Patent ID: 9577474
Date: 2017-02-21
CPC Classifications: H02J,H03D,H04B

Claim:
1. A demodulator mounted on a wireless power transmitter that conforms to a Qi standard, and configured to demodulate an amplitude modulated signal superimposed on a coil current that flows through a primary coil of a transmission antenna, or otherwise on a coil voltage across both ends of the primary coil, the demodulator comprising: a plurality of demodulating units having respectively different demodulation characteristics, and each configured to operate in parallel, and to extract a modulated component from the coil current or otherwise from the coil voltage so as to generate a baseband signal as a demodulated signal; and a signal processing unit configured to employ a baseband signal that has been correctly received, selected from among the plurality of baseband signals generated by the multiple demodulating units based on an error detection result obtained using a checksum.