CONTACTLESS INDUCTIVELY COUPLED POWER TRANSFER SYSTEM
First Claim
1. A contactless inductively coupled power transfer (ICPT) system comprising:
- a power supply device including a primary winding which is for generating an electromagnetic field in response to an alternating current (AC) current flow having a variable operating frequency; and
a power receiving device including a resonant circuit which is adapted to output an output voltage to a load according to induction of the electromagnetic field, and which includesa secondary winding that generates an open-circuit voltage according to induction of the electromagnetic field, the output voltage being associated with the open-circuit voltage, anda reactance element coupled electrically to said secondary winding and capable of forming a parallel resonant LC circuit with the secondary winding, the parallel resonant LC circuit resonating at the operating frequency, said reactance element being configured to form a series resonant LC circuit that resonates at the operating frequency, and that is to be connected in series to the load.
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Accused Products
Abstract
A contactless inductively coupled power transfer system includes a power supply device and a power receiving device. The power supply device includes a primary winding for generating an electromagnetic field (EMF) in response to an AC current flow having an operating frequency. The power receiving device includes a resonant circuit outputting an output voltage to a load and including a secondary winding and a reactance element. The reactance element is capable of forming a parallel resonant LC circuit with the secondary winding that resonates at the operating frequency, and forming a series resonant LC circuit that resonates at the operating frequency, and that is to be connected in series to the load.
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Citations
28 Claims
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1. A contactless inductively coupled power transfer (ICPT) system comprising:
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a power supply device including a primary winding which is for generating an electromagnetic field in response to an alternating current (AC) current flow having a variable operating frequency; and a power receiving device including a resonant circuit which is adapted to output an output voltage to a load according to induction of the electromagnetic field, and which includes a secondary winding that generates an open-circuit voltage according to induction of the electromagnetic field, the output voltage being associated with the open-circuit voltage, and a reactance element coupled electrically to said secondary winding and capable of forming a parallel resonant LC circuit with the secondary winding, the parallel resonant LC circuit resonating at the operating frequency, said reactance element being configured to form a series resonant LC circuit that resonates at the operating frequency, and that is to be connected in series to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A contactless inductively coupled power transfer (ICPT) system comprising:
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a power supply device including a rectifier circuit adapted for receiving an alternating current (AC) signal and converting the AC signal into a direct current (DC) signal, a frequency converter circuit coupled electrically to said rectifier circuit for receiving the DC signal and converting the DC signal into an AC current flow that has an operating frequency, a primary winding which is for generating an electromagnetic field in response to the AC current flow, an adjustment circuit coupled electrically between said frequency converter circuit and said primary winding, and including a first adjustable reactance member which is connected in series with said primary winding and which is controllable to adjust equivalent reactance of said first adjustable reactance member, and a control circuit coupled electrically to said first adjustable reactance member for adjusting the equivalent reactance thereof; and a power receiving device including a secondary winding that generates an open-circuit voltage according to induction of the electromagnetic field and that is adapted for supplying electric power associated with the open-circuit voltage to a load; wherein said power receiving device has input impedance when observed from said primary winding, the equivalent reactance of said first adjustable reactance member being adjusted so as to cancel out reactance of the input impedance. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification