Inrush current suppression device and motor drive device

Abstract

An inrush current suppression device is an inrush current suppression device that suppresses an inrush current flowing from a DC power supply through a mechanical switch, and includes: a first capacitor having one end connected to a positive terminal of the DC power supply through the mechanical switch; a semiconductor switching element connected to the other end of the first capacitor and a negative terminal of DC power supply between the other end of the first capacitor and the negative terminal of the DC power supply; a resistance element connected in parallel to the semiconductor switching element; and a control circuit for controlling the semiconductor switching element. The control circuit has a first output port, and controls ON time and OFF time of the semiconductor switching element by outputting a PWM signal from the first output port to the semiconductor switching element after the mechanical switch is closed.

Dependencies are inferred from the claim text.