Electric power supply apparatus, contactless electricity transmission apparatus, vehicle, and contactless electric power transfer system
AssigneesNippon Soken, Inc., Toyota Jidosha Kabushiki Kaisha
InventorsHiroyuki Sakakibara, Shinji Ichikawa
Life of this patent
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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.
Claims21
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.
A contactless electricity transmission apparatus that outputs electric power to an electricity reception apparatus in a contactless manner, the contactless electricity transmission apparatus comprising:
- 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.
A vehicle that outputs electric power to a load provided outside the vehicle in a contactless manner, the vehicle comprising:
- 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.
A contactless electric power transfer system comprising:
- 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.
Dependencies are inferred from the claim text.