Discharge control circuit

Abstract

A discharge control circuit that allows an electric charge accumulated in a smoothing capacitor, which is interposed between a main power source that supplies DC power to an electric circuit and the electric circuit, to be discharged when connection between the main power source and the electric circuit is interrupted, includes a series resistor section formed by connecting a first resistor and a second resistor in series with each other and connected in parallel with the smoothing capacitor; and a switch connected in parallel with the first resistor, controlled to a non-conductive state when connection between the main power source and the electric circuit is maintained, and controlled to a conductive state to short-circuit both ends of the first resistor when connection between the main power source and the electric circuit is interrupted.

Dependencies are inferred from the claim text.