# US 10,320,229 B2 · Auto-tunable wireless charger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,320,229 B2 - Document ID: US10320229B2 - Status: Granted - Kind: B2 - Application number: 15/152,946 - Filed: 2016-05-12 - Published: 2017-11-16 - Granted: 2019-06-11 - Earliest claimed: 2016-05-12 - Assignees: Honeywell International Inc. - Applicants: Honeywell International Inc. - Inventors: Glen Backes; Christian Larson - Web page: https://patentgrep.com/patent/US10320229B2 ## CPC - H02J 50/05: using capacitive coupling - H02J 7/70: characterised by the mechanical construction - H02J 7/875: {Charging or discharging for charge maintenance, battery initiation or rejuvenation} - H02J 50/10: using inductive coupling - H04B 5/22: Capacitive coupling - H04B 5/79: for data transfer in combination with power transfer - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H02J 2207/20: Charging or discharging characterised by the power electronics converter - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION ## Abstract Devices, methods, systems, and computer-readable media for an auto-tunable wireless charger are described herein. One or more embodiments include a tuner comprising a directional coupler connected between a frequency generator and a tuning cap to receive reflections on a transmit line of the directional coupler, and a controller coupled to the directional coupler and the tuning cap to monitor the reflections on the transmit line and to adjust the tuning cap based on the monitored reflections on the transmit line. ## Claims ### Claim 1 A tuner, comprising: a directional coupler connected between a frequency generator and a tuning cap to receive reflections on a transmit line of the directional coupler; a controller coupled to the directional coupler and the tuning cap to monitor the reflections on the transmit line and to adjust the tuning cap based on the monitored reflections on the transmit line; and a capacitive wireless power transfer device coupled to the tuning cap to transmit the monitored reflections on the transmit line to a wireless power receiving device. ### Claim 2 (depends on 1) The tuner of claim 1, wherein the controller is configured to determine a quantity of received reflections for a plurality of different states of the tuning cap. ### Claim 3 (depends on 1) The tuner of claim 1, wherein the controller is configured to adjust the tuning cap a plurality of times for a charging cycle. ### Claim 4 (depends on 3) The tuner of claim 3, wherein the wireless power receiving device provides a variable load to couple to the tuning cap for the charging cycle. ### Claim 5 (depends on 1) The tuner of claim 1, wherein the frequency generator generates a frequency between 100 megahertz (MHz) and 1 gigahertz (GHz). ### Claim 6 (depends on 1) The tuner of claim 1, wherein the controller is configured to adjust the tuning cap by altering impedance at an intersection between the tuning cap and the transmit line. ### Claim 7 (depends on 1) The tuner of claim 1, wherein the controller is configured to adjust the tuning cap during the charging cycle to minimize the reflections on the transmit line. ### Claim 8 (depends on 7) The tuner of claim 7, wherein the controller is configured to select an impedance level from the number of different impedance levels corresponding to a minimum quantity of reflections on the transmit line. ### Claim 9 A system for an auto-tunable wireless charger, comprising: a wireless charging device comprising: a frequency generator to generate a frequency within a frequency range; a directional coupler connected to the frequency generator to direct a first portion of the frequency to a capacitive wireless power transfer device and a second portion of the frequency to a controller; a tuning cap coupled to the capacitive wireless power transfer device and the controller to alter an impedance based on reflections on a transmit line of the directional coupler; and a device to receive a load from the wireless charging device. ### Claim 10 (depends on 9) The system of claim 9, wherein the load received by the device changes over a charging cycle of the wireless charging device. ### Claim 11 (depends on 10) The system of claim 10, wherein the changes of the load received by the device alters a quantity of the reflections on the transmit line. ### Claim 12 (depends on 9) The system of claim 9, wherein the wireless charging device alters transmit efficiency at specified times during the charging cycle of the wireless charging device. ### Claim 13 A system for an auto-tunable wireless charger, comprising: a wireless charging device comprising: a frequency generator to generate a frequency within a frequency range; a directional coupler connected to the frequency generator to direct a first portion of the frequency to a capacitive wireless power transfer device and a second portion of the frequency to a controller; and a tuning cap coupled to the capacitive wireless power transfer device and the controller to alter an impedance based on reflections on a transmit line of the directional coupler; a wireless receiving device comprising: a receiving antenna to receive the frequency from the capacitive wireless power transfer device during a charging cycle; a converter coupled to the receiving antenna to convert the frequency to electric current; and an electrical storage device coupled to the converter to receive the electric current, wherein a load corresponding to the electrical storage device changes throughout the charging cycle. ### Claim 14 (depends on 13) The system of claim 13, wherein the electrical storage device is a battery. ### Claim 15 (depends on 14) The system of claim 14, wherein a load corresponding to the electrical storage device changes as a charge level of the load associated with the receiving device changes. ### Claim 16 (depends on 15) The system of claim 15, wherein the controller executes instructions to monitor the reflections on the transmit line of the directional coupler to alter the state of the tuning cap based on the monitored reflections on the transmit line. ### Claim 17 (depends on 13) The system of claim 13, wherein the controller configured to: instruct the tuning cap to alter the impedance to a number of different impedance levels; and monitor the reflections on the transmit line of the directional coupler for each of the number of different impedance levels. ### Claim 18 (depends on 17) The system of claim 17, wherein the controller configured to select an impedance level from the number of different impedance levels with a threshold quantity of reflections on the transmit line based on the monitored reflections on the transmit line.