NONCONTACT POWER SUPPLY

摘要

PROBLEM TO BE SOLVED: To provide a noncontact power supply which is stabilized by reducing secondary voltage variation for variation in the gap length between primary and secondary coils through a simple arrangement while suppressing high frequency noise at a low cost. SOLUTION: The voltage resonance type noncontact power supply comprises a network K10 consisting of a resistor R12 connected between the source terminal of a switching element FET10 and the ground level, and a series circuit of a resistor R13 and a capacitor C12 connected in parallel with the resistor R12 with the middle point of connection between the resistor R13 and the capacitor C12 being connected with the base terminal of a transistor Q10 wherein the switching element FET10 is turned off by turning the transistor Q10 on and variation in the secondary voltage can be reduced for variation in the gap length between a primary coil L10 and a secondary coil L20 by setting the resistance of the resistor R13 appropriately. COPYRIGHT: (C)2005,JPO&NCIPI