Patent ID: 8674552
Filing Date: 2014-03-18
Classification: H02J

Abstract:
1. A contactless power reception circuit, comprising: a power reception part couplable with an adjacent electromagnetic field of a contactless power transmission circuit; a voltage rectifying part configured to rectify a voltage from the power reception part; a voltage transforming part configured to transform rectified voltage from the voltage rectifying part and supply the transformed voltage to a power reception load; and a load modulation part configured to change total impedance in the contactless power reception circuit by conducting load modulation while signals are transmitted to the contactless power transmission circuit, wherein the voltage transforming part includes a DCDC converter that transforms rectified voltage from the voltage rectifying part, a smoothing capacitor that smoothes the rectified voltage, and a backflow preventing device configured to prevent backflow of charge from the smoothing capacitor while the signals are transmitted.