Power supply control device and system for turn-off device of photovoltaic module
By designing a string relay controller in the photovoltaic module, power is taken from the first photovoltaic panel of the photovoltaic group string, and power supply of the shutdown device is controlled through wireless communication, the problem of the photovoltaic panel shutdown device in the prior art requires an additional independent power supply, and the reliable shutdown control and cost reduction of the photovoltaic panel are achieved.
Patent Information
- Application Number
- CN202421091748.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-05-20
AI Technical Summary
In the prior art, the shutdown device of the photovoltaic panel requires an additional independent power supply, which leads to high construction difficulty and high hardware cost.
A power supply control device for a shutdown device of a photovoltaic module is designed, and power is withdrawn from the first photovoltaic panel of the photovoltaic string through a string relay controller, and external wireless signals are received through wireless communication to control the power supply of the shutdown device.
It solves the problems of high construction difficulty and high hardware cost caused by the need for an additional independent power supply of the shutdown device, and realizes reliable shutdown control of photovoltaic panels, while reducing hardware cost and construction difficulty.
Smart Images
Figure CN223024377U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the shutdown control of a photovoltaic panel, and particularly to a power supply control device and system for a shutdown device of a photovoltaic module. Background Art
[0002] For the power supply of the shutdown device of a photovoltaic panel in the prior art, generally, an additional power supply device is added at the installation site of the photovoltaic panel assembly to supply power to it separately to ensure the reliable shutdown of the photovoltaic panel. However, adding an additional power supply device at the installation site of the photovoltaic panel assembly has problems such as high on-site construction difficulty and high construction cost. Summary of the Utility Model
[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present utility model is to provide a power supply control device for a shutdown device of a photovoltaic module, which can solve the problems of high construction difficulty and high cost caused by the need for an additional independent power supply for the shutdown device in the prior art.
[0004] Another purpose of the present utility model is to provide a power supply control system for a shutdown device of a photovoltaic module, which can solve the problems of high construction difficulty and high cost caused by the need for an additional independent power supply for the shutdown device in the prior art.
[0005] One of the purposes of the present utility model is achieved by adopting the following technical solution:
[0006] A power supply control device for a shutdown device of a photovoltaic module includes a string relay controller and a shutdown device; wherein, the input end of the string relay controller is electrically connected to the first photovoltaic panel of the photovoltaic string, and the output end is electrically connected to the shutdown device, for controlling the on / off of the power supply of the shutdown device.
[0007] The shutdown device is connected in parallel to the second photovoltaic panel of the photovoltaic string, for controlling the shutdown of the second photovoltaic panel; the photovoltaic string includes a plurality of serially connected photovoltaic panels, and the first photovoltaic panel among the plurality of serially connected photovoltaic panels is the first photovoltaic panel, and the other photovoltaic panels are the second photovoltaic panels; the number of the shutdown devices is the same as the number of the second photovoltaic panels.
[0008] The string relay controller is used to disconnect the power supply of the shutdown device through the output end of the string relay controller when no wireless signal is received.
[0009] Further, the string relay controller includes a relay control module, a DC-DC module, and an electronic load; wherein, a first input end of the relay control module is electrically connected to a third end of the DC-DC module, a first end of the DC-DC module is electrically connected to the first photovoltaic panel, a second end of the DC-DC module is electrically connected to a first end of the electronic load, and a second end of the electronic load is electrically connected to a second input end of the relay control module; an output end of the relay control module is electrically connected to the shutdown device; wherein, the first end of the DC-DC module is an input end of the string relay controller, and the output end of the relay control module is an output end of the string relay controller; the electronic load is configured to detect the load-carrying capacity of the first photovoltaic panel through the DC-DC module.
[0010] Further, when no wireless signal is received within a preset time, the relay control module disconnects the power supply of the shutdown device through the output end of the relay control module;
[0011] When a wireless signal is received within a preset time, the relay control module detects whether the load-carrying capacity of the first photovoltaic panel meets the requirements by starting the electronic load, and then controls the on / off of the power supply of the shutdown device according to the load-carrying capacity of the first photovoltaic panel.
[0012] Further, the detection of whether the load-carrying capacity of the first photovoltaic panel meets the requirements by starting the electronic load specifically includes: detecting whether the voltage output at the second end of the DC-DC module meets the preset requirements by starting the electronic load.
[0013] Further, when there are multiple second photovoltaic panels, each second photovoltaic panel is connected in parallel with a shutdown device, and the multiple shutdown devices are connected in series with the string relay controller.
[0014] Further, it further includes a cluster controller; the cluster controller is wirelessly communicatively connected to the string relay controller and is configured to send a wireless signal to the string relay controller.
[0015] Further, the cluster controller includes an AC-DC module, a main controller, and a wireless transmitter; wherein, one end of the AC-DC module is electrically connected to an external power supply, and the other end is electrically connected to the main controller; the main controller also sends a wireless signal to the string relay controller through the wireless transmitter; the external power supply is an AC 220V power supply.
[0016] The second object of the present utility model is achieved by adopting the following technical solution:
[0017] A power supply control system for a shutdown device of a photovoltaic module, comprising a plurality of photovoltaic strings connected in parallel, and each photovoltaic string is connected to the power grid through an inverter; it further includes a power supply control device for a shutdown device of a photovoltaic module as adopted for one of the purposes of the present invention.
[0018] Each photovoltaic string includes a first photovoltaic panel and a plurality of second photovoltaic panels connected in series, and the first photovoltaic panel is electrically connected to the string relay controller of the power supply control device of a shutdown device of a photovoltaic module, and each second photovoltaic panel is electrically connected to the shutdown device of the power supply control device of the corresponding photovoltaic module. The string relay controller of each photovoltaic string is also electrically connected to the shutdown device of the corresponding photovoltaic string.
[0019] The string relay controller of each photovoltaic string is used to control the disconnection of the power supply of the shutdown device of the corresponding photovoltaic string through the output end of the string relay controller when no wireless signal is received, so as to shut down the second photovoltaic panels of the corresponding photovoltaic string.
[0020] Furthermore, it further includes a cluster controller; the cluster controller is wirelessly communicatively connected to the string relay controller of each photovoltaic string, and is used to send the wireless signal to each string relay controller.
[0021] Furthermore, the cluster controller includes an AC-DC conversion module, a main controller and a wireless transmitter; wherein, one end of the AC-DC conversion module is electrically connected to an external power supply, and the other end is electrically connected to the main controller; the main controller also sends a wireless signal to the string relay controller through the wireless transmitter; the external power supply is a power supply of 220V AC.
[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0023] By providing a string relay controller for the photovoltaic string in the present invention, it takes power from the first photovoltaic panel and provides a power supply for the shutdown device of the photovoltaic panel, solving the problems of high construction difficulty and high hardware cost caused by the need for an additional independent power supply device for the shutdown device in the prior art. At the same time, the string relay controller has a wireless communication function to receive external wireless signals, so as to realize the on-off control of the power supply of the shutdown device according to the wireless signal, and further realize the shutdown control of the photovoltaic panel. Brief Description of the Drawings
[0024] Figure 1 It is a schematic connection circuit diagram of a power supply control device for a shutdown device of a photovoltaic module provided by the present invention and a photovoltaic panel;
[0025] Figure 2 It is a schematic circuit diagram of the cluster controller provided by the present invention;
[0026] Figure 3 Schematic diagram of the connection circuit between multiple photovoltaic strings and corresponding power supply control devices in the power supply control system of a shutdown device for a photovoltaic module provided by the present utility model;
[0027] Figure 4 is Figure 3 Schematic diagram of the connection circuit between the cluster controller and the inverter in the power supply control system of a shutdown device for a photovoltaic module of Specific embodiments
[0028] Next, in combination with the accompanying drawings and specific embodiments, the present utility model will be further described. It should be noted that, on the premise of no conflict, any combination of the following-described embodiments or technical features can form a new embodiment.
