WIRELESS POWER FEEDER, WIRELESS POWER TRANSMISSION SYSTEM, AND TABLE AND TABLE LAMP USING THE SAME
First Claim
1. 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 feeds AC power to the feeding coil at the resonance frequency;
a feeding coil circuit that includes the feeding coil and a capacitor and resonates at the resonance frequency;
a control signal generation circuit that generates a control signal having a control frequency lower than the resonance frequency; and
a comparison circuit that generates an enable signal when a predetermined magnitude relationship is established between the level of the control signal and that of a reference signal, whereinthe power transmission control circuit feeds the AC power to the feeding coil under only while the enable signal is being generated.
1 Assignment
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Accused Products
Abstract
Power is fed from a feeding coil to a receiving coil by magnetic resonance. A drive circuit outputs an IN signal generated by an oscillator as a DR signal to alternately turn ON/OFF switching transistors at a resonance frequency, whereby AC current is fed to the feeding coil, and then the AC current is fed from the feeding coil to the receiving coil. An enable signal generation circuit generates an EN signal at a frequency lower than the resonance frequency. The drive circuit outputs the DR signal only while the EN signal assumes a high level. Transmission power from a wireless feeder to a wireless receiver is controlled by adjusting the duty ratio of the EN signal.
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Citations
7 Claims
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1. 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:
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a power transmission control circuit that feeds AC power to the feeding coil at the resonance frequency; a feeding coil circuit that includes the feeding coil and a capacitor and resonates at the resonance frequency; a control signal generation circuit that generates a control signal having a control frequency lower than the resonance frequency; and a comparison circuit that generates an enable signal when a predetermined magnitude relationship is established between the level of the control signal and that of a reference signal, wherein the power transmission control circuit feeds the AC power to the feeding coil under only while the enable signal is being generated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification