A control device and method for a driving circuit and an automobile power distribution system

Abstract

The present invention discloses a control device for a drive circuit, an automobile power distribution system and a control method for its drive circuit, the device comprising: a drive and short-circuit protection unit; further comprising: a drive state detection unit and / or an anti-reverse connection unit; wherein the drive and short-circuit protection unit is used to provide a drive signal for a device to be driven and can realize short-circuit protection; the drive state detection unit is used to determine the operating state of the drive and short-circuit protection unit based on the drive signal, so as to remind and shut down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal; and / or the anti-reverse connection unit is used to perform anti-reverse connection protection on the power supply of the drive signal. The solution of the present invention can solve the problem that the low-voltage side of the automobile power distribution system is not detected and protected, which affects the safety of the automobile power distribution system, and achieve the effect of improving the safety of the automobile power distribution system.

Description

Technical Field

[0001] The present invention belongs to the field of power distribution technology, and specifically relates to a control device for a drive circuit, an automobile power distribution system and a control method for a drive circuit thereof, and more particularly to a device for protecting and detecting a drive circuit used in a high-voltage power distribution system of an electric vehicle, an automobile power distribution system and a control method for a drive circuit thereof. Background Art

[0002] The power distribution system is the main component of the automobile power system. With the rapid development of the automobile industry, the performance requirements for the automobile power distribution system are becoming higher and higher. Therefore, it is necessary to protect the automobile power distribution system and accurately feedback fault information.

[0003] In some schemes, the high-voltage side of the automobile power distribution system is detected and protected to feedback fault information on the high-voltage side and protect the automobile power distribution system, but the low-voltage side of the automobile power distribution system is not detected and protected. Once a fault occurs on the low-voltage side, the fault information cannot be accurately fed back, affecting the safety of the automobile power distribution system.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a control device for a drive circuit, an automobile power distribution system and a control method for its drive circuit, so as to solve the problem that the low-voltage side of the automobile power distribution system is not detected and protected, which affects the safety of the automobile power distribution system, thereby achieving the effect of improving the safety of the automobile power distribution system.

[0006] The present invention provides a control device for a drive circuit, comprising: a drive and short-circuit protection unit; and further comprising: a drive state detection unit and / or an anti-reverse connection unit; wherein the drive and short-circuit protection unit is used to provide a drive signal for a device to be driven and to achieve short-circuit protection; the drive state detection unit is used to determine the operating state of the drive and short-circuit protection unit based on the drive signal, so as to give a reminder and shut down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal; and / or the anti-reverse connection unit is used to perform anti-reverse connection protection on the power supply of the drive signal.

[0007] Optionally, the driving and short-circuit protection unit includes: a first-level driving and protection circuit and a second-level driving and protection circuit; wherein, the input end of the first-level driving and protection circuit is used to receive a first control signal; the output end of the first-level driving and protection circuit is output to the second input end of the second-level driving and protection circuit; the first input end of the second-level driving and protection circuit is used to receive a second control signal; the output end of the second-level driving and protection circuit is used to output the driving signal to the driving end of the device to be driven.

[0008] Optionally, the first-stage drive and protection circuit and the second-stage drive and protection circuit have the same structure; wherein, the first-stage drive and protection circuit comprises: a first operational amplifier module, a first isolation module, a first current limiting module and a first switching tube; the first operational amplifier module is used to perform operational amplification processing on the first control signal to obtain a first processed signal; the first isolation module is used to perform isolation protection between the first processed signal and the first power supply to obtain a first isolated signal; the first current limiting module is used to perform current limiting protection on the power supply end of the first isolation module; the first switching tube is used to use the first power supply as the power supply and the first isolation signal as the control signal to output a first switching signal, and the first switching signal is output to the second input end of the second-stage drive and protection circuit.

[0009] Optionally, the first operational amplifier module includes: a first resistor module, a second resistor module, a third resistor module, a first capacitor module and a first operational amplifier module; wherein the first resistor module is arranged at the non-inverting input terminal of the first operational amplifier module for receiving the first control signal; the second resistor module is arranged at the inverting input terminal of the operational amplifier module; the third resistor module and the first capacitor module are arranged in parallel between the inverting input terminal of the first operational amplifier module and the output terminal of the first operational amplifier module.

[0010] Optionally, the driving state detection unit includes: a sampling module, a first-stage operational amplifier module and a second-stage operational amplifier module; wherein the sampling module is used to collect the driving signal output by the driving and protection unit to obtain a sampling signal; the first-stage operational amplifier module is used to perform a first-stage operational amplification processing on the sampling signal to obtain a first-stage operational amplification signal; the second-stage operational amplifier module is used to perform a second-stage operational amplification processing on the first-stage operational amplification signal to obtain a second-stage operational amplification signal as a feedback signal, so as to determine the operating state of the driving and protection unit according to the feedback signal, and then to remind and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal.

[0011] Optionally, the driving state detection unit further includes: a first filtering module and / or a second filtering module and / or a clamping module; wherein the first filtering module is arranged at the output end of the second-stage operational amplifier module, and is used to filter the feedback signal; and / or the second filtering module is arranged at the input end of the sampling module, and is used to filter the driving signal; and / or the clamping module is arranged at the inverting input end of the first-stage operational amplifier module and is connected to a third power supply, and is used to prevent the sampling signal from being greater than a preset value.

[0012] Optionally, the sampling module includes: a first voltage divider module and a second voltage divider module; the first voltage divider module and the second voltage divider module are arranged in series at the output end of the driving and protection unit, and the common end of the first voltage divider module and the second voltage divider module is the sampling end.

[0013] Optionally, the first-stage operational amplifier module and the second-stage operational amplifier module have the same structure; wherein the first-stage operational amplifier module includes: a fifth resistor module, a sixth resistor module, a seventh resistor module and a second operational amplifier module; wherein the fifth resistor module is arranged between the sampling end of the sampling module and the inverting input end of the second operational amplifier module; the sixth resistor module is arranged at the non-inverting input end of the second operational amplifier module; and the seventh resistor module is arranged in parallel between the inverting input end of the second operational amplifier module and the output end of the second operational amplifier module.

[0014] Optionally, the anti-reverse connection unit comprises: a diode module; an anode of the diode module is connected to an end of the second voltage divider module away from the first voltage divider module.

[0015] Matching the above device, the present invention provides a vehicle power distribution system on another aspect, including: the control device of the drive circuit mentioned above.

[0016] Matching the above-mentioned automobile power distribution system, the present invention provides a control method for a drive circuit of an automobile power distribution system on another aspect, comprising: issuing a connection instruction when a device to be driven needs to be connected; or issuing a shutdown instruction when a device to be driven needs to be shut down; if the connection instruction is received, determining the operating state of the drive and short-circuit protection unit based on the drive signal in a first control mode, so as to give a reminder and shut down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal; if the shutdown instruction is received, determining the operating state of the drive and short-circuit protection unit based on the drive signal in a second control mode, so as to give a reminder and shut down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal.

