# US 2021/0281114 A1 · Electronic circuit, module, and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0281114 A1 - Document ID: US20210281114A1 - Status: Published application - Kind: A1 - Application number: 17/186,794 - Filed: 2021-02-26 - Published: 2021-09-09 - Earliest claimed: 2020-03-03 - Assignees: Seiko Holdings Kabushiki Kaisha - Applicants: Seiko Holdings Kabushiki Kaisha - Inventors: Yoshifumi YOSHIDA; Noboru KAWAI - Web page: https://patentgrep.com/patent/US20210281114A1 ## CPC - H02J 50/001: {Energy harvesting or scavenging} - H02J 50/20: using microwaves or radio frequency waves - B60R 25/24: using electronic identifiers containing a code not memorised by the user - B60R 25/406: {Power supply in the remote key} - 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} - H02M 3/02: without intermediate conversion into AC - H05K 5/0217: {Mechanical details of casings (covers, lids, hoods or members for covering apertures H05K5/03)} - G07C 2009/00642: {by battery} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - 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) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE ## Abstract A convenient electronic circuit in which a switch can be switched through electric power obtained using weak radio waves is provided. An electronic circuit includes: a power supply configured to output direct current (DC) electric power; a switch which switches a connection state between the power supply and a load; a first power conversion circuit which converts electric power obtained using first radio waves received by a first antenna capable of receiving the first radio waves in a first direction into DC electric power and which outputs the converted DC electric power from a first DC power output terminal; a second power conversion circuit which converts electric power obtained using second radio waves received by a second antenna capable of receiving the second radio waves in a second direction different from the first direction into DC electric power and outputs the converted DC electric power from a second DC power output terminal; and a control circuit which controls a connection state of the switch such that it is in a conduction state when the first power conversion circuit outputs DC electric power due to the reception of the first radio waves by the first antenna and controls the connection state of the switch such that it is in a non-conduction state when the second power conversion circuit outputs DC electric power due to the reception of the second radio waves by the second antenna. ## Claims ### Claim 1 An electronic circuit, comprising: a switch which is connected between a power supply configured to output direct current (DC) electric power and a load driven by DC electric power supplied from the power supply and which switches a connection state between the power supply and the load to either a conduction state in which a supply of electric power from the power supply to the load is allowed or a non-conduction state in which the supply of electric power from the power supply to the load is cut off, a first power conversion circuit which includes a first power input terminal to which electric power obtained by first radio waves received by a first antenna capable of receiving the first radio waves in a first direction is input and a first DC power output terminal configured to output DC electric power and which converts electric power input to the first power input terminal into DC electric power and outputs the converted DC electric power from the first DC power output terminal; a second power conversion circuit which includes a second power input terminal to which electric power obtained by second radio waves received by a second antenna capable of receiving the second radio waves in a second direction different from the first direction is input and a second DC power output terminal configured to output DC electric power and which converts electric power input to the second power input terminal into DC electric power and outputs the converted DC electric power from the second DC power output terminal; and a control circuit which includes a first input terminal connected to the first DC power output terminal of the first power conversion circuit, a second input terminal connected to the second DC power output terminal of the second power conversion circuit, and an output terminal connected to the switch and configured to control the connection state of the switch and which controls the connection state of the switch such that it is the conduction state when the first power conversion circuit outputs DC electric power due to the reception of the first radio waves by the first antenna and controls the connection state of the switch such that it is the non-conduction state when the second power conversion circuit outputs DC electric power due to the reception of the second radio waves by the second antenna. ### Claim 2 (depends on 1) The electronic circuit according to claim 1, wherein the first antenna and the second antenna are provided at different positions from each other. ### Claim 3 (depends on 1) The electronic circuit according to claim 1, wherein the first antenna and the second antenna are provided at different angles from each other. ### Claim 4 (depends on 1) The electronic circuit according to claim 1, wherein the first antenna and the second antenna are provided perpendicular to each other. ### Claim 5 (depends on 1) The electronic circuit according to claim 1, wherein the first antenna is an electric field antenna, and the second antenna is a magnetic field antenna. ### Claim 6 (depends on 1) The electronic circuit according to claim 1, wherein the first antenna and the second antenna are antennas having different lengths from each other. ### Claim 7 (depends on 1) A module, comprising: the electronic circuit according to claim 1; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 8 (depends on 7) The module according to claim 7, wherein the module is accommodated in a waterproof housing. ### Claim 9 (depends on 7) A system, comprising: the module according to claim 7; and a transmitter configured to transmit prescribed radio waves to the module. ### Claim 10 (depends on 8) A system, comprising: the module according to claim 8; and a transmitter configured to transmit prescribed radio waves to the module. ### Claim 11 (depends on 2) A module, comprising: the electronic circuit according to claim 2; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 12 (depends on 11) The module according to claim 11, wherein the module is accommodated in a waterproof housing. ### Claim 13 (depends on 3) A module, comprising: the electronic circuit according to claim 3; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 14 (depends on 13) The module according to claim 13, wherein the module is accommodated in a waterproof housing. ### Claim 15 (depends on 4) A module, comprising: the electronic circuit according to claim 4; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 16 (depends on 15) The module according to claim 15, wherein the module is accommodated in a waterproof housing. ### Claim 17 (depends on 5) A module, comprising: the electronic circuit according to claim 5; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 18 (depends on 17) The module according to claim 17, wherein the module is accommodated in a waterproof housing. ### Claim 19 (depends on 6) A module, comprising: the electronic circuit according to claim 6; a power supply configured to output DC electric power; and a load driven by DC electric power supplied from the power supply. ### Claim 20 (depends on 19) The module according to claim 19, wherein the module is accommodated in a waterproof housing.