Semiconductor device for inverter controlling

Abstract

In a semiconductor device for inverter controlling that includes an AD converter and controls a pulse width of a multi-phase PWM signal on the basis of a digital value obtained by the AD converter, a timer starts counting time in response to a signal supplied from a counter used for generating a PWM signal when the counter has counted a given count value. A timer period of the timer is calculated on the basis of a duty set value stored in a duty set resistor included in a PWM signal generation circuit, and the timer period is stored in a timer period set resistor. The timer generates an AD conversion start factor signal when the timer has counted the timer period stored in the timer period set resistor, and the AD conversion start factor signal is output to the corresponding AD converter so as to start AD conversion. Accordingly, the AD conversion can be definitely started at a time of a predetermined specific ON/OFF combination of the PWM signal.

Dependencies are inferred from the claim text.