DC to AC power conversion using a wireless power receiver
First Claim
1. A wireless power receiver, comprising:
- a resonant circuit comprising a power transfer receive element configured to wirelessly receive power via a magnetic field for providing power to a battery;
a first switching circuit coupled to the resonant circuit between the power transfer receive element and the battery, the first switching circuit configured to act as an inverter and generate a first signal, based on an output from the battery in a discharging mode, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency; and
a second switching circuit directly coupled to the resonant circuit between the power transfer receive element and the first switching circuit, wherein the resonant circuit is configured to, during the discharging mode of the battery, bias the second switching circuit at the resonant frequency in response to the first signal, wherein the second switching circuit is configured to perform rectification and is configured to extract the envelope to generate a second signal at half of the first frequency.
2 Assignments
0 Petitions
Accused Products
Abstract
In certain aspects, methods and systems for converting DC power to AC power by a wireless power receiver are disclosed. Certain aspects provide a wireless power receiver including a resonant circuit. The wireless power receiver includes a first switching circuit coupled to the resonant circuit, the first switching circuit configured to act as an inverter and generate a first signal, based on an output from a battery, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency. The wireless power receiver includes a second switching circuit coupled to the resonant circuit that is configured to bias the second switching circuit at the resonant frequency in response to the first signal, wherein the second switching circuit is configured to act as a rectifier and is configured to extract the envelope to generate a second signal at half of the first frequency.
7 Citations
30 Claims
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1. A wireless power receiver, comprising:
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a resonant circuit comprising a power transfer receive element configured to wirelessly receive power via a magnetic field for providing power to a battery; a first switching circuit coupled to the resonant circuit between the power transfer receive element and the battery, the first switching circuit configured to act as an inverter and generate a first signal, based on an output from the battery in a discharging mode, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency; and a second switching circuit directly coupled to the resonant circuit between the power transfer receive element and the first switching circuit, wherein the resonant circuit is configured to, during the discharging mode of the battery, bias the second switching circuit at the resonant frequency in response to the first signal, wherein the second switching circuit is configured to perform rectification and is configured to extract the envelope to generate a second signal at half of the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A controller for a wireless power receiver comprising a resonant circuit, the controller being configured to:
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control one or more switches of a first switching circuit coupled to the resonant circuit to act as an inverter and generate a first signal, based on an output from a battery in a discharging mode, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency; and control one or more switches of a second switching circuit coupled to the resonant circuit, between the first switching circuit and a power transfer receive element of the resonant circuit, to perform rectification and extract the envelope to generate a second signal at half of the first frequency during the discharging mode of the battery, wherein the resonant circuit biases the second switching circuit at the resonant frequency in response to the first signal. - View Dependent Claims (15, 16, 17, 18)
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19. A wireless power receiver apparatus, the apparatus comprising:
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a resonant circuit comprising a wireless power transfer element electrically coupled to one or more capacitors; a first power conversion circuit electrically coupled between the resonant circuit and a battery, the first power conversion circuit comprising one or more first switches; and a second power conversion circuit directly coupled to a node in between the resonant circuit and the first power conversion circuit, the second power conversion circuit comprising one or more second switches and configured to provide an AC output during a discharging mode of the battery. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for converting DC power to AC power by a wireless power receiver comprising a resonant circuit, the method comprising:
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controlling one or more switches of a first switching circuit coupled to the resonant circuit to act as an inverter and generate a first signal, based on an output from a battery in a discharging mode, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency; and controlling one or more switches of a second switching circuit coupled to the resonant circuit, between the first switching circuit and a power transfer receive element of the resonant circuit, to perform rectification and extract the envelope to generate a second signal at half of the first frequency during the discharging mode of the battery, wherein the resonant circuit biases the second switching circuit at the resonant frequency in response to the first signal. - View Dependent Claims (27, 28, 29, 30)
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Specification