CN111555710A - PLC (programmable logic controller) driving circuit of photovoltaic shutoff device and control method thereof - Google Patents
PLC (programmable logic controller) driving circuit of photovoltaic shutoff device and control method thereof Download PDFInfo
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- CN111555710A CN111555710A CN202010537980.4A CN202010537980A CN111555710A CN 111555710 A CN111555710 A CN 111555710A CN 202010537980 A CN202010537980 A CN 202010537980A CN 111555710 A CN111555710 A CN 111555710A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 21
- 101700010313 PLC2 Proteins 0.000 claims description 5
- 101710009097 PLC8 Proteins 0.000 claims description 5
- 101700039183 PLCD1 Proteins 0.000 claims description 5
- 101700074329 PLCG1 Proteins 0.000 claims description 5
- 102100011802 PLCG1 Human genes 0.000 claims description 5
- 101710029124 RPS3A Proteins 0.000 claims description 5
- 101700008860 plc1 Proteins 0.000 claims description 5
- 101710023955 rps101 Proteins 0.000 claims description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a PLC (programmable logic controller) driving circuit of a photovoltaic breaker and a control method thereof, wherein the PLC driving circuit comprises a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal and a second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the source of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1. The invention not only can meet the requirement of fast turn-off safety, but also has high reliability, fast response speed, low cost and high efficiency.
Description
Technical Field
The invention relates to a photovoltaic drive circuit and a control method thereof, in particular to a PLC drive circuit of a photovoltaic shutoff device and a control method thereof.
Background
Fast turn-off is a photovoltaic plant safety protection concept introduced from the united states. The quick turn-off concept is provided for protecting installation and maintenance personnel of fire fighters and photovoltaic power stations, because the direct current side of the photovoltaic power station has direct current high voltage, as long as the direct current side is irradiated by the sun, the direct current high voltage on the battery board side always exists, and once the photovoltaic power station is in fire, the fire fighters cannot carry out fire extinguishing and emergency rescue work before the whole power station is burnt out.
Therefore, both the us national electrical specifications NEC 2014 and NEC 2017 set forth clear requirements for rapid dc-side shutdown of photovoltaic power plants. Will begin formal execution on 1/1 of 2019. NEC 2017 specifies: "outside the cluster, the controller is installed within 0.3 meters from the array and within more than 1 meter from the access point, after using the fast shut-down, the system takes 30 seconds to drop to 30V; within the cluster, the voltage is reduced to 80V within 30 seconds, and safety rescue measures are conveniently taken. "
Disclosure of Invention
The invention aims to solve the technical problem of providing a PLC driving circuit of a photovoltaic shutoff device and a control method thereof, which can meet the requirement of fast shutoff safety and can ensure the safety and reliability of a system.
The invention provides a photovoltaic shutoff PLC driving circuit to solve the above technical problems, which includes a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal, and a second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1; the input capacitor C1 is connected with the photovoltaic module in parallel, the positive electrode of the photovoltaic module is connected with the first output terminal, the negative electrode of the photovoltaic module is connected with the drain electrode of the switch tube Q1, the source electrode of the switch tube Q1 is connected with one end of the signal acquisition inductor L1, and the other end of the signal acquisition inductor L1 is connected with the second output terminal; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the source of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1.
Furthermore, the input end of the PLC signal amplification processing circuit module is a voltage signal PLC1 and a PLC2 of the PLC signal acquisition circuit, and the output end of the PLC signal amplification processing circuit module is connected with a signal amplification resistor R3; the signal amplification resistor R3 is connected in series with a capacitor C4, an inductor L2, an inductor L3 and a capacitor C6, the other end of the capacitor C6 is grounded, two ends of the inductor L3 are connected in parallel with an amplification processing capacitor C5, and a voltage signal of a connection point between the inductor L2 and the inductor L3 is an output signal PLC _ AD.
Furthermore, the capacitor C4, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the center frequency of the band-pass filter is 100KHZ to 160 KZ.
