Patent ID: 7274173
Filing Date: 2007-09-25
Classification: H02M,H02P

Abstract:
1. A power control circuit for a charge storage element comprising: a first series circuit comprising a DC voltage source, a first switch, and an inductor that are connected to one another in series; a second series circuit comprising a second switch, a charge storage element, and the inductor that are connected to one another in series; a capacitance component connected to at least one of the first switch, the second switch and the inductor in parallel; and a control circuit for switching the first switch and the second switch on or off, wherein the control circuit repeats a first state where the second switch is turned off and the first switch is turned on to make current flow in a closed circuit comprising the DC voltage source, the first switch, and the inductor to thereby transfer power between the DC voltage source and the inductor, a second state where the first switch is turned off and the second switch is turned on to make current flow in a closed circuit comprising the second switch, the inductor, and the charge storage element to thereby transfer power between the inductor and the charge storage element while interposing between the first state and the second state a third state where both the first switch and the second switch are turned off, and under the third state where both the first switch and the second switch are turned off, the control circuit turns on either switch to be turned on when a voltage across that switch to be turned on is reduced by resonance of a resonance circuit comprising the capacitance component and the inductor after the third state is set by turning off the first and second switches.