[0017] Optionally, according to a first control mode, the operating state of the drive and short-circuit protection unit is determined based on the drive signal, so as to give a reminder and shut down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal, including: according to the connection instruction, controlling the first control signal and the second control signal to output a first set level, driving the first switch tube and the second switch tube to be connected and work, and detecting a feedback signal; determining whether the feedback signal is the first set level; if the feedback signal is the first set level, determining that the operating state of the drive and protection unit is normal, and controlling the device to be driven to be connected and run; if the feedback signal is not the first set level, determining that the operating state of the drive and protection unit is abnormal, and initiating a first reminder message that the drive and protection unit is abnormal and cannot be driven normally.

[0018] Optionally, according to the second control mode, the operating state of the driving and short-circuit protection unit is determined based on the driving signal, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal, including: according to the shutdown instruction, controlling the first control signal to output a first set level, and controlling the second control signal to output a second set level, driving the first switch tube to be turned on and work, and controlling the second switch tube to be turned off, and detecting the feedback signal; determining whether the feedback signal is the second set level; if the feedback signal is the second set level, determining that the operating state of the second switch tube in the driving and protection unit is normal, and controlling the device to be driven to be turned off; if the feedback signal is not the second set level, determining that the operating state of the second switch tube in the driving and protection unit is abnormal, and determining whether the operating state of the first switch tube in the driving and protection unit is normal.

[0019] Optionally, determining whether the operating state of the first switch tube in the driving and protection unit is a normal state includes: controlling the first control signal to output the second set level, controlling the first switch tube to be turned off, and detecting the feedback signal again; determining whether the feedback signal detected again is the second set level; if the feedback signal detected again is the second set level, determining that the operating state of the first switch tube in the driving and protection unit is a normal state, and controlling the device to be driven to be turned off; if the feedback signal detected again is not the second set level, determining that the operating state of the first switch tube in the driving and protection unit is an abnormal state, and initiating a second reminder message that the driving and protection unit is abnormal and cannot be shut down normally.

[0020] Therefore, the scheme of the present invention adopts dual MOSFET driving protection at the input end of the low-voltage side of the driving circuit of the high-voltage distribution system of the electric vehicle, and adds an anti-reverse connection diode at the output end of the low-voltage side of the driving circuit; at the same time, the output end of the low-voltage side of the driving circuit is fed back through voltage division sampling to perform real-time detection of the driving state of the driving circuit, and timely feedback of the fault information of the driving circuit, so as to solve the problem that the low-voltage side of the automobile distribution system is not detected and protected, which affects the safety of the automobile distribution system, and achieve the effect of improving the safety of the automobile distribution system.

[0021] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an embodiment of a control device for a drive circuit of the present invention;

[0024] Figure 2 A schematic diagram of the structure of an embodiment of a driving circuit of a high-voltage power distribution system for an electric vehicle;

[0025] Figure 3 is a structural schematic diagram of an embodiment of a first-stage MOSFET driving circuit;

[0026] Figure 4 is a structural schematic diagram of an embodiment of a second-stage MOSFET driving circuit;

[0027] Figure 5 A schematic structural diagram of an embodiment of a relay state detection feedback circuit;

[0028] Figure 6 A driving process diagram of an embodiment of a driving circuit of a high voltage power distribution system of an electric vehicle;

[0029] Figure 7 A schematic flow chart of an embodiment of a method for controlling a driving circuit of the present invention;

[0030] Figure 8 It is a flow chart of an embodiment of the method of the present invention for reminding and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal according to the first control mode;

[0031] Fig. 9A flow chart of an embodiment of the method of the present invention for reminding and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal according to the second control mode;

[0032] Fig.10 The present invention is a flow chart of an embodiment of determining whether the operation state of the first switch tube in the driving and protection unit is a normal state in the method of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] According to an embodiment of the present invention, a control device for a drive circuit is provided. Figure 1 The structure diagram of an embodiment of the device of the present invention is shown. The control device of the drive circuit can be used in the low-voltage drive circuit of the relay in the high-voltage power distribution system of the electric vehicle. The control device of the low-voltage drive circuit of the relay in the high-voltage power distribution system of the electric vehicle can include: a drive and short-circuit protection unit; and can also include: a drive state detection unit and / or an anti-reverse connection unit. The anti-reverse connection unit and / or the drive state detection unit are arranged at the output end of the two-stage drive unit.

[0035] In an optional example, the driving and short circuit protection unit is arranged on the low voltage driving side of the driven device, and can be used to provide a driving signal for the driven device and realize short circuit protection. The driven device can include a relay, such as relay K1 which can be used as a control switch on the high voltage side.

[0036] Optionally, the driving and short-circuit protection unit may include: a first-stage driving and protection circuit and a second-stage driving and protection circuit.

[0037] The input end of the first-stage driving and protection circuit can be used to receive a first control signal (such as a first control signal V1). The output end of the first-stage driving and protection circuit is output to the second input end of the second-stage driving and protection circuit.

[0038] The first input terminal of the second-stage driving and protection circuit can be used to receive a second control signal (such as a second control signal V2). The output terminal of the second-stage driving and protection circuit can be used to output the driving signal to the driving terminal of the device to be driven.

[0039] For example: the driving and short-circuit protection unit can adopt dual MOSFET driving protection.

[0040] Therefore, by adopting dual MOSFET driving protection, the problem of misconduction caused by short circuit of single MOSFET can be solved, and short circuit protection can be achieved.

[0041] More optionally, the first-stage driving and protection circuit and the second-stage driving and protection circuit have the same structure. The first-stage driving and protection circuit may include: a first operational amplifier module, a first isolation module (such as a first optical coupler isolator OC1), a first current limiting module (such as a fourth resistor R4) and a first switch tube (such as a first MOS tube Q1).

[0042] Specifically, the first operational amplifier module is arranged at the first output end (ie, the output end of the first control signal) of a controller such as a DSP processor, and can be used to perform operational amplification processing on the first control signal to obtain a first processed signal.

[0043] Further optionally, the first operational amplifier module may include: a first resistor module (such as a first resistor R1), a second resistor module (such as a second resistor R2), a third resistor module (such as a third resistor R3), a first capacitor module (such as a first capacitor C1) and a first operational amplifier module (such as a first operational amplifier U1).

[0044] The first resistor module is arranged at the non-inverting input terminal of the first operational amplifier module and can be used to receive the first control signal. The second resistor module is arranged at the inverting input terminal of the operational amplifier module. The third resistor module and the first capacitor module are arranged in parallel between the inverting input terminal of the first operational amplifier module and the output terminal of the first operational amplifier module.

