POWER TRANSMITTER, RESONANCE-TYPE CONTACTLESS POWER SUPPLY AND CONTROL METHOD THEREFOR
First Claim
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1. A resonance-type contactless power supply comprising:
- an inverter circuit configured to receive electric energy and to generate a first AC current with a voltage strength parameter responding to an inverter control signal;
an impedance conversion network configured to receive said first AC current and to generate a second AC current with a current strength parameter corresponding to a voltage strength parameter of said first AC current;
a transmitter-side resonant circuit comprising a transmitting coil for receiving said second AC current;
a receiver-side resonant circuit comprising a receiving coil which is separated from but electrically coupled to said transmitting coil in a contactless manner, and configured to receive electric energy from said transmitting coil and to generate a third AC current; and
a control circuit configured to generate said inverter control signal for maintaining said current strength parameter of said second AC current to be m times of a current strength parameter of said third AC current, wherein m is a square root of a ratio of an equivalent resistance of said receiving coil to an equivalent resistance of said transmitting coil, said voltage strength parameter is a voltage peak or an effective value, and said current strength parameter is a current peak or an effective value.
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Abstract
The present disclosure relates to a power transmitter, a resonance-type contactless power supply and a control method. The inverter circuit is controlled to provide a high-frequency AC current with a voltage strength parameter so that a current strength parameter (e.g. a peak value or an effective value of the current) of the AC current flowing through a transmitting coil and that through a receiving coil have a predetermined relationship. Thus, an equivalent load impedance is adjusted so that the system efficiency is optimized.
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Citations
15 Claims
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1. A resonance-type contactless power supply comprising:
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an inverter circuit configured to receive electric energy and to generate a first AC current with a voltage strength parameter responding to an inverter control signal; an impedance conversion network configured to receive said first AC current and to generate a second AC current with a current strength parameter corresponding to a voltage strength parameter of said first AC current; a transmitter-side resonant circuit comprising a transmitting coil for receiving said second AC current; a receiver-side resonant circuit comprising a receiving coil which is separated from but electrically coupled to said transmitting coil in a contactless manner, and configured to receive electric energy from said transmitting coil and to generate a third AC current; and a control circuit configured to generate said inverter control signal for maintaining said current strength parameter of said second AC current to be m times of a current strength parameter of said third AC current, wherein m is a square root of a ratio of an equivalent resistance of said receiving coil to an equivalent resistance of said transmitting coil, said voltage strength parameter is a voltage peak or an effective value, and said current strength parameter is a current peak or an effective value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power transmitter being coupled to a power receiver comprising a receiving coil in a contactless manner and configured to provide electric energy, comprising:
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an inverter circuit configured to receive electric energy and to generate a first AC current with a voltage strength parameter responding to an inverter control signal; an impedance conversion network configured to receive said first AC current and to generate a second AC current with a current strength parameter corresponding to a voltage strength parameter of said first AC current; a transmitter-side resonant circuit comprising a transmitting coil which is coupled to said receiving coil in a contactless manner and configured to receive said second AC current; and a transmitter-side control circuit configured to generate an inverter control signal for maintaining a current strength parameter of said second AC current to be m times of a current strength parameter of said third AC current, wherein said third AC current flows through said receiving coil, m is a square root of a ratio of an equivalent resistance of said receiving coil to an equivalent resistance of said transmitting coil, said voltage strength parameter is a voltage peak or an effective value, and said current strength parameter is a current peak or an effective value. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A control method for controlling a resonance-type contactless power supply comprising an inverter, an impedance conversion network configured to receive an first AC current and to generate a second AC current with a current strength parameter corresponding to a voltage strength parameter of said first AC current, a transmitting coil and a receiving coil being coupled to each other in a contactless manner, comprising:
controlling said voltage strength parameter of said first AC current from said inverter circuit for maintaining said current strength parameter of said second AC current to be m times of a current strength parameter of a third AC current, wherein said third AC current flows through said receiving coil, m is a square root of a ratio of an equivalent resistance of said receiving coil to an equivalent resistance of said transmitting coil, said voltage strength parameter is a voltage peak or an effective value, and said current strength parameter is a current peak or an effective value. - View Dependent Claims (14, 15)
Specification