Circuit fault detection device

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 receives the output signal of the signal synthesis unit after a pulse signal in an OFF state is output from the pulse generation unit and determines whether a circuit fault has occurred on a basis of whether OFF is observed in the output signal.

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 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, wherein
• the adjusting unit adjusts a time during which the pulse signal is in an OFF state on a basis of an output voltage of the filter circuit.

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 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 receives the output signal of the signal synthesis unit after a pulse signal in an OFF state is output from the pulse generation unit and determines whether a circuit fault has occurred on a basis of whether OFF is observed in the output signal, wherein
• the adjusting unit adjusts a time during which the pulse signal is in an OFF state on a basis of an output voltage of the filter circuit.