| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that a ground-fault detection device of each system operates due to sneak ground fault current at a DC ground fault, and a ground-fault circuit cannot be discriminated, in a multiplex DC power supply circuit which feeds power to loads in parallel constantly. <P>SOLUTION: The DC ground-fault detection circuit having two sets of resistors connected in series between a positive electrode and a negative electrode of a DC power supply circuit, and a grounding circuit for grounding a middle point of the two sets of resistors via a third resistor, and detecting the DC ground fault by using a current flowing in the grounding circuit, comprises: backflow preventing elements 10A, 10B through which currents flow toward the middle point of the resistors from the positive electrode; and backflow preventing elements 11A, 11B through which currents flow toward the negative electrode from the middle point of the resistors. <P>COPYRIGHT: (C)2009,JPO&INPIT |
