Patent ID: 9209698
Filing Date: 2015-12-08
Classification: H02M

Abstract:
1. An electric power conversion device, comprising: a transformer that is disposed between a first terminal and a second terminal; a first conversion part that is disposed between the first terminal and a first winding of the transformer; and a second conversion part that is disposed between the second terminal and a second winding of the transformer; wherein the electric power conversion device has a first operation mode and a second operation mode, the first operation mode being of converting DC power received from the first terminal into DC power having a desired voltage to be output to the second terminal, the second operation mode being of converting DC power received from the second terminal into DC power having a desired voltage to be output to the first terminal, wherein the first conversion part comprises: a first conversion circuit that is configured to bidirectionally convert power between the first terminal and the first winding; at least one first rectifying circuit that is configured to output DC power by receiving power supply from the first winding; and at least one first switching section that is configured to switch a connection state of the first rectifying circuit with respect to the first terminal, based on the first operation mode or the second operation mode, and wherein, by the first switching section switching the connection state of the first rectifying circuit, the first conversion part is configured to: in the first operation mode, supply the DC power received from the first terminal into the second conversion part through the first conversion circuit and the transformer; and in the second operation mode, output to the first terminal a voltage obtained by adding an output voltage of the first rectifying circuit to an output voltage of the first conversion circuit, wherein the transformer comprises, as the first winding, a first main winding that is connected with the first conversion circuit, and a first auxiliary winding that is connected with the first rectifying circuit, wherein the first conversion circuit comprises a first rectifier that is connected with the first main winding, and a first capacitor that is connected with a DC output of the first rectifier, wherein the first rectifying circuit comprises a second rectifier that is connected with the first auxiliary winding, and a second capacitor that is connected with a DC output of the second rectifier, wherein the first capacitor is connected in series with the second capacitor, a set of the first and second capacitors being connected to the first terminal, and wherein the first switching section is a switching element that is connected between both ends of the second capacitor, the first switching section being configured to, in the first operation mode, be turned on to cause short-circuiting between the both ends of the second capacitor, and, in the second operation mode, be turned off.