Insulation fault detection device for e.g. lithium ion phosphate battery of motorization system of electric car, has control circuit to simultaneously maintain one of current limiting circuits in open state and other circuit in closed state

摘要

The device (4) has a first current limiting circuit (41) connected between a first input terminal (47) and an intermediate point (49). A second current limiting circuit (42) is connected between a second input terminal (48) and the point. An insulation fault current detection circuit (45) is connected between an electric ground (93) and the point. The limiting circuits selectively open and close the connection between the respective terminals and the point. A control circuit (8) simultaneously maintains one of the limiting circuits in open state and the other limiting circuit in closed state. The control circuit is formed by a battery operation supervision controller. An independent claim is also included for a motorization system.