Mitsubishi Electric Corporation

Masahiko Sayama

Shuichi Matsumoto

Masao Motonobu

In order to avoid the continuation of the abnormality control state by detecting the disconnection abnormality of the ground wiring line of a power supply control device provided between a DC power supply and a plurality of inductive loads, the power supply control device to which electric power is supplied through a power supply terminal includes a microprocessor that performs switching control of power switching elements, a constant voltage power supply, and commutation diodes connected in parallel to inductive loads, a power capacitor connected between the power supply terminal and a ground terminal is charged by the commutation current of the intermittently driven inductive loads when the ground terminal is disconnected and accordingly the voltage of the power capacitor rises, and the disconnection abnormality of the ground wiring line is detected when the voltage exceeds a predetermined threshold value and the power switching elements are simultaneously cut off.

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Kobe, Japan

Masahiko Sayama