Patent ID: 8212415
Filing Date: 2012-07-03
Classification: H02J,H02M,Y02B

Abstract:
1. A noncontact electric power transmission system having a power transmitter circuit section and a power receiver circuit section which are adapted to be coupled to transmit electric power from a transmitter coil provided in the power transmitter circuit section to a receiver coil provided in the power receiver circuit section, in a noncontact manner by means of electromagnetic induction, the noncontact electric power transmission system comprising: a separately-excited or self-excited switching circuit provided in the power transmitter circuit section; a control IC operable to drive the switching circuit; an LC series resonant circuit including a capacitor connected in series to the transmitter coil or an LC parallel resonant circuit including a capacitor connected in parallel to the transmitter coil; and an LC parallel resonant circuit including a capacitor connected in parallel to the receiver coil, wherein an oscillating frequency (Fosc) of the control IC, a resonant frequency (Fpr) of the LC series resonant circuit or the LC parallel resonant circuit in the power transmitter circuit section, and a resonant frequency (Fsr) of the LC parallel resonant circuit in the power receiver circuit section, have the following relationship: Fpr<Fosc<Fsr.