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Method and apparatus to monitor loss of ground isolation of an electric motor drive circuit

A technology of electrical isolation and electrical grounding, which is applied in the field of grounding isolation loss, and can solve problems such as failure to measure fault voltages

Active Publication Date: 2014-04-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the fault voltage may not be measured

Method used

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  • Method and apparatus to monitor loss of ground isolation of an electric motor drive circuit
  • Method and apparatus to monitor loss of ground isolation of an electric motor drive circuit
  • Method and apparatus to monitor loss of ground isolation of an electric motor drive circuit

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Embodiment Construction

[0057] Referring now to the accompanying drawings, the content shown therein is only used to illustrate certain exemplary embodiments, not to limit these exemplary embodiments, figure 1 A high-voltage circuit 100 is schematically illustrated, which includes a positive DC power bus 20 (HV+) and a negative DC power bus configured to transmit high-voltage DC power between a high-voltage energy storage device or battery pack (BP) 15 and a plurality of electrical devices 30(HV-). The electrical device includes a converter module (TPIM) 25 that operates to convert high-voltage DC power into high-voltage AC power that is transmitted to a multi-phase electric machine. In one embodiment, the multi-phase electric machine is a multi-phase synchronous AC electric machine including a stator and a rotor magnetically coupled to the stator. In one embodiment, the multi-phase electric machine is configured to generate torque, which is transmitted to the powertrain of the vehicle via the rotor t...

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PUM

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Abstract

A method for monitoring electric isolation of a high voltage DC bus to detect ground isolation faults includes monitoring voltage differentials between a positive DC electric power bus and a negative DC electric power bus and a chassis ground. Electrical isolation between each of the positive and negative DC electric power buses and the chassis ground is monitored using a ratio of the voltage differentials.

Description

Technical field [0001] The present invention relates to a motor control circuit, in particular to monitoring the ground isolation loss in a high voltage DC bus of the motor control circuit. Background technique [0002] The explanations in this section only provide background information related to the present invention and may not constitute prior art. [0003] Both hybrid vehicle systems and electric vehicle systems use high-voltage systems that provide power to traction motors and other motors. The high-voltage system includes a high-voltage DC power source, such as a battery electrically connected to a traction motor via a power converter. The power converter converts DC power to AC power to drive a traction motor, and preferably converts AC power to DC power to charge the battery. The high-voltage DC power supply is electrically connected to the power converter via a positive high-voltage bus (HV+) and a negative high-voltage bus (HV-). Other motors that utilize high voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/025G01R31/02G06F19/00G16Z99/00G01R31/52G01R31/50
Inventor S·M·N·哈桑D·P·塔斯基M·N·安瓦W·D·王
Owner GM GLOBAL TECH OPERATIONS LLC