CN117878862A - Reverse polarity protection circuit, control method thereof, electric oil pump and vehicle device - Google Patents
Reverse polarity protection circuit, control method thereof, electric oil pump and vehicle device Download PDFInfo
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Abstract
The application relates to a reverse polarity protection circuit, a control method thereof, an electric oil pump and vehicle equipment. The electric oil pump includes a motor and a motor controller, and the reverse polarity protection circuit includes: a fuse, a unidirectional conduction module, and a switch module configured to: when the motor controller works in the normal working mode, receiving a first level from the motor controller to prevent current flowing from the first end of the switch module to the second end of the switch module, so that working current of the motor is supplied to the motor through the first end and the second end of the fuse; when the motor controller is operating in the fuse emergency mode of operation, a second level is received from the motor controller to allow current to flow from the first end to the second end of the switch module such that an operating current of the motor is supplied to the motor through the first and second ends of the switch module. The reverse polarity protection circuit can provide a reverse polarity protection function with low power consumption for an electric oil pump, a vehicle and related products.
Description
Technical Field
The application relates to the technical field of new energy automobiles, in particular to a reverse polarity protection circuit, a control method thereof, an electric oil pump and vehicle equipment.
Background
Electric oil pumps are often required to be provided in the power and transmission systems of new energy vehicles. The electric oil pump is a combination comprising an oil pump, a motor controller and embedded software thereof, wherein the motor controller controls the motor, drives the oil pump as a power source to provide hydraulic oil for cooling, lubricating and driving a gear shifting executing mechanism, and builds pressure for a clutch to be used for transmitting torque.
In the whole vehicle production or after-sales maintenance process, sometimes the problem of reversely connecting the power line of the vehicle (namely, the problem that the positive electrode line is connected to the negative electrode terminal and the negative electrode line is connected to the positive electrode terminal) due to the wrong operation occurs, and at this time, the power system of the vehicle can bear reverse voltage, so that the damage of internal components is easy to cause, and the vehicle fault and the safety problem can be caused.
Disclosure of Invention
The application provides a reverse polarity protection circuit, a control method thereof, a motor controller and an electric oil pump, and the reverse polarity protection circuit can provide a reverse polarity protection function with low power consumption for the electric oil pump, a vehicle and related products.
According to the present application, there is provided a reverse polarity protection circuit of an electric oil pump including a motor and a motor controller, the reverse polarity protection circuit including:
the first end of the fuse is connected with the positive power supply access end of the electric oil pump, and the second end of the fuse is connected with the positive power supply end of the motor;
the unidirectional conduction module, the first end of unidirectional conduction module is connected the second end of fuse, the second end of unidirectional conduction module is connected respectively the negative pole power access end of electric oil pump with the negative power end of motor, unidirectional conduction module is configured as: preventing current flow from the first end of the unidirectional conduction module to the second end of the unidirectional conduction module and allowing current flow from the second end of the unidirectional conduction module to the first end of the unidirectional conduction module;
the first end of the switch module is connected with the positive power supply access end of the electric oil pump, the second end of the switch module is connected with the positive power supply end of the motor, the control end of the switch module is connected with the signal output end of the motor controller, and the switch module is configured to:
when the motor controller is operated in a normal operation mode, receiving a first level from the motor controller through the control terminal to block a current flowing from the first terminal of the switching module to the second terminal of the switching module, so that an operation current of the motor is supplied to the motor through the first terminal and the second terminal of the fuse;
when the motor controller is operating in a fuse emergency mode of operation, a second level from the motor controller is received by the control terminal to allow current to flow from the first end to the second end of the switch module such that an operating current of the motor is supplied to the motor through the first and second ends of the switch module.
In some possible implementations, the reverse polarity protection circuit further includes a temperature sensor disposed proximate the switch module, the temperature sensor connected to the signal input of the motor controller, the switch module further configured to: when the motor controller operates in a fuse emergency operation mode and the motor controller determines that a temperature near the switching module reaches a temperature threshold based on a temperature sensing signal received through the temperature sensor, a first level from the motor controller is received through the control terminal to cut off an operation current supplied to the motor.
In some possible implementations, the switching module includes a first transistor, the first transistor is a p-channel metal oxide semiconductor field effect transistor, a gate of the first transistor is connected to a control terminal of the switching module, a drain of the first transistor is connected to a first terminal of the switching module, a source of the first transistor is connected to a second terminal of the switching module, and a threshold voltage of a body diode of the first transistor is greater than a product between a maximum operating current of the motor and a resistance of the fuse.
In some possible implementations, the reverse polarity protection circuit further includes an operational amplifier, and the signal output of the motor controller is further connected to the control terminal of the switching module through an input terminal and an output terminal of the operational amplifier.
In some possible implementations, the unidirectional conduction module includes a transient voltage suppression diode and a first capacitance; the first end of the unidirectional conduction module is respectively connected with the cathode of the transient voltage suppression diode and the first end of the first capacitor, and the second end of the unidirectional conduction module is respectively connected with the anode of the transient voltage suppression diode and the second end of the first capacitor.
According to the present application, there is also provided a control method of a reverse polarity protection circuit, the method being performed by a motor controller of any one of the above, the method comprising:
when the motor controller works in a normal working mode, the motor controller provides the first level to the switch module through the signal output end so that the switch module stops current flowing from the first end of the switch module to the second end of the switch module, and working current of the motor is supplied to the motor through the first end and the second end of the fuse;
when the motor controller detects that the fuse is fused and the power supply voltage between the positive power supply access end and the negative power supply access end of the electric oil pump is normal, the motor controller provides the second level to the switch module through the signal output end so that the switch module allows current flowing from the first end to the second end of the switch module, and working current of the motor is supplied to the motor through the first end and the second end of the switch module.
In some possible implementations, the reverse polarity protection circuit further includes a temperature sensor disposed proximate the switch module, the temperature sensor being connected to a signal input of the motor controller, the method further comprising: when the motor controller operates in a fusing emergency operation mode and the motor controller determines that the temperature near the switch module reaches a temperature threshold based on a temperature sensing signal received through the temperature sensor, the motor controller supplies the first level to the switch module through the signal output terminal to cause the switch module to cut off an operation current supplied to the motor.
According to the present application, there is also provided a motor controller including: a processor; a memory for storing executable instructions of the processor; the processor is configured to execute the executable instruction to implement any one of the control methods of the polarity reversing protection circuit.
According to the application, there is also provided an electric oil pump comprising a motor, a motor controller and any one of the above reverse polarity protection circuits.
According to the present application, there is also provided a vehicle apparatus including any one of the above electric oil pumps.
When the power line is connected correctly, the reverse polarity protection circuit can utilize the unidirectional conduction module and the switch module which are in the 'off' (no current passing) state to enable working current to be provided for the motor only through the fuse, so that no power consumption can be generated in the normal working state; when the power lines are reversely connected, the reverse polarity protection circuit can form a fusing loop with two ends of the fuse directly connected between the two power lines by using the unidirectional conduction module in an on state (current passes through) and the switch module in an off state, so that the fuse is fused quickly, and the reverse polarity protection function is realized; when the power line is connected correctly after the fuse is fused, the reverse polarity protection circuit can temporarily replace the fuse by using the switch module in the on state under the control of the motor controller, and provide working current supply under emergency condition for the motor. Therefore, the reverse polarity protection circuit can realize double reverse polarity protection functions based on a relatively simple circuit structure, hardly generates any power consumption in a normal working state, and is beneficial to improving the safety and reliability of an electric oil pump, a vehicle and related products.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is an application scenario schematic diagram of a reverse polarity protection circuit provided in an embodiment of the present application;
fig. 2 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when the electric oil pump works normally;
fig. 3 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when a power line of an electric oil pump is reversely connected;
fig. 4 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when the electric oil pump is in a fusing emergency working mode;
fig. 5 is a schematic circuit diagram of an electric oil pump according to an embodiment of the present application;
fig. 6 is a schematic step flow diagram of a control method of a reverse polarity protection circuit according to an embodiment of the present application;
fig. 7 is a block diagram of a motor controller according to an embodiment of the present application;
fig. 8 is a block diagram of a vehicle apparatus according to an embodiment of the present application.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
The terminology used in the description of the embodiments of the disclosure is for the purpose of describing the embodiments of the disclosure only and is not intended to be limiting of the disclosure. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.
Fig. 1 is an application scenario schematic diagram of a reverse polarity protection circuit provided in an embodiment of the present application. The reverse polarity protection circuit is applied to an electric oil pump of a vehicle device. Referring to fig. 1, the electric oil pump includes a motor 10, a motor controller 20, a motor driving circuit 30, and a reverse polarity protection circuit 40, wherein the reverse polarity protection circuit 40 includes a fuse 41, a unidirectional conduction module 42, and a switching module 43.
Referring to fig. 1, the electric oil pump has a positive power supply connection terminal V1 and a negative power supply connection terminal V0 for connecting a positive power supply line and a negative power supply line, respectively. In the reverse polarity protection circuit 40, a first end (left end in fig. 1) of the fuse 41 is connected to the positive power supply terminal V1 of the electric oil pump, and a second end (right end in fig. 1) of the fuse 41 is connected to the positive power supply terminal Q1 of the motor 10. The first end (right end in fig. 1) of the unidirectional conduction module 42 is connected to the second end of the fuse, the second end (left end in fig. 1) of the unidirectional conduction module 42 is connected to the negative power supply access terminal V0 of the electric oil pump, and the second end of the unidirectional conduction module 42 is used to connect to the negative power supply terminal Q0 of the motor 10. The unidirectional conduction module 42 is configured to: preventing current flow from the first end to the second end of unidirectional conduction module 42 and allowing current flow from the second end to the first end of unidirectional conduction module 42. A first end (left end in fig. 1) of the switch module 43 is connected to the positive power supply access terminal V1 of the electric oil pump, a second end (right end in fig. 1) of the switch module 43 is connected to the positive power supply terminal Q1 of the motor, and a control end (upper end in fig. 1) of the switch module 43 is connected to the signal output terminal S1 of the motor controller 20. The switch module 43 is configured to: when the motor controller 20 operates in the normal operation mode, a first level from the motor controller 20 is received through the control terminal to block a current flowing from the first terminal of the switching module 43 to the second terminal of the switching module 43, so that an operation current of the motor 10 is supplied to the motor 10 through the first terminal and the second terminal of the fuse 41; when the motor controller 20 operates in the fuse emergency operation mode, a second level from the motor controller 20 is received through the control terminal to allow current to flow from the first end to the second end of the switch module 43 such that an operation current of the motor 10 is supplied to the motor 10 through the first and second ends of the switch module 43.
Fig. 2 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when the electric oil pump works normally. Referring to fig. 1 and 2, when the electric oil pump is operating normally, the positive power supply access terminal V1 to which the positive power supply line is connected to the positive power supply terminal Q1 of the motor 10 through both ends of the fuse 41, the positive input terminal (upper left end in fig. 1) of the motor drive circuit 30, and the positive output terminal (upper right end in fig. 1) of the motor drive circuit 30 in this order, and the negative power supply access terminal V0 to which the negative power supply line is connected to the negative power supply terminal Q0 of the motor 10 through the negative input terminal (lower left end in fig. 1) of the motor drive circuit 30 and the negative output terminal (lower right end in fig. 1) of the motor drive circuit 30. In addition, the control end of the motor driving circuit 30 is connected to the motor control end S2 of the motor controller, so that the motor driving circuit 30 can drive the motor 10 with the power supply voltage between the positive power supply access end V1 and the negative power supply access end V0 under the control of the motor controller. At this time, the motor controller 20 supplies the first level to the control terminal of the switching module 43 through the signal output terminal S1, so that the switching module 43 in the reverse polarity protection circuit 40 is in the "off" state (the state where no current passes, the line portion where no current passes is indicated by a broken line in the drawing), and the unidirectional conduction module 42 in the reverse polarity protection circuit 40 is also in the "off state (because the potential of the first terminal is higher than the potential of the second terminal thereof, the current flowing from the first terminal to the second terminal is blocked by the unidirectional conduction module 42), so that only the operation current of the motor 10 passes between the two terminals of the fuse 41 in the reverse polarity protection circuit 40 (the conduction path of the operation current of the motor 10 is indicated by a bold solid line, the current direction is indicated by an arrow), and the entire reverse polarity protection circuit 40 is equivalent to one wire in the operation current loop of the motor 10, so that the operation of other circuit components is not affected, and the power loss generated by the reverse polarity protection circuit 40 is negligible.
Fig. 3 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when a power line of an electric oil pump is reversely connected. Referring to fig. 3, when the power line of the electric oil pump is connected reversely, since the voltage at the first end of the unidirectional conduction module 42 is the negative power voltage at the positive power connection terminal V1, the voltage at the second end of the unidirectional conduction module 42 is the positive power voltage at the negative power connection terminal V0, the potential of the first end of the unidirectional conduction module 42 is lower than that of the second end thereof, the unidirectional conduction module 42 is turned from the "off state to the" on "state (state with current passing), so that the fuse 41 with extremely small resistance value and the unidirectional conduction module 42 short-circuit the positive power connection terminal V1 and the negative power connection terminal V0 together, thereby forming a short-circuit current (indicated by the bold solid line and the arrow in fig. 3), triggering the fuse protection of the fuse 41, disconnecting the first end and the second end of the fuse 41 within an extremely short time when the power line is connected reversely, and making the passage of the working current of the motor 10 cut off, and the motor 10 is in the non-working state.
Fig. 4 is a schematic diagram of an application scenario of the reverse polarity protection circuit provided in the embodiment of the present application when the electric oil pump is in a fusing emergency working mode. Referring to fig. 4, when the fuse 41 is blown, the user correctly connects the power line of the electric oil pump again, and at this time, the motor controller 20 can detect that the fuse 41 is blown and the supply voltage between the positive power supply access terminal V1 and the negative power supply access terminal V0 is normal, thereby providing the second level to the switching module 43 through the signal output terminal S1 to control the switching module 43 to allow the current flowing from the first terminal to the second terminal to pass through, so that the operation current of the motor 10 can be provided to the motor 10 through the first and second terminals of the switching module 43 by bypassing the fuse 41 (the conduction path of the operation current of the motor 10 is indicated by a bold solid line, the current direction of which is indicated by an arrow), thereby achieving the driving of the motor 10 in a temporary emergency manner after the blowing occurs.
It can be seen that when the power line is correctly connected, the reverse polarity protection circuit can utilize the unidirectional conduction module and the switch module which are in the 'off' state to enable the working current to be provided for the motor only through the fuse, so that no power consumption can be generated in the normal working state; when the power lines are reversely connected, the reverse polarity protection circuit can form a fusing loop with two ends of the fuse directly connected between the two power lines by using the unidirectional conduction module in the on state and the switch module in the off state, so that the fuse is fused quickly, and the reverse polarity protection function is realized; when the power line is connected correctly after the fuse is fused, the reverse polarity protection circuit can temporarily replace the fuse by using the switch module in the on state under the control of the motor controller, and provide working current supply under emergency condition for the motor. Therefore, the reverse polarity protection circuit can realize double reverse polarity protection functions based on a relatively simple circuit structure, hardly generates any power consumption in a normal working state, and is beneficial to improving the safety and reliability of an electric oil pump, a vehicle and related products.
It should be noted that, since the power of the motor controller 20 may be supplied by the power voltage between the positive power supply terminal V1 and the negative power supply terminal V0, that is, the motor controller 20 may be in the power-off state, the first level cannot be provided to the control terminal of the switch module 43. Thus, the switching module 43 may be configured to prevent the passage of current between the first and second terminals when no electrical signal or level is received at the control terminal (floating state) to avoid the switching module 43 being turned on accidentally when no first level is received at the control terminal. It may be implemented, for example, by a normally closed relay or similar device or circuit structure, or the first level may be configured to be a high level (the voltage port may be considered to be a high level in a floating state), which is not limited by the embodiments of the present application.
Fig. 5 is a schematic circuit diagram of an electric oil pump according to an embodiment of the present application. Referring to fig. 5, in the electric oil pump, the fusing module 41 includes a fuse, the turn-on module includes a transient voltage suppressing diode D2 and a first capacitor C1, the switching module 43 includes a first transistor T1, and the motor driving circuit 30 includes a three-phase H-bridge having transistors as basic elements; in addition, the electric oil pump further includes a temperature sensor 50 and an interface circuit 60. As can be seen, the motor control terminal S2 of the motor controller 20 in this embodiment includes 6 output terminals, which are respectively connected to the gate of each transistor of the three-phase H-bridge in the motor driving circuit 30. As such, the motor controller 20 can control the steering and speed of the motor M1 by providing motor control signals to the three-phase H-bridge, realizing the basic functions of the electric oil pump.
In fig. 5, the switch module 43 includes a first transistor T1, where the first transistor T1 is a p-channel mosfet, a gate thereof is connected to a control terminal of the switch module 43, a drain thereof is connected to a first terminal of the switch module 43, and a source thereof is connected to a second terminal of the switch module 43, so as to be capable of operating in a cut-off region when a level at the gate is high and operating in a linear region or a saturation region when the level at the gate is low, thereby implementing the function of the switch module 43. Also shown in fig. 5 is the body diode D1 of the first transistor T1. In one example, the threshold voltage of the body diode D1 of the first transistor T1 is greater than the product between the maximum operating current of the motor 10 and the resistance of the fuse 41; thus, when the motor 10 is operated at the maximum operating current, the voltage across the body diode D1 does not reach its threshold voltage and is still in the off state, which can help to further reduce the power loss.
In fig. 5, the temperature sensor 50 is connected to the signal input terminal S3 of the motor controller 20, and the temperature sensor 50 is disposed near the mounting area of the three-phase H-bridge in the first transistor T1 and the motor driving circuit 30 to sense the temperature of the mounting area in real time, and generate a corresponding temperature sensing signal, which is collected by the motor controller 20 in real time through the signal input terminal S3. The above-mentioned switch module 43 is further configured to: when the motor controller 20 operates in the fusing emergency operation mode and the motor controller 20 determines that the temperature near the switching module 43 reaches the temperature threshold based on the temperature sensing signal received through the temperature sensor 30, the switching module 43 receives a first level from the motor controller 20 through the control terminal to cut off the operation current supplied to the motor 10. In one example, the motor controller 20 receives the temperature sensing signal through the temperature sensor 30 and determines whether the temperatures of the first transistor T1 and the installation region of the three-phase H-bridge in the motor driving circuit 30 reach the temperature threshold using an over-temperature detection model previously established through temperature sampling; when it is determined that the temperature reaches the temperature threshold, the motor controller 20 cuts off the operation current path of the motor 10 by supplying a high level voltage to the gate of the first transistor T1, thereby preventing the occurrence of damage to the device or safety problems due to overheating of the device caused by excessive load or occurrence of a short circuit.
In fig. 5, an interface circuit 60 is further disposed between the signal output end S1 of the motor controller 20 and the switch module 43, and the interface circuit 60 is configured to convert an electrical signal output by the electrical signal output end S1 of the motor controller 20 into an electrical signal suitable for controlling the switch module 43 to switch between an on state and an off state. In some examples, interface circuit 60 includes one or more of a filter, an operational amplifier, an inverter, a rectifying circuit, a voltage divider circuit, and a photocoupler. For example, the signal output terminal S1 of the motor controller 20 may be connected to the control terminal of the switch module 43 through the input terminal and the output terminal of the operational amplifier, so as to generate an amplified electrical signal to be provided to the control terminal of the switch module 43, and to isolate the motor controller 20 and the switch module 43 from each other.
In fig. 5, the unidirectional conduction module 42 includes a tvs diode D2 and a first capacitor C1, wherein a first end of the unidirectional conduction module 42 is connected to a negative electrode of the tvs diode D2 and a first end of the first capacitor C1, respectively, and a second end of the unidirectional conduction module 42 is connected to a positive electrode of the tvs diode D2 and a second end of the first capacitor C1, respectively. In this way, the unidirectional conduction module 42 can realize the function of controlling the conduction direction of the current as described above, and also can function to absorb the surge power and reduce the high-frequency noise superimposed on the power supply voltage.
It should be noted that the circuit configuration shown in fig. 5 is merely an example, and any one or more of the circuit configurations may be replaced by other circuit configurations having the same function. In addition, the circuit may further include other circuit structures, not shown, according to application requirements, which are not limited in the embodiments of the present application.
Fig. 6 is a flowchart illustrating a control method of the reverse polarity protection circuit according to an embodiment of the present application. Referring to fig. 6, the method is performed by the motor controller of any one of the above, and includes the following steps.
In step 601, when the motor controller operates in the normal operation mode, the motor controller provides a first level to the switch module through the signal output terminal to cause the switch module to block current flowing from the first terminal of the switch module to the second terminal of the switch module, such that an operating current of the motor is supplied to the motor through the first terminal and the second terminal of the fuse.
In step 602, when the motor controller detects that the fuse is blown and the power supply voltage between the positive power supply access terminal and the negative power supply access terminal of the electric oil pump is normal, the motor controller provides a second level to the switch module through the signal output terminal, so that the switch module allows a current flowing from the first terminal to the second terminal of the switch module, and an operation current of the motor is supplied to the motor through the first terminal and the second terminal of the switch module.
In some possible implementations, the reverse polarity protection circuit further includes a temperature sensor disposed proximate the switch module, the temperature sensor coupled to the signal input of the motor controller, the method further comprising: when the motor controller operates in the fusing emergency operation mode and the motor controller determines that the temperature near the switch module reaches the temperature threshold based on the temperature sensing signal received through the temperature sensor, the motor controller provides a first level to the switch module through the signal output terminal to cause the switch module to cut off the operation current supplied to the motor.
The implementation process of the control method of the reverse polarity protection circuit provided in the embodiment of the present application is consistent with the working principle and function of the reverse polarity protection circuit described above, and the effect achieved by the control method is the same as that of the reverse polarity protection circuit described above, and is not described here again.
Fig. 7 is a block diagram of a motor controller according to an embodiment of the present application. Referring to fig. 7, the motor controller includes: a processor 71; a memory 72 for storing executable instructions of the processor; wherein the processor 71 is configured to execute the executable instructions to implement any one of the control methods of the polarity reversing protection circuit. The architecture of fig. 7 may be applied to any of the motor controllers described above, and the processor 71 may be, for example, one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components; the memory 72 is a nonvolatile storage medium.
Fig. 8 is a block diagram of a vehicle apparatus according to an embodiment of the present application. Referring to fig. 8, the vehicle apparatus includes an engine 81, and the engine 81 includes any one of the electric oil pumps 811 (only the motor 10, the motor controller 20, and the motor drive circuit 30 are shown in fig. 8) provided with any one of the reverse polarity protection circuits described above. In addition to the configuration shown in FIG. 8, engine 50 may include, for example, one or more of a gearbox, a piston, a connecting rod, a crankshaft, a valve, an intake port, an exhaust port, an ignition system, a fuel system, other types of sensors, and mechanical control circuitry, and automotive equipment may include, for example, one or more of a chassis, a body, and electrical equipment, as the embodiments of the invention are not limited in this respect.
The foregoing description of the preferred embodiments is merely illustrative of the principles of the present application, and not in limitation thereof, and any modifications, equivalents, improvements and/or the like may be made without departing from the spirit and scope of the present application.
Claims (10)
1. A reverse polarity protection circuit of an electric oil pump, the electric oil pump comprising a motor and a motor controller, the reverse polarity protection circuit comprising:
the first end of the fuse is connected with the positive power supply access end of the electric oil pump, and the second end of the fuse is connected with the positive power supply end of the motor;
the unidirectional conduction module, the first end of unidirectional conduction module is connected the second end of fuse, the second end of unidirectional conduction module is connected respectively the negative pole power access end of electric oil pump with the negative power end of motor, unidirectional conduction module is configured as: preventing current flow from the first end of the unidirectional conduction module to the second end of the unidirectional conduction module and allowing current flow from the second end of the unidirectional conduction module to the first end of the unidirectional conduction module;
the first end of the switch module is connected with the positive power supply access end of the electric oil pump, the second end of the switch module is connected with the positive power supply end of the motor, the control end of the switch module is connected with the signal output end of the motor controller, and the switch module is configured to:
when the motor controller is operated in a normal operation mode, receiving a first level from the motor controller through the control terminal to block a current flowing from the first terminal of the switching module to the second terminal of the switching module, so that an operation current of the motor is supplied to the motor through the first terminal and the second terminal of the fuse;
when the motor controller is operating in a fuse emergency mode of operation, a second level from the motor controller is received by the control terminal to allow current to flow from the first end to the second end of the switch module such that an operating current of the motor is supplied to the motor through the first and second ends of the switch module.
2. The reverse polarity protection circuit of claim 1 further comprising a temperature sensor disposed proximate the switch module, the temperature sensor connected to a signal input of the motor controller, the switch module further configured to:
when the motor controller operates in a fuse emergency operation mode and the motor controller determines that a temperature near the switching module reaches a temperature threshold based on a temperature sensing signal received through the temperature sensor, a first level from the motor controller is received through the control terminal to cut off an operation current supplied to the motor.
3. The reverse polarity protection circuit of claim 1 wherein the switch module comprises a first transistor, the first transistor is a p-channel metal oxide semiconductor field effect transistor, a gate of the first transistor is connected to a control terminal of the switch module, a drain of the first transistor is connected to a first terminal of the switch module, a source of the first transistor is connected to a second terminal of the switch module, and a threshold voltage of a body diode of the first transistor is greater than a product between a maximum operating current of the motor and a resistance of the fuse.
4. The reverse polarity protection circuit of claim 1 further comprising an operational amplifier, said signal output of said motor controller further connected to a control terminal of said switching module via an input and an output of said operational amplifier.
5. The reverse polarity protection circuit of any one of claims 1 to 4 wherein the unidirectional conduction module comprises a transient voltage suppression diode and a first capacitance; wherein,
the first end of the unidirectional conduction module is respectively connected with the cathode of the transient voltage suppression diode and the first end of the first capacitor, and the second end of the unidirectional conduction module is respectively connected with the anode of the transient voltage suppression diode and the second end of the first capacitor.
6. A control method of a reverse polarity protection circuit, characterized in that the method is performed by the motor controller as claimed in any one of claims 1 to 5, the method comprising:
when the motor controller works in a normal working mode, the motor controller provides the first level to the switch module through the signal output end so that the switch module stops current flowing from the first end of the switch module to the second end of the switch module, and working current of the motor is supplied to the motor through the first end and the second end of the fuse;
when the motor controller detects that the fuse is fused and the power supply voltage between the positive power supply access end and the negative power supply access end of the electric oil pump is normal, the motor controller provides the second level to the switch module through the signal output end so that the switch module allows current flowing from the first end to the second end of the switch module, and working current of the motor is supplied to the motor through the first end and the second end of the switch module.
7. The method of claim 6, wherein the reverse polarity protection circuit further comprises a temperature sensor disposed proximate the switch module, the temperature sensor coupled to a signal input of the motor controller, the method further comprising:
when the motor controller operates in a fusing emergency operation mode and the motor controller determines that the temperature near the switch module reaches a temperature threshold based on a temperature sensing signal received through the temperature sensor, the motor controller supplies the first level to the switch module through the signal output terminal to cause the switch module to cut off an operation current supplied to the motor.
8. A motor controller, the motor controller comprising:
a processor;
a memory for storing executable instructions of the processor;
wherein the processor is configured to execute the executable instructions to implement the method of claim 6 or 7.
9. An electric oil pump comprising a motor, a motor controller, and the reverse polarity protection circuit according to any one of claims 1 to 5.
10. A vehicle apparatus, characterized in that the vehicle apparatus includes the electric oil pump according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410034627.2A CN117878862A (en) | 2024-01-09 | 2024-01-09 | Reverse polarity protection circuit, control method thereof, electric oil pump and vehicle device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410034627.2A CN117878862A (en) | 2024-01-09 | 2024-01-09 | Reverse polarity protection circuit, control method thereof, electric oil pump and vehicle device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117878862A true CN117878862A (en) | 2024-04-12 |
Family
ID=90578765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410034627.2A Pending CN117878862A (en) | 2024-01-09 | 2024-01-09 | Reverse polarity protection circuit, control method thereof, electric oil pump and vehicle device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117878862A (en) |
-
2024
- 2024-01-09 CN CN202410034627.2A patent/CN117878862A/en active Pending
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