# US 12,184,078 B2 · Electromagnetic induction power generator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,078 B2 - Document ID: US12184078B2 - Status: Granted - Kind: B2 - Application number: 17/767,668 - Filed: 2020-12-04 - Published: 2022-08-04 - Granted: 2024-12-31 - Earliest claimed: 2019-12-24 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Yoshinobu Takayanagi; Akihiro Unno; Saiki Shigemori - Web page: https://patentgrep.com/patent/US12184078B2 ## CPC - H02J 50/001: {Energy harvesting or scavenging} - G01R 15/18: using inductive devices, e.g. transformers - G16Y 10/00: Economic sectors - H02J 11/00: Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted - H02J 50/10: using inductive coupling - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H02M 1/4225: {using a non-isolated boost converter} - H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G16Y: INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT] - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract An electromagnetic induction power generator includes a magnetic core attachable to a power transmission/distribution line, a power generating coil wound around the magnetic core, and a switching power supply circuit that converts AC appearing at both ends of the power generating coil into DC. The switching power supply circuit stops its switching operation based on a DC voltage level. The stop of the switching operation increases reactive power, allowing a stable power generating operation, i.e., a stable supply of active power irrespective of the amount of current flowing through the power transmission/distribution line. In addition, the amount of the reactive power can be finely adjusted based on the length of a period during which the switching operation is stopped, allowing a finer control of the reactive power. ## Claims ### Claim 1 An electromagnetic induction power generator comprising: a magnetic core attachable to a power transmission/distribution line; a generating coil wound around the magnetic core; and a switching power supply circuit that converts AC power appearing at both ends of the generating coil into DC power, wherein the switching power supply circuit includes a control circuit that stops a switching operation based on a voltage level of the DC power, and wherein the control circuit is further configured to control the switching power supply circuit such that: the switching power supply circuit intermittently performs the switching operation in response to a voltage level of the DC power exceeding a first predetermined value to increase a reactive power; the switching power supply circuit that includes a voltage converting circuit controls the voltage converting circuit to convert the voltage level of the DC power and supply a resultant DC power to an IoT device; and the switching power supply circuit adjusts the reactive power such that a total of power loss of the voltage converting circuit and load power consumed by the IoT device is equal to an active power. ### Claim 2 (depends on 1) The electromagnetic induction power generator as claimed in claim 1, wherein the control circuit is configured to control the switching power supply circuit that includes a rectifying circuit such that the rectifying circuit rectifies the AC power into a pulsating voltage and stops the switching operation in a period during which a voltage level of the pulsating voltage exceeds a second predetermined value in response to the voltage level of the DC power exceeding the first predetermined value. ### Claim 3 (depends on 1) The electromagnetic induction power generator as claimed in claim 1, wherein the magnetic core includes a first magnetic core attachable to a first power transmission/distribution line and a second magnetic core attachable to a second power transmission/distribution line, wherein the generating coil includes a first generating coil wound around the first magnetic core and a second generating coil wound around the second magnetic coil, and wherein the control circuit is configured to control the switching power supply circuit such that the switching power supply circuit synthesizes and converts AC power appearing at both ends of each of the first and second generating coils into DC power. ### Claim 4 (depends on 3) The electromagnetic induction power generator as claimed in claim 3, wherein phases of the AC power appearing at both ends of the first generating coil and the AC power appearing at both ends of the second generating coil differ from each other. ### Claim 5 (depends on 2) The electromagnetic induction power generator as claimed in claim 2, wherein the control circuit is further configured to control the switching power supply circuit that includes a voltage converting circuit such that the voltage converting circuit converts the voltage level of the DC power and supplies a resultant DC power to an IoT device, and wherein the switching power supply circuit adjusts the reactive power such that a total of power loss of the voltage converting circuit and load power consumed by the IoT device is equal to an active power.