| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption of a circuit that suppresses overvoltage and requires much power consumption by storing an arithmetic equation that obtains a distance between an induction coil and a reception coil based on a self inductance, a mutual inductance and a detected current, calculating the distance based on the detected current and controlling a current flowing to the induction coil based on the calculated value thereby controlling the induced voltage of the reception coil. SOLUTION: At first, at application of power supply 2, a current flows to a power induction coil 3 via a resonance capacitor 51, a current detector 40 detects a primary current and a CPU 130 receives the detected current via an I/F 110. The CPU 130 calculates a distance between the induction coil 3 and a power reception coil 4 based on the received primary current according to an arithmetic equation stored in a RAM 120. The CPU 130 controls a voltage variable section 150 depending on the distance to vary a voltage of the power source 2 thereby controlling the primary current. Thus, an induced voltage in the power reception coil 4 from the power induction coil 3 is selected to be a proper range by controlling the primary current. |
