifier, and the negative signal input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier and one end of the eighteenth resistor; The positive power input terminal of the first operational amplifier is connected to the second input power supply, one end of the tenth capacitor, and one end of the eleventh capacitor, respectively. The other ends of the tenth capacitor and the eleventh capacitor are connected to the power ground. The negative power input terminal of the first operational amplifier is connected to the other end of the seventeenth resistor and then connected to the power ground. The other end of the eighteenth resistor is connected to one end of the twelfth capacitor and one end of the nineteenth resistor, the other end of the twelfth capacitor is connected to the power supply ground, and the other end of the nineteenth resistor is connected to the input terminal of the comparator unit.

11. The relay on / off control circuit according to claim 7, characterized in that, The comparison unit includes a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a fifth diode, and a second operational amplifier. Wherein, one end of the twentieth resistor is connected to the other end of the nineteenth resistor in the follower unit and the negative signal input terminal of the second operational amplifier, and the other end of the twentieth resistor is connected to the output terminal of the second operational amplifier; The positive signal input terminal of the second operational amplifier is connected to one end of the second twelfth resistor and one end of the second eleventh resistor, respectively. The other end of the second twelfth resistor is connected to the power supply ground, and the other end of the second eleventh resistor is connected to the first power supply. The negative power supply input terminal of the second operational amplifier is connected to the power supply ground. The positive power supply input terminal of the second operational amplifier is connected to the second input power supply, one end of the thirteenth capacitor, and one end of the fourteenth capacitor, respectively. The other ends of the thirteenth capacitor and the other ends of the fourteenth capacitor are connected to the power supply ground. The output terminal of the second operational amplifier is also connected to one end of the twenty-third resistor and one end of the twenty-fourth resistor, respectively. The other end of the twenty-third resistor is connected to one end of the second input power supply and one end of the twenty-fifth resistor, respectively. The other end of the twenty-fourth resistor is connected to one end of the fifteenth capacitor and the cathode of the fifth diode, respectively. The other end of the fifteenth capacitor is connected to the power supply ground, and the anode of the fifth diode is connected to the other end of the twenty-fifth resistor and the input terminal of the loss reduction output unit, respectively. And / or, the loss-reduction output unit includes a sixth diode, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a seventh diode, and a fourth transistor. In this configuration, the anode of the sixth diode is connected to the other end of the twenty-fifth resistor in the comparator unit, the cathode of the sixth diode is connected to one end of the twenty-sixth resistor, the other end of the twenty-sixth resistor is connected to one end of the twenty-seventh resistor and the base of the fourth transistor, the emitter of the fourth transistor is connected to the power ground after being connected to the other end of the twenty-seventh resistor, the collector of the fourth transistor is connected to one end of the twenty-eighth resistor and the anode of the seventh diode, the other end of the twenty-eighth resistor is connected to the first power supply, and the cathode of the seventh diode is connected to the gate of the second field-effect switch in the relay power-on control unit.

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