Main relay control circuit, controller and vehicle

Abstract

The utility model discloses a main relay control circuit, a controller and a vehicle, and relates to the technical field of circuits, and the main relay control circuit comprises an enabling switch module, a protection switch module and a voltage division module. The enabling switch module is respectively connected with a power input positive end, an enabling control end and the protection switch module; the protection switch module is respectively connected with the voltage division module and the power supply input positive end; the voltage dividing module is connected with the source electrode and the grid electrode of the main relay. The enabling switch module can be switched on under the condition that the main relay is in a low-level enabling signal, and the main relay is switched off under the condition that the enabling control end is suspended, so that the power consumption is reduced, and the safety and the reliability are improved; the voltage division module can disconnect the main relay under the condition of a high-level enable signal, so that the stability of the circuit is improved; through the protection switch module, the main relay can be switched off in time under the condition of surge voltage brought by the load throwing effect, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field especially relates to a main relay control circuit, controller and vehicle. BACKGROUND

[0002] The main relay usually refers to the MOS pipe (MOSFET) in series on the main power supply, the existing main relay drive technology, the ability of anti-throwing load surge voltage is low, and it is easy to produce security hidden danger.

[0003] In summary, it is needed to provide a main relay control circuit, controller and vehicle capable of resisting surge voltage. UTILITY MODEL CONTENTS

[0004] To solve the above problems, the utility model provides a main relay control circuit, controller and vehicle.

[0005] In the first aspect, the application provides a main relay control circuit, comprising: an enable switch module, a protection switch module and a voltage division module;

[0006] The enable switch module is connected with the power input positive terminal, the enable control terminal and the protection switch module respectively;

[0007] The protection switch module is connected with the voltage division module and the power input positive terminal respectively;

[0008] The voltage division module is connected with the source and the gate of the main relay respectively.

[0009] Further, the main relay control circuit, the enable switch module comprises: a voltage division unit, a pull-up unit and an enable switch unit;

[0010] One end of the pull-up unit and the first end of the enable switch unit are connected with the power input positive terminal;

[0011] One end of the voltage division unit is connected with the enable control terminal and the other end of the pull-up unit, and the other end of the voltage division unit is connected with the second end of the enable switch unit;

[0012] The third end of the enable switch unit is connected with the protection switch module.

[0013] Further, the main relay control circuit, the enable switch unit comprises: a first triode, a second triode and a first resistor;

[0014] The base of the first triode is connected with the other end of the voltage division unit, the collector is connected with one end of the first resistor, and the emitter is connected with the ground terminal;

[0015] The base of the second triode is connected with the other end of the first resistor, the emitter is connected with one end of the pull-up unit and the positive end of the power input, and the collector is connected with the protection switch module.

[0016] Further, like the main relay control circuit, the voltage dividing unit comprises a second resistor and a third resistor.

[0017] One end of the second resistor is connected with the enable control end and the other end of the pull-up unit, and the other end of the second resistor is connected with one end of the third resistor and the base of the first triode.

[0018] The other end of the third resistor is connected with the ground end.

[0019] Further, like the main relay control circuit, the pull-up unit comprises a fourth resistor, one end of the fourth resistor is connected with the emitter of the second triode and the positive end of the power input, and the other end of the fourth resistor is connected with the enable control end.

[0020] Further, like the main relay control circuit, the protection switch module comprises a third triode, a fifth resistor, a sixth resistor and a voltage stabilizing diode.

[0021] The emitter of the third triode is connected with the positive end of the power input, one end of the fifth resistor and the emitter of the second triode, the base is connected with the other end of the fifth resistor and one end of the sixth resistor, and the collector is connected with the collector of the second triode.

[0022] The other end of the sixth resistor is connected with the cathode of the voltage stabilizing diode.

[0023] The anode of the voltage stabilizing diode is connected with the ground end.

[0024] Further, like the main relay control circuit, the voltage dividing module comprises a seventh resistor and an eighth resistor.

[0025] One end of the seventh resistor is connected with the source of the main relay, the emitter of the third triode and the positive end of the power input, and the other end of the seventh resistor is connected with the collector of the third triode, the gate of the main relay, the collector of the second triode and one end of the eighth resistor.

[0026] The other end of the eighth resistor is connected with the ground end.

[0027] Further, the main relay control circuit as described above further comprises a reverse connection protection module; the reverse connection protection module is arranged between the power input positive terminal and the enable switch module, the protection switch module, the voltage division module and the main relay.

[0028] In a second aspect, the application provides a controller comprising the main relay control circuit according to any one of the first aspect.

[0029] In a third aspect, the application provides a vehicle comprising the controller according to the second aspect.

[0030] The enable switch module can turn on the main relay under the condition of a low-level enable signal, and turn off the main relay under the condition of a floating enable control terminal, thereby reducing power consumption and improving safety and reliability; the voltage division module can turn off the main relay under the condition of a high-level enable signal, thereby improving the stability of the circuit; through the protection switch module, the main relay can be turned off in time under the condition of a surge voltage caused by a load throwing effect, thereby improving safety. BRIEF DESCRIPTION OF DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Furthermore, the drawings are not necessarily drawn to scale and the same reference numbers in different drawings represent the same components. In the drawings:

[0032] Figure 1 is a schematic diagram of a main relay control circuit provided by the application;

[0033] Figure 2 is a schematic diagram of another main relay control circuit provided by the application. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the application will be described hereinafter with reference to the accompanying drawings. Although the exemplary embodiments of the application are shown in the drawings, it should be understood that the application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the application can be more thoroughly and completely understood, and the scope of the application can be accurately conveyed to those skilled in the art.

[0035] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0036] An electronic control unit (ECU) is a comprehensive control device of an engine. Its function is to perform calculation, processing, judgment on various information input by sensors of the engine according to the program stored therein, and then output instructions to control the action of the relevant actuators, so as to achieve the purpose of fast, accurate and automatic control of the engine. The main relay is an important component in the electronic control unit, so it is necessary to ensure its safety, reliability and low power consumption.

[0037] There are three common ways to drive the main relay: one is based on a dedicated main relay drive chip, when the enable signal arrives, the drive chip outputs a voltage that meets the conduction condition of the main relay. The main relay usually refers to a MOS tube (MOSFET) such as NMOS connected in series with the main power supply. The drive chip outputs a voltage that meets the conduction condition of the MOS tube (such as NMOS), i.e. VGS≥Vgs-th; the second is based on a P-channel MOSFET. Because the conduction of PMOS only requires the gate voltage to be lower than the source, and meets VGS≤Vgs-th (here VGS is negative), it does not require an additional drive chip, and only needs to configure a resistance divider to achieve the function; the third is to use a traditional mechanical relay as a switch on the main power path.

[0038] However, for the first existing solution, the enable signal of the drive chip is triggered by a high level. When the enable signal (such as a vehicle power-on enable signal) is greater than 6V, the drive chip outputs a gate drive voltage to turn on the main relay, which cannot meet the demand of low-level enable and will increase power consumption.

[0039] For the second existing solution, the characteristics of PMOS components determine that the impedance of the conduction is larger than that of NMOS. After passing through a large current, the PMOS in series will have a serious heating phenomenon. In addition, the main relay realized by PMOS, without other additional protection circuits, will make the electronic devices behind the PMOS directly face a surge voltage of up to 200V when a surge voltage exists, which will cause many devices to be damaged, and the reliability and safety will be seriously reduced.

[0040] For the third existing solution, the traditional mechanical relay controls the driving coil to generate a magnetic field to attract the controlled armature. When there are more capacitive loads in the electronic control unit, the instantaneous current will be very large, so the instantaneous conduction will generate sparks at the contact point of the armature. Over time, the sparks will cause many pits, and more seriously, the armature will be stuck, resulting in the phenomenon that it cannot be effectively disconnected, thereby causing the controller to lose power, which seriously affects the safety.

[0041] Therefore, in order to solve the above problems, the embodiment of the present application proposes a main relay control circuit, a controller and a vehicle.

[0042] In a first aspect, as shown in the drawings, according to the embodiment of the present application, a main relay control circuit is provided, comprising: an enable switch module 100, a protection switch module 200 and a voltage division module 300. The enable switch module 100 is connected with a power input positive terminal VBAT+, an enable control terminal S and the protection switch module 200 respectively; the protection switch module 200 is connected with the voltage division module 300 and the power input positive terminal VBAT+ respectively; and the voltage division module 300 is connected with a source electrode and a gate electrode of a main relay M1 respectively. Figure 1 As shown in the drawings, the enable switch module 100 comprises: a voltage division unit 101, a pull-up unit 102 and an enable switch unit 103. One end of the pull-up unit 102 and a first end of the enable switch unit 103 are connected with the power input positive terminal VBAT+; one end of the voltage division unit 101 is connected with the enable control terminal S and the other end of the pull-up unit 102, and the other end of the voltage division unit 101 is connected with a second end of the enable switch unit 103; and a third end of the enable switch unit 103 is connected with the protection switch module 200.

[0043] Figure 2 The main relay M1 comprises a PMOS tube.

[0044] As shown in the drawings, the enable switch unit 103 comprises: a first triode Q1, a second triode Q2 and a first resistor R1. The base electrode of the first triode Q1 is connected with the other end of the voltage division unit 101, the collector electrode is connected with one end of the first resistor R1, and the emitter electrode is connected with a ground terminal GND; the base electrode of the second triode Q2 is connected with the other end of the first resistor R1, the emitter electrode is connected with one end of the pull-up unit 102 and the power input positive terminal VBAT+, and the collector electrode is connected with the protection switch module 200.

[0045] As shown in the drawings, the voltage division unit 101 comprises: a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected with the enable control terminal S and the other end of the pull-up unit 102, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the base electrode of the first triode Q1, and the other end of the third resistor R3 is connected with the ground terminal GND. Figure 2 As shown in the drawings, the voltage division unit 101 comprises: a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected with the enable control terminal S and the other end of the pull-up unit 102, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the base electrode of the first triode Q1, and the other end of the third resistor R3 is connected with the ground terminal GND.

[0046] Figure 2 As shown in the drawings, the voltage division unit 101 comprises: a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected with the enable control terminal S and the other end of the pull-up unit 102, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the base electrode of the first triode Q1, and the other end of the third resistor R3 is connected with the ground terminal GND.

[0047] As shown in the drawings, the voltage division unit 101 comprises: a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected with the enable control terminal S and the other end of the pull-up unit 102, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the base electrode of the first triode Q1, and the other end of the third resistor R3 is connected with the ground terminal GND. Figure 2 ​​As shown, a third capacitor C3 is further included between the voltage divider unit 101 and the enable switch unit 103. One end of the third capacitor C3 is connected to the base of the first transistor Q1, and the other end is connected to the ground terminal GND. The third capacitor C3 is used to filter the enable signal, thereby increasing the stability of power-up and power-down using a low-level enable signal.

[0048] like Figure 2 As shown, the pull-up unit 102 includes a fourth resistor R4 , one end of which is connected to the emitter of the second transistor Q2 and the positive power input terminal VBAT+, and the other end of which is connected to the enable control terminal S.

[0049] like Figure 2 As shown, the protection switch module 200 includes: a third transistor Q3, a fifth resistor R5, a sixth resistor R6, and a Zener diode Z1. The emitter of the third transistor Q3 is connected to the positive power input terminal VBAT+, one end of the fifth resistor R5, and the emitter of the second transistor Q2; the base is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6; and the collector is connected to the collector of the second transistor Q2; the other end of the sixth resistor R6 is connected to the cathode of the Zener diode; and the anode of the Zener diode is connected to the ground terminal GND.

[0050] like Figure 2 As shown, the voltage divider module 300 includes a seventh resistor R7 and an eighth resistor R8. One end of the seventh resistor R7 is connected to the source of the main relay M1, the emitter of the third transistor Q3, and the positive power input terminal VBAT+, and the other end is connected to the collector of the third transistor Q3, the gate of the main relay M1, the collector of the second transistor Q2, and one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the ground terminal GND.

