DEVICES, SYSTEMS, AND METHODS USING REACTIVE POWER INJECTION FOR ACTIVE TUNING ELECTRIC VEHICLE CHARGING SYSTEMS
First Claim
1. An apparatus for wirelessly transferring power via a magnetic field in a wireless power transfer system, the system including a receiver having a resonant receive circuit configured to inductively couple power via the magnetic field, a power conversion circuit of the receiver configured to adjust an amount of reactive power in the wireless power transfer system to maintain an output power substantially constant in response to changes in the power received due to variations in coupling, the apparatus comprising:
- an inverter circuit configured to output alternating electrical current;
a resonant transmit circuit comprising a coil electrically connected to a capacitive element, the resonant transmit circuit operably coupled to the inverter circuit and configured to generate the magnetic field in response to being driven with the alternating electrical current; and
a controller configured to;
receive a value indicative of an electrical characteristic of the inverter circuit; and
adjust an operating characteristic of the inverter circuit to trigger a change in an electrical current in the receive circuit, the amount of adjustment of the operating characteristic of the inverter selected by the controller to cause adjustment of an amount of reactive power in the wireless power transfer system based on changes in the power conversion circuit that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the resonant receive circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
Systems, methods, and apparatus are disclosed for wirelessly charging an electric vehicle. In one aspect, a method for transferring power via a magnetic field in a wireless power transfer system is provided. The method includes outputting an alternating electric current to a wireless power transmitter, generating, at the wireless power transmitter, the magnetic field in response to being driven with the alternating electrical current, receiving a value indicative of an electrical characteristic of the wireless power transmitter, and adjusting an operating characteristic of the wireless power transmitter to trigger a change in an electrical current in the receiver, the amount of adjustment selected to cause adjustment of an amount of reactive power in the wireless power transfer system based on changes in the receiver that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the receiver.
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Citations
30 Claims
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1. An apparatus for wirelessly transferring power via a magnetic field in a wireless power transfer system, the system including a receiver having a resonant receive circuit configured to inductively couple power via the magnetic field, a power conversion circuit of the receiver configured to adjust an amount of reactive power in the wireless power transfer system to maintain an output power substantially constant in response to changes in the power received due to variations in coupling, the apparatus comprising:
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an inverter circuit configured to output alternating electrical current; a resonant transmit circuit comprising a coil electrically connected to a capacitive element, the resonant transmit circuit operably coupled to the inverter circuit and configured to generate the magnetic field in response to being driven with the alternating electrical current; and a controller configured to; receive a value indicative of an electrical characteristic of the inverter circuit; and adjust an operating characteristic of the inverter circuit to trigger a change in an electrical current in the receive circuit, the amount of adjustment of the operating characteristic of the inverter selected by the controller to cause adjustment of an amount of reactive power in the wireless power transfer system based on changes in the power conversion circuit that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the resonant receive circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for wirelessly transferring power via a magnetic field in a wireless power transfer system, the system including a receiver having a resonant receive circuit configured to inductively couple power via the magnetic field, a power conversion circuit of the receiver configured to adjust an amount of reactive power in the wireless power transfers system to maintain an output power substantially constant in response to changes in the power received due to variations in coupling, the method comprising:
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outputting an alternating electric current to a wireless power transmitter; generating, at the wireless power transmitter, the magnetic field in response to being driven with the alternating electrical current; and receiving a value indicative of an electrical characteristic of the wireless power transmitter; and adjusting an operating characteristic of the wireless power transmitter to trigger a change in an electrical current in the receiver, the amount of adjustment of the operating characteristic of the wireless power transmitter selected to cause adjustment of an amount of reactive power in the wireless power transfer system based on changes in the receiver that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the receiver. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for wirelessly transferring power via a magnetic field in a wireless power transfer system, the system including a receiver having a resonant receive circuit configured to inductively couple power via the magnetic field, a power conversion circuit of the receiver configured to adjust an amount of reactive power in the wireless power transfers system to maintain an output power substantially constant in response to changes in the power received due to variations in coupling, the apparatus comprising:
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means for outputting an alternating electric current; means for generating the magnetic field in response to being driven with the alternating electrical current; and means for receiving a value indicative of an electrical characteristic of means for outputting the alternating electric current; and means for adjusting an operating characteristic of the means for outputting the alternating electric current to trigger a change in an electrical current in the receiver, the amount of adjustment of the operating characteristic of means for outputting the alternating electric current selected to cause adjustment of the amount of reactive power in the wireless power transfer system based on changes in the receiver that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the receiver. - View Dependent Claims (25, 26)
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27. A wireless power transfer system, comprising:
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a wireless power receiver comprising; a resonant receive circuit configured to inductively couple power via a magnetic field; a power conversion circuit having a switching network and configured to adjust an amount of reactive power in the wireless power transfers system in response to adjusting states of the switching network to maintain an output power substantially constant in response to changes in the power received due to variations in coupling; and a wireless power transmitter comprising; an inverter circuit configured to output alternating electrical current; a resonant transmit circuit comprising a coil electrically connected to a capacitive element, the resonant transmit circuit operably coupled to the inverter circuit and configured to generate the magnetic field in response to being driven with the alternating electrical current; and a controller configured to; receive a value indicative of an electrical characteristic of the inverter circuit; and adjust an operating characteristic of the inverter circuit to trigger a change in an electrical current in the receive circuit, the amount of adjustment of the operating characteristic of the inverter selected by the controller to cause adjustment of the amount of reactive power in the wireless power transfer system based on changes in the power conversion circuit that automatically occur to maintain the output power substantially constant in response to the change in the electrical current in the resonant receive circuit. - View Dependent Claims (28, 29, 30)
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Specification