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.
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.
| JPS5330753 | LEAK DETECTOR |
| JP2016001525 | LIQUID LEAKAGE DETECTION SYSTEM |
| WO/2010/113917 | GROUND FAULT DETECTION DEVICE, ELECTRIC VEHICLE CHARGER, AND GROUND FAULT DETECTION METHOD |
OKUDA MINORU
TAKEUCHI JUN
| JPH01291623A | 1989-11-24 | |||
| JPS62236320A | 1987-10-16 |