[0029] Embodiment 1
[0030] As Figure 1 and Figure 2 shown, the present utility model provides a power supply control device for a shutdown device of a photovoltaic module, including a string relay controller and a shutdown device.
[0031] Among them, the input end of the string relay controller is electrically connected to the first photovoltaic panel of the photovoltaic string, and the output end is electrically connected to the shutdown device. The shutdown device is connected in parallel to the second photovoltaic panel of the photovoltaic string for controlling the shutdown of the second photovoltaic panel.
[0032] In the actual application process, a photovoltaic string includes multiple serially connected photovoltaic panels. The first photovoltaic panel among the multiple serially connected photovoltaic panels is used as the first photovoltaic panel in this embodiment, and the other photovoltaic panels are used as the second photovoltaic panels in this embodiment. Generally, the photovoltaic panel at the head of a photovoltaic string is used as the first photovoltaic panel, and the other photovoltaic panels are used as the second photovoltaic panels.
[0033] Each second photovoltaic panel is configured with a shutdown device, and the corresponding second photovoltaic panel can be shut down and controlled through the corresponding shutdown device.
[0034] In this embodiment, the string relay controller obtains the power supply from the first photovoltaic panel to provide the power supply for the shutdown device, which can solve the problems in the prior art that the shutdown device needs to be provided with an independent power module to ensure the stable operation of the shutdown device, resulting in high hardware costs and great on-site construction difficulties. The utility model does not need to set an additional independent power supply, but obtains power from one photovoltaic panel of the photovoltaic string to control the on-off of the power supply of the shutdown device, so as to realize the shutdown control of the photovoltaic panel. That is, when the string relay controller controls the power supply of the shutdown device to be disconnected, the shutdown device is powered off, and at this time, the second photovoltaic panel enters the shutdown state; on the contrary, when the string relay controller provides the power supply for the shutdown device, the shutdown device is powered on, and at this time, the second photovoltaic panel enters the state of releasing the shutdown, realizing the shutdown control of the photovoltaic panel of the photovoltaic string.
[0035] Preferably, in this embodiment, when the string relay controller controls the power-on of the power supply of the shutdown device, it is realized in a wireless manner. That is, the string relay controller receives a wireless signal to control the on-off of the power supply of the shutdown device connected thereto according to the wireless signal. Further, the utility model also stipulates that when the string relay controller does not receive a wireless signal within a preset time, it is considered that the photovoltaic string needs to be shut down, and the power supply of the shutdown device is disconnected. At this time, the shutdown device loses power, and the photovoltaic panel enters the shutdown state, such as when the photovoltaic panel has an abnormal fire or needs to be repaired. On the contrary, when the string relay controller receives a wireless signal within a preset time, it is considered that the photovoltaic string is working normally, and the power supply for the shutdown device is continued or the current state is maintained.
[0036] Further, the wireless signal can be sent by a cluster controller provided outside the photovoltaic string. The cluster controller can be arranged at a remote control end to send a wireless signal to the string relay controller through the cluster controller, so that the string relay controller realizes the on-off control of the power supply of the shutdown device according to whether the wireless signal is received. The wireless method for realizing the shutdown control of the photovoltaic string and the method of obtaining power from the photovoltaic panel solve the problems in the prior art that an independent power supply module is added on-site for the photovoltaic string for the use of the shutdown device, resulting in great construction difficulties and high hardware costs.
[0037] As Figure 2 shown, the cluster controller further includes a main controller, an AC-DC conversion module, and a wireless transmitter. One end of the main controller is electrically connected to an external power supply module through the AC-DC conversion module to obtain power for the operation of the cluster controller. The other end of the main controller is electrically connected to the wireless transmitter to send a wireless signal outward through the wireless transmitter to realize wireless communication with the string relay controller.
[0038] In addition, the external power supply module can be a power grid, which provides a power supply of 220V AC. The AC to DC module can convert the 220V AC power supply to provide power for the main controller.
[0039] That is, when the photovoltaic panel is working normally, the cluster controller continuously sends wireless signals outward, and the string relay controller receives the wireless signals on time; on the contrary, once a fire occurs, the power supply of the cluster controller can be disconnected, so that the cluster controller stops sending wireless signals outward. Then, once the string relay controller fails to receive the wireless signals, it disconnects the power supply of the shutdown device to achieve the shutdown operation.
[0040] More preferably, in order to cope with the signal delay, the string relay controller in this embodiment is also specified to disconnect the power supply of the shutdown device only when the wireless signal is not received within a preset time. Among them, the preset time is preferably 8s to 15s.
[0041] That is, the present utility model realizes the control detection function of a shutdown system of an array by setting a cluster controller to periodically send wireless signals to the outside. When the cluster controller is connected to the 220V AC power supply, the cluster controller will periodically send wireless signals to the string relay. When the 220V AC power supply loses power, the cluster controller cannot send wireless signals, and the string relay controller cannot receive the wireless signals within the specified time, and will cut off the power supply to the shutdown module to achieve the shutdown function.
[0042] Furthermore, since the power supply provided by the string relay controller in this embodiment to the shutdown device is powered from the first photovoltaic panel. In the actual application process, such as at night or when the sky is overcast, that is, when the light is insufficient, due to the insufficient power generation power of the first photovoltaic panel, the power supply provided by the string relay controller cannot drive the startup of all the subsequent shutdown devices. Even when the string relay controller normally receives the wireless signal, it cannot successfully start all the subsequent shutdown devices, which easily makes the subsequent shutdown devices enter an unstable state and affects the operation of the photovoltaic panel. To avoid the above situation, this embodiment also sets an electronic load inside the string relay controller to detect the load-carrying capacity of the first photovoltaic panel, so as to start the power supply of the subsequent shutdown device when the load-carrying capacity of the first photovoltaic panel is sufficient, and avoid the problem that the power supply provided to the subsequent shutdown device is unstable due to the insufficient load-carrying capacity of the first photovoltaic panel, resulting in an unstable working state of the shutdown device.
[0043] More specifically, as Figure 1As shown, the string relay controller includes a relay control module, an electronic load and a DC to DC module. Among them, the first input end of the relay control module is electrically connected to the third end of the DC to DC module. The first end of the DC to DC module is electrically connected to the first photovoltaic panel, and the second end of the DC to DC module is electrically connected to the first end of the electronic load. The second end of the electronic load is electrically connected to the second input end of the relay control module. The output end of the relay control module is electrically connected to the shutdown device. The relay control module is also connected to the cluster controller through wireless communication to receive wireless signals.
[0044] Among them, the first end of the DC to DC module is the input end of the string relay controller, and the output end of the relay control module is the output end of the string relay controller, which is used to take power from the photovoltaic panel and provide power supply to the relay control module after conversion, such as the 24V power supply in this embodiment.
[0045] Specifically, the relay control module in this embodiment detects the load capacity of the first photovoltaic panel by starting the electronic load to determine whether the power supply can start all the subsequent shutdown devices. Once it is detected that the load capacity of the photovoltaic panel is insufficient, the power supply of the switching device is cut off; on the contrary, when it is detected that the load capacity of the photovoltaic panel is sufficient, power supply is provided to the shutdown device.
[0046] That is, when the relay control module receives a wireless signal within a preset time, the load capacity of the first photovoltaic panel is detected by starting the electronic load to determine whether the load capacity of the first photovoltaic panel meets the requirements: if so, the power supply is provided to the subsequent shutdown device through the output end of the relay control module; if not, the power supply of the subsequent shutdown device is disconnected through the output end of the relay control module. By detecting the load capacity of the first photovoltaic panel, the problem that the power supply provided by the relay control module cannot start the subsequent shutdown device in insufficient light, resulting in unstable operation of the shutdown device, can be avoided, thereby affecting the normal power generation of the photovoltaic panel.
[0047] In addition, in actual use, when there is insufficient light, such as at night or when the weather is overcast, the inverter will also be connected to the grid, and even the electricity generated by the photovoltaic panel cannot be transmitted to the grid through the inverter. At this time, if the photovoltaic panel generates electricity, it will also cause a waste of electricity. Therefore, in this embodiment, it is stipulated that when the load capacity of the first photovoltaic panel is insufficient, the relay control module disconnects the power supply of the subsequent shutdown device, so that the shutdown device loses power, and all the second photovoltaic panels are in the shutdown state and do not generate electricity, such as at night or when the weather is overcast. On the contrary, when the load capacity of the first photovoltaic panel is sufficient, the relay control module provides power to the subsequent shutdown device so that the shutdown device is powered, and all the second photovoltaic panels enter the shutdown release state and start to generate electricity normally, such as in the morning or when the weather improves.
[0048] More specifically, in this embodiment, the load capacity of the first photovoltaic panel is detected by the electronic load by detecting the voltage magnitude of the power supply output at the second end of the DC-DC module. That is, when the voltage of the power supply output at the second end of the DC-DC module detected by the electronic load is less than the preset voltage value, for example, when the detected voltage in this embodiment is less than 23V, the load capacity of the first photovoltaic panel is insufficient (does not meet the requirements). At this time, the power supply of the shutdown device is cut off at the output end of the relay control module. On the contrary, when the voltage value of the power supply at the second end of the DC-DC module detected by the electronic load is greater than the preset value, for example, when the detected voltage in this embodiment is greater than 23V, the load capacity of the first photovoltaic panel meets the requirements, and at this time, the power supply is output to the shutdown device through the output end of the relay control module. That is, when the first photovoltaic panel generates electricity normally, the voltage of the power supply output at the second end of the DC-DC module should be a stable 24V. When the light is insufficient, the load capacity of the first photovoltaic panel is insufficient, and the voltage of the power supply output at the second end of the DC-DC module will gradually decrease and be lower than 24V; on the contrary, when the light is sufficient, the load capacity of the first photovoltaic panel is sufficient, and the electrical energy generated by the first photovoltaic panel is sufficient, and the voltage of the power supply output at the second end of the DC-DC module will increase and tend to be stable at 24V.
[0049] Therefore, in this embodiment, the load capacity of the first photovoltaic panel can be detected by setting a preset voltage value to detect the voltage of the power supply output at the second end of the DC-DC module. In addition, in this embodiment, the load capacity of the first photovoltaic panel can also be detected by detecting the change trend of the voltage of the power supply output at the second end of the DC-DC module. For example, when the voltage continuously decreases, it is considered that the load capacity of the first photovoltaic panel does not meet the requirements.
[0050] The utility model solves the problems of high construction difficulty and high hardware cost caused by the need for an additional independent power supply device for the shutdown device in the prior art by providing a string relay controller for the photovoltaic string, taking power from the first photovoltaic panel and providing a power supply to the shutdown device of the photovoltaic panel. At the same time, the string relay controller has a wireless communication function to receive external wireless signals, so as to realize the on-off control of the power supply of the shutdown device according to the wireless signals, and further realize the shutdown control of the photovoltaic panel. The utility model also sets an electronic load inside the string relay controller to detect the load capacity of the first photovoltaic panel, so as to ensure that the power supply provided by the string relay controller meets the requirements of the working power supply of the shutdown device, and avoid the instability of the power supply provided by the string relay controller due to the low load capacity of the first photovoltaic panel, and further avoid the unreliability of the shutdown device, affecting the shutdown control of the photovoltaic panel.
