US 5,428,521 A · Non-contact power supply apparatus

Abstract

OBJECT: To provide a non-contact power supply apparatus capable of supplying stable power very efficiently even when changes in load at the receiving side occur by tuning AC frequency supplied to the oscillating circuit on the receiving side and the resonant frequency of the resonance circuit on the receiving side. CONSTITUENTS: At the receiving side is provided a resonance circuit 3 in which resonance coil L3 on the receiving side is connected in parallel with resonance capacitor C3. At the supplying side are provided a detecting coil L2 which detects resonant frequency of resonance circuit 3 on the receiving side and a control means 1 which tunes AC frequency supplied to the aforementioned oscillating circuit 2 on the supplying side with resonant frequency of the aforementioned oscillating circuit 3 on the receiving side according to the frequency of induced electromotive force detected by said detecting coil L2.

Claims7

Dependent claims

A non-contact power supply apparatus for supplying power to a load, the apparatus comprising:

a power source having a positive electrode and a negative electrode;
a supplying oscillating circuit including a first coil and a second coil connected in series, the positive electrode of the power source being connected between the first coil and the second coil;
a receiving resonance coil electromagnetically coupled to the supplying oscillating circuit, the receiving resonance coil being connected to the load;
and
a frequency control circuit including a detecting coil electromagnetically coupled to the receiving resonance coil, and a switching circuit connected to the detecting coil for switching current direction in the first coil and the second coil in response to a voltage across the detecting coil;
wherein the voltage across the detecting coil changes in response to a magnetic flux produced by the receiving resonance coil.

3 more elements

Dependencies are inferred from the claim text.

Non-contact power supply apparatus

Life of this patent

Non-contact power supply apparatus

Life of this patent

Abstract

Claims7