CN218771274U - Photovoltaic module turn-off device with low-voltage auxiliary power supply - Google Patents
Photovoltaic module turn-off device with low-voltage auxiliary power supply Download PDFInfo
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- CN218771274U CN218771274U CN202223106846.2U CN202223106846U CN218771274U CN 218771274 U CN218771274 U CN 218771274U CN 202223106846 U CN202223106846 U CN 202223106846U CN 218771274 U CN218771274 U CN 218771274U
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Abstract
The utility model provides a take photovoltaic module turn-off device of low pressure auxiliary power source, includes photovoltaic board, main power source, little the control unit, switch tube driver, switch tube and low pressure auxiliary power supply unit, the main power source does little the control unit's power supply, switch tube driver control end with little the control unit connects, and the output is with on the photovoltaic power supply loop of photovoltaic board the switch tube is connected, low pressure auxiliary power supply unit connects photovoltaic power supply loop is last, low pressure auxiliary power supply unit includes transformer drive circuit, isolation transformer, rectifier circuit and first order filter circuit. The utility model discloses be used in turn-off photovoltaic system fast after, can export reserve monitoring signal and stand-by power supply about 0.6 to 1V reliably and steadily, but the lowering system cost helps the popularization and the popularization of senior photovoltaic shutoff device or subassembly, promotes the realization that carbon reaches the peak target.
Description
Technical Field
The utility model belongs to the photovoltaic power generation field, concretely relates to take low pressure auxiliary power supply's photovoltaic module turn-off device.
Background
In recent years, green and environment-friendly solar photovoltaic power generation is more and more emphasized, and the scale and investment of the photovoltaic power generation are increased year by year. Generally, after a plurality of solar photovoltaic modules are connected in series and parallel, a direct-current high-voltage grid-connected power generation of hundreds of kilovolts can be formed. However, high voltage can endanger the safety of operators and fire fighters, and based on electrical and fire safety considerations, a solar photovoltaic power generation system must be provided with a photovoltaic panel assembly power output quick turn-off system which is connected between a photovoltaic panel and an inverter, so that the photovoltaic power supply system can be used for disconnecting a photovoltaic power supply loop to ensure the safety of personnel and property in case of emergency or specific situations.
In addition, according to relevant regulations, the photovoltaic module shutdown device is further required to provide a voltage of about 0.6 to 1v for each photovoltaic module after a shutdown instruction is started to serve as a standby monitoring signal (current and voltage signals) and a standby power supply of the photovoltaic system (a minimum value of a single photovoltaic module is 0.6V, and the voltage of a plurality of photovoltaic modules after being connected in series is generally not more than 30V). The standby monitoring signal and the standby power supply are respectively used for indicating the existence of solar irradiation and driving the standby power supply of the transmitter and the inverter, so that the whole photovoltaic system is in a standby state, and under the condition of no additional power supply, the whole photovoltaic system is prevented from being deadlocked, and the cost of an additional alternating current power supply can be saved.
The existing photovoltaic module shutdown device with module-level shutdown function includes a photovoltaic optimizer, a Rapid Shutdown Device (RSD), and the like, wherein:
photovoltaic optimizer: it can realize the function of above-mentioned reserve monitoring signal and auxiliary power supply through continuous vary voltage, but also has following defect:
1. the structure of the high-power high-voltage power supply comprises a large-capacity capacitor, a large-current inductor, a high-power supply chip and the like, and the hardware cost is high;
2. the traditional optimizer has larger size, more complex structure and higher production cost, and is not beneficial to popularization.
Common fast shutdown systems: the hardware components include an initiator, a transmitter, a receiver and a switch subsystem. The transmitter is a device responsible for sending a communication signal reflecting the current state of the initiator; the receiver is a device which is responsible for receiving the communication signal sent by the transmitter and can initiate the state change of the photovoltaic power module according to the received communication signal; the switching system can turn on/off the photovoltaic power supply loop based on a state change instruction sent by the receiver. Therefore, the common shutoff device only has a shutoff function.
