JPWO2021139996A5 - - Google Patents

Claims (19)

A receiver for wirelessly receiving power from a transmitter, the receiver comprising a resonant receiver circuit having a plurality of coils operably coupled to a coupling circuit;
each coil is arranged to receive power via resonant inductive coupling with the coupling circuit;
the combining circuit is configured to combine power received from the plurality of coils to supply an electrical load;
the combining circuit includes a plurality of power combiners, each power combiner comprising two input ports having the same basic configuration and coupled to an output port, and wherein the power combiner includes two input ports having the same basic configuration and receiving at both input ports at the output port. and wherein the plurality of power combiners are connected together to provide power received from each of the plurality of coils to an output of the combination circuit. combine into a combined power signal,
Each power combiner has a characteristic impedance,
each coil is coupled to the output of the coupling circuit by a combination of power couplers having characteristic impedances that couple together with that coil to form a resonant circuit for receiving power via resonant inductive coupling;
The plurality of power combiners are classified into a plurality of stages including a first stage, the number of first stage power combiners matches the number of coils of the plurality of coils, and each first stage power combiner associated with different coils of coils,
Each first stage power combiner has a first input port connected to a first end of the associated coil and a second input port connected to a second end of the associated coil. , said receiver. 2. The receiver of claim 1, wherein at least two coils of the plurality of coils are oriented at different angles to each other. The receiver according to claim 1 or 2, wherein at least two of the plurality of coils are configured to critically couple at different distances from each other. The combination circuit includes a plurality of impedance elements connected together to combine power received from each of the plurality of coils to provide a combined power signal to an output of the combination circuit. west,
Each coil is coupled to the output of the coupling circuit by a combination of impedance elements, the combination of impedance elements having a characteristic impedance that couples with that coil to form a resonant circuit for receiving power via resonant inductive coupling. The receiver according to any one of claims 1 to 3, comprising: The plurality of stages includes one or more previous stages, and for each previous stage, the number of power combiners in the previous stage is equal to the number of power combiners in the adjacent previous stage. Each power combiner of a matching half of the previous stage is associated with a power combiner of a different pair of said adjacent previous stages, and each power combiner of said adjacent previous stage is associated with a power combiner of a different pair of said adjacent previous stages. is associated with only a single power combiner of the preceding stage, each power combiner of a subsequent stage having a first 5. According to any one of claims 1 to 4 , there is a second input port connected to an input port and the output port of the other of the associated power combiner pair of the adjacent previous stage. Receiver as described. The connections between the plurality of power combiners in the combining circuit minimize the difference between the power signals provided at the first input port and the second input port of each power combiner. The receiver according to any one of claims 1 to 5, wherein the receiver is selected as follows. 7. A receiver as claimed in claim 6 when dependent on claim 5, wherein the power combiners from the adjacent previous stages are paired together based on their average power output. A receiver according to any preceding claim , wherein at least one of the power combiners is a Wilkinson power combiner. A receiver according to any one of the preceding claims , wherein at least one of the power combiners is formed from a microstrip electrical transmission line. A receiver according to any one of the preceding claims , further comprising an electrical load coupled to and receiving power from the coupling circuit. 11. The receiver of claim 10, wherein the electrical load comprises a rectifier for converting the power received from the coupling circuit into a direct current (DC) signal. 12. The receiver of claim 11, wherein the electrical load includes an electrosurgical device for generating and delivering electromagnetic energy to a treatment site around the receiver to treat biological tissue. The electrosurgical device includes:
a microwave power amplifier coupled to the rectifier for generating microwave electromagnetic energy from the DC signal;
and a transmission line coupled to the microwave power amplifier for delivering the microwave electromagnetic energy to biological tissue at the treatment site. 14. The receiver of claim 13, wherein the transmission line is configured to have an impedance that matches an impedance of target biological tissue within the treatment site. the electrical load includes a sensor for generating an electrical signal based on the environment of the receiver, the sensor being operably coupled to the rectifier to be powered by the DC signal; are operably coupled to the coupling circuit to provide the electrical signal, each coil having a resonant transmitting circuit arranged to transmit the electrical signal via resonant inductive coupling with the coupling circuit. 15. A receiver according to any one of claims 11 to 14, provided. The electrical load includes a signal conditioning unit operably coupled between the sensor and the coupling circuit, the signal conditioning unit being operable to change characteristics of the electrical signal prior to transmission. 16. The receiver according to claim 15. Capsule for ingestion by a patient, said capsule comprising a housing comprising a receiver according to any one of claims 1 to 16 . 18. The capsule of claim 17, wherein the housing is substantially spherical cylindrical in shape and the plurality of coils are arranged in a substantially elliptical manner following an inner surface of the housing. A wireless power transmission system, comprising:
a transmitter for wirelessly transmitting power, the transmitter comprising a resonant transmitter circuit having a coil arranged to wirelessly transmit power via resonant inductive coupling;
19. A wireless power transfer system comprising a receiver according to any one of claims 1 to 16, or a capsule according to claim 17 or 18, for wirelessly receiving power from the transmitter.