Non-contact power supply device
First Claim
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1. A non-contact power supply device, comprising:
- a power transmission coil;
a power transmission circuit switchably coupling a voltage source and the power transmission coil, the power transmission circuit configured to resonate at a fundamental frequency; and
a serial LC resonant circuit that includes a resonant inductor, is in parallel with the power transmission coil, and is configured to resonate at a frequency of a harmonic wave of the fundamental frequency,wherein electric power is supplied to a power reception coil from the power transmission coil through electromagnetic coupling, andthe serial LC resonant circuit and the power transmission coil constitute a closed loop circuit that does not include a resonant inductor other than the resonant inductor of the serial LC resonant circuit.
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Abstract
A non-contact power supply device, which supplies electric power to a power reception coil from a power transmission coil in a non-contact manner, includes a power transmission coil, a power transmission circuit switchably coupling a voltage source to the power transmission coil, the power transmission circuit configured to resonate at a fundamental frequency, and a serial LC resonant circuit in parallel with the power transmission coil, and configured to resonate at a frequency of a harmonic wave of the fundamental frequency. The non-contact power supply device suppresses a harmonic wave noise by providing a resonant circuit that resonates at a specific harmonic wave.
20 Citations
20 Claims
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1. A non-contact power supply device, comprising:
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a power transmission coil; a power transmission circuit switchably coupling a voltage source and the power transmission coil, the power transmission circuit configured to resonate at a fundamental frequency; and a serial LC resonant circuit that includes a resonant inductor, is in parallel with the power transmission coil, and is configured to resonate at a frequency of a harmonic wave of the fundamental frequency, wherein electric power is supplied to a power reception coil from the power transmission coil through electromagnetic coupling, and the serial LC resonant circuit and the power transmission coil constitute a closed loop circuit that does not include a resonant inductor other than the resonant inductor of the serial LC resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-contact power supply device, comprising:
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a power source; a power transmission coil configured to supply electric power in a non-contact state; a power transmission circuit switchably coupling the power source and the power transmission coil, the power transmission circuit including a choke coil that is connected to the power source, a switching element that is connected to the choke coil, a first capacitor that is connected in parallel with the switching element, a second capacitor that is connected between the power transmission coil and a contact point between the switching element and the choke coil, and a resonance circuit in which the first and second capacitors and the power transmission coil resonate at a fundamental frequency; and a serial LC resonant circuit in parallel with the power transmission coil, the serial LC resonant circuit configured to resonate at a frequency of a harmonic wave of the fundamental frequency, wherein electric power is supplied to a power reception coil from the power transmission coil through electromagnetic coupling. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of non-contact power transmission from a power transmission coil to a power reception coil, wherein a serial LC resonant circuit is connected in parallel with the power transmission coil, the method comprising:
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operating a power transmission circuit to switchably couple a power source and the power transmission coil, the power transmission circuit resonating at a fundamental frequency causing the serial LC resonant circuit to resonate at a frequency of a harmonic wave of the fundamental frequency; and supplying electric power from the power transmission coil to the power reception coil through electromagnetic coupling, wherein the serial LC resonant circuit includes a resonant inductor, and the serial LC resonant circuit and the power transmission coil constitute a closed loop circuit that does not include a resonant inductor other than the resonant inductor of the serial LC resonant circuit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification