×

Method and apparatus for high voltage isolation monitor for a vehicle

  • US 9,341,665 B2
  • Filed: 04/18/2012
  • Issued: 05/17/2016
  • Est. Priority Date: 04/18/2012
  • Status: Active Grant
First Claim
Patent Images

1. An apparatus for monitoring a high voltage isolation in a vehicle, the apparatus comprising:

  • a power conversion device for receiving a high voltage on a power bus, the power bus including a first node and a second node, the power conversion device being configured to;

    control a first switch to close to enable a first known resistance to receive the high voltage;

    initiate a timer in response to controlling the first switch to close;

    measure a first voltage between the first node and a ground in response to the first known resistance receiving the high voltage after the timer has expired;

    measure a second voltage between the second node and the ground in response to the first known resistance receiving the high voltage after the timer has expired; and

    determine a first leakage resistance between the first node and the ground based on at least the first voltage and the second voltage, the first leakage resistance being indicative of whether the high voltage is isolated from the ground, wherein the power conversion device includes a relay to enable the high voltage to pass through the first switch when the power conversion device is in a normal operating mode and to prevent a voltage to pass through the first switch when the power conversion device is exposed to a hi-pot test, wherein the power conversion device is powered off when the hi-pot test is executed and the relay prevents the voltage from passing through the first switch when the hi-pot test is executed, and wherein the hi-pot test corresponds to electrically-over stressing the power conversion device.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×