Voltage regulation in wireless power receivers
First Claim
1. A wireless power receiver comprising:
- a circuit comprising a first tunable capacitor in parallel with an inductor, the wireless power receiver adapted to receive an induced voltage input (Vinduced) at the inductor due to a magnetic field generated by a wireless power transmitter, the wireless power receiver having an effective receiver resistance (Rreceiver);
a second tunable capacitor coupled in series with the circuit;
a rectifier coupled to the circuit, the rectifier having an output with a rectified voltage (Vrect) and a rectified current (Irect); and
a controller having a first input for receiving a first signal representative of the rectified voltage (Vrect) and a first output for supplying a first adjustment signal to the first tunable capacitor, the controller including a processor coupled to the first input and configured to;
operate on the first signal representative of the rectified voltage (Vrect) to produce a desired capacitance value (C2_desired) of the first tunable capacitor; and
provide the adjustment signal to adjust a first capacitance value (C2_value) of the first capacitor to the desired capacitance value (C2_desired);
wherein, to produce the desired capacitance value (C2_desired), the controller is configured to;
receive, at a second input of the controller, a second signal representative of the rectified current (Irect);
operate, in the processor, on the first signal and the second signal to determine a first power (PL) to a load coupled to the output of the rectifier and a resistance (RL) at the load;
operate, in the processor, on the effective receiver resistance (Rreceiver) and the first power (PL) to determine a second power (Preceiver) to the receiver; and
operate, in the processor, on the second power (Preceiver), the first capacitance value, and a second capacitance value of the second capacitor to determine an open circuit voltage value (Vopen), wherein the desired capacitance value (C2_desired) is a function of the open circuit voltage value (Vopen).
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Accused Products
Abstract
A wireless power receiver includes one or more tunable capacitors in parallel with an inductor. The wireless power receiver adapted to receive an induced voltage input at the inductor due to a magnetic field generated by a wireless power transmitter. The rectifier has an output with a rectified voltage and a rectified current. A controller has a first input for receiving a signal representative of the rectified voltage and a first output for supplying an adjustment signal to the tunable capacitor. The controller includes a processor coupled to the first input and is configured to operate on the signal representative of rectified voltage to produce a desired capacitance value for capacitor and provide the adjustment signal determined so as to adjust a capacitance value of capacitor to the desired capacitance value.
16 Citations
19 Claims
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1. A wireless power receiver comprising:
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a circuit comprising a first tunable capacitor in parallel with an inductor, the wireless power receiver adapted to receive an induced voltage input (Vinduced) at the inductor due to a magnetic field generated by a wireless power transmitter, the wireless power receiver having an effective receiver resistance (Rreceiver); a second tunable capacitor coupled in series with the circuit; a rectifier coupled to the circuit, the rectifier having an output with a rectified voltage (Vrect) and a rectified current (Irect); and a controller having a first input for receiving a first signal representative of the rectified voltage (Vrect) and a first output for supplying a first adjustment signal to the first tunable capacitor, the controller including a processor coupled to the first input and configured to; operate on the first signal representative of the rectified voltage (Vrect) to produce a desired capacitance value (C2_desired) of the first tunable capacitor; and provide the adjustment signal to adjust a first capacitance value (C2_value) of the first capacitor to the desired capacitance value (C2_desired); wherein, to produce the desired capacitance value (C2_desired), the controller is configured to; receive, at a second input of the controller, a second signal representative of the rectified current (Irect); operate, in the processor, on the first signal and the second signal to determine a first power (PL) to a load coupled to the output of the rectifier and a resistance (RL) at the load; operate, in the processor, on the effective receiver resistance (Rreceiver) and the first power (PL) to determine a second power (Preceiver) to the receiver; and operate, in the processor, on the second power (Preceiver), the first capacitance value, and a second capacitance value of the second capacitor to determine an open circuit voltage value (Vopen), wherein the desired capacitance value (C2_desired) is a function of the open circuit voltage value (Vopen). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for regulating rectified voltage (Vrect) in a system including a controller coupled to a wireless power receiver, the wireless power receiver including a rectifier coupled to a circuit, the circuit comprising a first tunable capacitor in parallel with an inductor, the wireless power receiver having an effective receiver resistance (Rreceiver), the rectifier having an output with the rectified voltage (Vrect) and a rectified current (Irect), the method comprising:
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receiving, at a first input of the controller, a first signal representative of the rectified voltage (Vrect), operating, in a processor coupled to the first input, on the first signal to produce a desired capacitance value (C2_desired) for the first capacitor; and providing, via a first output of the controller, a first adjustment signal to adjust a first capacitance value (C2_value) of the first capacitor to the desired capacitance value (C2_desired), wherein producing the desired capacitance value (C2_desired) further comprises; receiving, at a second input of the controller, a second signal representative of a rectified current (Irect); operating, in the processor, on the first signal and the second signal to determine a first power (PL) to a load coupled to the output of the rectifier and a resistance (RL) at the load; operating, in the processor, on the effective receiver resistance (Rreceiver) and the first power (PL) to determine a second power (Preceiver) to the receiver; and operating, in the processor, on the second power (Preceiver) to determine an open circuit voltage value (Vopen), wherein the desired capacitance value (C2_desired) is a function of the open circuit voltage value (Vopen). - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification