ELECTRIC POWER SUPPLY APPARATUS, CONTACTLESS ELECTRICITY TRANSMISSION APPARATUS, VEHICLE, AND CONTACTLESS ELECTRIC POWER TRANSFER SYSTEM
First Claim
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1. An electric power supply apparatus comprising:
- an amplifier circuit that includes a switching element whose parasitic capacitance is larger than a predetermined capacitance that is needed in order to realize class E zero-voltage switching; and
a compensation circuit that is connected in parallel with the switching element and that has inductive impedance.
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Accused Products
Abstract
An electric power supply apparatus includes a choke coil, a switching element, a resonance circuit and a compensation circuit. The parasitic capacitance of the switching element is larger than a predetermined capacitance needed for realizing class E zero-voltage switching. The compensation circuit is connected in parallel with the switching element. The compensation circuit includes a coil and a capacitor, and has inductive impedance.
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Citations
21 Claims
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1. An electric power supply apparatus comprising:
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an amplifier circuit that includes a switching element whose parasitic capacitance is larger than a predetermined capacitance that is needed in order to realize class E zero-voltage switching; and a compensation circuit that is connected in parallel with the switching element and that has inductive impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A contactless electricity transmission apparatus that outputs electric power to an electricity reception apparatus in a contactless manner, the contactless electricity transmission apparatus comprising:
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an electric powersupply portion that produces alternating-current power; and an electricity-transmitting resonance portion configured so that alternating-current power supplied from the electric power supply portion is output to an electricity-receiving resonance portion of the electricity reception apparatus in a contactless manner, wherein natural frequency of the electricity-transmitting resonance portion (30) is equal to the natural frequency of the electricity-receiving resonance portion, and wherein the electric power supply portion includes an amplifier circuit and a compensation circuit, the amplifier circuit including a switching element whose parasitic capacitance is larger than a predetermined capacitance that is needed in order to realize class E zero-voltage switching, and the compensation circuit being connected in parallel with the switching element and having inductive impedance. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A vehicle that outputs electric power to a load provided outside the vehicle in a contactless manner, the vehicle comprising:
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an electricity storage apparatus; an electric power supply portion that receives electric power from the electricity storage apparatus and produces alternating-current power; and a resonance portion configured to output the alternating-current power supplied from the electric power supply portion to an electricity-receiving resonance portion provided at a side of the load, in a contactless manner, wherein natural frequency of the resonance portion is the same as natural frequency of the electricity-receiving resonance portion, and wherein the electric power supply portion includes an amplifier circuit and a compensation circuit, the amplifier circuit including a switching element whose parasitic capacitance is larger than predetermined capacitance that is needed in order to realize class E zero-voltage switching, the compensation circuit being connected in parallel with the switching element and having inductive impedance.
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21. A contactless electric power transfer system comprising:
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an electricity reception apparatus that includes an electricity-receiving resonance portion; and an electricity transmission apparatus that includes an electric power supply portion and an electricity-transmitting resonance portion, the electric power supply portion producing alternating-current power, and the electricity-transmitting resonance portion being configured to output the alternating-current power supplied from the electric power supply portion to the electricity-receiving resonance portion in a contactless manner, wherein natural frequency of the electricity-receiving resonance portion is the same as natural frequency of the electricity-transmitting resonance portion, and wherein the electric power supply portion includes an amplifier circuit and a compensation circuit, the amplifier circuit including a switching element whose parasitic capacitance is larger than predetermined capacitance that is needed in order to realize class E zero-voltage switching, the compensation circuit being connected in parallel with the switching element and having inductive impedance.
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Specification