A new energy vehicle trailer protection circuit and its implementation method

A new energy vehicle, protection circuit technology, applied in electric vehicles, electrical devices, power management and other directions, can solve the problems of motor drive system design difficulties, and achieve the effect of preventing overvoltage damage

Active Publication Date: 2015-11-18
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method brings difficulties to the design of the motor drive system of new energy vehicles

Method used

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  • A new energy vehicle trailer protection circuit and its implementation method
  • A new energy vehicle trailer protection circuit and its implementation method
  • A new energy vehicle trailer protection circuit and its implementation method

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Embodiment Construction

[0033] see Figure 5 to Figure 6 In the following, a specific embodiment will be used to describe in detail the trailer protection circuit of the new energy vehicle of the present application.

[0034] The motor control system of the new energy vehicle includes a permanent magnet synchronous motor 1 , an inverter 2 , a high voltage battery 3 and a low voltage battery 4 . The inverter 2 is further divided into a high-voltage side 21 and a low-voltage side 22 , which are electrically isolated from the drive module 23 through isolation. During normal operation, the high-voltage side 21 converts the high-voltage direct current of the high-voltage battery 3 into three-phase alternating current to drive the permanent magnet synchronous motor 1 . The feedback energy of the permanent magnet synchronous motor 1 is also converted through the high voltage side 21 to charge the high voltage battery 3 . Under normal circumstances, the low-voltage side 22 supplies power to the low-voltage...

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Abstract

The invention discloses a trailer protection circuit of a new energy automobile. An isolation-type DC-DC converter powered by a bus capacitor of a high-voltage side of an inverter is added into an isolating and driving module, and a spare control chip is also added. The invention further discloses an implementation method of the trailer protection circuit. The spare control chip has a voltage reference value, a spare driving signal is outputted when the voltage of two ends of the bus capacitor is lower than the voltage reference value, so that a permanent magnet synchronous motor outputs negative torque, and a spare driving signal is outputted when the voltage of two ends of the bus capacitor is higher than the voltage reference value, so that the permanent magnet synchronous motor outputs positive torque. By the aid of the trailer protection circuit, the torque output of the permanent magnet synchronous motor can be controlled when the new energy automobile is dragged due to failure, the permanent magnet synchronous motor is continually switched over a motor mode and a generator mode, so that the voltage of the two ends of the bus capacitor is kept not higher than set safety voltage, and possible overvoltage damage of an electronic device is prevented.

Description

technical field [0001] The present application relates to a trailer protection circuit of a new energy vehicle (including an electric vehicle, a hybrid vehicle, etc.), and a method for realizing trailer protection by the circuit. Background technique [0002] see figure 1 , which is a simplified schematic diagram of a motor control system for a new energy vehicle. The motor control system includes: [0003] ——Permanent magnet synchronous motor 1, whose mechanical output shaft is connected with the transmission system of the new energy vehicle to output torque and power for the new energy vehicle. When the permanent magnet synchronous motor 1 is driven at high speed, it also generates three-phase alternating current in reverse. [0004] - The inverter 2 is divided into a high-voltage side 21 and a low-voltage side 22 which are electrically isolated from each other. [0005] - High voltage battery 3, the voltage is usually above several hundred volts. [0006] ——Low-volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/00
CPCY02T10/7216Y02T10/7241Y02T10/72
Inventor 张兴春周宣
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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