MOTOR DRIVE DEVICE

摘要

Without using larger components as components which configure a boosting section, the amount of heat generated in the components is suppressed when variation in the power source voltage is generated. A boosting section (34) generates a post-boosting voltage (V2) by boosting a post-rectifying voltage (V1). A drive voltage output section (37) generates a drive voltage (SU to SW) using the post-boosting voltage (V2) and outputs the drive voltage (SU to SW) to a compressor motor (M12). An input side detecting section (33) detects a value of the post-rectifying voltage (V1) or a variation width with regard to a reference value as power source variation information (Vf1) when there is power source variation. A memory (42) stores target value association information Infl which associates a boosting target value Tp and the power source variation information (Vfl). The boosting target value Tp is a target value for the post-boosting voltage (V2) which is to be generated by the boosting section (34). The determining section (43) determines the boosting target value Tp based on the target value association information Infl and the power source variation information (Vf1) which is detected. In particular, the target value association information Inf1 is determined based on the range of operations of the drive voltage output section (37).