# US 12,119,681 B2 · Wirelessly chargeable energy storage apparatuses having actively modifiable output voltages > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,681 B2 - Document ID: US12119681B2 - Status: Granted - Kind: B2 - Application number: 17/468,674 - Filed: 2021-09-08 - Published: 2021-12-30 - Granted: 2024-10-15 - Earliest claimed: 2017-03-31 - Assignees: Ossia Inc. - Applicants: Ossia Inc. - Inventors: Hatem Ibrahim Zeine; Benjamin Todd Renneberg - Web page: https://patentgrep.com/patent/US12119681B2 ## CPC - H02J 7/50: acting upon multiple batteries simultaneously or sequentially - H02J 7/04: Regulation of charging current or voltage - H02J 7/94: in response to battery current - H02J 50/20: using microwaves or radio frequency waves - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A circuit includes power reception circuitry to convert an RF signal to a direct current signal for transmission to an energy storage device and/or an electronic device associated with the circuit. The circuit includes voltage regulator circuitry to regulate an output voltage of the circuit based on an internal state thereof. A method incudes receiving, by at least one antenna, the RF signal. The method includes converting, by the circuit coupled to the antenna, the RF signal to a direct current signal. The method includes transmitting the DC signal to the energy storage device and/or the electronic device. The method includes determining the internal state of the circuit. The method includes regulating the output voltage of the circuit based on the internal state. Embodiments enable the addition of wireless charging functionality to existing electronic devices without extensive internal and/or external redesign. ## Claims ### Claim 1 A circuit comprising: power reception circuitry configured to convert a radio frequency signal to a direct current signal; and voltage regulator circuitry coupled to the power reception circuitry to receive the direct current, and configured to: induce, at a first node coupled to a second node by way of a resistor, a feedback voltage representative of an internal state of the circuit; and regulate an output voltage (VOUT) at the second node based on the feedback voltage. ### Claim 2 (depends on 1) The circuit of claim 1, wherein the voltage regulator circuitry is further configured to determine the internal state. ### Claim 3 (depends on 1) The circuit of claim 1 further comprising an energy storage device coupled to the power reception circuitry. ### Claim 4 (depends on 1) The circuit of claim 1, wherein the voltage regulator circuitry is further configured to generate an adjustment control signal based on the internal state. ### Claim 5 (depends on 4) The circuit of claim 4, wherein the adjustment control signal includes an adjustment voltage (VADJ). ### Claim 6 (depends on 5) The circuit of claim 5, wherein the voltage regulator circuitry comprises a resistor network to adjust the VOUT based on: the feedback voltage, and the VADJ. ### Claim 7 (depends on 1) The circuit of claim 1, wherein the internal state includes a charge state of an energy storage device. ### Claim 8 (depends on 1) The circuit of claim 1 further comprising contacts to electrically couple the circuit to an electronic device. ### Claim 9 (depends on 1) The circuit of claim 1 further comprising at least one antenna coupled to the power reception circuitry to receive the radio frequency signal. ### Claim 10 (depends on 9) The circuit of claim 9 further comprising a plurality of antennas including the at least one antenna. ### Claim 11 An apparatus comprising: an antenna for receiving a radio frequency (RF) signal; and a circuit coupled to the antenna, the circuit including: power reception circuitry coupled to the antenna and configured to convert the RF signal to a direct current signal; and voltage regulator circuitry coupled to the power reception circuitry to receive the direct current, and configured to: induce, at a first node coupled to a second node by way of a resistor, a feedback voltage representative of an internal state of the apparatus; and regulate an output voltage (VOUT) at the second node based on the feedback voltage. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the voltage regulator circuitry is further configured to determine the internal state. ### Claim 13 (depends on 11) The apparatus of claim 11 further comprising an energy storage device coupled to the circuit. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the voltage regulator circuitry is further configured to generate, based on the internal state, an adjustment control signal including an adjustment voltage (VADJ). ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the voltage regulator circuitry includes a resistor network to adjust the VOUT based on: the feedback voltage, and the VADJ. ### Claim 16 (depends on 11) The apparatus of claim 11, wherein the internal state includes a charge state of an energy storage device. ### Claim 17 (depends on 11) The apparatus of claim 11 further comprising a housing for containing at least a portion of the circuit. ### Claim 18 (depends on 17) The apparatus of claim 17 further comprising an energy storage device situated within the housing and coupled to the circuit. ### Claim 19 (depends on 11) The apparatus of claim 11 further comprising contacts to electrically couple the circuit to an electronic device. ### Claim 20 A method comprising: converting, by power reception circuitry, a radio frequency signal to a direct current signal; inducing, by voltage regulator circuitry coupled to the power reception circuitry to receive the direct current, and at a first node coupled to a second node by way of a resistor, a feedback voltage representative of an internal state of the circuit; and regulating an output voltage at the second node of the circuit based on the feedback voltage. ### Claim 21 (depends on 1) The circuit of claim 1, wherein the first node has four connections to it.