Patent ID: 9395421
Filing Date: 2016-07-19
CPC Classification: G01R,H02H,H02P

Claim Text:
1. A circuit fault detection device comprising: an interruption-signal generation unit that outputs an interruption signal for a drive circuit stopping driving of a drive target on a basis of the interruption signal; a pulse generation unit that includes an adjustment unit adjusting a time during which a pulse signal is in an OFF state on a basis of a PWM signal input to the drive circuit and that generates the pulse signal; a signal synthesis unit that outputs a logical AND of the interruption signal and the pulse signal; a low-pass filter circuit that inputs, as an output, a signal obtained by delaying an output signal of the signal synthesis unit to the drive circuit; and a monitoring unit that determines whether a circuit fault has occurred on a basis of whether a decline in an output voltage of the low-pass filter circuit is observed after a pulse signal in an OFF state is output from the pulse generation unit.