Ground fault detection device
The purpose of the present invention is to prevent the detection accuracy of an insulation resistor from being reduced due to the influence of a Y capacitor without increasing detection time and cost. This object is achieved by a ground fault detection device (100) comprising: a detection capacitor...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The purpose of the present invention is to prevent the detection accuracy of an insulation resistor from being reduced due to the influence of a Y capacitor without increasing detection time and cost. This object is achieved by a ground fault detection device (100) comprising: a detection capacitor (C1); a switch group (S1-S4) for switching between a first charging path connecting the battery (300) and the detection capacitor, a second charging path connecting the battery, the negative-side insulation resistor (RLn) and the detection capacitor, a third charging path connecting the battery, the positive-side insulation resistor (RLp) and the detection capacitor, and a measurement path for measuring the charging voltage of the detection capacitor; and a controller (110) configured to calculate an insulation resistance based on a charging voltage measurement of the detection capacitor present after charging of each charging path, in which, after measuring a charging voltage of the second charging path, the contr |
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