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Electric vehicle motor controller discharge circuit and vehicle

A motor controller and discharge circuit technology, applied in electric vehicles, emergency protection circuit devices for limiting overcurrent/overvoltage, control drives, etc., can solve problems such as high bus voltage and electric shock, and achieve enhanced high-voltage safety, Effects of improving safety and reducing power

Inactive Publication Date: 2020-10-16
ZHEJIANG GEELY HLDG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the bus voltage in the motor controller is too high, and there is an electric shock problem for people in the vehicle

Method used

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  • Electric vehicle motor controller discharge circuit and vehicle
  • Electric vehicle motor controller discharge circuit and vehicle
  • Electric vehicle motor controller discharge circuit and vehicle

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Embodiment Construction

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner" and "outer" are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specifi...

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Abstract

The invention discloses an electric vehicle motor controller discharge circuit and a vehicle. The discharge circuit comprises a sampling circuit, a microprocessor and a discharge execution circuit; the sampling circuit and the discharge execution circuit are both connected in parallel with a bus of a motor controller; the output end of the sampling circuit is connected with the first input end ofthe microprocessor, and the output end of the microprocessor is connected with the input end of the discharge execution circuit; the sampling circuit is used for collecting a bus voltage value of themotor controller and transmitting the bus voltage value to the microprocessor; and the microprocessor is used for determining a discharge instruction and a duty ratio of the discharge instruction according to the bus voltage value and transmitting the discharge instruction to the discharge execution circuit, so the discharge execution circuit discharges when the discharge instruction is at a low level, and the discharge instruction is in a pulse width modulation form. According to the invention, the first resistor works in an intermittent discharge state, the power of the first resistor can bereduced, and the temperature rise rate of the first resistor is reduced.

Description

technical field [0001] The invention relates to the technical field of electric vehicle motor controller discharge, in particular to an electric vehicle motor controller discharge circuit and a vehicle. Background technique [0002] After the new energy electric vehicle stops and disconnects the main relay, due to the large capacitance of the bus capacitor in the motor controller, the motor controller is still in a high voltage state, and the high bus voltage will cause the risk of electric shock. [0003] At present, the active discharge circuit of the new energy electric vehicle motor controller generally uses a fixed level to control the opening or closing of a field effect transistor, and continuously discharges the first resistor connected in series on the high voltage side. This method will cause the first resistor The heat is serious, and it is necessary to select resistors with different powers according to different voltage levels; secondly, the motor controller can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H1/00B60L15/20
CPCB60L15/20H02H1/0007H02H9/045Y02T10/72
Inventor 郑飞刘波桂星星
Owner ZHEJIANG GEELY HLDG GRP CO LTD
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