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 said 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,wherein said power receiving device further includes a first control circuit that is coupled electrically to said resonant circuit, that is to be coupled electrically to the load, and that includes;
a first controller which is coupled electrically to said resonant circuit to detect the output voltage of said resonant circuit, which receives a reference voltage representing the open-circuit voltage, and which calculates and outputs a first control signal based on the reference voltage and the output voltage for controlling said resonant circuit to maintain resonance, anda second controller which is to be coupled electrically to the load to detect a load voltage across the load, which stores a preset voltage, which calculates a second control signal based on the load voltage and the preset voltage, and which is coupled electrically to said resonant circuit to output the second control signal thereto for controlling said resonant circuit such that the load voltage is substantially equal to the preset voltage.
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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
15 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 said 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, wherein said power receiving device further includes a first control circuit that is coupled electrically to said resonant circuit, that is to be coupled electrically to the load, and that includes; a first controller which is coupled electrically to said resonant circuit to detect the output voltage of said resonant circuit, which receives a reference voltage representing the open-circuit voltage, and which calculates and outputs a first control signal based on the reference voltage and the output voltage for controlling said resonant circuit to maintain resonance, and a second controller which is to be coupled electrically to the load to detect a load voltage across the load, which stores a preset voltage, which calculates a second control signal based on the load voltage and the preset voltage, and which is coupled electrically to said resonant circuit to output the second control signal thereto for controlling said resonant circuit such that the load voltage is substantially equal to the preset voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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 said 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, wherein said power receiving device includes; a first control circuit that is coupled electrically to said resonant circuit, that is to be coupled electrically to the load, and that includes; a first controller which detects the output voltage of said resonant circuit, which receives a reference voltage, and which calculates and outputs a first control signal based on the reference voltage and the output voltage for controlling said resonant circuit to maintain resonance, and a second controller which is for detecting a load voltage across the load, which stores a preset voltage, and which calculates and outputs a second control signal based on the load voltage and the preset voltage for controlling said resonant circuit such that the load voltage is substantially equal to the preset voltage; wherein said first control circuit further includes a reference voltage generator, capacitance and inductance of the series resonant LC circuit being set to enable an initial state of the output voltage to turn on said first control circuit such that said reference voltage generator is activated, said reference voltage generator being configured to; adjust one of the capacitance and the inductance of the series resonant LC circuit so as to vary the output voltage of said resonant circuit; receive the output voltage when the output voltage reaches a peak value, the output voltage being at the peak value when a resonant frequency of said resonant circuit corresponds to the operating frequency; and generate the reference voltage based on the output voltage thus received when the output voltage reaches the peak value.
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Specification