[0051] Embodiment 2
[0052] Based on Embodiment 1, the present utility model further provides a power supply control system for a shutdown device of a photovoltaic module, including a photovoltaic string, a string relay controller, and a shutdown device.
[0053] Among them, there are multiple photovoltaic strings, and each photovoltaic string includes a first photovoltaic panel and a second photovoltaic panel connected in series. The first photovoltaic panel of each photovoltaic string is electrically connected to a string relay controller, and the second photovoltaic panel is connected in parallel with a shutdown device. Moreover, the string relay controller of each photovoltaic string is also connected in series with the shutdown device of the corresponding photovoltaic string.
[0054] As Figure 3 shown, there are m photovoltaic strings. Among them, Photovoltaic String 1, Photovoltaic String 2,..., Photovoltaic String m each include a first photovoltaic panel and several second photovoltaic panels. The first photovoltaic panel is electrically connected to a string relay controller, and each second photovoltaic panel is connected in parallel with a shutdown device. The string relay controller of each photovoltaic string is connected in series with the corresponding shutdown device to control the on / off of the power supply of the corresponding shutdown device.
[0055] The m photovoltaic strings are connected in parallel and are connected to the power grid through an inverter, and the electric energy is transmitted to the power grid through the inverter to achieve photovoltaic power generation.
[0056] Furthermore, the system further includes a cluster controller. As Figure 4 shown, the cluster controller obtains power from the power grid for its own use. The cluster controller further includes an AC-DC conversion module, a main controller, and a wireless transmitter, which emits wireless signals outward so that the string relay controller of each photovoltaic string can receive them. The AC-DC conversion module converts alternating current into direct current for the use of the main controller. Once the corresponding string relay controller does not receive a wireless signal within a preset time, the power supply of the subsequent shutdown device in the photovoltaic string is disconnected through its output terminal, so that the photovoltaic panel enters the shutdown state, realizing the shutdown of the photovoltaic panel.
[0057] The present utility model realizes the shutdown control of the photovoltaic panel by setting a string relay controller with wireless communication function for each photovoltaic string and taking power from the photovoltaic panel to provide power supply for the shutdown device of the photovoltaic panel. At the same time, an electronic load is also arranged inside the string relay controller to detect the load-carrying capacity of the first photovoltaic panel, so as to ensure that the power supply provided by the string relay controller meets the requirements of the working power supply of the shutdown device, and to avoid the unstable power supply provided by the string relay controller due to the low load-carrying capacity of the first photovoltaic panel, which may lead to the unreliability of the shutdown device and affect the shutdown control of the photovoltaic panel.
[0058] The above embodiments are only the preferred embodiments of the present utility model, and the scope of protection of the present utility model cannot be limited thereby. Any non-substantive changes and substitutions made by those skilled in the art based on the present utility model fall within the scope of protection required by the present utility model.
Claims
1. A power supply control device for a photovoltaic module shutdown device, characterized in that: It includes a string relay controller and a shutoff device; wherein the input end of the string relay controller is electrically connected to the first photovoltaic panel of the photovoltaic string, and the output end is electrically connected to the shutoff device, and is used to control the on and off of the power supply of the shutoff device; The shutoff device is connected in parallel to the second photovoltaic panel of the photovoltaic string, and is used to control the shutoff of the second photovoltaic panel; the photovoltaic string includes a plurality of photovoltaic panels connected in series, and the first photovoltaic panel of the plurality of photovoltaic panels connected in series is the first photovoltaic panel, and the other photovoltaic panels are the second photovoltaic panels; the number of the shutoff devices is the same as the number of the second photovoltaic panels; The string relay controller is used to disconnect the power supply of the shutdown device through the output end of the string relay controller when no wireless signal is received.
