A high-voltage direct-current arc extinguishing structure for perovskite photovoltaic components

Abstract

The application discloses a high-voltage direct-current arc extinguishing structure for a perovskite photovoltaic module, which comprises a mechanical switch unit and a solid-state switch unit connected in parallel with each other, a control unit, a multi-cavity arc extinguishing chamber, an energy absorption circuit and a shell. The control unit is connected with the mechanical switch unit and the solid-state switch unit. The composite commutation principle is adopted, the control unit preferentially triggers the solid-state switch unit to conduct when receiving an off signal, drives the mechanical switch unit to break in a zero-voltage state after shifting the main circuit current, and finally turns off the solid-state switch unit. The energy absorption circuit absorbs the overvoltage generated in the off instant. The multi-cavity arc extinguishing chamber is internally provided with a metal grid array matched with the high-voltage and low-current characteristics of the perovskite, which is used for introducing and dividing the residual arc to be extinguished. The components are collectively encapsulated in the shell, and the shell is internally filled with heat-conducting insulating glue. The application avoids the generation of arc by the mechanical contact, reduces the on-state loss of the system, and guarantees the long-term stable operation of the device in the outdoor harsh environment.

Description

Technical Field

[0001] This invention relates to the field of electrical protection technology for photovoltaic power generation, specifically a high-voltage DC arc extinguishing structure for perovskite photovoltaic modules. Background Technology

[0002] In photovoltaic power generation systems, electrical protection devices such as circuit breakers and switch-off devices are fundamental components ensuring the safe operation of the system. During the breaking process of a DC circuit, as the switch contacts separate, the circuit current cannot instantly return to zero, thus creating a high-temperature conductive plasma channel—a DC arc—by breaking down the air in the contact gap. The arc-extinguishing structure, as the core component for cutting off the DC arc, plays a crucial role in interrupting the current path and preventing the arc from continuing to burn.

[0003] Existing photovoltaic DC circuit breaking schemes generally employ traditional mechanical switches or pure solid-state semiconductor switches. When using conventional mechanical switches, the system's steady-state operating current is carried by closed metal contacts. Breaking relies on an operating mechanism to open the contacts, and the passively elongated arc is extinguished by surrounding arc-extinguishing grids or insulating gaps. When using pure solid-state switches, the semiconductor switching device is directly connected in series to the main circuit. The device carries the operating current throughout operation, and upon receiving a command, it cuts off the current flow by interrupting the drive signal of the semiconductor device, thus achieving circuit breaking without mechanical action.

[0004] As system operating voltage levels continue to increase, existing single circuit breaking technologies are insufficient to simultaneously meet the requirements of steady-state low-loss operation and high-voltage safe shutdown. When traditional mechanical switches break high-voltage DC circuits, the arc energy generated at the moment of contact separation increases dramatically. Existing passive arc extinguishing methods are insufficient for rapid and effective arc extinguishing, easily leading to severe erosion of the mechanical contacts and subsequent shutdown failure. On the other hand, if pure solid-state switching devices are used to achieve arc-free shutdown, these devices generate high on-state voltage drops and heat losses when carrying the steady-state operating current of the main circuit for extended periods. Furthermore, they are highly susceptible to breakdown damage from inductively induced overvoltages during shutdown, thus hindering the safety of high-voltage DC system operation. Summary of the Invention

[0005] The first aspect of the present invention provides a high-voltage DC arc extinguishing structure for perovskite photovoltaic modules, comprising a mechanical switching unit, a solid-state switching unit, a control unit, a multi-cavity arc extinguishing chamber, and an energy absorption circuit.

[0006] The solid-state switching unit and the mechanical switching unit are connected in parallel. One end of the parallel main circuit is used to connect to the positive terminal of the external perovskite photovoltaic module, and the other end is used to connect to the negative terminal of the external perovskite photovoltaic module or the inverter. The energy absorption circuit is connected in parallel with both the mechanical and solid-state switching units; the control unit is connected to both the mechanical and solid-state switching units.

[0007] The high-voltage DC arc-extinguishing structure employs a composite commutation principle to achieve arc-free interruption. The control unit receives the shutdown signal and triggers the solid-state switch unit to conduct, transferring the circuit current from the branch containing the mechanical switch unit to the branch containing the solid-state switch unit. After confirming the current transfer is complete, the control unit drives the mechanical switch unit to disconnect, achieving zero-voltage contact disconnection while the solid-state switch unit is conducting and shunting current. After the mechanical switch unit completely disconnects, the control unit controls the solid-state switch unit to turn off, and simultaneously, the energy absorption circuit clamps and absorbs the overvoltage in the main circuit at the instant the solid-state switch unit turns off.

[0008] The multi-cavity arc extinguishing chamber is equipped with a metal grid array. The multi-cavity arc extinguishing chamber is used to introduce residual electric arcs generated during circuit breaking and to divide and extinguish the residual electric arcs through the metal grid array.

