Patent ID: 8605464

Claim:
A power converter comprising: a first inductor; a rectifier arm including a first diode and a second diode with series connection in forward-polarity; a first switch arm including a first switch circuit and a second switch circuit in series connection, each having a semiconductor switching component and a diode in reverse parallel; a second switch arm including a third switch circuit, having a semiconductor switching component and a diode in reverse parallel, and a first capacitor in series connection; a LC serial circuit including a second inductor and a second capacitor in series connection; a Transformer including a primary winding and a secondary winding; a rectification and smoothing circuit connected to the secondary winding of the transformer; and a control circuit to perform on-off control of the first, the second and the third switch circuits based on a PWM signal, wherein the rectifier arm, the first switch arm, the second switch arm and the LC serial circuit are connected in parallel with each other, the second inductor of the LC serial circuit, the second capacitor and the primary winding of the transformer are connected serially, an AC power supply is connected to the connection point of the first and second diodes in the rectifier arm and the connection point of the first and second switch circuits in the first switch arm via the first inductor, wherein the control circuit includes: an output voltage control circuit to perform on-off control of at least one of the first or second switch circuit, in addition to the third switch circuit, for controlling an output voltage from the rectification and smoothing circuit at a specific setting value, using a detection information of the output voltage, an intermediate voltage control circuit to control an intermediate voltage at a specific setting value, using a detection information of a terminal voltage at the first capacitor and an output current from the rectification and smoothing circuit, and a power factor correction control circuit to perform on-off control of at least the other of the first or second switch circuit, using a detection information of an input current of the AC power supply and the output voltage from the rectification and smoothing circuit, as well as an output control signal from the intermediate voltage control circuit.