| 摘要 |
This fault detection circuit is provided with: first and second capacitors (3, 4) that are provided such that signals given from a high voltage circuit (1) are inputted thereto, said first and second capacitors being connected in series; a low voltage circuit (5) to which signals outputted from the high voltage circuit are inputted via the first and second capacitors; step-down circuits (11, 14, 15, 18, 23) that step down voltages at the connection points of the first and second capacitors; and detection circuits (12, 13, 16, 17, 19, 24) that detect at least one fault of the first and second capacitors on the basis of the level of the voltage signals stepped down by means of the step-down circuit. When the first or second capacitor has a short-circuit fault, since a direct current voltage is added in either case, the level of the voltage signals becomes high. Consequently, the state of the circuit fault of the first or second capacitor can be detected when the low voltage circuit is in operation. |
