Power recovery circuit based on partial standing waves
View Patent ↗A power recovery system includes a transmission line that is coupled to transfer an RF signal received via an antenna. The RF signal generates a partial standing wave in the transmission line and the transmission line has at least one standing wave anti-node. A power recovery circuit converts an anti-node signal from the at least one standing wave anti-node to a power signal.
1. An integrated circuit comprising:
an antenna;
an RF receiver;
a transmission line, coupled to transfer an RF signal received via the antenna, the RF signal generating a partial standing wave in the transmission line, the transmission line having at least one standing wave anti-node;
an impedance matching circuit, coupled to the transmission line and the RF receiver, the impedance matching circuit having impedance matching characteristics that support the production of the partial standing wave having at least one peak; and
a power recovery circuit, coupled to the at least one standing wave anti-node that corresponds to the at least one peak, for converting an anti-node signal from the at least one standing wave anti-node to a power signal.
2. The power recovery system of claim 1 wherein the impedance matching circuit is responsive to a mode control signal to produce the partial standing wave in a power generation mode of operation.
3. The power recovery system of claim 2 wherein the impedance matching circuit presents the transmission line with at least one of: an impedance mismatch, a short circuit and an open circuit, in the power generation mode of operation.
4. The power recovery system of claim 2 wherein the impedance matching circuit is responsive to the mode control signal to presents the transmission line with an impedance match in a signal reception mode of operation.
5. The power recovery system of claim 4 wherein the power recovery circuit includes:
a power storage unit for storing power recovered from the anti-node signal; and
a processing module, coupled to the power storage unit, for generating the mode control signal.
6. The power recovery system of claim 5 wherein the processing module operates in response to a storage monitor signal from the power storage unit to detect a low power condition, and wherein the processing module generates the mode control signal to indicate the power generation mode of operation when the low power condition is detected.
7. The power recovery system of claim 1 wherein the power recovery circuit includes at least one rectifier circuit.
8. The power recovery system of claim 1 wherein the power recovery circuit includes a voltage multiplier circuit.
9. The power recovery system of claim 1 wherein the at least one standing wave anti-node includes a plurality of standing wave anti-nodes and wherein the power recovery circuit converts the anti-node signal from the plurality of standing wave anti-nodes to the power signal.
10. The power recovery system of claim 1 wherein the RF receiver is part of a millimeter wave backscattering transceiver.
11. A power recovery system for use in conjunction with an RF receiver, the power recovery system comprising:
a transmission line, coupled to transfer an RF signal received via an antenna, the RF signal generating a partial standing wave in the transmission line having at least one peak, the transmission line having at least one standing wave anti-node that corresponds to the at least one peak; and
a power recovery circuit, coupled to the at least one standing wave anti-node, for converting an anti-node signal from the at least one standing wave anti-node to a power signal.
12. The power recovery system of claim 11 further comprising:
an impedance matching circuit, coupled to the transmission line and the RF receiver, the impedance matching circuit having impedance matching characteristics that produce the partial standing wave.
13. The power recovery system of claim 12 wherein the impedance matching circuit is responsive to a mode control signal to produce the partial standing wave in a power generation mode of operation.
14. The power recovery system of claim 13 wherein the impedance matching circuit presents the transmission line with at least one of: an impedance mismatch, a short circuit and an open circuit, in the power generation mode of operation.
15. The power recovery system of claim 13 wherein the impedance matching circuit is responsive to the mode control signal to presents the transmission line with an impedance match in a signal reception mode of operation.
16. The power recovery system of claim 13 wherein the power recovery circuit includes:
a power storage unit for storing power recovered from the anti-node signal; and
a processing module, coupled to the power storage unit, for generating the mode control signal.
17. The power recovery system of claim 16 wherein the processing module operates in response to a storage monitor signal from the power storage unit to detect a low power condition, and wherein the processing module generates the mode control signal to indicate the power generation mode of operation when the low power condition is detected.
18. The power recovery system of claim 11 wherein the power recovery circuit includes at least one rectifier circuit.
19. The power recovery system of claim 11 wherein the power recovery circuit includes a voltage multiplier circuit.
20. A power recovery system for use in conjunction with an RF receiver, the power recovery system comprising:
a transmission line, coupled to transfer an RF signal received via an antenna, the RF signal generating a partial standing wave in the transmission line having a plurality of peaks, the transmission line having a plurality of standing wave anti-nodes that corresponds to the plurality of peaks; and
a power recovery circuit, coupled to the plurality of standing wave anti-nodes, for converting an anti-node signal between the plurality of standing wave anti-nodes to a power signal.