Regulation control and energy management scheme for wireless power transfer
First Claim
1. A system for wireless power transmission, said system comprising:
- a primary circuit including a grid converter and a primary coil located in a primary pad;
a secondary circuit located in a vehicle and comprising a secondary coil, a current rectification circuit connected to said secondary coil, and a battery connected to said current rectification circuit;
a battery management system configured to measure at least one parameter of said battery;
a vehicle-side communication means configured to transmit information on said at least one parameter of said battery, wherein said at least one parameter is a measure of an effective resistance of said battery as seen by said primary circuit;
an output voltage controller configured to control an alternating current (AC) output voltage of said grid converter based on information derived from said at least one parameter of said battery, wherein said information derived from said at least one parameter of said battery comprises a target value for each of one or more waveform parameters of said AC output voltage; and
a computation means configured to generate said one or more target values from said at least one parameter of said battery.
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Accused Products
Abstract
Power transfer rate at a charging facility can be maximized by employing a feedback scheme. The state of charge (SOC) and temperature of the regenerative energy storage system (RESS) pack of a vehicle is monitored to determine the load due to the RESS pack. An optimal frequency that cancels the imaginary component of the input impedance for the output signal from a grid converter is calculated from the load of the RESS pack, and a frequency offset f* is made to the nominal frequency f0 of the grid converter output based on the resonance frequency of a magnetically coupled circuit. The optimal frequency can maximize the efficiency of the power transfer. Further, an optimal grid converter duty ratio d* can be derived from the charge rate of the RESS pack. The grid converter duty ratio d* regulates wireless power transfer (WPT) power level.
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Citations
31 Claims
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1. A system for wireless power transmission, said system comprising:
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a primary circuit including a grid converter and a primary coil located in a primary pad; a secondary circuit located in a vehicle and comprising a secondary coil, a current rectification circuit connected to said secondary coil, and a battery connected to said current rectification circuit; a battery management system configured to measure at least one parameter of said battery; a vehicle-side communication means configured to transmit information on said at least one parameter of said battery, wherein said at least one parameter is a measure of an effective resistance of said battery as seen by said primary circuit; an output voltage controller configured to control an alternating current (AC) output voltage of said grid converter based on information derived from said at least one parameter of said battery, wherein said information derived from said at least one parameter of said battery comprises a target value for each of one or more waveform parameters of said AC output voltage; and a computation means configured to generate said one or more target values from said at least one parameter of said battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for wireless power transmission, said method comprising:
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providing a primary circuit including a grid converter and a primary coil located in a primary pad; providing a vehicle including a secondary circuit that comprises a secondary coil, a current rectification circuit connected to said secondary coil, a battery connected to said current rectification circuit, a battery management system configured to measure at least one parameter of said battery, a vehicle-side communication means configured to transmit information on said at least one parameter of said battery, wherein said at least one parameter is a measure of an effective resistance of said battery as seen by said primary circuit; and modifying an alternating current (AC) output voltage of said grid converter based on information derived from said at least one parameter of said battery, wherein said information derived from said at least one parameter of said battery comprises a target value for each of one or more waveform parameters of said AC output voltage, and wherein a computation means generate said one or more target values from said at least one parameter of said battery. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification