Patent ID: 8097981
Filing Date: 2012-01-17
Classification: B60L,H02J,H02M,Y02E,Y02T,Y04S

Abstract:
1. An AC/DC power converter having functions of a forward conversion from AC to DC and an inverse conversion from DC to AC, comprising: a magnetic-energy-recovery two-way switch including a bridge circuit being comprised of four reverse-conductive type semiconductor switches, a capacitor connected between DC terminals of the bridge circuit for storing magnetic energy existing when a current is cut off, a control unit for controlling ON/OFF of each of the reverse-conductive type semiconductor switches by sending control signal to a gate of each of the reverse-conductive type semiconductor switches; an AC inductance having one end connected to an AC power supply and an other end connected to an AC terminal of the bridge circuit; and a DC inductance having one end connected to a secondary battery serving as a DC power supply and an other end connected to a DC terminal of the bridge circuit; wherein a capacitance C of the capacitor and an inductance L of the AC inductance are set to such values as to make the resonance frequency determined by the C and L higher than the frequency of the AC power supply; and wherein the control unit controls the control signals so as to turn simultaneously ON/OFF the pairs of the reverse-conductive type semiconductor switches diagonally located in synchronization with the voltage of the AC power supply, and to prevent the two pairs of the reverse-conductive type semiconductor switches from being turned ON simultaneously; and the control unit further controls the control signals in such a manner that the phase of the control signals delays as compared to the phase of the AC power supply when a forward conversion is carried out, and the phase of the control signals advances as compared to the phase of the AC power supply when an inverse conversion is carried out.