# US 12,191,803 B2 · Solar power generation system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,803 B2 - Document ID: US12191803B2 - Status: Granted - Kind: B2 - Application number: 18/106,485 - Filed: 2023-02-07 - Published: 2023-08-24 - Granted: 2025-01-07 - Earliest claimed: 2022-02-22 - Assignees: OMRON Corporation - Applicants: OMRON Corporation - Inventors: Takahiro Takeyama; Ryo Ogura; Jeongho Baik; Jun Nakaichi; Tsuyoshi Uchida; Tomoko Endo; Erica Martin - Web page: https://patentgrep.com/patent/US12191803B2 ## CPC - H02S 40/32: comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules - H02S 50/00: Monitoring or testing of PV systems, e.g. load balancing or fault identification - H02S 40/36: characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection - H02J 1/10: Parallel operation of DC sources - H02J 3/001: Arrangements for handling faults or abnormalities, e.g. emergencies or contingencies - H02J 2101/24: Photovoltaics - H02S: GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES (obtaining electrical energy from radioactive sources G21H1/12; light sensitive inorganic semiconductor devices H10F; light sensitive organic semiconductor devices H10K30/00; thermoelectric devices H10N10/00; pyroelectric devices H10N15/00) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A solar power generation system includes a string, an inverter, a first shutoff device, and a second shutoff device. The string includes a plurality of solar cell modules connected in series. The first shutoff device includes a first switching unit and a second switching unit, and turns OFF the switching units, in response to a first control signal from the inverter. The first switching unit is connected to an anode side terminal of the string and an anode side terminal of the inverter. The second switching unit is connected to a cathode side terminal of the string and a cathode side terminal of the inverter. The second shutoff device cuts off a solar cell module group including one or more among the plurality of solar cell modules and either another solar cell module or the inverter in response to a second control signal from the first shutoff device. ## Claims ### Claim 1 A solar power generation system comprising: a string including a plurality of solar cell modules connected in series; an inverter connected to the string and configured to convert DC power output from the string to AC power; a first shutoff device including a first switching unit and a second switching unit, the first switching unit connected to an anode side terminal of the string and an anode side terminal of the inverter, the second switching unit connected to a cathode side terminal of the string and a cathode side terminal of the inverter, the first shutoff device configured to turn OFF the first switching unit and the second switching unit in response to a first control signal from the inverter; and a second shutoff device connected to an electric path connecting a solar cell module group and either another solar cell module or the inverter, the solar cell module group including one or more among the plurality of solar cell modules connected in series in the string, the second shutoff device configured to cut off the solar cell module group and either the another solar cell module or the inverter in response to a second control signal from the first shutoff device; wherein the second shutoff device includes a third switching unit connected to an electric path connecting an anode side terminal of the solar cell module group and either the another solar cell module or the inverter, and a fourth switching unit connected to an electric path connecting a cathode side terminal of the solar cell module group and either the another solar cell module or the inverter; wherein the first switching unit and the second switching unit are configured to be turned ON/OFF independently of each other in response to the first control signal from the inverter, and wherein the third switching unit and the fourth switching unit are configured to be turned ON/OFF independently of each other in response to the second control signal from the first shutoff device. ### Claim 2 (depends on 1) The solar power generation system according to claim 1, wherein the second shutoff device includes a bypass device connected in parallel with the solar cell module group and configured to form an electric path bypassing the solar cell module group. ### Claim 3 (depends on 2) The solar power generation system according to claim 2, wherein the bypass device is a diode having an anode connected to the cathode side terminal of the solar cell module group and a cathode connected to the anode side terminal of the solar cell module group. ### Claim 4 (depends on 1) The solar power generation system according to claim 1, wherein the first shutoff device is driven by power supplied from a commercial power supply. ### Claim 5 (depends on 1) The solar power generation system according to claim 1, wherein the second shutoff device is driven by power generated by the solar cell modules. ### Claim 6 (depends on 1) The solar power generation system according claim 1, wherein the inverter outputs the first control signal to the first shutoff device by power line communication. ### Claim 7 (depends on 1) The solar power generation system according to claim 1, wherein the inverter outputs the first control signal to the first shutoff device by wireless communication. ### Claim 8 (depends on 1) The solar power generation system according to claim 1, wherein the first shutoff device outputs the second control signal to the second shutoff device by power line communication, upon receipt of the first control signal from the inverter. ### Claim 9 (depends on 1) The solar power generation system according to claim 1, wherein the first shutoff device outputs the second control signal to the second shutoff device by wireless communication, upon receipt of the first control signal from the inverter.