[0051] The embodiment of the present application further includes a reverse connection protection module 400 ; the reverse connection protection module 400 is provided between the power input positive terminal VBAT+ and the enabling switch module 100 , the protection switch module 200 , the voltage dividing module 300 and the main relay M1 .

[0052] like Figure 2 As shown, the reverse connection protection module 400 includes a first diode D1 , wherein the anode of the first diode D1 is connected to the positive power input terminal VBAT+, and the cathode of the first diode D1 is connected to the source of the main relay M1 .

[0053] like Figure 2As shown, the embodiments of the present application further include a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is connected to the power input positive terminal VBAT+, and the other end is connected to the power input negative terminal VBAT- and the ground terminal GND. One end of the second capacitor C2 is connected to the enable control terminal S, and the other end is connected to the ground terminal GND.

[0054] As shown, the embodiments of the present application further include a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is connected to the power input positive terminal VBAT+, and the other end is connected to the power input negative terminal VBAT- and the ground terminal GND. One end of the second capacitor C2 is connected to the enable control terminal S, and the other end is connected to the ground terminal GND. Figure 2 As shown, the embodiments of the present application further include an actuator and other circuits (actuator other circuits), such as a driving motor circuit. The drain of the main relay M1 is connected to one end of the actuator or other circuits, and is also connected to one end of the fourth capacitor C4 and one end of the fifth capacitor C5. The fourth capacitor C4 and the fifth capacitor C5 are used to store power for the actuator or other circuits, so that the actuator or other circuits can operate stably.

[0055] As shown, the embodiments of the present application further include an actuator and other circuits (actuator other circuits), such as a driving motor circuit. The drain of the main relay M1 is connected to one end of the actuator or other circuits, and is also connected to one end of the fourth capacitor C4 and one end of the fifth capacitor C5. The fourth capacitor C4 and the fifth capacitor C5 are used to store power for the actuator or other circuits, so that the actuator or other circuits can operate stably. Figure 2 As shown, the first capacitor C1 is arranged between the power input positive terminal VBAT+ and the power input negative terminal VBAT-, and the second capacitor C2 is arranged between the enable control terminal S and the ground terminal GND. The enable control terminal S inputs an enable control signal. The first capacitor C1 and the second capacitor C2 are interface capacitors, which are usually used to solve electromagnetic compatibility (EMC) problems, so as to improve the ability of the circuit to resist electromagnetic interference (EMI) and electromagnetic sensitivity (EMS), such as noise.

[0056] Figure 2 The first diode D1 of the reverse connection protection module 400 is used for reverse connection protection, that is, when the power input positive terminal VBAT+ and the power input negative terminal VBAT- are reversely connected, the first diode D1 can prevent other devices from being damaged due to the reverse flow of current, thereby improving the safety of the circuit. The first diode D1 can be selected from diodes with low forward voltage drop, strong current carrying capacity and good heat dissipation performance.

[0057] When the enable signal is high (i.e., the enable control terminal S inputs a high enable signal), the first transistor Q1 in the enable switch unit 103 is turned on after being divided by the second resistor R2 and the third resistor R3 in the voltage dividing unit 101. The voltage input by the power input positive terminal VBAT+ flows through the first transistor Q1 through the fourth resistor R4 after passing through the BE junction of the first diode D1 and the second transistor Q2, and the second transistor Q2 is turned on. At this time, the voltage of the power input positive terminal VBAT+ is equal to the gate voltage of the main relay M1, so the conduction condition VGS≥Vgs-th of the main relay M1 is not met, and the main relay M1 is in the off (open) state, and the entire circuit (system) is in the power-off state.

[0058] When the enable signal is high (i.e., the enable control terminal S inputs a high enable signal), the first transistor Q1 in the enable switch unit 103 is turned on after being divided by the second resistor R2 and the third resistor R3 in the voltage dividing unit 101. The voltage input by the power input positive terminal VBAT+ flows through the first transistor Q1 through the fourth resistor R4 after passing through the BE junction of the first diode D1 and the second transistor Q2, and the second transistor Q2 is turned on. At this time, the voltage of the power input positive terminal VBAT+ is equal to the gate voltage of the main relay M1, so the conduction condition VGS≥Vgs-th of the main relay M1 is not met, and the main relay M1 is in the off (open) state, and the entire circuit (system) is in the power-off state.

[0059] ​When the wiring harness of the enable control terminal S is disconnected and left open, the pull-up action of the fourth resistor R4 in the pull-up unit 102, coupled with the voltage division by the second resistor R2 and the third resistor R3 in the voltage divider unit 101, still ensures that the first transistor Q1 and the second transistor Q2 are turned on, thereby reliably keeping the main relay M1 in the closed (disconnected) state. This state is very important because there is a certain probability that the wiring harness in the vehicle will be damaged or the connector will be loose, resulting in poor contact. If the open circuit of the enable signal causes the main relay M1 to be misconnected, the controller represented by this circuit (the connected controller) will be mistakenly started. If this controller is the control circuit of the oil pump, the oil pump will begin to operate in an undesirable state, and the oil pumping and pressure will be out of control, thereby causing operational failure of the entire vehicle and posing a significant reliability risk. In addition, if the control circuit is mistakenly powered on due to the open circuit of the enable control terminal S, the quiescent current in the circuit will be much higher than the expected standby current (such as less than 1mA), which will eventually greatly shorten the standby time of the battery and cause problems in starting the car.

[0060] When the enable signal input to the enable control terminal S is low, the base of the first transistor Q1 is low, so the first transistor Q1 is not conducting, and thus the second transistor Q2 is also not conducting. The voltage input to the positive power input terminal VBAT+ is divided by the seventh resistor R7 and the eighth resistor R8 of the voltage divider module 300, so that the gate voltage of the main relay M1 is lower than the voltage at the positive power input terminal VBAT+, thereby meeting the conduction condition of the PMOS transistor of the main relay M1. At this time, the main relay M1 is turned on, and the entire system is powered on, meeting the requirement that the enable signal is active low.

[0061] like Figure 2 As shown, when there is a surge voltage caused by the load dump effect at the positive terminal VBAT+ of the power input, the protection switch module 200 can close the main relay M1 in time, thereby preventing the surge high voltage from passing through M1 and damaging the subsequent electronic components. The protection switch module 200 includes a series circuit consisting of a fifth resistor R5, a sixth resistor R6 and a Zener diode Z1. When the surge voltage is higher than the reverse conduction voltage of the Zener diode Z1, the fifth resistor R5 and the sixth resistor R6 form a voltage divider circuit, which can make the base voltage of the third transistor Q3 lower than the emitter voltage, thereby turning on the third transistor Q3, thereby making the gate-source voltage of the main relay M1 equal, and the main relay M1 is closed (disconnected) in time to protect the safety of the subsequent circuit. When the surge voltage decays below the reverse voltage of the Zener diode Z1, the main relay M1 is turned on (conducted) again to ensure the necessary requirements of the circuit function.

[0062] The existing main relay driving is mostly high level enable effective, in order to deal with special application requirements, the embodiment of the application proposes a low level enable main relay control circuit, and meets the various needs of the power port.

[0063] In addition to the low level enable, high level and suspended non enable characteristics, the embodiment of the application can also maintain the static current below 1mA, greatly improving the power supply system electrical connection flexibility of the system, reducing standby power consumption, and prolonging the standby time of the battery.

[0064] In addition, the embodiment of the application also has strong resistance to the ability of the surge voltage of the thrown load, so as to protect the electronic devices behind the main relay M1 from being damaged by the surge voltage.

[0065] Although a dedicated MOS driving chip can be used, the low effective enable signal can be inverted to high level effective by designing the inversion circuit of the enable signal, so that the dedicated chip can be used. However, this will greatly increase the cost. The devices used in the embodiment of the application are common devices, which can reduce the cost.

[0066] In the second aspect, according to the embodiment of the application, a controller is provided, which comprises the main relay control circuit according to any one of the first aspect.

[0067] The controller comprises a water pump controller, an oil pump controller, a urea pump controller and the like of the vehicle.

[0068] In the third aspect, according to the embodiment of the application, a vehicle is provided, which comprises the controller according to the second aspect.

[0069] The benefits of the embodiment are that the enable switch module can enable the conduction of the main relay when the enable signal is low, thereby avoiding the problem of too high static current caused by the use of logic chip in the power interface (power input positive and power input negative). In addition, the protection switch module and the voltage division module can also cope with the impact of surge voltage, so as to effectively protect the devices behind the main relay, and the cost advantage is obvious. The embodiment of the application can also ensure that the main relay is effectively closed when the enable signal is high or open circuit. In addition, when the surge voltage is higher than a certain set value, the main relay can also be closed in time. At the same time, the static current can be maintained below 1mA, thereby greatly reducing the standby current of the whole system.

[0070] The above described in the specification is only an example of the present application. The skilled in the art to which the present application belongs can make various modifications or supplements or adopt similar ways instead of the described specific embodiments, as long as it does not deviate from the content of the specification of the present application or beyond the scope defined by the claims, it shall belong to the protection scope of the present application.

Claims

1. A main relay control circuit characterized by comprising: include: Enabling switch module, protection switch module and voltage divider module; The enabling switch module is connected to the positive power input terminal, the enabling control terminal and the protection switch module respectively; The protection switch module is connected to the voltage divider module and the positive terminal of the power input respectively; The voltage dividing module is connected to the source and the gate of the main relay respectively.

2. The control circuit of claim 1, wherein, The enabling switch module includes: a voltage dividing unit, a pull-up unit and an enabling switch unit; One end of the pull-up unit and the first end of the enable switch unit are both connected to the positive power input terminal; One end of the voltage dividing unit is connected to the enable control end and the other end of the pull-up unit, and the other end of the voltage dividing unit is connected to the second end of the enable switch unit; The third end of the enabling switch unit is connected to the protection switch module.

3. The control circuit of claim 2, wherein, The enabling switch unit includes: a first transistor, a second transistor and a first resistor; The base of the first transistor is connected to the other end of the voltage dividing unit, the collector is connected to one end of the first resistor, and the emitter is connected to the ground end; The base of the second transistor is connected to the other end of the first resistor, the emitter is connected to one end of the pull-up unit and the positive power input terminal, and the collector is connected to the protection switch module.

4. The control circuit of claim 3, wherein, The voltage dividing unit includes: a second resistor and a third resistor; One end of the second resistor is connected to the enable control end and the other end of the pull-up unit, and the other end of the second resistor is connected to one end of the third resistor and the base of the first transistor; The other end of the third resistor is connected to the ground.

5. The control circuit of claim 3, wherein, The pull-up unit includes a fourth resistor; one end of the fourth resistor is connected to the emitter of the second transistor and the positive power input terminal, and the other end is connected to the enable control terminal.

6. The control circuit of claim 3, wherein, The protection switch module includes: a third transistor, a fifth resistor, a sixth resistor and a voltage stabilizing diode; The emitter of the third transistor is connected to the positive terminal of the power input, one end of the fifth resistor and the emitter of the second transistor, the base is connected to the other end of the fifth resistor and one end of the sixth resistor, and the collector is connected to the collector of the second transistor; The other end of the sixth resistor is connected to the cathode of the voltage stabilizing diode; The anode of the voltage stabilizing diode is connected to the ground terminal.

7. The control circuit of claim 6, wherein, The voltage dividing module includes: a seventh resistor and an eighth resistor; One end of the seventh resistor is connected to the source of the main relay, the emitter of the third transistor and the positive terminal of the power input, and the other end is connected to the collector of the third transistor, the gate of the main relay, the collector of the second transistor and one end of the eighth resistor; The other end of the eighth resistor is connected to the ground.

8. The control circuit of claim 1, wherein, It also includes a reverse connection protection module; the reverse connection protection module is arranged between the positive end of the power input and the enabling switch module, the protection switch module, the voltage dividing module and the main relay.

9. A controller characterized by comprising: The device comprises a main relay control circuit according to any one of claims 1 to 8.

10. A vehicle characterized by comprising: Comprising the controller as claimed in claim 9.

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