# US 2021/0242723 A1 · Dual-Mode Energy Harvesting Wireless Power Receiver Apparatus With Self-Reviving Capabilities > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242723 A1 - Document ID: US20210242723A1 - Status: Published application - Kind: A1 - Application number: 17/238,463 - Filed: 2021-04-23 - Published: 2021-08-05 - Earliest claimed: 2017-03-31 - Assignees: Ossia Inc. - Applicants: Ossia Inc. - Inventors: Hatem Ibrahim Zeine; Benjamin Todd Renneberg - Web page: https://patentgrep.com/patent/US20210242723A1 ## CPC - H02J 50/001: {Energy harvesting or scavenging} - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - 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 Embodiments of the present disclosure describe systems, methods, and apparatuses for reviving a wireless power receiver client over-the-air. More specifically, dual-mode active/passive wireless power receiver clients are described that can passively harvest RF energy in order to obtain enough energy to rejoin a wireless power network where the client can actively harvest RF energy (the client receives directed or isolated wireless power from a wireless power transmission system). For example, a wireless power receiver client can harvest RF energy while idle or off, e.g., when no beacon or other communications are being sent or received, or, in some instances, asynchronously in order to compliment and/or protect one or more elements of the system such as, for example a radio transceiver. ## Claims ### Claim 1 A dual-mode wireless power receiver apparatus comprising: one or more radio frequency (RF) transceivers; an active energy harvesting component operable to: direct the one or more RF transceivers to establish a connection with a wireless power transmission system; transmit a beacon signal to the wireless power transmission system; responsive to the beacon signal, receive and process directed wireless power transmitted by the wireless power transmission system via one or more paths; and store the received wireless power in an energy storage device; a passive energy harvesting component operable to harvest and store ambient energy in the energy storage device; and switching circuitry operable to enable the active energy harvesting component during an active harvest mode and enable the passive energy harvesting component during a passive harvest mode. ### Claim 2 (depends on 1) The dual-mode wireless power receiver apparatus of claim 1, wherein the switching circuitry comprises a switch operable to enable the passive energy harvesting component or the active energy harvesting component. ### Claim 3 (depends on 2) The dual-mode wireless power receiver apparatus of claim 2, wherein the switching circuitry comprises control circuitry operable to determine a mode of the dual-mode wireless power receiver apparatus. ### Claim 4 (depends on 3) The dual-mode wireless power receiver apparatus of claim 3, wherein the control circuitry is further operable to enable the active harvest mode when the dual-mode wireless power receiver apparatus is in an idle state or an active state. ### Claim 5 (depends on 3) The dual-mode wireless power receiver apparatus of claim 3, wherein the control circuitry is further operable to enable the active harvest mode when the dual-mode wireless power receiver apparatus is in an active state and enable the passive harvest mode when the dual-mode wireless power receiver apparatus is in an idle state. ### Claim 6 (depends on 3) The wireless power receiver apparatus of claim 3, wherein the control circuitry comprises a monitor operable to: determine when power stored in the energy storage device is less than an active power threshold; and responsively direct the dual-mode wireless power receiver apparatus to a low-power state, wherein the passive harvest mode is enabled in the low-power state. ### Claim 7 (depends on 6) The dual-mode wireless power receiver apparatus of claim 6, wherein, while in the low-power state, the monitor is further operable to determine when the power stored in the energy storage device meets or exceeds a wake-up power threshold. ### Claim 8 (depends on 7) The dual-mode wireless power receiver apparatus of claim 7, wherein, when the energy stored in the energy storage device meets or exceeds the wake-up power threshold, the control circuitry is further operable to direct the dual-mode wireless power receiver apparatus to wake-up. ### Claim 9 (depends on 7) The dual-mode wireless power receiver apparatus of claim 7, wherein the control circuitry is further operable to detect one or more successive failed wake-up attempts and responsively adjust the wake-up power threshold. ### Claim 10 (depends on 2) The dual-mode wireless power receiver apparatus of claim 2, wherein the switching circuitry comprises a peak detector circuit operable to bias the switch to connect to a primary rectification circuit of the active energy harvesting component when directed wireless power from the wireless power transmission system is received. ### Claim 11 A dual-mode wireless power receiver apparatus comprising: peak detector circuitry communicatively coupled with one or more antennas and operable to detect presence of a radio frequency (RF) field; one or more active energy harvesting components enabled when the RF field is greater than an ambient threshold, the one or more active energy harvesting components operable to: receive and process directed wireless power from a wireless power transmission system via one or more paths; and store the received wireless power in an energy storage device; and one or more passive energy harvesting components enabled when the RF field is less than the ambient threshold, the one or more passive energy harvesting components operable to harvest and store ambient energy in the energy storage device. ### Claim 12 (depends on 11) The dual-mode wireless power receiver apparatus of claim 11 further comprising the one or more antennas. ### Claim 13 (depends on 11) The dual-mode wireless power receiver apparatus of claim 11 further comprising a radio operable to: direct the one or more antennas to establish a connection with the wireless power transmission system; and transmit a beacon signal to the wireless power transmission system, wherein the directed wireless power is received responsive to the beacon signal. ### Claim 14 (depends on 13) The dual-mode wireless power receiver apparatus of claim 13 further comprising an RF switch operable to enable a primary rectification circuit or the radio. ### Claim 15 (depends on 14) The dual-mode wireless power receiver apparatus of claim 14, wherein to enable the one or more active energy harvesting components, the peak detector circuit is operable to bias the RF switch to connect to the primary rectification circuit when directed wireless power from the wireless power transmission system is received. ### Claim 16 (depends on 11) The dual-mode wireless power receiver apparatus of claim 11 further comprising one or more matching circuits. ### Claim 17 (depends on 16) The dual-mode wireless power receiver apparatus of claim 16, wherein the matching circuits are dynamically tunable. ### Claim 18 A method for operating a dual-mode wireless power receiver client, the method comprising: detecting that a power level of an energy storage device of the dual-mode wireless power receiver client is less than an active power threshold value; responsive to the power level being less than the active power threshold value, directing the dual-mode wireless power receiver client to transition to a low-power state; in the low-power state, harvesting and storing ambient energy in the energy storage device; detecting that the power level of the energy storage device exceeds a wake-up power threshold value; and responsive to the power level of the energy storage device exceeding the wake-up power threshold value, directing the dual-mode wireless power receiver client to wake-up from the low-power state. ### Claim 19 (depends on 18) The method of claim 18, wherein the directing step comprises: establishing communication with a wireless power transmission system; and receiving and storing directed or isolated wireless power transmitted by the wireless power transmission system via one or more paths. ### Claim 20 (depends on 19) The method of claim 19 further comprising: determining if a wake-up attempt is successful; and dynamically adjusting the wake-up threshold responsive to one or more successive unsuccessful wake-ups.