Patent ID: 7839128
Filing Date: 2010-11-23
Classification: H02M

Abstract:
1. A bidirectional power supply device comprising: a bidirectional DC-DC converter including: a third switch having one end connected to the first positive terminal or the first negative terminal, and being ON/OFF controlled by the control circuit; a first power supply connected in series to the third switch, the series circuit being connected between the first positive terminal and the first negative terminal; and a second power supply connected between the second positive terminal and the second negative terminal; wherein the control circuit turns OFF the third switch and operates the switching signal generation circuit so that the ON time of the first switch becomes a maximum when stopping supply of power from the first positive terminal and the first negative terminal to the second positive terminal and the second negative terminal; and the control circuit makes the switching signal generation circuit started so that the ON time of the first switch becomes a maximum with the third switch turned OFF when supplying power from the second positive terminal and the second negative terminal to the first positive terminal and the first negative terminal.