Single switch modulation circuit and wireless charging receiver
A wireless charging receiver that provides power delivered from a transmitter over a 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. A wireless charging receiver for receiving RF power from a transmitter comprising:
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; and
an output circuit coupled to the rectifier circuit; and
in-band controller coupled to the LC circuit and the single switch modulation circuit operational to detect a reflected parameter from incident RF power;
wherein a resistance value of the single switch modulation circuit is set in response to a detected parametric value of the LC circuit; and
wherein the single switch modulation circuit is a transistor.
2. The wireless charging receiver of claim 1 wherein the resistance 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 power.
3. The wireless charging receiver of claim 1 wherein the resistance 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 power.
4. The wireless charging receiver of claim 1 wherein the resistance 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 power.
5. The wireless charging receiver of claim 1 wherein the output circuit is one of a switching voltage regulator, a linear voltage regulator, or a battery charger.
6. A wireless charging receiver for receiving RF power from a transmitter comprising:
a rectifier circuit;
an LC circuit coupled to the rectifier circuit and the transmitter; and
a single switch modulation circuit coupled to the rectifier circuit and the LC circuit;
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;
wherein a resistance value of the single switch modulation circuit is set in response to a detected parametric value of the LC circuit; and
wherein the single switch modulation circuit is a transistor.
7. The wireless charging receiver of claim 6 wherein the resistance 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 power.
8. The wireless charging receiver of claim 6 wherein the resistance 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 power.
9. The wireless charging receiver of claim 6 wherein the resistance 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 power.
10. The wireless charging receiver of claim 1 further comprising: an output circuit coupled to the rectifier circuit; wherein the output circuit is one of a switching voltage regulator, a linear voltage regulator, or a battery charger.
11. A wireless charging receiver for receiving RF power from a transmitter comprising:
a rectifier circuit;
an LC circuit coupled to the rectifier circuit and the transmitter;
a modulation circuit coupled to the rectifier circuit and the LC circuit; and
an output circuit coupled to the rectifier circuit; and
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;
wherein an on-state resistance value of the single switch modulation circuit is set in response to a detected parametric value of the LC circuit; and
wherein the single switch modulation circuit is a transistor.
12. The wireless charging receiver of claim 11 wherein the on-state resistance value is set to cause the rectifier circuit to generate one of: a stable voltage value with respect to a normal voltage value in response to the received RF power; an increased voltage value with respect to a normal voltage value in response to the received RF power; and a decreased voltage value with respect to a normal voltage value in response to the received RF power.
13. The wireless charging receiver of claim 11 wherein the output circuit is one of a switching voltage regulator, a linear voltage regulator, or a battery charger.
14. The wireless charging receiver of claim 11 wherein the modulation circuit is a single switch circuit.