Further, the signal driving switch circuit comprises a voltage comparator, a switch tube Q2, a switch tube Q3 and a switch tube Q4, one input signal of the voltage comparator is the signal output signal PLC _ AD, the other input signal is a reference voltage Vref, an output end of the voltage comparator is connected with one end of a capacitor C7, the capacitor C7 is connected with a diode D2, a resistor R5 and a resistor R6 in series, a base of the switch tube Q2 is connected with the other end of the resistor R6, and an emitter of the switch tube Q2 is connected with ground; the intersection point of the capacitor C7 and the diode D2 is grounded through a resistor R4, and the intersection point of the resistor R5 and the resistor R6 is grounded through a capacitor C8; the collector of the switch tube Q2 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the base of the switch tube Q4; a collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected between a base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
Further, when the freewheeling diode D1 has no forward current, the impedance between the first output terminal and the second output terminal is in the range of 0.75-1.5 ohms.
The invention further provides a control method of the photovoltaic breaker PLC drive circuit to solve the technical problem, wherein the control method comprises the following steps: s1) voltage signals PLC1 and PLC2 of the PLC signal acquisition circuit generate output signals PLC _ AD after passing through a PLC signal amplification processing circuit module, and the output signals PLC _ AD generate output signals CPU _ CAP after passing through a voltage comparator of a signal driving switch circuit; s2) closing a control signal EN of the signal driving switch circuit, detecting an output signal PLC _ AD and an output signal CPU _ CAP, and opening the control signal EN if the output signal PLC _ AD is detected and the output signal CPU _ CAP is not detected; s3), and when detecting the output signal CPU _ CAP, turning off the control signal EN of the signal driving switch circuit.
Compared with the prior art, the invention has the following beneficial effects: the photovoltaic shutoff PLC drive circuit and the control method thereof provided by the invention can meet the safety requirement of quick shutoff, and are high in reliability, high in response speed, low in cost and high in efficiency.
Drawings
Fig. 1 is a power output circuit of a PLC driving circuit of a photovoltaic shutdown device according to an embodiment of the present invention;
fig. 2 is a PLC signal amplification processing circuit of the PLC driving circuit of the photovoltaic shutdown device in the embodiment of the present invention;
fig. 3 is a PLC signal driving switching circuit of the PLC driving circuit of the photovoltaic shutdown device according to an embodiment of the present invention;
fig. 4 is a power supply and control module of a PLC driving circuit of a photovoltaic shutdown device according to an embodiment of the present invention;
fig. 5 is a control flowchart of the PLC driving circuit of the photovoltaic shutdown device according to the embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, a driving circuit of a photovoltaic shutdown PLC according to an embodiment of the present invention includes a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal, and a second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the input capacitor C1 is connected with the photovoltaic module in parallel, the positive pole of the photovoltaic module is connected with the first output terminal 1-1, the negative pole of the photovoltaic module is connected with the drain electrode of the switch tube Q1, the source electrode of the switch tube Q1 is connected with one end of the signal acquisition inductor L1, the other end of the signal acquisition inductor L1 is connected with the second output terminal 1-2, and the second output resistor R2 and the signal acquisition capacitor C3 are connected in series and then connected with the signal acquisition inductor L1 in parallel; the cathode of the freewheeling diode D1 is connected with the first output terminal 1-1, the anode of the freewheeling diode D1 is connected with the source of the switching tube Q1, and the output capacitor C2 is connected with the first output resistor R1 in series and then connected with the freewheeling diode D1 in parallel.
The method of the embodiment of the invention, in which the signal acquisition resistor R2 and the capacitor C3 are connected in series and then connected in parallel with the signal acquisition inductor L1, can control the impedance in a required range of 0.75-1.5 ohm after being connected in parallel on the basis of small inductor L1, and has the advantages of small inductor L1, small loss, low heat generation and good system reliability. The output capacitor C2 is connected with the first output resistor R1 in series and then connected with the freewheeling diode D1 in parallel, so that under the condition that the diode has no forward current, the impedance between the first output terminal 1-1 and the second output terminal 1-2 can be in a required range of 0.75-1.5 ohm, and the series connection of the capacitor and the resistor has the advantages that the reliability of a system can be improved, and serious heating caused by capacitor failure can be avoided; the impedance range between the first output terminal 1-1 and the second output terminal 1-2 can be adjusted through the resistor; an optional set of values is: inductance L1 takes the value of 0.75uH, resistance R2 is 0.4 ohm, electric capacity C3 is 1uf, resistance R1 is 0.6 ohm, electric capacity C2 is 1 uf.
Referring to fig. 2, the PLC signal amplification processing circuit module according to the embodiment of the present invention has inputs of the voltage signals PLC1 and PLC2 of the PLC signal acquisition circuit, and an output of the PLC signal amplification processing circuit module is connected to the signal amplification resistor R3; the signal amplification resistor R3, the capacitor C4, the inductor L2, the inductor L3 and the capacitor C6 are connected in series, the other end of the capacitor C6 is grounded, the signal amplification capacitor C5 is connected with the inductor L3 in parallel, and the output signal PLC _ AD is a voltage signal of a connection point between the inductor L2 and the inductor L3. That is, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the maximum value of the output signal PLC _ AD is smaller than the reference voltage Vref after the signal with the center frequency of 130Khz, larger than 160KZ and smaller than 100Khz passes through the circuit.
Referring to fig. 3, the signal driving switch circuit according to the embodiment of the present invention includes a voltage comparator U1, a switch tube Q2, a switch tube Q3 and a switch tube Q4, wherein the input signals of the voltage comparator U1 are the signal PLC _ AD and the input reference voltage Vref, the output signal of the voltage comparator U1 is CPU _ CAP, the output of the voltage comparator U1 is connected to one end of a capacitor C7, the capacitor C7, a diode D2, a resistor R5 and a resistor R6 are connected in series, the other end of the resistor R6 is connected to the base of the switch tube Q2, and the emitter of the switch tube Q2 is connected to ground; one end of the resistor R4 is connected with the intersection point of the capacitor C7 and the diode D2, the other end of the resistor R4 is connected with the ground, the capacitor C8 is connected with the intersection point of the resistor R5 and the resistor R6, and the other end of the capacitor C8 is connected with the ground; one end of the resistor R8 is connected with the collector of the switch tube Q2, and the other end is connected with the base of the switch tube Q4; the collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected in parallel with the base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
In the embodiment of the invention, a circuit consisting of the capacitor C7, the capacitor C8, the diode D2, the resistor R4, the resistor R5 and the resistor R6 can drive the switching tube Q2 (without limiting a triode) only by outputting an alternating current signal, so that potential safety hazards caused by the fact that a voltage comparator U1 outputs a high level to turn on the triode due to a preceding stage fault are avoided; the high-low level of voltage comparator U1 output charges for electric capacity C8, R5, C8, R6 constitute and can make electric capacity C8 charge when having the PLC signal, when not having the PLC signal, electric capacity C8 discharges, can guarantee that 2 periods do not have the PLC signal, electric capacity C8's voltage can drive switch tube Q2, realize having the PLC signal to open switch tube Q1, do not have PLC signal definite time to close switch tube Q1.
With continued reference to fig. 4, the input of the power supply + control unit of the embodiment of the present invention is the photovoltaic module VPV, the signal PLC _ AD, and the signal CPU _ CAP; and outputting the power supply VCC and a control signal EN.
Referring to fig. 5, the control flow chart shows that the program first turns off the control signal EN, i.e., outputs a high level, then detects and analyzes the PLC signal, analyzes the PLC signal to be in accordance with the requirement, and simultaneously does not detect the signal CPU _ CAP which is not in accordance with the requirement, turns on the control signal EN, i.e., outputs a low level, and cyclically captures the signal CPU _ CAP after the program; when the signal CPU _ CAP with the frequency not meeting the requirement is detected, the control signal EN is closed, namely, a high level is output, and at the moment, the system can be in fault or an arc occurs, so that the system can be well protected.
According to the PLC driving circuit and the control method of the photovoltaic breaker, the switching tube Q1 can be enabled only, the switching tube Q1 is not directly started, the PLC hardware circuit realizes the opening and closing of the switching tube Q1, and the switching tube Q1 can be started only after the switching tube Q1 is enabled; has the following advantages:
(1) the software and hardware are perfectly combined, so that the safety is good, the reliability is high, and the response speed is high;
(2) low cost and high efficiency.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The PLC driving circuit of the photovoltaic breaker is characterized by comprising a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal and a second output terminal;
the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1;
the input capacitor C1 is connected with the photovoltaic module in parallel, the positive electrode of the photovoltaic module is connected with the first output terminal, the negative electrode of the photovoltaic module is connected with the drain electrode of the switch tube Q1, the source electrode of the switch tube Q1 is connected with one end of the signal acquisition inductor L1, and the other end of the signal acquisition inductor L1 is connected with the second output terminal; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the source of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1.
2. The PLC driving circuit of claim 1, wherein the input terminals of the PLC signal amplification processing circuit module are voltage signals PLC1 and PLC2 of a PLC signal acquisition circuit, and the output terminal of the PLC signal amplification processing circuit module is connected with a signal amplification resistor R3; the signal amplification resistor R3 is connected in series with a capacitor C4, an inductor L2, an inductor L3 and a capacitor C6, the other end of the capacitor C6 is grounded, two ends of the inductor L3 are connected in parallel with an amplification processing capacitor C5, and a voltage signal of a connection point between the inductor L2 and the inductor L3 is an output signal PLC _ AD.
3. The PLC driving circuit of claim 2, wherein the capacitor C4, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the center frequency of the band-pass filter is 100 KHZ-160 KZ.
4. The PLC driving circuit of claim 2, wherein the signal driving switch circuit comprises a voltage comparator, a switch tube Q2, a switch tube Q3 and a switch tube Q4, one input signal of the voltage comparator is the signal output PLC _ AD, the other input signal is a reference voltage Vref, an output end of the voltage comparator is connected with one end of a capacitor C7, the capacitor C7 is connected with a diode D2, a resistor R5 and a resistor R6 in series, a base of the switch tube Q2 is connected with the other end of a resistor R6, and an emitter of the switch tube Q2 is connected with ground; the intersection point of the capacitor C7 and the diode D2 is grounded through a resistor R4, and the intersection point of the resistor R5 and the resistor R6 is grounded through a capacitor C8; the collector of the switch tube Q2 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the base of the switch tube Q4; a collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected between a base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
5. The PLC driving circuit of claim 1, wherein the impedance between the first output terminal and the second output terminal ranges from 0.75 to 1.5 ohms when the freewheeling diode D1 has no forward current.
6. A control method of a photovoltaic shutdown PLC drive circuit according to claim 1, characterized by comprising the steps of:
s1) voltage signals PLC1 and PLC2 of the PLC signal acquisition circuit generate output signals PLC _ AD after passing through a PLC signal amplification processing circuit module, and the output signals PLC _ AD generate output signals CPU _ CAP after passing through a voltage comparator of a signal driving switch circuit;
s2) closing a control signal EN of the signal driving switch circuit, detecting an output signal PLC _ AD and an output signal CPU _ CAP, and opening the control signal EN if the output signal PLC _ AD is detected and the output signal CPU _ CAP is not detected;
s3), and when detecting the output signal CPU _ CAP, turning off the control signal EN of the signal driving switch circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010537980.4A CN111555710A (en) | 2020-06-12 | 2020-06-12 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010537980.4A CN111555710A (en) | 2020-06-12 | 2020-06-12 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device and control method thereof |
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| CN111555710A true CN111555710A (en) | 2020-08-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
| WO2022116389A1 (en) * | 2020-12-01 | 2022-06-09 | 浙江英达威芯电子有限公司 | Photovoltaic module turn-off circuit and photovoltaic device |
-
2020
- 2020-06-12 CN CN202010537980.4A patent/CN111555710A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022116389A1 (en) * | 2020-12-01 | 2022-06-09 | 浙江英达威芯电子有限公司 | Photovoltaic module turn-off circuit and photovoltaic device |
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
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