# US 12,184,095 B2 · Frequency shift keying demodulation for wireless power and related systems, methods, and devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,095 B2 - Document ID: US12184095B2 - Status: Granted - Kind: B2 - Application number: 17/445,298 - Filed: 2021-08-17 - Published: 2022-02-24 - Granted: 2024-12-31 - Earliest claimed: 2020-08-18 - Assignees: Microchip Technology Incorporated - Applicants: Microchip Technology Incorporated - Inventors: Mihnea Rosu-Hamzescu; Sergiu Oprea; Marius Dracea - Web page: https://patentgrep.com/patent/US12184095B2 ## CPC - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H04B 5/79: for data transfer in combination with power transfer - H02J 7/44: between battery management systems and power sources - H02J 50/10: using inductive coupling - 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 Frequency shift keying (FSK) demodulation for wireless power and related systems, methods, and devices is disclosed. An apparatus for a wireless power receiver includes a timing circuit and a processing core separate from the timing circuit. The timing circuit is to obtain a timer count every predetermined number of like edges of a frequency shift keying (FSK) wireless power signal. The FSK wireless power signal is to communicate data bits. The processing core is to determine the data bits of the FSK wireless power signal responsive to the obtained timer counts. ## Claims ### Claim 1 An apparatus for a wireless power receiver, the apparatus comprising: a multi-function peripheral including a timing circuit, the multi-function peripheral to selectively operate in a capture mode to obtain a timer count and trigger an interrupt to a processing core every predetermined number of like edges of a frequency shift keying (FSK) wireless power signal, the FSK wireless power signal to communicate data bits; and the processing core separate from the multi-function peripheral, the processing core to set the multi-function peripheral in the capture mode, read the obtained timer counts responsive to the triggered interrupts, and determine the data bits of the FSK wireless power signal responsive to the obtained timer counts. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the multi-function peripheral is selectively operable, responsive to the processing core, in the capture mode, a compare mode, and a pulse-width-modulation mode. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the multi-function peripheral is operable in the capture mode to generate the timer count. ### Claim 4 (depends on 2) The apparatus of claim 2, wherein the predetermined number of like edges of the FSK wireless power signal is sixteen. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the processing core samples respective obtained timer counts responsive to respective triggered interrupts. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the processing core is a processing core of a microcontroller of less than sixteen bits. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the microcontroller is an eight-bit microcontroller. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein a frequency of the FSK wireless power signal is between substantially 85 kilohertz and 205 kilohertz. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the FSK wireless power signal is encoded using a differential Manchester code. ### Claim 10 A method of operating a wireless power receiver, the method comprising: at a multi-function peripheral including a timing circuit, operating in a capture mode responsive to a setting from a processing core; receiving a frequency shift keying (FSK) wireless power signal from a wireless power transmitter, the FSK wireless power signal to communicate data bits; obtaining a timer count and triggering an interrupt to the processing core every predetermined number of like edges of the FSK wireless power signal; and providing the obtained timer counts to the processing core via the triggered interrupts; at the processing core, setting the multi-function peripheral to operate in the capture mode; reading the obtained timer counts responsive to the triggered interrupts; and determining the data bits of the FSK wireless power signal responsive to the obtained timer counts. ### Claim 11 A method of operating a wireless power receiver, the method comprising: setting, with a processing core, a peripheral to operate in a capture mode; receiving, with the peripheral, a measurement signal indicative of a frequency shift keying (FSK) wireless power signal from a wireless power transmitter; obtaining a timer count every predetermined number of like edges of the measurement signal; triggering, with the peripheral, an interrupt of the processing core for the every predetermined number of like edges of the measurement signal; reading, by the processing core responsive to a triggered interrupt, the obtained timer counts; and determining, by the processing core, a demodulated signal corresponding to the FSK wireless power signal responsive to the obtained timer counts. ### Claim 12 (depends on 11) The method of claim 11, wherein obtaining a timer count every predetermined number of like edges of the measurement signal comprises obtaining the timer count of a free running counter of the peripheral. ### Claim 13 (depends on 11) The method of claim 11, wherein the predetermined number of like edges of the measurement signal is sixteen. ### Claim 14 (depends on 11) The method of claim 11, wherein the peripheral is a multi-function peripheral selectively operable, responsive to the processing core, in a capture mode, a compare mode, and a pulse-width-modulation mode. ### Claim 15 A wireless power receiver, comprising: a receive coil to receive a frequency shift keying (FSK) wireless power signal from a wireless power transmitter, the FSK wireless power signal to communicate data bits; and a microcontroller electrically connected to the receive coil, the microcontroller including: a multi-function peripheral including a timing circuit, the multi-function peripheral to selectively operate in a capture mode to generate timing information and trigger an interrupt to a processing core every predetermined number of like edges of the FSK wireless power signal; and the processing core separate from the multi-function peripheral, the processing core to set the multi-function peripheral in the capture mode, read the generated timing information responsive to the triggered interrupts, and determine the data bits of the FSK wireless power signal responsive to the timing information. ### Claim 16 (depends on 15) The wireless power receiver of claim 15, wherein the multi-function peripheral is selectively operable, responsive to the processing core, in the capture mode, a compare mode, and a pulse-width-modulation mode. ### Claim 17 (depends on 15) The wireless power receiver of claim 15, wherein the microcontroller is an eight-bit microcontroller. ### Claim 18 (depends on 15) The wireless power receiver of claim 15, wherein the microcontroller is to control charging of a battery. ### Claim 19 (depends on 15) The wireless power receiver of claim 15, further comprising a synchronous buck converter, wherein the microcontroller is to control the synchronous buck converter. ### Claim 20 (depends on 15) The wireless power receiver of claim 15, wherein the microcontroller is configured to modulate a received wireless power signal using amplitude shift keying (ASK) to provide communications to the wireless power transmitter. ### Claim 21 (depends on 15) The wireless power receiver of claim 15, wherein the timing circuit includes a register to store the generated timing information regarding the predetermined number of like edges of the FSK wireless power signal.