This also causes the following drawbacks: in order to realize the function of the standby power supply, the common cutoff device needs to adopt an alternating current power supply system with extra hardware cost to supply power for the photovoltaic power generation system, so that the cost is increased, and monitoring signals cannot be provided for a photovoltaic loop after the photovoltaic system is turned off.
Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The utility model aims at providing a take low pressure auxiliary power source's photovoltaic module turn-off device.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a photovoltaic module turn-off device with a low-voltage auxiliary power supply comprises a photovoltaic panel, a main power supply, a micro control unit, a switch tube driver, a switch tube and a low-voltage auxiliary power supply device, wherein the main power supply is a power supply of the micro control unit and is a load of the photovoltaic panel to obtain a power supply, the control end of the switch tube driver is connected with the micro control unit, and the output end of the switch tube driver is connected with the switch tube on a photovoltaic power supply loop of the photovoltaic panel;
the low-voltage auxiliary power supply device is connected to the photovoltaic power supply loop and comprises a transformer driving circuit, an isolation transformer, a rectifying circuit and a first-stage filter circuit;
the isolation transformer is electrically connected with the micro control unit through the transformer driving circuit, the control end of the transformer driving circuit is electrically connected with the output end of the micro control unit, and the output end of the transformer driving circuit is connected with the input end of the isolation transformer;
the input end of the isolation transformer is connected with the main power supply or the photovoltaic panel to obtain power supply input, and the output end of the isolation transformer is connected to a photovoltaic power supply loop, namely a photovoltaic-inverter loop, through the rectifying circuit and the first-stage filter circuit.
The receiver of the quick breaker system is connected to a photovoltaic power supply loop (a power line carrier bus capable of being used for communication and power supply), the input end of the quick breaker system obtains a communication signal transmitted by the transmitter through the power line carrier bus, and the output end of the quick breaker system is connected with the micro control unit so as to transmit the communication signal to the micro control unit.
The micro control unit processes the signals and sends a starting instruction to the switching tube driver, and the switching tube driver closes the switching tube, so that the photovoltaic power supply loop of the photovoltaic panel is turned off.
Meanwhile, the micro control unit sends a starting instruction to the low-voltage auxiliary power supply device and enables the low-voltage auxiliary power supply device to be opened. After the low-voltage auxiliary power supply device is started, the main power supply or the high voltage of the photovoltaic panel is converted into low voltage (the minimum voltage of a single photovoltaic panel is 0.6V, and the voltage of a plurality of photovoltaic panels after being connected in series does not exceed 30V) and is transmitted to a photovoltaic-inverter loop, so that the functions of a standby monitoring signal and a standby power supply are realized.
When the low-voltage auxiliary power supply device is connected with the main power supply, the output voltage of the main power supply is the voltage after voltage reduction, and is about several volts to tens of volts, and at the moment, the low-voltage auxiliary power supply device only needs a low-power isolation transformer with low input voltage and a transformer driving circuit.
When the low-voltage auxiliary power supply device is directly connected with the photovoltaic panel, since the output voltage of the photovoltaic panel is generally about 40V at the present stage, with the increase of the demand and the improvement of the technology, the output voltage of the future new model is higher. Therefore, when the direct-connection type power supply is performed, the low-voltage auxiliary power supply device needs to use an isolation transformer and a transformer driving circuit with higher power and higher input voltage to realize the expected function, and the scheme can be applied to relatively increase a little cost.
1. According to a further technical scheme, the switch tube is connected to the positive electrode or the negative electrode of the photovoltaic power supply loop of the photovoltaic panel. The technical scheme is preferably applied to negative pole turn-off, namely the switch tube is connected to the negative pole of the photovoltaic power supply loop of the photovoltaic panel, so that the Low-voltage auxiliary power supply output of the common anode (Low-Side) is realized.
2. According to a further technical scheme, the transformer driving circuit comprises a DC-DC control driving circuit (a DC-DC chip), the DC-DC control driving circuit is electrically connected to a connecting line between the isolation transformer and the main power supply or between the isolation transformer and the photovoltaic panel, and when an enable switch of the DC-DC control driving circuit is turned on under the control of the micro control unit, the DC-DC control driving circuit and the isolation transformer start to work, so that the starting and the output of an auxiliary monitoring signal and an auxiliary power supply are realized.
