Wireless power feeder and wireless power transmission system
AssigneeTDK Corporation
InventorTakashi URANO
Life of this patent
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Abstract
Power is fed from a feeding coil L2 to a receiving coil L3 by magnetic resonance. An oscillator 202 alternately turns ON/OFF switching transistors Q1 and Q2 to cause AC current IS of drive frequency fo to flow in a transformer T2 primary coil Lb. The AC current IS causes AC current I1 to flow in an exciting coil L1 and causes AC current I2 to flow in the feeding coil L2.
Claims13
A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
- a power transmission control circuit that includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed AC power to a first coil included in both the first and second current paths;
- the feeding coil;
- and
- an exciting circuit in which a second coil magnetically coupled to the first coil and an exciting coil magnetically coupled to the feeding coil are connected, wherein
- the exciting circuit receives AC power from the power transmission control circuit through the second coil and feeds the AC power to the feeding coil through the exciting coil.
A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
- a power transmission control circuit that includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed AC power to a first coil included in both the first and second current paths;
- and
- a feeding coil circuit in which the feeding coil, a capacitor, and a second coil are connected and resonates at the resonance frequency, wherein
- the feeding coil circuit receives AC power from the power transmission control circuit through the second coil magnetically coupled to the first coil.
Dependencies are inferred from the claim text.