| 摘要 |
<P>PROBLEM TO BE SOLVED: To supply power efficiently and stably in a non-contact power supply system of a resonance type. <P>SOLUTION: The present invention relates to a power receiving device and non-contact power supply system having the power receiving device, where the power receiving device has: a resonance coil; an electromagnetic coupling coil; a rectifier circuit; a smoothing circuit; a voltage conversion circuit for converting a voltage value of direct current power to another voltage value; a control circuit which acquires the voltage value and a current value of the direct current power input to the voltage conversion circuit, calculates impedance from the acquired voltage value and current value, and generates a pulse width modulation signal for controlling output voltage and output current of the voltage conversion circuit; and a load to which the output voltage and output current of the voltage conversion circuit are input. A duty factor of the pulse width modulation signal is determined so that the impedance calculated by the control circuit is near to impedance at which transmission efficiency of transmitted alternating current power is to be a maximum value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