3. According to the further technical scheme, the rectifying circuit comprises a rectifying diode, the rectifying diode is connected with the isolation transformer in series, and alternating current output by the isolation transformer can be rectified by the rectifying diode to obtain direct current. When other anti-backflow devices are not adopted, the rectifier diode can be used as the anti-backflow device, so that when a plurality of series-connected photovoltaic panel modules work, after one or a plurality of photovoltaic panel modules are turned off due to some reason, the high-voltage backflow on the photovoltaic power supply loop can be prevented from burning the low-voltage auxiliary power supply device or the whole rapid turn-off system.
4. According to the further technical scheme, the first-stage filter circuit comprises a first-stage filter capacitor, the first-stage filter capacitor is connected with the isolation transformer in parallel, and the rectified direct current has ripples, so that the first-stage filter capacitor is required to be used for filtering.
5. According to the technical scheme, the low-voltage auxiliary power supply device further comprises a voltage stabilizer, wherein the voltage stabilizer is connected with the isolation transformer in parallel, and the voltage stabilizer can be used for stabilizing the direct current after primary filtering. If the voltage characteristics output by the preceding stage meet the requirements of the system, the voltage stabilizer can be omitted, so that the cost is reduced.
6. In a further technical scheme, the low-voltage auxiliary power supply device further comprises a second-stage filter circuit, the second-stage filter circuit comprises a second-stage filter capacitor, the second-stage filter capacitor is connected with the isolation transformer in parallel, and the stabilized direct current may further have ripples, so that the second-stage filter capacitor is required to perform secondary filtering. If the voltage characteristics output by the preceding stage meet the requirements of the system, the second stage filter capacitor can be omitted, so that the cost is reduced.
7. According to the technical scheme, the low-voltage auxiliary power supply device further comprises a surge protection diode, the surge protection diode is connected with the isolation transformer in parallel, and the surge protection diode can protect a circuit and prevent surges.
8. According to the technical scheme, the low-voltage auxiliary power supply device further comprises a backflow prevention diode, wherein the backflow prevention diode is connected with the isolation transformer in series, and the backflow prevention function is achieved when the photovoltaic modules are connected in series for power supply.
The utility model discloses a theory of operation and advantage as follows:
1. the whole system improves and upgrades the existing common shutoff type (photovoltaic) assembly, a low-voltage auxiliary power supply device is additionally arranged, a main power supply or a photovoltaic panel of a micro control unit can be used as an input end power supply, high-voltage electricity is converted into low voltage by using an isolation transformer and a rectification filter circuit and is output to a photovoltaic-inverter loop, and after the rapid shutoff system is shut down, a standby monitoring signal and a standby power supply of about 0.6 to 1V can be stably and reliably output, so that the whole photovoltaic system is prevented from being deadlocked, and the system cost is reduced;
2. by adopting the power supply framework of the isolation transformer, the technical problem that the common anode is disconnected and is not common to the ground and cannot be controlled is solved;
3. the whole turn-off device has the isolation characteristic and high reliability, and the common anode and common cathode photovoltaic turn-off schemes can be applied.
Drawings
Fig. 1 is a circuit diagram of a fast turn-off system according to embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a fast turn-off system according to embodiment 2 of the present invention;
fig. 3 is a circuit diagram of a fast turn-off system according to embodiment 3 of the present invention;
fig. 4 is a circuit diagram of a fast turn-off system according to embodiment 4 of the present invention;
fig. 5 is a circuit diagram of the low-voltage auxiliary power supply device of the present invention.
In the drawings above: 1. a photovoltaic panel; 2. a main power supply; 3. a micro control unit; 4. a switching tube driver; 5. a switching tube; 6. a low voltage auxiliary power supply; 601. a transformer drive circuit; 602. an isolation transformer; 603. a rectifying circuit; 604. a first stage filter circuit; 605. a voltage regulator; 606. a second stage filter circuit; 607. a surge protection diode; 608. and a backflow prevention diode.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
example (b): the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.
