Soft switched single stage wireless power transfer
First Claim
Patent Images
1. A wireless power transmission circuit comprising:
- a voltage source having first and second output terminals;
a first solid-state switch having a pair of first power terminals and a first gate terminal, the pair of first power terminals connected between the first output terminal and a switch node;
a second solid-state switch having a pair of second power terminals and a second gate terminal, the pair of second power terminals connected between the switch node and the second output terminal;
an antenna network coupled to the switch node and configured to transmit electrical energy at a first frequency;
a resonant circuit coupled to the switch node and configured to resonate at a second frequency that is lower than the first frequency;
an AC voltage divider circuit coupled to the resonant circuit and configured to reduce an AC voltage supplied the antenna network; and
a controller coupled to the first and the second gate terminals configured to operate the first and the second solid-state switches such that they regulate power from the voltage source to drive the antenna network at the first frequency that interacts with the resonant circuit creating phase shifted voltage and current signals at the switch node, enabling the first and the second solid-state switches to operate with zero voltage switching.
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Abstract
A control scheme and architecture for a wireless electrical energy transmission circuit employs two solid-state switches and a zero voltage switching (ZVS) topology to power an antenna network. The switches drive the antenna network at its resonant frequency and simultaneously energize a separate resonant circuit that has a resonant frequency lower than the antenna circuit. The resonant circuit creates out of phase voltage and current waveforms that enable the switches to operate with (ZVS).
51 Citations
19 Claims
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1. A wireless power transmission circuit comprising:
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a voltage source having first and second output terminals; a first solid-state switch having a pair of first power terminals and a first gate terminal, the pair of first power terminals connected between the first output terminal and a switch node; a second solid-state switch having a pair of second power terminals and a second gate terminal, the pair of second power terminals connected between the switch node and the second output terminal; an antenna network coupled to the switch node and configured to transmit electrical energy at a first frequency; a resonant circuit coupled to the switch node and configured to resonate at a second frequency that is lower than the first frequency; an AC voltage divider circuit coupled to the resonant circuit and configured to reduce an AC voltage supplied the antenna network; and a controller coupled to the first and the second gate terminals configured to operate the first and the second solid-state switches such that they regulate power from the voltage source to drive the antenna network at the first frequency that interacts with the resonant circuit creating phase shifted voltage and current signals at the switch node, enabling the first and the second solid-state switches to operate with zero voltage switching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a wireless power transmission circuit, the method comprising:
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supplying power to the circuit with a voltage source having a first and a second output terminal; transmitting a first gate control signal to a first driver circuit, in response the first driver circuit transmitting a first gate drive signal to a gate of a first solid-state switch, the first solid-state switch having a pair of first power terminals connected between the first output terminal and a switch node; transmitting a second gate control signal to a second driver circuit, in response the second driver circuit transmitting a second gate drive signal to a gate of a second solid-state switch, the second solid-state switch having a pair of second power terminals connected between the second output terminal and the switch node; operating a controller that transmits the first and the second gate control signals such that the first and second solid-state switches turn on and off at a first frequency, regulating AC voltage delivered to the switch node; energizing a resonant circuit coupled to the switch node such that the resonant circuit resonates at a second frequency creating phase shifted voltage and current signals at the switch node that enable the first and the second solid-state switches to operate with zero voltage switching; dividing the AC voltage delivered to the switch node with an AC voltage divider circuit coupled to the resonant circuit, such that a reduced AC voltage is created; and driving an antenna network coupled to the voltage divider, with the reduced AC voltage from the AC voltage divider circuit, at the first frequency such that electrical energy is radiated from the antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification