Patent ID: 8947898
Filing Date: 2015-02-03
Classification: H02M

Abstract:
1. A power conversion circuit converting DC electric power of a DC power supply into AC electric power to send the AC power to an inductive load, comprising: a first switching device connected to a positive pole of the DC power supply to exhibit a conductive state and a current interrupting state; a first diode arranged parallel to the first switching device; a second switching device connected to a negative pole of the DC power supply to exhibit a conductive state and a current interrupting state; a second diode arranged parallel to the second switching device; a first inductor provided between an output point for the inductive load and a first connection point between the first diode and the first switching device; a second inductor provided between the output point for the inductive load and a second connection point between the second diode and the second switching device; and a clamping diode connected between the first connection point and the second connection point so that conduction is provided in one direction from the second connection point to the first connection point, wherein the first and second switching devices and the clamping diode are arranged such that when the first switching device is turned on, a current flows through the first switching device, the first inductor and the inductive load, and when the first and second switching devices are turned off, a current flows through the second diode, the clamping diode, the first inductor, the output point and the inductive load to thereby completely flow out a current in the first inductor to reduce loss of the current, and then a current flows through the second diode, the second inductor, the output point and the inductive load.