The terms "first," "second," and the like, as used herein, do not denote any order or importance, nor do they denote any order or importance, but rather are used to distinguish one element from another element or operation described in such technical terms.
As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including, but not limited to.
As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this application, and in the special art. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.
Example 1
Referring to fig. 1, the present embodiment provides a photovoltaic module shutdown device with a low-voltage auxiliary power supply, which includes a photovoltaic panel 1, a main power supply 2, a micro control unit 3, a switching tube driver 4, a switching tube 5 and a low-voltage auxiliary power supply device 6. The whole turn-off device is matched with a receiver and a transmitting mechanism to form a quick turn-off system.
The receiver is communicated with the transmitter through a photovoltaic power supply loop which can be used for communication and power supply, the input end of the receiver is connected with the transmitter, the output end of the receiver is connected with the micro control unit 3 of the photovoltaic module turn-off device, and the receiver can receive a communication signal sent by the transmitter and then outputs the communication signal to the micro control unit 3.
The main power supply 2 is connected in parallel with the photovoltaic panel 1 and used for obtaining a power supply, the voltage output by the main power supply 2 is several volts to dozens of volts after voltage reduction, and the voltage can be determined according to a specific chip scheme and can supply power to the micro control unit 3, the micro control unit 3 can be an MCU, an RSIC, an ARM, a DSP, an ASCI, a CPLD, an FPGA and the like, the receiver can be independently set by a hardware circuit, and the micro control unit 3 with a receiving function can also be directly adopted, such as the MCS51, the RSIC, the ARM, the DSP, the ASCI, the CPLD, the FPGA and the like.
The control end of the switch tube driver 4 is connected with the micro control unit 3, and the output end of the switch tube driver is connected with the switch tube 5 on the negative electrode of the photovoltaic power supply loop of the photovoltaic panel 1.
The micro control unit 3 can receive and process the communication signal transmitted by the receiver, and controls the switching tube driver 4 based on the communication signal, so as to turn on and off the switching tube 5, that is, turn on and off the photovoltaic power supply loop, wherein the switching tube 5 is an MOS tube, and the corresponding switching tube driver 4 is an MOS driver.
The Low-voltage auxiliary power supply device 6 is connected to a photovoltaic power supply loop between the photovoltaic panel 1 and the inverter, and the whole scheme realizes the output of a Low-voltage auxiliary power supply of a common anode (Low-Side).
Referring to fig. 5, the low-voltage auxiliary power supply device 6 includes a transformer driving circuit 601, an isolation transformer 602, a rectifying circuit 603, a first-stage filter circuit 604, a voltage regulator 605, a second-stage filter circuit 606, a surge protection diode 607, and a backflow prevention diode 608. Wherein the content of the first and second substances,
the isolation transformer 602 is electrically connected to the micro control unit 3 through the transformer driving circuit 601, a control end of the transformer driving circuit 601 is electrically connected to an output end of the micro control unit 3, and an output end of the transformer driving circuit 601 is connected to an input end (primary coil end) of the isolation transformer 602;
the input end (primary coil end) of the isolation transformer 602 is connected to the main power supply 2, and the output end (secondary coil end) is connected to the photovoltaic power supply loop through the rectifying circuit 603 and the first-stage filter circuit 604.
The isolation transformer 602 is electrically connected with the receiver through a transformer driving circuit 601 with an enabling end, the transformer driving circuit 601 adopts a DC-DC chip or is composed of discrete components, and a DC-DC control driving circuit included in the isolation transformer 602 is connected with a primary coil of the isolation transformer in series and then connected to an output end of a main power supply 2 to form a primary input control loop. The secondary coil of the isolation transformer 602 and its auxiliary circuit are connected in parallel to the positive and negative terminals (VO +, VO-) of the total output terminal, i.e. connected to the photovoltaic power supply loop.
