# US 11,451,098 B2 · Wireless power transmitter for high fidelity communications and high power transfer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,098 B2 - Document ID: US11451098B2 - Status: Granted - Kind: B2 - Application number: 17/316,239 - Filed: 2021-05-10 - Published: 2021-12-30 - Granted: 2022-09-20 - Earliest claimed: 2020-06-28 - Assignees: NuCurrent, Inc. - Applicants: NuCurrent, Inc. - Inventors: Alberto Peralta; Pavel Shostak - Web page: https://patentgrep.com/patent/US11451098B2 ## CPC - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J 50/12: of the resonant type - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract Wireless power transfer systems, disclosed, include one or more circuits to facilitate high power transfer at high frequencies. Such wireless power transfer systems include a damping circuit, configured to dampen a wireless power signal such that communications fidelity is upheld at high power. The damping circuit includes at least a damping transistor that is configured to receive, from the transmitter controller, a damping signal for switching the transistor to control damping during transmission of the wireless data signals. Utilizing such systems enables wireless power transfer at high frequency, such as 13.56 MHz, at voltages over 1 Watt, while maintaining fidelity of in-band communications associated with the higher power wireless power signal. ## Claims ### Claim 1 A wireless power transmission device comprising: a transmitter antenna configured to couple with at least one other antenna and transmit alternating current (AC) wireless signals to the at least one other antenna, the AC wireless signals including wireless power signals and wireless data signals; and an integrated circuit including: a transmitter controller that is configured to (i) provide a driving signal for driving the transmitter antenna based on an operating frequency for the wireless power transmission device and (ii) perform one or more of encoding the wireless data signals, decoding the wireless data signals, receiving the wireless data signals, or transmitting the wireless data signals, an amplifier including (i) at least one transistor that is configured to receive the driving signal at a gate of the at least one transistor and invert a direct power (DC) input power signal to generate the AC wireless signals at the operating frequency, and (ii) a damping circuit that is configured to dampen the AC wireless signals during transmission of the wireless data signals, wherein the damping circuit includes at least a damping transistor that is configured to receive, from the transmitter controller, a damping signal for switching the damping transistor to control damping during transmission of the wireless data signals. ### Claim 2 (depends on 1) The wireless power transmission device of claim 1, wherein the damping circuit is in electrical parallel connection with a drain of the at least one transistor. ### Claim 3 (depends on 1) The wireless power transmission device of claim 1, wherein the wireless data signals comprise in-band signals, and wherein the damping of the wireless data signals is configured to reduce one or both of rise or fall times in the wireless data signals, during in-band transmission of the wireless data signals. ### Claim 4 (depends on 3) The wireless power transmission device of claim 3, wherein the wireless data signals comprise in-band on-off-keying signals. ### Claim 5 (depends on 1) The wireless power transmission device of claim 1, wherein the damping signal is a substantially opposite signal of the wireless data signals. ### Claim 6 (depends on 1) The wireless power transmission device of claim 1, wherein the damping circuit further includes a damping resistor that is in electrical series with the damping transistor and is configured to dissipate at least some power from the wireless power signals. ### Claim 7 (depends on 1) The wireless power transmission device of claim 1, wherein the damping circuit further includes a damping capacitor that is in electrical series with, at least, the damping transistor. ### Claim 8 (depends on 1) The wireless power transmission device of claim 1, wherein the damping circuit further includes a diode that is in electrical series with, at least, the damping transistor and is configured to prevent power efficiency loss in the wireless power signals when the damping circuit is not active. ### Claim 9 (depends on 1) The wireless power transmission device of claim 1, further comprising a choke inductor connected between the DC input power signal and the at least one transistor. ### Claim 10 (depends on 1) The wireless power transmission device of claim 1, wherein the transmitter controller provides the damping signal to the damping transistor via a programmable pin of the transmitter controller. ### Claim 11 An integrated circuit for a wireless power transmitter, the wireless power transmitter configured to transmit alternating current (AC) wireless signals to a wireless power receiving system, the AC wireless signals including, at least, wireless power signals and wireless data signals, the integrated circuit comprising: an amplifier, the amplifier including: at least one transistor that is configured to receive a driving signal at a gate of the at least one transistor and invert a direct power (DC) input power signal to generate the AC wireless signals at an operating frequency for the wireless power transmitter, and a damping circuit that is configured to dampen the AC wireless signals during transmission of the wireless data signals, wherein the damping circuit includes at least a damping transistor that is configured to receive, from a transmitter controller, a damping signal for switching the damping transistor to control damping during transmission of the wireless data signals; and a filter circuit including, at least, a filter capacitor and a filter inductor, the filter circuit configured for optimization based on a filter quality factor. ### Claim 12 (depends on 11) The integrated circuit of claim 11, wherein the filter quality factor (γFILTER) is defined as γ FILTE ⁢ R = 1 R o ⁢ L o C o . ### Claim 13 (depends on 11) The integrated circuit of claim 11, wherein the damping circuit further includes a damping resistor that is in electrical series with the damping transistor and is configured to dissipate at least some power from the wireless power signals. ### Claim 14 (depends on 11) The integrated circuit of claim 11, wherein the damping circuit further includes a damping capacitor that is in electrical series with, at least, the damping transistor. ### Claim 15 (depends on 11) The integrated circuit of claim 11, wherein the damping circuit further includes a diode that is in electrical series with, at least, the damping transistor and is configured to prevent power efficiency loss in the wireless power signals when the damping circuit is not active. ### Claim 16 A listener for a Near-Field Communications Direct Charge (NFC-DC) system comprising: a transmitter antenna configured to couple with at least one other antenna and transmit alternating current (AC) wireless signals to the at least one antenna, the AC wireless signals including wireless power signals and wireless data signals; an integrated circuit including: a transmitter controller that is configured to (i) provide a driving signal for driving the transmitter antenna based on an operating frequency for the NFC-DC system and (ii) perform one or more of encoding the wireless data signals, decoding the wireless data signals, receiving the wireless data signals, or transmitting the wireless data signals; and an amplifier, the amplifier including: a transistor that is configured to receive the driving signal at a gate of the transistor and invert a direct current (DC) input power signal to generate the AC wireless signals at the operating frequency, and a damping circuit configured for damping the AC wireless signals during transmission of the wireless data signals, wherein the damping circuit includes, at least, a damping transistor configured to receive a damping signal from the transmitter controller, the damping signal configured to switch the damping transistor to control damping during transmission of the wireless data signals. ### Claim 17 (depends on 16) The listener of claim 16, wherein the operating frequency is in a range of about 13.553 MHz to about 13.567 MHz. ### Claim 18 (depends on 16) The listener of claim 16, wherein an output power of the wireless power signals is at a power greater than about 0.3 W. ### Claim 19 (depends on 18) The listener of claim 18, wherein the damping circuit is configured to damp the AC wireless signals such that when the wireless power signals are transmitted at greater than 1 W of wireless power, the wireless data signals are transmitted in accordance with standards established by the NFC-DC Draft Standard. ### Claim 20 (depends on 16) The listener of claim 16, wherein an output power of the wireless power signals is greater than 1 W.