Devices, systems, and methods for adjusting output power using synchronous rectifier control
First Claim
1. An apparatus for wirelessly receiving power, the apparatus comprising:
- a receive circuit configured to receive wireless power via a magnetic field sufficient to power or charge a load;
a tuning circuit comprising a variable reactive element, coupled to the receive circuit, and configured to detune the receive circuit away from a resonant frequency to adjust an output power level to a first output power level;
a rectifier electrically coupled to the receive circuit and configured to rectify an alternating current (AC) signal, generated in the receive circuit, to a direct current (DC) signal for supplying power to the load, the rectifier comprising a switch; and
a drive circuit configured to;
determine when a measured current value of the AC signal through the switch is equal to a first non-zero current value;
actuate the switch based on the determination that the measured current value of the AC signal through the switch is equal to the first non-zero current value; and
adjust the first non-zero current value to a second non-zero value to adjust the first output power level to a second output power level.
1 Assignment
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Accused Products
Abstract
In one aspect, an apparatus for wireless receiving power comprises a receive circuit configured to receive wireless power via a magnetic field sufficient to power or charge a load. The apparatus further comprises a tuning circuit comprising a variable reactive element, coupled to the receive circuit, and configured to detune the receive circuit away from a resonant frequency to adjust an output power level to a first output power level. The apparatus comprises a rectifier, comprising a switch, coupled to the receive circuit and configured to rectify an alternating current to a direct current for supplying power to the load. The apparatus comprises a drive circuit configured to actuate the switch when a current through the switch satisfies a first non-zero current value and adjust the first non-zero current value to a second non-zero value to adjust the first output power level to a second output power level.
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Citations
30 Claims
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1. An apparatus for wirelessly receiving power, the apparatus comprising:
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a receive circuit configured to receive wireless power via a magnetic field sufficient to power or charge a load; a tuning circuit comprising a variable reactive element, coupled to the receive circuit, and configured to detune the receive circuit away from a resonant frequency to adjust an output power level to a first output power level; a rectifier electrically coupled to the receive circuit and configured to rectify an alternating current (AC) signal, generated in the receive circuit, to a direct current (DC) signal for supplying power to the load, the rectifier comprising a switch; and a drive circuit configured to; determine when a measured current value of the AC signal through the switch is equal to a first non-zero current value; actuate the switch based on the determination that the measured current value of the AC signal through the switch is equal to the first non-zero current value; and adjust the first non-zero current value to a second non-zero value to adjust the first output power level to a second output power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of receiving wireless power, comprising:
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receiving, via a receive circuit, wireless power via a magnetic field sufficient to power or charge a load; detuning, via a variable reactive element coupled to the receive circuit, the receive circuit away from a resonant frequency to adjust an output power level to a first output power level; rectifying, via a rectifier, an alternating current (AC) signal generated by the magnetic field to a direct current (DC) signal for supplying power to the load, the rectifier comprising a switch; determining when a measured current value of the AC signal through the switch is equal to a first non-zero current value; actuating the switch based on the determination that the measured current value of the AC signal through the switch is equal to the first non-zero current value; and adjusting the first non-zero current value to a second non-zero value to adjust the first output power level to a second output power level. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. An apparatus for wirelessly receiving power, the apparatus comprising:
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means for receiving wireless power via a magnetic field sufficient to power or charge a load; means for detuning the receiving means away from a resonant frequency to adjust an output power level to a first output power level; means for rectifying an alternating current (AC) signal generated by the magnetic field to a direct current (DC) signal for supplying power to the load, the means for rectifying comprising means for switching; and means for driving the switching means, the driving means configured to; determine when a measured current value of the AC signal through the switching means is equal to a first non-zero current value, actuate the switching means based on the determination that the measured current value of the AC signal through the switching means is equal to the first non-zero current value, and adjust the first non-zero current value to a second non-zero value to adjust the first output power level to a second output power level. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification