Patent ID: 9024769
Filing Date: 2015-05-05
Classification: G01R,H01M,Y02E

Abstract:
1. An isolation resistance measuring apparatus having a fault self-diagnosing function, the apparatus comprising: a first isolation resistance measuring unit and a second isolation resistance measuring unit respectively connected to a cathode terminal and an anode terminal of a battery; a first diagnosing unit and a second diagnosing unit respectively connected to the anode terminal and the cathode terminal of the battery; a first switch and a second switch configured to respectively connect the first isolation resistance measuring unit and the second isolation resistance measuring unit to the cathode terminal and the anode terminal to form first and second circuits different from each other; a third switch and a fourth switch configured to respectively connect the first diagnosing unit and the second diagnosing unit to the anode terminal and the cathode terminal to form third and fourth circuits different from each other; a voltage detection unit configured to sense first and second isolation detection voltages and first and second diagnosis detection voltages applied to the first and second isolation resistance measuring units; and a control unit configured to output a control signal to the first to fourth switches, and determine whether a fault arises at the isolation resistance measuring apparatus by using first and second isolation detection voltages detected in an isolation resistance measuring mode, where the first and the second switches are alternatively turned on while the third and the fourth switches are turned off, and using first and second diagnosis detection voltages detected in a fault self-diagnosing mode, where the first and the third switches are turned on and the second and the fourth switches are turned off, and contrariwise the first and the third switches are turned off and the second and the fourth switches are turned on.