[0045] For example, the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1 and the first operational amplifier U1 form an operational amplifier circuit, which performs operational amplification on the output signal of the DSP processor.

[0046] Therefore, the first operational amplifier module is formed by the first resistor module, the second resistor module, the third resistor module, the first capacitor module and the first operational amplifier module, etc., so that reliable and accurate operational amplifier processing can be achieved with a simple structure.

[0047] Specifically, the first isolation module is arranged between the first operational amplifier module and the first power supply VCC1, and can be used to isolate and protect the first processing signal from the first power supply to obtain a first isolated signal. For example, the first optical coupler isolator OC1 isolates the first power supply VCC1 from the DSP processor to play an isolation and protection role.

[0048] Specifically, the first current limiting module is disposed between the first power supply VCC1 and the first isolation module, and can be used to perform current limiting protection on the power supply end of the first isolation module. For example, the fourth resistor R4 serves the purpose of current limiting protection.

[0049] Specifically, the first switch tube is respectively configured in cooperation with the first isolation module, the first current module and the first power supply VCC1, and can be used to use the first power supply as the power supply and the first isolation signal as the control signal to output a first switch signal, and the first switch signal is output to the second input end of the second-stage drive and protection circuit. For example, the first MOS tube Q1 plays the role of a control switch.

[0050] Therefore, the first stage driving and protection circuit is formed by the first operational amplifier module, the first isolation module, the first current limiting module and the first switch tube, and the first control signal can be processed by operational amplifier, isolation, current limiting and the like before switching. The structure is simple, the control method is simple and the protection effect is good.

[0051] In an optional example, the driving state detection unit is arranged at the output end of the driving and short-circuit protection unit, and can be used to determine the operating state of the driving and short-circuit protection unit based on the driving signal, so that the controller can remind and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal.

[0052] Optionally, the driving state detection unit may include: a sampling module, a first-stage operational amplifier module and a second-stage operational amplifier module.

[0053] Specifically, the sampling module is arranged at the output end of the driving and protection unit, and can be used to collect the driving signal output by the driving and protection unit to obtain a sampling signal.

[0054] More optionally, the sampling module may include: a first voltage dividing module and a second voltage dividing module. The first voltage dividing module and the second voltage dividing module are arranged in series at the output end of the driving and protection unit, and the common end of the first voltage dividing module and the second voltage dividing module is the sampling end.

[0055] For example, the first voltage dividing module is such as the sixteenth resistor R16, and the second voltage dividing module is such as the seventeenth resistor R17. The sixteenth resistor R16 and the seventeenth resistor R17 are voltage dividing sampling resistors.

[0056] Therefore, the driving signals output by the driving and protection units are collected through two voltage-dividing modules, the structure is simple, and the accuracy of the collected signals can be guaranteed.

[0057] Specifically, the first-stage operational amplifier module can be used to perform a first-stage operational amplification process on the sampling signal to obtain a first-stage operational amplification signal.

[0058] Specifically, the second-stage operational amplifier module can be used to perform second-stage operational amplification processing on the first-stage operational amplification signal to obtain a second-stage operational amplification signal as a feedback signal, so that the controller can determine the operating status of the drive and protection unit according to the feedback signal, and then the controller can remind and shut down the drive and short-circuit protection unit when the operating status of the drive and short-circuit protection unit is abnormal.

[0059] Therefore, by performing real-time detection on the operating status of the drive side, the problem that the relay cannot be normally disconnected due to a low-voltage drive side fault can be solved, thereby realizing low-voltage side drive status protection.

[0060] More optionally, the first-stage operational amplifier module and the second-stage operational amplifier module have the same structure. The first-stage operational amplifier module may include: a fifth resistor module (such as a fifteenth resistor R15), a sixth resistor module (such as a fourteenth resistor R14), a seventh resistor module (such as a thirteenth resistor R13) and a second operational amplifier module (such as a third operational amplifier U3).

[0061] The fifth resistor module is arranged between the sampling end of the sampling module and the inverting input end of the second operational amplifier module. The sixth resistor module is arranged at the non-inverting input end of the second operational amplifier module. The seventh resistor module is arranged in parallel between the inverting input end of the second operational amplifier module and the output end of the second operational amplifier module.

[0062] For example, the fifteenth resistor R15, the thirteenth resistor R13, the fourteenth resistor R14 and the third operational amplifier U3 serve as a first-stage operational amplifier.

[0063] Therefore, a first-stage operational amplifier module is formed by the fifth resistor module, the sixth resistor module, the seventh resistor module and the second operational amplifier module, which has a simple structure, a fast operational amplifier processing speed and a good effect.

[0064] Further optionally, the driving state detection unit may further include: a first filtering module (such as a third capacitor C3) and / or a second filtering module (such as a fourth capacitor C4) and / or a clamping module (such as a second diode D2).

[0065] Specifically, the first filtering module is arranged at the output end of the second stage operational amplifier module, and can be used to filter the feedback signal. And / or, the second filtering module is arranged at the input end of the sampling module, and can be used to filter the drive signal. For example, the third capacitor C3 and the fourth capacitor C4 are filter capacitors.

[0066] Therefore, by setting a filter capacitor, the filtering effect can be improved, thereby improving the accuracy of control.

[0067] Specifically, the clamping module is arranged at the inverting input terminal of the first-stage operational amplifier module and connected to the third power supply (such as the third power supply VCC3), and can be used to prevent the sampling signal from being greater than a preset value. For example, the second diode D2 is a clamping diode, and the clamping diode can prevent the DSP processor from being damaged due to excessive sampling voltage, thereby protecting the DSP processor.

[0068] In an optional example, the anti-reverse connection unit is provided at the output end of the driving and short-circuit protection unit, and can be used to provide anti-reverse connection protection for the power supply of the driving signal. For example, the anti-reverse connection unit can adopt an anti-reverse connection diode.

[0069] For example: the driving circuit of the high-voltage distribution system of electric vehicles adopts dual MOSFET protection drive and adds an anti-reverse diode at the low-voltage output end; at the same time, compared with the high-voltage side adhesion detection in some solutions, the driving circuit of the high-voltage distribution system of electric vehicles adds real-time detection of the low-voltage driving side status.

[0070] Therefore, through the coordinated setting of the driving and short-circuit protection unit, the anti-reverse connection unit, and the driving state detection unit, short-circuit protection can be achieved through the driving and short-circuit protection unit, the device can be protected when the power supply is reversed through the anti-reverse connection unit, and low-voltage side driving state protection can be achieved through the driving state detection unit, which can improve the safety of power systems such as automobile power distribution systems.

