Single switch modulation circuit and wireless charging receiver

Abstract

A wireless charging receiver that provides power delivered from a transmitter over an wireless path. The receiver includes a rectifier circuit, an LC circuit coupled to the rectifier circuit and the transmitter, a single switch modulation circuit coupled to the rectifier circuit and the LC circuit, an output circuit coupled to the rectifier circuit. The receiver further comprises an in-band controller coupled to the LC circuit and the single switch modulation circuit operational to detect a reflected parameter from incident RF power. A resistance value of the single switch modulation circuit can be set in response to a detected parametric value of the LC circuit. The resistance value can be set to cause the rectifier circuit to generate one of a stable RDCV value, an increased RDCV value, and a decreased RDCV value with respect to a normal PDC value in response to the received RF power.

1 - 20 . (canceled) 
     
     
         21 . A system comprising:
 a rectifier circuit;   a first circuit having a resonant frequency coupled to the rectifier circuit and the transmitter;   a modulation circuit coupled to the rectifier circuit and the first circuit; and   an output circuit coupled to the rectifier circuit;   an in-band controller coupled to the first circuit and the modulation circuit operational to detect a reflected parameter from an incident RF signal; and   wherein an impedance value of the modulation circuit is set in response to a detected parametric value of the first circuit, and the modulation circuit comprises a transistor.   
     
     
         22 . The system of  claim 21  wherein the impedance value causes the rectifier circuit to generate a stable voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         23 . The system of  claim 21  wherein the impedance value is set to cause the rectifier circuit to generate a stable voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         24 . The system of  claim 21  wherein the impedance value causes the rectifier circuit to generate an increased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         25 . The system of  claim 21  wherein the impedance value is set to cause the rectifier circuit to generate an increased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         26 . The system of  claim 21  wherein the impedance value is set to cause the rectifier circuit to generate a decreased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         27 . The system of  claim 21  wherein the output circuit is one of a switching voltage regulator, a linear voltage regulator, or a battery charger. 
     
     
         28 . A system comprising:
 a rectifier circuit;   a first circuit having a resonant response characteristic coupled to the rectifier circuit and the transmitter; and   a modulation circuit coupled to the rectifier circuit and the first circuit;   a controller coupled to the first circuit and the modulation circuit configured to detect a reflected parameter from an incident RF signal;   wherein an impedance value of the modulation circuit is set in response to a detected parametric value of the first circuit and the modulation circuit comprises a transistor.   
     
     
         29 . The system of  claim 28  wherein the impedance value causes the rectifier circuit to generate a stable voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         30 . The system of  claim 28  wherein the impedance value is set to cause the rectifier circuit to generate a stable voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         31 . The system of  claim 28  wherein the impedance value causes the rectifier circuit to generate an increased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         32 . The system of  claim 28  wherein the impedance value is set to cause the rectifier circuit to generate an increased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         33 . The system of  claim 28  wherein the impedance value is set to cause the rectifier circuit to generate a decreased voltage value with respect to a normal voltage value in response to the received RF signal. 
     
     
         34 . The system of  claim 28  further comprising:
 an output circuit coupled to the rectifier circuit; 
 wherein the output circuit is a power control circuit. 
 
     
     
         35 . A system comprising:
 a rectifier circuit;   a first circuit having at least one resonance parameter coupled to the rectifier circuit and the transmitter;   a modulation circuit coupled to the rectifier circuit and the first circuit;   an output circuit coupled to the rectifier circuit;   a controller coupled to the first circuit and the modulation circuit operational to detect a parameter from an RF signal; and   wherein an on-state impedance of the single switch modulation circuit is set in response to a detected parametric value of the first circuit and the modulation circuit comprises a transistor.   
     
     
         36 . The system of  claim 35  wherein the on-state impedance causes the rectifier circuit to generate a stable voltage value with respect to a normal voltage value in response to the RF signal. 
     
     
         37 . The system of  claim 35  wherein the on-state impedance causes the rectifier circuit to generate an increased voltage value with respect to a normal voltage value in response to the RF signal. 
     
     
         38 . The system of  claim 35  wherein the on-state impedance causes the rectifier circuit to generate a decreased voltage value with respect to a normal voltage value in response to the RF signal. 
     
     
         39 . The system of  claim 35  wherein the output circuit is one of a switching voltage regulator, a linear voltage regulator, or a battery charger. 
     
     
         40 . The system of  claim 35  wherein the modulation circuit comprises a single switch circuit.