Contactless power transfer system

摘要

A half-bridge inverter is used for a high frequency alternating current power supply to be connected to a primary side of a contactless power transformer, and a voltage-doubler rectifier is used to convert a secondary-side alternating current output of the contactless power transformer into a direct current.

主权项

1. A contactless power transfer system in which a high frequency alternating current power supply is connected to a primary side of a contactless power transformer and a rectifier which converts a secondary-side alternating current output into a direct current is connected to a secondary side of the contactless power transformer,
wherein the high frequency alternating current power supply is formed of a half-bridge inverter and the half-bridge inverter is connected to the primary side of the contactless power transformer through a series capacitor, the rectifier is formed of a voltage-doubler rectifier and the voltage-doubler rectifier is connected to the secondary side of the contactless power transformer through a parallel capacitor, the voltage-doubler rectifier includes: a capacitor arm in which two capacitors C1 and C2 are connected in series, a first diode D1 which is inserted between one end of the capacitor arm and one end of a secondary-side circuit of the contactless power transformer so as to make the capacitor arm the forward side, and a second diode D2 which is inserted between another end of the capacitor arm and the one end of the secondary-side circuit so as to make the capacitor arm the reverse direction side, and a central point of the capacitor arm is connected to another end of the secondary-side circuit, wherein the primary side of the contactless power transformer is provided on the ground and the secondary side is provided in a moving body, wherein the moving body in which the secondary side of the contactless power transformer is provided includes a first power converter having a function of converting a direct current into an alternating current and a function of converting the alternating current into the direct current, a secondary battery which is charged by the direct current converted by the first power converter, two capacitors which are interposed between the secondary battery and the first power converter, and a rotating electrical machine which is driven by the alternating current converted by the first power converter, the first power converter includes at least one of switching unit arms in which two switching units formed of a semiconductor switching element and a freewheeling diode are connected in series, and when the secondary battery is charged by the secondary-side alternating current output of the contactless power transformer, semiconductor switching elements of all switching units which constitute the first power converter are off, and a voltage-doubler rectifier is formed by a freewheeling diode of the two switching units which are connected in series and the two capacitors.