Resonant wireless power receiver circuit and control method thereof
AssigneeRichtek Technology Corporation
InventorsKuo-Chi Liu, Wei-Hsin Wei
Life of this patent
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Abstract
A resonant wireless power receiver circuit includes an adjustable impedance matching circuit and a receiver circuit, the impedance matching circuit and the receiver circuit in combination receive a wireless power and generate a resonant output. A rectifier is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit to rectify the resonant output to generate a rectified output. The impedance of the adjustable impedance matching circuit is controlled by a feedback control circuit such that the load impedance of rectified output is regulated at a pre-determined impedance value, or the voltage of the rectified output is regulated at a pre-determined voltage value.
Claims30
A resonant wireless power receiver circuit having a load impedance of rectified output, and configured to operably receive a wireless power and convert the wireless power to a DC conversion output which is supplied to a load, the resonant wireless power receiver circuit comprising:
- a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter;
- and
- a feedback control circuit, which is coupled to the rectifier and the adjustable impedance matching circuit, and configured to operably generate an impedance control signal according the rectified output voltage and the rectified output current, to control the impedance of the adjustable impedance matching circuit such that the load impedance of rectified output is regulated at a pre-determined impedance value.
A resonant wireless power receiver circuit, which has a load impedance of rectified output, and configured to operably receive a wireless power and convert the wireless power to a DC conversion output to a load, the resonant wireless power receiver circuit comprising:
- a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter;
- and
- a feedback control circuit, which is coupled to the adjustable impedance matching circuit, and configured to operably generate an impedance control signal according the rectified output voltage, to control the impedance of the adjustable impedance matching circuit such that the rectified output voltage is regulated at a pre-determined voltage value.
A feedback control circuit, which is configured to operably control a resonant wireless power receiver circuit which has a load impedance of rectified output, wherein the resonant wireless power receiver circuit is configured to operably receive a wireless power and convert the wireless power to a DC conversion output to a load, the resonant wireless power receiver circuit comprising a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- and a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter;
- the feedback control circuit being coupled to the rectifier and the adjustable impedance matching circuit, and comprising:
- a reference voltage generator, which is configured to operably generate a first reference voltage according to the rectified output current, wherein the first reference voltage corresponds to the product of the rectified output current multiplied by a pre-determined impedance value;
- and
- an impedance controller, which is configured to operably generate an impedance control signal according to the rectified output voltage and the first reference voltage, to control the impedance of the adjustable impedance matching circuit such that the rectified output voltage corresponds to the first reference voltage, to thereby regulate the load impedance of rectified output at the pre-determined impedance value.
A feedback control circuit, which is configured to operably control a resonant wireless power receiver circuit, wherein the resonant wireless power receiver circuit is configured to operably receive a wireless power and convert the wireless power to a DC conversion output to a load, the resonant wireless power receiver circuit comprising a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- and a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter;
- the feedback control circuit being coupled to the rectifier and the adjustable impedance matching circuit, and comprising:
- a first comparison circuit, which is configured to operably generate an error amplification signal according to the rectified output voltage and a first reference voltage;
- and
- an impedance controller, which is configured to operably generate an impedance control signal according to the error amplification signal, to control the impedance of the adjustable impedance matching circuit such that the rectified output voltage is regulated at a pre-determined voltage value.
A method for controlling a resonant wireless power receiver circuit which has a load impedance of rectified output, wherein the resonant wireless power receiver circuit is configured to operably receive a wireless power and convert the wireless power to a DC conversion output to a load, the resonant wireless power receiver circuit comprising a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- and a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter, the control method comprising:
- generating an impedance control signal according the rectified output voltage and the rectified output current;
- and
- controlling the impedance of the adjustable impedance matching circuit according to the impedance control signal, such that the load impedance of rectified output is regulated at a pre-determined impedance value.
A method for controlling a resonant wireless power receiver circuit which is configured to operably receive a wireless power and convert the wireless power to a DC conversion output to a load, the resonant wireless power receiver circuit comprising a receiver circuit, which includes at least a receiver coil;
- an adjustable impedance matching circuit, coupled to the receiver circuit, wherein the adjustable impedance matching circuit and the receiver circuit in combination are configured to operably receive the wireless power and generate a resonant output;
- a rectifier, which is coupled to the combination of the adjustable impedance matching circuit and the receiver circuit, and configured to operably rectify the resonant output to a rectified output, wherein the rectified output includes a rectified output voltage and a rectified output current;
- and a DC-DC converter, which is coupled to the rectifier and the load, and configured to operably convert the rectified output to the DC conversion output, wherein the DC conversion output includes a DC conversion output current, and wherein the load impedance of rectified output includes an input impedance of the DC-DC converter, the control method comprising:
- generating an impedance control signal according to the rectified output voltage;
- and
- controlling the impedance of the adjustable impedance matching circuit according to the impedance control signal, such that the rectified output voltage is regulated at a pre-determined voltage value.
Dependencies are inferred from the claim text.