[0071] Optionally, the reverse connection prevention unit may include: a diode module (such as a first diode D1 ), wherein an anode of the diode module is connected to an end of the second voltage divider module away from the first voltage divider module, and a cathode of the diode module is grounded.

[0072] For example, the first diode D1 is a reverse connection protection diode.

[0073] Therefore, by adding an anti-reverse connection diode at the output end of the driving and protection unit, the problem of device damage caused by reverse connection of the power supply can be solved, and the device can be protected when the power supply is reversed.

[0074] In an optional embodiment, the control device of the drive circuit may further include: a controller. The controller may be used to issue a switch-on instruction when the device to be driven needs to be switched on, or to issue a switch-off instruction when the device to be driven needs to be switched off. Furthermore, the controller may determine the operating state of the drive and protection unit according to the feedback signal, and then give a reminder and switch off the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal.

[0075] Therefore, by determining the operating state of the driving and protection unit according to the feedback signal, and then giving a reminder and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal, the safety of the driving circuit can be improved.

[0076] A large number of tests have verified that the technical solution of the present invention is adopted by adopting a dual MOSFET driving protection at the input end of the low-voltage side of the driving circuit of the high-voltage distribution system of the electric vehicle, and adding an anti-reverse connection diode at the output end of the low-voltage side of the driving circuit; at the same time, the output end of the low-voltage side of the driving circuit is fed back through voltage division sampling, and the driving state of the driving circuit is detected in real time, and the fault information of the driving circuit is fed back in time, so that the low-voltage side driving part of the relay can be timely and effectively protected from reverse connection and short circuit, and the working state can be detected, the fault signal can be diagnosed, and different fault causes can be fed back in time, so as to improve the safety of the automobile distribution system.

[0077] According to an embodiment of the present invention, there is also provided an automobile power distribution system corresponding to the control device of the drive circuit. The automobile power distribution system may include: the control device of the drive circuit described above.

[0078] The power distribution system is the main component of the vehicle power system. By protecting the vehicle power distribution system and accurately feeding back fault information, the high-voltage distribution system can be guaranteed to distribute high voltage normally and ensure the safety performance of the vehicle. The vehicle control system controls the on and off (i.e., connection and shutdown) of the high-voltage DC relay to realize the connection and shutdown of the high-voltage electricity of the load in the electric vehicle (such as the main drive motor, air conditioner, DC / DC, oil pump motor, air pump motor, electric heating and electric defrosting).

[0079] As a key component of the high-voltage system of electric vehicles, relays often need to be closed (i.e. connected) and closed during long-term use. Their normal closing and closing play an important role in the safety of the entire vehicle and its personnel. However, some solutions only perform adhesion detection on the high-voltage side, lack detection and protection on the low-voltage drive side, and cannot accurately and specifically judge the fault once a fault occurs. Therefore, it is necessary to protect and detect the low-voltage drive side to ensure that when a fault occurs, the control system can accurately judge the high and low voltage faults and take corresponding measures.

[0080] In an optional embodiment, the solution of the present invention provides a solution that can be used for the protection and status detection of the drive circuit of the high-voltage power distribution system of electric vehicles, and is suitable for all working occasions of protection and detection of the low-voltage drive side of the high-voltage power distribution system in electric vehicles. The solution can timely and effectively perform anti-reverse connection and anti-short circuit protection on the low-voltage side drive part of the relay and perform working status detection, diagnose the fault signal, and timely feedback and process different fault causes. By effectively protecting the low-voltage drive part of the distribution system from reverse connection and short circuit, serious consequences such as damage to parts and system failure caused by reverse polarity of the power supply and internal short circuit of the device can be prevented; at the same time, the status of the low-voltage drive can be detected, which can effectively determine the source of the fault and reduce the workload of maintenance; and the circuit is simple and practical.

[0081] In an optional example, in the solution of the present invention, the driving circuit of the high-voltage distribution system of an electric vehicle adopts dual MOSFET driving protection, and an anti-reverse diode is added at the output end; at the same time, its driving state is detected in real time through voltage division sampling feedback, and fault information is fed back in time, which can effectively reduce the damage to the components of the driving circuit and the system failure caused by faults, increase the safety and reliability of the system, and reduce the maintenance workload.

[0082] Optionally, in the solution of the present invention, dual MOSFET driving protection is adopted to solve the problem of misleading conduction caused by short circuit of a single MOSFET, thereby achieving the effect of short circuit protection.

[0083] Optionally, in the solution of the present invention, an anti-reverse connection diode is added to the output end to solve the problem of device damage caused by reverse connection of the power supply, thereby achieving the effect of device protection.

[0084] Optionally, in the solution of the present invention, the operating status of the driving side is detected in real time, which solves the problem that the relay cannot be normally disconnected due to a low-voltage driving side fault, thereby achieving the effect of protecting the low-voltage side driving status.

[0085] In an alternative embodiment, see Figures 2 to 6 The examples shown are used to illustrate the specific implementation process of the solution of the present invention.

[0086] Figure 2 The structure diagram of an embodiment of a driving circuit of a high voltage power distribution system of an electric vehicle is shown in FIG. Figure 2 In the example shown, the driving circuit of the high-voltage distribution system of the electric vehicle adopts dual MOSFET protection drive and adds an anti-reverse diode at the low-voltage output end; at the same time, compared with the high-voltage side adhesion detection in some solutions, the driving circuit of the high-voltage distribution system of the electric vehicle adds real-time detection of the low-voltage driving side status.

[0087] like Figure 2 As shown, the driving circuit of the high-voltage power distribution system of an electric vehicle may include: a first-stage MOSFET driving circuit, a second-stage MOSFET driving circuit and a relay state detection feedback circuit.

[0088] The first end of the first-stage MOSFET driving circuit, the first end of the second-stage MOSFET driving circuit, and the first end of the relay K1 state detection feedback circuit are respectively connected to the DSP processor. The second end of the second-stage MOSFET driving circuit is respectively connected to the second end of the first-stage MOSFET driving circuit and the second end of the relay K1 state detection feedback circuit. The second end of the relay K1 state detection feedback circuit is also connected to the load through the relay K1. The relay K1 serves as a control switch on the high-voltage side.

[0089] Figure 3 FIG. 1 is a schematic diagram of a structure of an embodiment of a first-stage MOSFET driving circuit. Figure 3 As shown, the first-stage MOSFET driving circuit may include: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first operational amplifier U1, a first capacitor C1, a first optical coupler OC1 and a first MOS tube (ie, a first MOSFET).

[0090] Among them, the first end of the first resistor R1 can be used to input the first control signal V1, and the second end of the first resistor R1 is connected to the non-inverting input end of the first operational amplifier U1. The first end of the second resistor R2 is grounded, and the second end of the second resistor R2 is connected to the inverting input end of the first operational amplifier U1. The third resistor R3 and the first capacitor C1 are arranged in parallel between the inverting input end of the first operational amplifier U1 and the output end of the first operational amplifier U1. The output end of the first operational amplifier U1 is also connected to the anode of the first optical coupler isolator OC1, the cathode of the first optical coupler isolator OC1 is grounded, the collector of the first optical coupler isolator OC1 is connected to the first power supply VCC1 through the fourth resistor R4, and the emitter of the first optical coupler isolator OC1 is connected to the gate of the first MOS tube Q1. The drain of the first MOS tube Q1 is connected to the first power supply VCC1, and the source of the first MOS tube Q1 can be used to output the first output signal OUT1.

[0091] Specifically, the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1 and the first operational amplifier U1 form an operational amplifier circuit, which performs operational amplification on the output signal of the DSP processor. The first optical coupler isolator OC1 isolates the first power supply VCC1 from the DSP processor, which plays the role of isolation protection. The fourth resistor R4 serves the purpose of current limiting protection, and the first MOS tube Q1 plays the role of controlling the switch. The first capacitor C1 is a filter capacitor.

[0092] Figure 4 FIG. 1 is a schematic diagram of a structure of an embodiment of a second-stage MOSFET driving circuit. Figure 4 As shown, the second-stage MOSFET driving circuit may include: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second operational amplifier U2, a second capacitor C2, a second optical coupler OC2 and a second MOS tube (ie, a second MOSFET).

[0093] Among them, the first end of the fifth resistor R5 can be used to input the second control signal V2, and the second end of the fifth resistor R5 is connected to the non-inverting input terminal of the second operational amplifier U2. The first end of the sixth resistor R6 is grounded, and the second end of the sixth resistor R6 is connected to the inverting input terminal of the second operational amplifier U2. The seventh resistor R7 and the second capacitor C2 are arranged in parallel between the inverting input terminal of the second operational amplifier U2 and the output terminal of the second operational amplifier U2. The output terminal of the second operational amplifier U2 is also connected to the anode of the second optical coupler isolator OC2, the cathode of the second optical coupler isolator OC2 is grounded, the collector of the second optical coupler isolator OC2 is connected to the second power supply VCC2 through the eighth resistor R8, and the emitter of the second optical coupler isolator OC2 is connected to the gate of the second MOS tube Q2. The drain of the second MOS tube Q2 is connected to the second power supply VCC2, and the source of the second MOS tube Q2 can be used to output the second output signal OUT2.

[0094] Specifically, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the second capacitor C2 and the second operational amplifier U2 form an operational amplifier circuit, which plays a role in operationally amplifying the output signal of the DSP processor. The second optical coupler isolator OC2 isolates the second power supply VCC2 from the DSP processor to play a role in isolation protection. The eighth resistor R8 serves the purpose of current limiting protection, and the second MOS tube Q2 plays the role of a control switch. The second capacitor C2 is a filter capacitor.

[0095] Figure 5 FIG. 1 is a schematic diagram of a structure of an embodiment of a relay state detection feedback circuit. Figure 5 As shown, the relay state detection feedback circuit may include: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a third capacitor C3, a fourth capacitor C4, a third operational amplifier U3, a fourth operational amplifier U4, a first diode D1 and a second diode D2.

[0096] Among them, after the sixteenth resistor R16 and the seventeenth resistor R17 are connected in series, they are connected in parallel with the fourth capacitor C4 to form a parallel branch. The first end of the parallel branch is connected to the first end of the coil of the relay K1, and is also connected to the output end of the second output signal OUT2; the second end of the parallel branch is connected to the second end of the coil of the relay K1, and is also connected to the anode of the first diode D1, and the cathode of the first diode D1 is grounded. The common end of the sixteenth resistor R16 and the seventeenth resistor R17 is connected to the inverting input end of the third operational amplifier U3 after the fifteenth resistor R15, and the in-phase input end of the third operational amplifier U3 is grounded through the fourteenth resistor R14. The second diode D2 is a diode group arranged in series, and the inverting input end of the third operational amplifier U3 is also connected to the common end of the diode group (i.e., the common end of the two diodes arranged in series), the anode of the diode group is grounded, and the cathode of the diode group is connected to the third power supply VCC3. The thirteenth resistor R13 is arranged in parallel between the inverting input end of the third operational amplifier U3 and the output end of the third operational amplifier U3. The output terminal of the third operational amplifier U3 is connected to the inverting input terminal of the fourth operational amplifier U4 through the twelfth resistor R12. The non-inverting input terminal of the fourth operational amplifier U4 is grounded through the eleventh resistor R11. The tenth resistor R10 is connected in parallel between the inverting input terminal of the fourth operational amplifier U4 and the output terminal of the fourth operational amplifier U4. The output terminal of the fourth operational amplifier U4 is connected to the output terminal of the feedback signal V3 through the ninth resistor R9. The feedback terminal of the feedback signal V3 is also grounded through the third capacitor C3.

[0097] Specifically, the sixteenth resistor R16 and the seventeenth resistor R17 are voltage-dividing sampling resistors. The fifteenth resistor R15, the thirteenth resistor R13, the fourteenth resistor R14 and the third operational amplifier U3 serve as a primary operational amplifier, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the fourth operational amplifier U4 serve as a secondary operational amplifier, and the third capacitor C3 and the fourth capacitor C4 are filter capacitors. The first diode D1 is an anti-reverse diode, and the second diode D2 is a clamping diode, which prevents the DSP processor from being damaged due to excessive sampling voltage, and plays a role in protecting the DSP processor.

[0098] For example: D1 is a reverse connection protection diode. When the positive and negative poles of the power supply are reversed, due to the forward conduction principle of the diode, it can effectively prevent the reverse connection circuit from being turned on and prevent damage to the device. D2 is a clamping diode, and can clamp the feedback signal V3 between VCC3 and GND to meet the DSP receiving voltage range, prevent excessive voltage or negative voltage from damaging the DSP, and play a role in protecting the DSP.

[0099] Figure 6 The driving process diagram of an embodiment of a driving circuit of a high voltage power distribution system of an electric vehicle is shown in FIG. Figure 6As shown, the driving process of the driving circuit of the high-voltage power distribution system of an electric vehicle may include:

[0100] Step 10: The controller (such as a DSP processor) issues a control instruction and performs instruction judgment: if it is a closing instruction, execute steps 20 to 21; if it is a closing instruction, execute step 30.

[0101] Step 20: When a closing instruction is given, the first control signal V1 and the second control signal V2 output a high level to drive the first MOS transistor Q1 and the second MOS transistor Q2 to operate.

[0102] Specifically, the DSP simultaneously outputs a high-level first control signal V1 and a second control signal V2. The first control signal V1 is processed by the first operational amplifier U1, and then drives the first MOS tube Q1 to work through the first optical coupler isolator OC1. Figure 3 As shown; the second control signal V2 is processed by the second operational amplifier U2, and then drives the second MOS tube Q2 to work through the second optical coupler isolator OC2, as shown Figure 4 shown.

[0103] Step 21, the DSP processor determines whether the feedback signal V3 is at a high level. If the feedback signal V3 is at a high level, the drive is completed and the relay K1 is closed; if the feedback signal V3 is not at a high level, a fault alarm is initiated to indicate that the drive is abnormal.

[0104] Specifically, the relay state detection feedback circuit performs voltage division feedback on the driving voltage output by the second output signal OUT2, collects the voltage at point A after voltage division, and feeds back to the DSP after being processed by the third operational amplifier U3 and the fourth operational amplifier U4. Figure 5 If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) received by the DSP processor is at a high level, it is judged that the driving circuit has completed normal driving; if the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) received by the DSP processor is at a low level, it is judged that the driving is abnormal and a low-voltage side driving fault alarm is issued.

[0105] Step 30: When a shutdown instruction is given: the first control signal V1 is at a high level, the second control signal V2 is at a low level, the first MOS tube Q1 is turned on, and the second MOS tube Q2 is turned off.

[0106] Specifically, the first control signal V1 remains at a high level, the first MOS tube Q1 remains in an on state after being driven by the first operational amplifier U1 and the first optical coupler isolator OC1, and the first output signal OUT1 is at a high level such as the first power supply VCC1; the second control signal V2 becomes a low level, the second MOS tube Q2 is cut off without a driving signal, and the second output signal OUT2 should be a low level at this time.

[0107] Step 31, the DSP processor determines whether the feedback signal V3 is at a low level. If the feedback signal V3 is at a low level, the driving ends; if the feedback signal V3 is not at a low level, an alarm is initiated to indicate that the shutdown instruction cannot be completed.

[0108] Specifically, the voltage at point A after the voltage division of the second output signal OUT2 is sampled and processed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is at a low level, it can be determined that the drive shutdown instruction is completed; if the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is at a high level, it is determined that the drive part has not completed the shutdown instruction, the secondary MOSFET drive fails, and the next step is executed.

[0109] The first control signal V1 is controlled to output a low level, and the first MOS tube Q1 is cut off without a driving signal. Then, the voltage at point A after the voltage division of the second output signal OUT2 is sampled and processed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is a low level, it can be judged that the driving shutdown instruction is completed; if the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is a high level, it is judged that the driving part has not completed the shutdown instruction, the first-level MOSFET driver fails, and the shutdown instruction cannot be completed, and a low-voltage side shutdown fault alarm is issued.

[0110] Since the processing and functions implemented by the automobile power distribution system of this embodiment are basically corresponding to the aforementioned Figure 1 The embodiments, principles and examples of the device shown are as follows. Therefore, for matters not fully described in the description of this embodiment, reference can be made to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be given here.

[0111] After a large number of tests and verifications, the technical solution of the present invention is adopted, by adopting dual MOSFET driving protection at the input end of the low-voltage side of the driving circuit of the high-voltage distribution system of the electric vehicle, and adding an anti-reverse connection diode at the output end of the low-voltage side of the driving circuit; at the same time, the output end of the low-voltage side of the driving circuit is fed back by voltage division sampling, the driving state of the driving circuit is detected in real time, and the fault information of the driving circuit is fed back in time. By effectively protecting the low-voltage driving part of the distribution system from reverse connection and short circuit, serious consequences such as damage to parts and system failure caused by reverse polarity of the power supply and internal short circuit of the device can be prevented; at the same time, the state of the low-voltage drive is detected, the source of the fault can be effectively determined, and the maintenance workload is reduced; and the circuit is simple and practical.

[0112] According to an embodiment of the present invention, a control method for a driving circuit of an automobile power distribution system corresponding to the automobile power distribution system is also provided. Figure 7 The flowchart of an embodiment of the method of the present invention is shown in FIG. The control method of the driving circuit of the automobile power distribution system may include: steps S110 to S130.

[0113] At step S110, when the device to be driven needs to be turned on, a turn-on instruction is issued. Or when the device to be driven needs to be turned off, a turn-off instruction is issued. For example, a controller (such as a DSP processor) issues a control instruction, performs instruction judgment, and executes different control strategies according to the instruction judgment result.

[0114] At step S120, if the connection instruction is received, the operating state of the driving and short-circuit protection unit is determined based on the driving signal in a first control mode, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal.

[0115] Optionally, in step S120, the operating status of the driving and short-circuit protection unit is determined based on the driving signal in a first control manner, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating status of the driving and short-circuit protection unit is abnormal. For the specific process, please refer to the following exemplary description.

[0116] Combine the following Figure 8 The method of the present invention is shown as a flow chart of an embodiment of reminding and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal according to the first control mode, further illustrating the specific process of reminding and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal according to the first control mode in step S120, which may include: steps S210 to S240.

[0117] Step S210, according to the switch-on instruction, control the first control signal and the second control signal to output a first set level (such as a high level), drive the first switch tube and the second switch tube to be switched on and work, and detect the feedback signal (such as feedback signal V3).

[0118] For example, when a closing instruction is given, the first control signal V1 and the second control signal V2 output high levels, driving the first MOS tube Q1 and the second MOS tube Q2 to work. Specifically, the DSP simultaneously outputs the first control signal V1 and the second control signal V2 of high level, the first control signal V1 is processed by the first operational amplifier U1, and then drives the first MOS tube Q1 to work through the first optical coupler isolator OC1; the second control signal V2 is processed by the second operational amplifier U2, and then drives the second MOS tube Q2 to work through the second optical coupler isolator OC2.

[0119] Step S220, determining whether the feedback signal is at a first set level (eg, a high level).

[0120] Step S230: If the feedback signal is at the first set level, it is determined that the operation state of the driving and protection unit is normal, and the device to be driven is controlled to be turned on and run.

[0121] Step S240: If the feedback signal is not the first set level, it is determined that the operating state of the driving and protection unit is an abnormal state, and a first reminder message is sent that the driving and protection unit is abnormal and cannot be driven normally.

[0122] For example: the DSP processor determines whether the feedback signal V3 is at a high level. If the feedback signal V3 is at a high level, the drive is completed and the relay K1 is closed; if the feedback signal V3 is not at a high level, a fault alarm is initiated to indicate that the drive is abnormal. Specifically, the relay state detection feedback circuit performs voltage division feedback on the drive voltage output by the second output signal OUT2, collects the voltage at point A after voltage division, and feeds it back to the DSP after being processed by the third operational amplifier U3 and the fourth operational amplifier U4. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) received by the DSP processor is at a high level, it is determined that the drive circuit has completed normal drive; if the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) received by the DSP processor is at a low level, it is determined that the drive is abnormal and a low-voltage side drive fault alarm is issued.

