Patent ID: 8139385

Claim:
An inverter control circuit, controlling an inverter circuit including a switch device, the inverter control circuit comprising: a timer circuit configured to generate a PWM signal for controlling an electric conductive state of the switch device; an amplifier configured to receive, amplify, and output an analog signal generated with a load electric current of the inverter circuit; and a gain control circuit configured to control switching of a gain of the amplifier in synchronization with an output change timing of the PWM signal, an A/D converter, wherein an output of the amplifier is converted into digital data, a pulse width of the PWM signal is adjusted based on the digital data, wherein the gain control circuit controls the gain of the amplifier so that a plurality of voltage levels of the analog signal are amplified in a range not exceeding a reference voltage of the A/D converter, wherein the timer circuit includes an A/D trigger signal generation circuit which outputs an A/D trigger signal indicative of a conversion start timing of the A/D converter so that the analog signal amplified after the switching of the gain of the amplifier is converted from analog to digital.