The rectifying circuit 603 includes a rectifying diode D1, the rectifying diode D1 is connected in series with the isolation transformer 602, and an anode of the rectifying diode D1 is connected to one end of the isolation transformer 602 corresponding to the current phase of the secondary winding, and rectifies the ac power into dc power.
The low-voltage auxiliary power supply device 6 further includes a voltage stabilizer 605, the voltage stabilizer 605 is connected in parallel with the isolation transformer 602, specifically, an input end and an output end of the voltage stabilizer 605 are connected in series with the positive electrode of the photovoltaic power supply loop, and a common ground end of the voltage stabilizer 605 is connected to the negative electrode of the photovoltaic power supply loop.
The low-voltage auxiliary power supply device 6 further includes a second-stage filter circuit 606, where the second-stage filter circuit 606 includes a second-stage filter capacitor C2, and the second-stage filter capacitor C2 is connected in parallel with the isolation transformer 602.
The low-voltage auxiliary power supply device 6 further includes a surge protection diode 607 (D2), and the surge protection diode 607 (D2) is connected in parallel with the isolation transformer 602.
The low-voltage auxiliary power supply device 6 further includes a backflow prevention diode 608 (D3), and the backflow prevention diode 608 (D3) is connected in series with the isolation transformer 602.
When the photovoltaic power supply loop is turned off, the micro control unit 3 sends a turn-on command and a control strategy to the low-voltage auxiliary power supply device 6 to turn it on. The transformer driving circuit 601 and the isolation transformer 602 start to work, convert the high voltage of the main power supply 2 into low voltage (the minimum voltage of a single photovoltaic panel is 0.6V, and the voltage of a plurality of photovoltaic panels after being connected in series is generally not more than 30V) and transmit the low voltage to the photovoltaic-inverter loop, so as to realize the functions of standby monitoring signals and standby power supply. If the control signal is saved, the driving circuit without the enable is adopted, the low-voltage auxiliary power supply device 6 can be normally opened, the circuit cannot be burnt due to the existence of the reverse filling prevention and protection circuit, and the method is very suitable for the situations without time sequence requirements and sensitive cost.
The control principle and the control method of the micro control unit 3 are prior art and mature techniques that can be grasped by those skilled in the art, and are not the point of the present invention, so that no further description is provided herein.
The alternating current after voltage reduction is rectified by the rectifier diode to obtain direct current, and when the subsequent backflow prevention diode 608 is not adopted, the rectifier diode can also play a backflow prevention role, so that the high voltage on the photovoltaic power supply loop is prevented from flowing backwards to burn out the low-voltage auxiliary power supply device 6 or the whole rapid turn-off system.
The rectified dc has ripples, and at this time, the dc can be filtered by using a first-stage filter capacitor C1, and the dc can be stabilized by using a voltage stabilizer 605 after filtering, and if the dc after stabilizing has ripples, secondary filtering needs a second-stage filter capacitor C2.
The filtered direct current can also be subjected to anti-surge protection through a surge protection diode 607, and finally, a backflow prevention diode 608 is utilized to perform secondary backflow prevention, and the processed direct current can be output to a photovoltaic-inverter loop.
In the scheme, low-voltage auxiliary power supply can be realized only by one low-power isolation transformer 602 and the transformer driving circuit 601, so that the cost is low and the reliability is high.
Example 2
The difference from example 1 is that:
referring to fig. 2, the switching tube 5 is connected to the positive electrode of the photovoltaic power supply loop of the photovoltaic panel 1, so as to realize the low-voltage auxiliary power output of the common cathode (High-Side).
The rest is the same as example 1, and therefore, the description is omitted.
Example 3
The difference from example 1 is that:
referring to fig. 3, the input end of the isolation transformer 602 and the DC-DC control driving circuit 601 thereof is directly connected to the photovoltaic panel 1, and instead of reducing voltage by the conversion of the main DC-DC power supply 2, a high-voltage-withstanding auxiliary power supply with the same structure is adopted, and the input end thereof is directly connected to the photovoltaic panel 601, so as to directly convert the output voltage of the photovoltaic panel 601 into the required voltage (0.6 to 1v) and current. Since the output voltage of the photovoltaic panel at the present stage is generally about 40V, the output voltage of the future new model will be higher with the increase of the demand and the improvement of the technology. Therefore, when the direct-connection auxiliary power supply is adopted, the low-voltage auxiliary power supply device needs to use an isolation transformer with higher power and higher input voltage and a transformer driving circuit to realize the function, relatively, the cost is increased, and the function of low-voltage auxiliary power supply can also be realized.
The rest of the process is the same as that of embodiment 1, and is applicable to a common-anode (Low-Side) turn-off scheme, so the details are not repeated.
Example 4
The difference from example 3 is that:
referring to fig. 4, the switching tube 5 is connected to the positive electrode of the photovoltaic power supply loop of the photovoltaic panel 1, so as to realize the output of the low-voltage auxiliary power supply of the common cathode (High-Side).
The rest of the process is the same as that of embodiment 2, and is applicable to a common-anode (Low-Side) turn-off scheme, so the details are not described herein.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. The utility model provides a take photovoltaic module turning off device of low pressure auxiliary power supply which characterized in that: the photovoltaic power generation system comprises a photovoltaic panel (1), a main power supply (2), a micro control unit (3), a switch tube driver (4), a switch tube (5) and a low-voltage auxiliary power supply device (6), wherein the main power supply (2) is a power supply of the micro control unit (3) and is a load of the photovoltaic panel (1), the control end of the switch tube driver (4) is connected with the micro control unit (3), and the output end of the switch tube driver is connected with the switch tube (5) on a photovoltaic power supply loop of the photovoltaic panel (1);
the low-voltage auxiliary power supply device (6) is connected to the photovoltaic power supply loop, and the low-voltage auxiliary power supply device (6) comprises a transformer driving circuit (601), an isolation transformer (602), a rectifying circuit (603) and a first-stage filter circuit (604);
the isolation transformer (602) is electrically connected with the micro control unit (3) through the transformer driving circuit (601);
the input end of the isolation transformer (602) is connected with the main power supply (2) or the photovoltaic panel (1), and the output end of the isolation transformer is connected to the photovoltaic power supply loop through the rectifying circuit (603) and the first-stage filter circuit (604).
2. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the switch tube (5) is connected to the positive pole or the negative pole of a photovoltaic power supply loop of the photovoltaic panel (1).
3. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the transformer driving circuit (601) comprises a DC-DC control driving circuit which is electrically connected to a connection line between the isolation transformer (602) and the main power supply (2) or between the isolation transformer (602) and the photovoltaic panel (1).
4. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the rectifying circuit (603) comprises a rectifying diode in series with the isolation transformer (602).
5. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the first stage filter circuit (604) includes a first stage filter capacitor connected in parallel with the isolation transformer (602).
6. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the low-voltage auxiliary power supply device (6) further comprises a voltage stabilizer (605), wherein the voltage stabilizer (605) is connected with the isolation transformer (602) in parallel.
7. The photovoltaic module turn-off device with the low-voltage auxiliary power supply as claimed in claim 1, wherein: the low-voltage auxiliary power supply device (6) further comprises a second-stage filter circuit (606), wherein the second-stage filter circuit (606) comprises a second-stage filter capacitor, and the second-stage filter capacitor is connected with the isolation transformer (602) in parallel.
8. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the low-voltage auxiliary power supply device (6) further comprises a surge protection diode (607), and the surge protection diode (607) is connected with the isolation transformer (602) in parallel.
9. A photovoltaic module shutdown device with a low voltage auxiliary power supply as claimed in claim 1, characterized in that: the low-voltage auxiliary power supply device (6) further comprises a backflow prevention diode (608), and the backflow prevention diode (608) is connected with the isolation transformer (602) in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223106846.2U CN218771274U (en) | 2022-11-22 | 2022-11-22 | Photovoltaic module turn-off device with low-voltage auxiliary power supply |
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| CN202223106846.2U CN218771274U (en) | 2022-11-22 | 2022-11-22 | Photovoltaic module turn-off device with low-voltage auxiliary power supply |
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