Patent ID: 8952701
Filing Date: 2015-02-10
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 switch and a second switch for connecting the first isolation resistance measuring unit and the second isolation resistance measuring unit to the cathode terminal and the anode terminal, respectively; a voltage detection unit for sensing first and second diagnosis voltages by means of the first and second isolation resistance measuring units; and a control unit for outputting control signals to the first and second switches to form a diagnosis circuit, the control unit determining whether a fault arises at the isolation resistance measuring apparatus by using a circuit equation derived from the diagnosis circuit and the first and second diagnosis voltages received from the voltage detection unit when the diagnosis circuit is formed, wherein the second isolation resistance measuring unit further includes a DC power applying unit, and wherein the control unit determines whether a fault arises at the isolation resistance measuring apparatus, by checking whether the following equation is valid when the first and second diagnosis voltages are put therein: where V