Patent ID: 9602020
Date: 2017-03-21
CPC Classifications: H02M,Y02B

Claim:
1. A power conversion device comprising: a rectifying circuit that rectifies an input from an AC power supply; a half bridge type inverter circuit that includes a first semiconductor element, a second semiconductor element, and a DC capacitor, in which a connection point between the first semiconductor element and the second semiconductor element is connected to a bus of the AC power supply; a smoothing capacitor that smooths an output voltage; a third semiconductor element that is connected between the first semiconductor element of a positive side of the inverter circuit and a positive side of the smoothing capacitor; a fourth semiconductor element that is connected between the second semiconductor element of a negative side of the inverter circuit and a negative side of the smoothing capacitor; and a control circuit that controls the first to fourth semiconductor elements, wherein the control circuit controls turning-on and turning-off of the fourth semiconductor element so that a DC voltage of the DC capacitor tracks a target voltage of the DC capacitor, and controls turning-on and turning-off of the second semiconductor element so that a DC voltage of the smoothing capacitor tracks a target voltage of the smoothing capacitor and thus an input power factor from the AC power supply is adjusted, and sets a driving frequency for turning-on and turning-off control of the second semiconductor element to be higher than a driving frequency for turning-on and turning-off control of the fourth semiconductor element.