Drive current detection device, drive current detection method, failure detection device, and failure detection method for PWM load equipment

摘要

When detecting a failure of a PWM load device, it is possible to correctly detect a load device failure even when a load device whose duty ratio of the PWM waveform has changed or when a load device with a different drive current is connected. A failure detection device and a failure detection method are provided. The failure detection apparatus according to the present invention samples the current flowing through the PWM load device at a predetermined cycle, determines a current drive section based on the sampled sample value, and uses the sample value in the current drive section to detect a failure. A drive current value for determining the presence or absence of is determined.