# US 2015/0177293 A1 · Wireless charging performance measurement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0177293 A1 - Document ID: US20150177293A1 - Status: Published application - Kind: A1 - Application number: 14/138,480 - Filed: 2013-12-23 - Published: 2015-06-25 - Earliest claimed: 2013-12-23 - Assignees: Cambridge Silicon Radio Limited - Applicants: Cambridge Silicon Radio Limited - Inventors: Anthony Lawrence MCFARTHING - Web page: https://patentgrep.com/patent/US20150177293A1 ## CPC - H02J 7/50: acting upon multiple batteries simultaneously or sequentially - G01R 21/07: in circuits having distributed constants (G01R21/09 takes precedence) - H02J 7/80: including monitoring or indicating arrangements - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H04B 5/266: {One coil at each side, e.g. with primary and secondary coils} - H04B 5/79: for data transfer in combination with power transfer - H04Q 9/00: Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom - H04B 5/45: Transponders - H04Q 2209/40: using a wireless architecture - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H04B: TRANSMISSION - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract Wireless charging methods, chargers and devices are disclosed, including a method of measuring wireless charging performance comprising transmitting a wireless charging signal, measuring a transmitted power of the wireless charging signal, receiving an indication of a received power from the wireless charging signal received by a device, and determining wireless charging performance based on the transmitted power and the indication of the received power. ## Claims ### Claim 1 A method of measuring wireless charging performance comprising: transmitting a wireless charging signal; measuring a transmitted power of the wireless charging signal; receiving an indication of a received power from the wireless charging signal received by a device; and determining wireless charging performance based on the transmitted power and the indication of the received power. ### Claim 2 (depends on 1) The method of claim 1, wherein the indication of the received power is received from the device. ### Claim 3 (depends on 1) The method of claim 1, wherein determining the wireless charging performance comprises comparing the transmitted power and the indication of the received power. ### Claim 4 (depends on 1) The method of claim 1, wherein determining the wireless charging performance comprises determining at least one of a difference between the transmitted power and the received power and a ratio of the received power to the transmitted power. ### Claim 5 (depends on 4) The method of claim 4, further comprising stopping transmission of the wireless charging signal when the difference reaches or is greater than a predetermined threshold, or the ratio reaches or falls below a predetermined threshold. ### Claim 6 (depends on 1) The method of claim 1, further comprising stopping transmission of the wireless charging signal when the wireless charging performance is less than a predetermined level. ### Claim 7 (depends on 1) The method of claim 1, wherein measuring the transmitted power comprises measuring voltage and current of a signal provided to an antenna for transmitting the wireless charging signal, measuring a relative phase of the voltage and the current, and calculating the transmitted power based on the voltage, the current and the relative phase. ### Claim 8 (depends on 1) The method of claim 1, further comprising receiving one or more further indications of received power from the wireless charging signal received by each of one or more further devices, and wherein determining the wireless charging performance comprises determining the performance based on the transmitted power, the indication of the received power and the one or more further indications of received power. ### Claim 9 A wireless charging method comprising: receiving a wireless charging signal from a wireless charger; measuring a received power of the wireless charging signal; and transmitting an indication of the received power to the wireless charger. ### Claim 10 (depends on 9) The method of claim 9, wherein measuring the received power comprises measuring voltage and current of a signal received by an antenna for receiving the wireless charging signal, measuring a relative phase of the voltage and the current, and calculating the received power based on the voltage, the current and the relative phase. ### Claim 11 A wireless charger comprising: an antenna; a transmitter for transmitting a wireless charging signal using the antenna; measurement apparatus for measuring a transmitted power of the wireless charging signal; a receiver for receiving an indication of a received power from the wireless charging signal; and processing apparatus for determining wireless charging performance based on the transmitted power and the indication of the received power. ### Claim 12 (depends on 11) The wireless charger of claim 11, wherein the receiver is arranged to receive the indication of the received power from the device. ### Claim 13 (depends on 11) The wireless charger of claim 11, wherein the processing apparatus is arranged to determine the wireless charging performance by comparing the transmitted power and the indication of the received power. ### Claim 14 (depends on 11) The wireless charger of claim 11, wherein the processing apparatus is arranged to determine the wireless charging performance by determining at least one of a difference between the transmitted power and the received power and a ratio of the received power to the transmitted power. ### Claim 15 (depends on 14) The wireless charger of claim 14, wherein the processing apparatus is arranged to stop the transmitter from transmitting the wireless charging signal when the difference reaches or is greater than a predetermined threshold, or the ratio reaches or falls below a predetermined threshold. ### Claim 16 (depends on 11) The wireless charger of claim 11, wherein the processing apparatus is arranged to stop the transmitter from transmitting the wireless charging signal when the wireless charging performance is less than a predetermined level. ### Claim 17 (depends on 11) The wireless charger of claim 11, wherein the measuring apparatus comprises apparatus for measuring voltage and current of a signal provided to the antenna and measuring a relative phase of the voltage and the current. ### Claim 18 (depends on 17) The wireless charger of claim 17, wherein the processing apparatus is arranged to calculate the transmitted power based on the voltage, the current and the relative phase. ### Claim 19 (depends on 11) The wireless charger of claim 11, wherein the receiver is configured to receive one or more further indications of received power from the wireless charging signal received by each of one or more further devices, and wherein the processing apparatus is arranged to determining the wireless charging performance by determining the performance based on the transmitted power, the indication of the received power and the one or more further indications of received power. ### Claim 20 A wireless communications device comprising: a receiver for receiving a wireless charging signal from a wireless charger; measuring apparatus for measuring a received power of the wireless charging signal; and a transmitter for transmitting an indication of the received power to the wireless charger. ### Claim 21 (depends on 20) The device of claim 20, wherein the measuring apparatus comprises apparatus for measuring voltage and current of a signal provided to the antenna and measuring a relative phase of the voltage and the current. ### Claim 22 (depends on 21) The device of claim 21, further comprising processing apparatus for calculating the transmitted power based on the voltage, the current and the relative phase.