[0123] Therefore, by determining the operating status of the driving and short-circuit protection unit based on the driving signal in accordance with the first control method when a connection instruction is received, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating status of the driving and short-circuit protection unit is abnormal, the safety of the driving circuit under connection control can be improved.

[0124] At step S130, if the shutdown instruction is received, the operating state of the driving and short-circuit protection unit is determined based on the driving signal according to the second control method, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal.

[0125] Therefore, by determining the operating state of the driving and protection unit according to the feedback signal, and then giving a reminder and shutting down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal, the safety of the driving circuit can be improved.

[0126] Optionally, in step S130, the operating status of the driving and short-circuit protection unit is determined based on the driving signal according to the second control mode, so as to give a reminder and shut down the driving and short-circuit protection unit when the operating status of the driving and short-circuit protection unit is abnormal. For the specific process, please refer to the following exemplary description.

[0127] Combine the following Fig. 9The method of the present invention is shown as a flow chart of an embodiment of reminding and shutting down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal according to the second control mode, further illustrating the process of reminding and shutting down the drive and short-circuit protection unit when the operating state of the drive and short-circuit protection unit is abnormal according to the second control mode in step S130, which may include: steps S310 to S340.

[0128] Step S310, according to the shutdown instruction, control the first control signal to output a first set level (such as a high level), and control the second control signal to output a second set level (such as a low level), drive the first switch tube to turn on and work, and control the second switch tube to turn off, and detect the feedback signal (such as feedback signal V3).

[0129] For example, when a shutdown instruction is given: the first control signal V1 is at a high level, the second control signal V2 is at a low level, the first MOS tube Q1 is turned on, and the second MOS tube Q2 is turned off. Specifically, the first control signal V1 remains at a high level, the first MOS tube Q1 is still in a conducting state after being driven by the first operational amplifier U1 and the first optical coupler isolator OC1, and the first output signal OUT1 is at a high level such as the first power supply VCC1; the second control signal V2 becomes a low level, the second MOS tube Q2 is cut off without a driving signal, and the second output signal OUT2 should be at a low level.

[0130] Step S320, determining whether the feedback signal is at a second set level (eg, a low level).

[0131] Step S330: If the feedback signal is the second set level, determine that the operating state of the second switch tube in the driving and protection unit is a normal state, and control the device to be driven to be turned off.

[0132] Step S340: if the feedback signal is not the second set level, determining that the operating state of the second switch tube in the driving and protection unit is an abnormal state, and determining whether the operating state of the first switch tube in the driving and protection unit is a normal state.

[0133] For example, the voltage at point A after the voltage division of the second output signal OUT2 is sampled and processed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is at a low level, it can be determined that the driver shutdown instruction is completed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is at a high level, it is determined that the driver part has not completed the shutdown instruction, the secondary MOSFET driver fails, and the next step is executed.

[0134] Therefore, by determining the operating state of the second switch tube in the drive and short-circuit protection unit based on the drive signal according to the second control method when a shutdown instruction is received, the fault state can be discovered in time when the second switch tube is abnormal, making fault determination convenient and quick.

[0135] More optionally, it can be combined with Fig.10 The flowchart of an embodiment of determining whether the operating state of the first switch tube in the driving and protection unit is a normal state in the method of the present invention is shown, which further illustrates the specific process of determining whether the operating state of the first switch tube in the driving and protection unit is a normal state in step S340, and may include: step S410 to step S440.

[0136] Step S410, controlling the first control signal to output the second set level (such as a low level), controlling the first switch tube to be turned off, and detecting the feedback signal (such as the feedback signal V3) again.

[0137] Step S420, determining whether the feedback signal detected again is at a second set level (eg, a low level).

[0138] Step S430: If the feedback signal detected again is the second set level, it is determined that the operating state of the first switch tube in the driving and protection unit is a normal state, and the device to be driven is controlled to be turned off.

[0139] Step S440, if the feedback signal detected again is not the second set level, it is determined that the operating state of the first switch tube in the driving and protection unit is abnormal, and a second reminder message is initiated that the driving and protection unit is abnormal and cannot be shut down normally.

[0140] For example: the first control signal V1 is controlled to output a low level, and the first MOS tube Q1 is cut off without a driving signal. Then, the voltage at point A after the voltage division of the second output signal OUT2 is sampled and processed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is a low level, it can be judged that the driving shutdown instruction is completed. If the feedback signal V3 (such as feedback voltage, sampling voltage, etc.) is a high level, it is judged that the driving part has not completed the shutdown instruction, the first-level MOSFET driver fails, and the shutdown instruction cannot be completed, and a low-voltage side shutdown fault alarm is issued.

[0141] Therefore, by determining the operating state of the second switch tube in the drive and short-circuit protection unit based on the drive signal according to the second control method when a shutdown instruction is received, the fault state can be discovered in time when the second switch tube is abnormal, and it can be further determined whether the first switch tube is faulty, so that when the operating state of the first switch tube is also abnormal, a reminder can be given and the drive and short-circuit protection unit can be shut down, thereby improving the safety of the drive circuit under shutdown control.

[0142] Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned automobile power distribution system, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0143] After a large number of tests and verifications, the technical solution of this embodiment is adopted, by adopting dual MOSFET drive protection at the input end of the low-voltage side of the drive circuit of the high-voltage distribution system of the electric vehicle, and adding an anti-reverse connection diode at the output end of the low-voltage side of the drive circuit; at the same time, the output end of the low-voltage side of the drive circuit is fed back through voltage division sampling to perform real-time detection of the drive state of the drive circuit, and timely feedback of the fault information of the drive circuit, which can effectively reduce the damage to the components of the drive circuit and the system failure caused by the fault, increase the safety and reliability of the system, and reduce the maintenance workload.

[0144] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0145] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control device for a drive circuit, characterized in that: include: The drive and short circuit protection unit also includes: a drive state detection unit and / or an anti-reverse connection unit; wherein, The driving and short-circuit protection unit is used to provide a driving signal for the device to be driven and can realize short-circuit protection; the driving and short-circuit protection unit includes: a first-level driving and protection circuit and a second-level driving and protection circuit; wherein the input end of the first-level driving and protection circuit is used to receive a first control signal; the output end of the first-level driving and protection circuit is output to the second input end of the second-level driving and protection circuit; the first input end of the second-level driving and protection circuit is used to receive a second control signal; the output end of the second-level driving and protection circuit is used to output the driving signal to the driving end of the device to be driven; The driving state detection unit is used to determine the operating state of the driving and short-circuit protection unit based on the driving signal, so as to remind and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal; The anti-reverse connection unit is used to perform anti-reverse connection protection on the power supply of the driving signal; by adopting dual MOSFET driving protection at the input end of the low-voltage side of the driving circuit of the high-voltage distribution system of the electric vehicle, and adding an anti-reverse connection diode at the output end of the low-voltage side of the driving circuit; at the same time, by sampling the output end of the low-voltage side of the feedback driving circuit through voltage division, the driving state of the driving circuit is detected in real time, and the fault information of the driving circuit is fed back in time.

2. The control device of the drive circuit according to claim 1, characterized in that: The first-stage driving and protection circuit and the second-stage driving and protection circuit have the same structure; wherein, The first-stage driving and protection circuit includes: a first operational amplifier module, a first isolation module, a first current limiting module and a first switch tube; The first operational amplifier module is used to perform operational amplification processing on the first control signal to obtain a first processed signal; The first isolation module is used to perform isolation protection between the first processed signal and the first power supply to obtain a first isolated signal; The first current limiting module is used to perform current limiting protection on the power supply end of the first isolation module; The first switch tube is used to use the first power supply as the power supply and the first isolation signal as the control signal to output a first switch signal, and the first switch signal is output to the second input end of the second-stage driving and protection circuit.

3. The control device of the drive circuit according to claim 2, characterized in that: The first operational amplifier module includes: a first resistor module, a second resistor module, a third resistor module, a first capacitor module and a first operational amplifier module; wherein, The first resistor module is arranged at the non-inverting input terminal of the first operational amplifier module, and is used to receive the first control signal; the second resistor module is arranged at the inverting input terminal of the operational amplifier module; the third resistor module and the first capacitor module are arranged in parallel between the inverting input terminal of the first operational amplifier module and the output terminal of the first operational amplifier module.

4. The control device of the drive circuit according to any one of claims 1 to 3, characterized in that: The driving state detection unit includes: a sampling module, a first-stage operational amplifier module and a second-stage operational amplifier module; wherein, The sampling module is used to collect the driving signal output by the driving and protection unit to obtain a sampling signal; The first-stage operational amplifier module is used to perform a first-stage operational amplification process on the sampled signal to obtain a first-stage operational amplification signal; The second-stage operational amplifier module is used to perform second-stage operational amplification processing on the first-stage operational amplification signal to obtain a second-stage operational amplification signal as a feedback signal, so as to determine the operating status of the driving and protection unit according to the feedback signal, and then to remind and shut down the driving and short-circuit protection unit when the operating status of the driving and short-circuit protection unit is abnormal.

5. The control device for the drive circuit according to claim 4, characterized in that: The driving state detection unit further includes: a first filtering module and / or a second filtering module and / or a clamping module; wherein, The first filtering module is arranged at the output end of the second stage operational amplifier module, and is used to filter the feedback signal; and / or, The second filtering module is arranged at the input end of the sampling module, and is used to filter the driving signal; and / or, The clamping module is arranged at the inverting input terminal of the first-stage operational amplifier module and connected to the third power supply, and is used to prevent the sampling signal from being greater than a preset value.

6. The control device for the drive circuit according to claim 4, characterized in that: The sampling module includes: a first voltage dividing module and a second voltage dividing module; the first voltage dividing module and the second voltage dividing module are arranged in series at the output end of the driving and protection unit, and the common end of the first voltage dividing module and the second voltage dividing module is the sampling end.

7. The control device of the drive circuit according to claim 4, characterized in that: The structures of the first-stage operational amplifier module and the second-stage operational amplifier module are the same; wherein, The first-stage operational amplifier module includes: a fifth resistor module, a sixth resistor module, a seventh resistor module and a second operational amplifier module; wherein, The fifth resistor module is arranged between the sampling end of the sampling module and the inverting input end of the second operational amplifier module; the sixth resistor module is arranged at the non-inverting input end of the second operational amplifier module; the seventh resistor module is arranged in parallel between the inverting input end of the second operational amplifier module and the output end of the second operational amplifier module.

8. The control device of the drive circuit according to claim 6, characterized in that: The anti-reverse connection unit comprises: a diode module; an anode of the diode module is connected to an end of the second voltage divider module away from the first voltage divider module.

9. An automobile power distribution system, characterized in that: include: A control device for a drive circuit as claimed in any one of claims 1 to 8.

10. A control method for a driving circuit of an automobile power distribution system as claimed in claim 9, characterized in that: include: When the device to be driven needs to be turned on, a turn-on command is issued; or when the device to be driven needs to be turned off, a turn-off command is issued; If the switch-on instruction is received, the operation state of the drive and short-circuit protection unit is determined based on the drive signal in a first control mode, so as to remind and shut down the drive and short-circuit protection unit when the operation state of the drive and short-circuit protection unit is abnormal, including: according to the switch-on instruction, the first control signal and the second control signal are controlled to output the first set level, drive the first switch tube and the second switch tube to be turned on and work, and detect the feedback signal; determine whether the feedback signal is the first set level; if the feedback signal is the first set level, determine that the operation state of the drive and protection unit is normal, and control the device to be driven to be turned on and run; if the feedback signal is not the first set level, determine that the operation state of the drive and protection unit is abnormal, and initiate a first reminder message that the drive and protection unit is abnormal and cannot be driven normally; If the shutdown instruction is received, the operating state of the driving and short-circuit protection unit is determined based on the driving signal according to the second control mode, so as to remind and shut down the driving and short-circuit protection unit when the operating state of the driving and short-circuit protection unit is abnormal, including: according to the shutdown instruction, controlling the first control signal to output the first set level, and controlling the second control signal to output the second set level, driving the first switch tube to turn on and work, and controlling the second switch tube to turn off, and detecting the feedback signal; determining whether the feedback signal is the second set level; if the feedback signal is the second set level, determining that the operating state of the second switch tube in the driving and protection unit is normal, and controlling the device to be driven to be turned off; if the feedback signal is not the second set level, determining that the operating state of the second switch tube in the driving and protection unit is abnormal, and determining whether the operating state of the first switch tube in the driving and protection unit is normal.

11. The control method of the driving circuit of the automobile power distribution system according to claim 10, characterized in that: Determining whether the operation state of the first switch tube in the driving and protection unit is normal includes: Controlling the first control signal to output the second set level, controlling the first switch tube to turn off, and detecting the feedback signal again; determining whether the feedback signal detected again is at a second set level; If the feedback signal detected again is the second set level, determining that the operating state of the first switch tube in the driving and protection unit is a normal state, and controlling the device to be driven to be turned off; If the feedback signal detected again is not the second set level, it is determined that the operating state of the first switch tube in the driving and protection unit is abnormal, and a second reminder message is initiated that the driving and protection unit is abnormal and cannot be shut down normally.

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