2. The power supply control device of the photovoltaic module shutdown device according to claim 1, characterized in that: The string relay controller includes a relay control module, a DC-to-DC module and an electronic load; wherein, the first input end of the relay control module is electrically connected to the third end of the DC-to-DC module, the first end of the DC-to-DC module is electrically connected to the first photovoltaic panel, the second end of the DC-to-DC module is electrically connected to the first end of the electronic load, and the second end of the electronic load is electrically connected to the second input end of the relay control module; the output end of the relay control module is electrically connected to the shutdown device; wherein, the first end of the DC-to-DC module is the input end of the string relay controller, and the output end of the relay control module is the output end of the string relay controller; the electronic load is used to detect the load capacity of the first photovoltaic panel through the DC-to-DC module.
3. The power supply control device of the photovoltaic module shutdown device according to claim 2, characterized in that: When no wireless signal is received within a preset time, the relay control module disconnects the power supply of the shutoff device through the output end of the relay control module; When a wireless signal is received within a preset time, the relay control module starts the electronic load to detect whether the load capacity of the first photovoltaic panel meets the requirements, and then controls the on and off of the power supply of the shutdown device according to the load capacity of the first photovoltaic panel.
4. The power supply control device for the photovoltaic module shutdown device according to claim 3, characterized in that: The detecting whether the load capacity of the first photovoltaic panel meets the requirements by starting the electronic load specifically includes: detecting whether the voltage outputted from the second end of the DC-to-DC module meets the preset requirements by starting the electronic load.
5. The power supply control device of the photovoltaic module shutdown device according to claim 1, characterized in that: When there are multiple second photovoltaic panels, each second photovoltaic panel is connected in parallel with a shutoff device, and multiple shutoff devices are connected in series with the string relay controller.
6. The power supply control device for the photovoltaic module shutdown device according to claim 1, characterized in that: It also includes a cluster controller; the cluster controller is wirelessly connected to the string relay controller for sending wireless signals to the string relay controller.
7. The power supply control device for the photovoltaic module shutdown device according to claim 6, characterized in that: The cluster controller includes an AC-to-DC module, a main controller and a wireless transmitter; wherein one end of the AC-to-DC module is electrically connected to an external power supply, and the other end is electrically connected to the main controller; the main controller also sends a wireless signal to the string relay controller via a wireless transmitter; the external power supply is an AC 220V power supply.
8. A power supply control system for a photovoltaic module shutdown device, comprising a plurality of photovoltaic strings connected in parallel, and each photovoltaic string is connected to a power grid through an inverter; characterized in that: It also includes a power supply control device for a photovoltaic module shutdown device as described in any one of claims 1 to 5; Each photovoltaic string includes a first photovoltaic panel and a plurality of second photovoltaic panels connected in series, and the first photovoltaic panel is electrically connected to a string relay controller of a power supply control device of a shutdown device of a photovoltaic module, each second photovoltaic panel is electrically connected to a shutdown device of a power supply control device of a shutdown device of a corresponding photovoltaic module, and the string relay controller of each photovoltaic string is also electrically connected to the shutdown device of the corresponding photovoltaic string; The string relay controller of each photovoltaic string is used to control the disconnection of the power supply of the shutdown device of the corresponding photovoltaic string through the output end of the string relay controller when no wireless signal is received, so as to shut down the second photovoltaic panel of the corresponding photovoltaic string.
9. The power supply control system of the photovoltaic module shutdown device according to claim 8, characterized in that: It also includes a cluster controller; the cluster controller is wirelessly connected to the string relay controller of each photovoltaic string, and is used to send the wireless signal to each string relay controller.
10. The power supply control system of the photovoltaic module shutdown device according to claim 9, characterized in that: The cluster controller includes an AC-to-DC module, a main controller and a wireless transmitter; wherein one end of the AC-to-DC module is electrically connected to an external power supply, and the other end is electrically connected to the main controller; the main controller also sends a wireless signal to the string relay controller via a wireless transmitter; the external power supply is an AC 220V power supply.