# US 11,114,841 B2 · DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,841 B2 - Document ID: US11114841B2 - Status: Granted - Kind: B2 - Application number: 16/882,805 - Filed: 2020-05-26 - Published: 2021-06-17 - Granted: 2021-09-07 - Earliest claimed: 2019-12-13 - Applicants: Zhejiang Jmthy Photovoltaic Technology Co., Ltd - Inventors: Weihui Wang; Xiangchun Deng - Web page: https://patentgrep.com/patent/US11114841B2 ## CPC - H02H 7/20: for electronic equipment (for converters H02H7/10; for electric measuring instruments G01R1/36; for DC voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08) - H02J 13/1311: {using the power network as support for the transmission} - H02J 3/381: {Dispersed generators} - H02J 13/13: characterised by the transmission of data to equipment in the power network - H02S 40/34: comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes - H02J 7/35: with light sensitive cells - H02J 2101/24: Photovoltaics - H02J 2105/16: being internal to power sources or power generation plants - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - Y02E 40/70: Smart grids as climate change mitigation technology in the energy generation sector - Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation - Y04S 10/123: the energy generation units being or involving renewable energy sources - Y04S 40/121: using the power network as support for the transmission - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - 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) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract A PV module, which includes PV+ and PV− output ports. An output capacitor Cout is connected to PV+ or PV− port through an electric switch. One end of a power inductor L1 is connected to OUT−, and the other end is grounded. The power inductor L1 is connected with a resonant capacitor C1 and an impedance resistor R2 in parallel. One end of a blocking capacitor C2 is used as the PLC+ port, one end of a blocking capacitor C3 is used as the PLC− port, and signal sources are connected to OUT+ and OUT− in parallel and send “Keep Alive” signals based on SunSpec communication protocol. PLC+ port and PLC− port are connected to a signal coupling input port of a control IC, and the control IC controls the electric switch. When the signal is decoded and extracted, the electric switch will remain on, otherwise it will be off. ## Claims ### Claim 1 A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol comprises a PV module, which comprises PV+ and PV− output ports, wherein the DC PLC PV rapid shutdown device circuit is based on SunSpec communication protocol is characterized in that: the DC PLC PV rapid shutdown device circuit comprises an output capacitor Cout, one end of the output capacitor Cout is connected to PV+ or PV− port through an electric switch, the other end of the output capacitor Cout is connected to PV− or PV+ port, two ends of the output capacitor Cout are respectively connected to OUT+ and OUT−, and PV− is grounded; the DC PLC PV rapid shutdown device circuit comprises a power inductor L1, one end of the power inductor L1 is connected to OUT−, and the other end thereof is grounded; the power inductor L1 is connected with a resonant capacitor C1 and an impedance resistor R2 in parallel; the DC PLC PV rapid shutdown device circuit comprises a blocking capacitor C2 and a blocking capacitor C3, one end of the blocking capacitor C2 is used as the PLC+ port, and the other end of the blocking capacitor C2 is connected to a ground terminal of the power inductor L1; one end of the blocking capacitor C3 is used as the PLC− port, and the other end of the blocking capacitor C3 is connected to the end where the power inductor Li is connected with OUT−; and signal sources are connected to OUT+ and OUT− in parallel and send “Keep Alive” signals based on SunSpec communication protocol; wherein the DC PLC PV rapid shutdown device circuit also comprises a control IC, PLC+ port and PLC− port are connected to a signal coupling input port of the control IC, a signal control terminal of the control IC is connected with the electric switch to control the electric switch, and PV+ is connected with the control IC and supplies power to the control IC. ### Claim 2 (depends on 1) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 1 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises an input capacitor Cin, which is connected to PV+ and PV− ports in parallel. ### Claim 3 (depends on 2) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 2 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises a free-wheeling diode D1, one end of the free-wheeling diode D1 is connected to a circuit where the output capacitor Cout is connected with OUT+, and the other end of the free-wheeling diode D1 is connected to a circuit where the power inductor L1 is grounded. ### Claim 4 (depends on 3) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 3 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises a dummy load R1, one end of the dummy load R1 is connected to a circuit where the output capacitor Cout is connected with OUT+, and the other end of the dummy load R1 is connected to a circuit where the power inductor L1 is grounded. ### Claim 5 (depends on 4) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 4 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises a drive circuit, the electric switch comprises MOSFETs S1 and S2, the MOSFETs S1 and S2 are connected in series to a circuit where PV+ is connected with the output capacitor Cout, a drive end Drv2 of the drive circuit is connected with a gate pole of the MOSFET S2, and a drive end Drv1 of the drive circuit is connected with a gate pole of the MOSFET S1; the signal terminal of the control IC is connected with the drive circuit; PV+ is connected to the control IC and the drive circuit and supplies power to the control IC and the drive circuit. ### Claim 6 (depends on 4) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 4 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises a drive circuit, the electric switch comprises MOSFETs S1 and S2, the MOSFETs S1 and S2 are connected in series to a circuit where PV− is connected with the output capacitor Cout, a drive end Drv2 of the drive circuit is connected with a gate pole of the MOSFET S2, and a drive end Drv1 of the drive circuit is connected with a gate pole of the MOSFET S1; the signal terminal of the control IC is connected with the drive circuit; PV+ is connected to the control IC and the drive circuit and supplies power to the control IC and the drive circuit. ### Claim 7 (depends on 5) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 5 is characterized in that the capacitance of the blocking capacitor C2 is equal to that of the blocking capacitor C3. ### Claim 8 (depends on 7) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 7 is characterized in that the signal source is an inverter or a signal generator, and the signal packet of the “Keep alive” signal is transmitted at a fixed interval; the signal packet includes AC signals with two different frequencies of 131.25 KHz and 143.75 KHz. ### Claim 9 (depends on 8) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 8 is characterized in that the conversion relation between the power inductor L1 and the resonant capacitor C1 is shown below: f = 1 2 ⁢ π ⁢ L ⁢ ⁢ 1 ⁢ ⁢ C ⁢ ⁢ 1 ; wherein, f is 143.75 KHz, and L1 is 0.5-10; the resistance of impedance resistor R2 is 152. ### Claim 10 (depends on 9) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 9 is characterized in that the DC PLC PV rapid shutdown device circuit also comprises an auxiliary power supply, which is connected to PV+, is connected with the control IC and the drive circuit and supplies power to the control IC and the drive circuit. ### Claim 11 (depends on 6) A DC PLC PV rapid shutdown device circuit based on SunSpec communication protocol according to claim 6 is characterized in that the capacitance of the blocking capacitor C2 is equal to that of the blocking capacitor C3.