High-efficiency power amplifier system for wireless power transmitters
First Claim
1. A device for providing wireless power comprising:
- a power supply;
a power amplifier coupled to the power supply, the power amplifier comprising;
a first switch and a second switch coupled to the power supply and to a common switch output,a first diode coupled between an output of the first switch and an input of the first switch, the first diode biased to enable current flow from the output to the input of the first switch,a second diode coupled between an output of the second switch and an input of the second switch, the second diode biased to enable current flow from the output to the input of the second switch; and
a pulse-width modulator (“
PWM”
) coupled to the power amplifier, the PWM configured to substantially simultaneously toggle each of the first and second switches between open and closed states, and to maintain the first and second switches in opposite open and closed states;
a controller coupled to the power supply and the PWM, the controller configured to;
receive a sensor signal indicating an impedance of a load;
determine a duty cycle of the PWM based on the sensor signal; and
adjust an output voltage of the power supply based on the duty cycle of the PWM.
1 Assignment
0 Petitions
Accused Products
Abstract
One example device for providing wireless power includes a power supply; a power amplifier coupled to the power supply, the power amplifier comprising a first switch and a second switch coupled to the power supply and to a common switch output, and a pulse-width modulator (“PWM”) coupled to the power amplifier, the PWM configured to substantially simultaneously toggle each of the first and second switches between open and closed states, and to maintain the first and second switches in opposite open and closed states; a controller coupled to the power supply and the PWM, the controller configured to: receive a sensor signal indicating an impedance of a load; determine a duty cycle of the PWM based on the sensor signal; and adjust an output voltage of the power supply based on the duty cycle of the PWM.
4 Citations
18 Claims
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1. A device for providing wireless power comprising:
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a power supply; a power amplifier coupled to the power supply, the power amplifier comprising; a first switch and a second switch coupled to the power supply and to a common switch output, a first diode coupled between an output of the first switch and an input of the first switch, the first diode biased to enable current flow from the output to the input of the first switch, a second diode coupled between an output of the second switch and an input of the second switch, the second diode biased to enable current flow from the output to the input of the second switch; and a pulse-width modulator (“
PWM”
) coupled to the power amplifier, the PWM configured to substantially simultaneously toggle each of the first and second switches between open and closed states, and to maintain the first and second switches in opposite open and closed states;a controller coupled to the power supply and the PWM, the controller configured to; receive a sensor signal indicating an impedance of a load; determine a duty cycle of the PWM based on the sensor signal; and adjust an output voltage of the power supply based on the duty cycle of the PWM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing wireless power comprising:
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receiving an indication of a load impedance; determining a duty cycle based on the load impedance; determining a power supply voltage based on the duty cycle; adjusting a power supply to supply the power supply voltage; toggling a first switch and a second switch between open and closed states to generate a power supply output, a ratio of the toggling based on the duty cycle, the first switch and the second switch switched to maintain them in opposite open or closed states, wherein a first diode is coupled between an output of the first switch and an input of the first switch and biased to circulate power from the output of the first switch and the input of the first switch, and wherein a second diode is coupled between an output of the second switch and an input of the second switch and biased to circulate power from the output of the second switch and the input of the second switch; and outputting the power supply output to a radio frequency (“
RF”
) transmit coil. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification