Electric vehicle pre-charging completion state detection device based on passive isolation
A technology of electric vehicles and complete state, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of waste of resources, high cost of circuit design, etc., achieve low cost, improve safety and reliability, and reduce power-on impulse current Effect
Active Publication Date: 2018-06-15
郑州日产汽车有限公司
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Problems solved by technology
Although this method is effective, the DC / DC isolation module, operational amplifier, signal isolation module and other circuit design costs are relatively high, and the circuit is only used when powering on, resulting in a waste of resources
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[0009] Such as figure 1 As shown, the electric vehicle pre-charging completion state detection device based on passive isolation of the present invention includes a photocoupler 1, the anode of the light-emitting diode of the photocoupler 1 is connected to the anode of the Zener diode DZ1 and connected to the high-voltage NMOS through a resistor R1 The gate of the tube Q1 is connected; the negative pole of the Zener diode DZ1 is connected to the negative pole of the diode D1, and the positive pole of the diode D1 is electrically connected to the first connector 3; the negative pole of the light-emitting diode of the photocoupler 1 is connected to the drain of the high-voltage NMOS transistor Q1 pole connection, the gate of the high-voltage NMOS transistor Q1 is connected to the negative pole of the Zener diode DZ2 and the input end of the three-terminal voltage regulator tube 2, and the positive pole of the Zener diode DZ2 and the output end of the three-terminal voltage regula...
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The invention discloses a detection device for the pre-charging completion state of an electric vehicle based on passive isolation, which includes a photocoupler, the anode of a light-emitting diode of the photocoupler is connected to the anode of a voltage-stabilizing diode and connected to the gate of an NMOS tube through a resistor; The cathode of the diode is connected to the cathode of the diode, and the anode of the diode is connected to the first connector; the cathode of the light-emitting diode of the photocoupler is connected to the drain of the NMOS transistor, the gate of the NMOS transistor is connected to the input end of the three-terminal voltage regulator, and the output of the three-terminal voltage regulator The terminal is electrically connected to the second connector; the source of the NMOS tube is connected to the output terminal of the three-terminal voltage regulator tube through a resistor; the output terminal of the light-receiving transistor of the photocoupler is used to connect with the signal input terminal of the battery management system of the electric vehicle. The invention has the advantages of adopting a simple and effective circuit design to realize the judgment of the pre-charging completion state of the pure electric vehicle, and has low cost and convenient maintenance, and effectively improves the safety and reliability of the vehicle-mounted power distribution system.
Description
technical field [0001] The invention relates to a detection device for the pre-charging completion state of an electric vehicle, in particular to a detection device for the pre-charging completion state of an electric vehicle based on passive isolation. Background technique [0002] The drive motor controllers, DC / DC converters, chargers, steering motor controllers, and air-conditioning compressor controllers used in electric vehicles are mostly designed by adding large-capacity capacitors to the high-voltage input unit for energy storage filtering. Therefore, it is necessary to add a pre-charging resistor to the on-board power distribution system to reduce the power-on current impact and achieve the purpose of protecting the drive motor controller. In the current design of electric vehicles, the judgment of the pre-charging completion state mostly adopts a circuit composed of a DC / DC isolation module, an operational amplifier, and a signal isolation module to detect the vol...
Claims
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IPC IPC(8): G01R31/36
Inventor 袁建州于丽娜路高磊付攀刘洋魏祯祁娄世菊陈艳艳张晓林阴晓慧
Owner 郑州日产汽车有限公司