Patent ID: 8169199
Filing Date: 2012-05-01
Classification: H02M,Y02B

Abstract:
1. A power supply device that transmits electric power to and from an electrical apparatus, said power supply device comprising: a DC power supply; a boost converter that includes a first switching element connected in series with said electrical apparatus when viewed from said DC power supply, a second switching element connected in series with said first switching element and connected in parallel to said electrical apparatus when viewed from said DC power supply, and a reactor connected to a middle point between said first switching element and said second switching element and to an output terminal of said DC power supply, and can adjust on times of the switching elements at predetermined periods to increase a voltage of said DC power supply and supply the voltage to said electrical apparatus; a voltage smoothing unit that is connected in parallel to said electrical apparatus when viewed from said boost converter and smoothes a voltage applied to said electrical apparatus; a zero current stagnation state detecting module that detects a periodic zero current stagnation state where a zero current stagnation state, where a reactor current flowing through said reactor stagnates at a value of 0, occurs at said predetermined periods; and a control unit that controls said boost converter on the basis of a voltage command that is a target value of the voltage applied to said electrical apparatus and the periodic zero current stagnation state detected by said zero current stagnation state detecting module.