[0009] In conjunction with the above-mentioned high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules, this invention further provides an optimized arc-extinguishing and protection scheme:

[0010] To extinguish residual electric arcs in circuits, the physical arc-extinguishing principle of multi-cavity arc-extinguishing chambers is based on the near-electrode voltage drop effect. Specifically, multiple layers of metal grids physically break the long residual arc into multiple short arc segments, each of which generates a fixed near-electrode voltage drop. The voltage drops of these multiple short arc segments, formed by the series connection of the multiple metal grids, are superimposed to constitute the total arc voltage. Since the total arc voltage exceeds the operating voltage of the perovskite photovoltaic module's high-voltage DC system, it disrupts the conditions for arc sustaining and forces the arc to extinguish.

[0011] To match the high operating voltage and low operating current characteristics of perovskite photovoltaic modules, the metal grid array is composed of 8 to 12 metal grids stacked at intervals, with the spacing between adjacent metal grids limited to 3 to 5 millimeters. The metal grids have V-shaped openings, with the open ends of the V-shaped openings facing the contact break position of the mechanical switching unit, to provide an electromagnetic attraction that guides residual electric arcs into the interior of the metal grid array.

[0012] The control unit has a preset fixed commutation delay time, or a current detection sensor is configured in the mechanical switch branch; the control unit confirms that the current transfer is complete based on the commutation delay time or the detection signal from the current detection sensor.

[0013] The stationary and moving contacts of the mechanical switch unit are provided with arc-initiating angles or arc-initiating channels extending into the multi-cavity arc-extinguishing chamber. Under the action of electromagnetic force or thermal buoyancy, the residual arc enters the multi-cavity arc-extinguishing chamber along the arc-initiating angles or arc-initiating channels.

[0014] The solid-state switching unit uses wide-bandgap semiconductor switching devices, while the contacts of the mechanical switching unit are made of a silver-based alloy material resistant to arc erosion. The energy absorption circuit includes zinc oxide varistors and RC snubber circuits connected in parallel. The zinc oxide varistors are used to limit voltage spikes in the main circuit, and the RC snubber circuits are used to suppress the voltage rise rate and voltage oscillations in the main circuit.

[0015] The high-voltage DC arc extinguishing structure is entirely encapsulated within a housing that meets IP67 protection standards, and the housing has lead-out terminals that penetrate and connect to both ends of the main circuit. The interior of the housing and the gaps between the components are filled with silicone thermally conductive insulating adhesive to simultaneously provide insulation, heat dissipation, dustproof, and moisture-proof protection.

[0016] This invention provides a high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules. It has the following beneficial effects: 1. This invention connects a solid-state switch unit and a mechanical switch unit in parallel. When a shutdown command is received, the control unit first triggers the solid-state switch unit to conduct in order to transfer the main circuit current. Then, after confirming the current transfer, the mechanical switch unit is driven to disconnect the contacts in a zero-voltage state. Finally, the solid-state switch unit is turned off. Combined with the energy absorption circuit to clamp overvoltage, this invention achieves a safe arc-free shutdown effect, avoiding the generation of electric arcs in the mechanical contacts during high-voltage DC interruption, reducing the conduction loss of the system in steady-state operation, and preventing device breakdown.

[0017] 2. This invention provides a reliable backup arc extinguishing effect by setting up a metal grid array inside the insulating high-voltage resistant shell of the multi-cavity arc extinguishing chamber. This array consists of 8 to 12 magnetically conductive metal grid sheets spaced 3 to 5 mm apart and with V-shaped openings facing the contact break position. This array is designed to precisely match the high-voltage, low-current arc characteristics of photovoltaic modules. The invention utilizes the near-polar voltage drop effect to create a total arc voltage greater than the system operating voltage, thereby disrupting the arc maintenance conditions and physically severing the residual long arc introduced into the arc extinguishing chamber into multiple short arc segments for forced extinguishing.

[0018] 3. This invention encapsulates the mechanical switch unit, solid-state switch unit, control unit, and multi-cavity arc-extinguishing chamber within an IP67-rated housing. The gaps between the core components are filled with thermally conductive silicone adhesive to create a deep, integrated seal. This achieves improved insulation performance and vibration resistance of the internal circuit structure while effectively enhancing system heat dissipation, thus ensuring long-term safe and stable operation of the high-voltage DC arc-extinguishing device in harsh photovoltaic operating environments such as high altitude, high humidity, and high dust levels. Attached Figure Description

[0019] Figure 1 This is a system framework diagram of the present invention.

[0020] Among them, 10 is a mechanical switch unit; 20 is a solid-state switch unit; 30 is a control unit; 40 is a multi-cavity arc-extinguishing chamber; 50 is an energy absorption circuit; and 60 is a housing. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: Please see the appendix Figure 1 This invention provides a high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules, comprising: a mechanical switching unit 10, a solid-state switching unit 20, a control unit 30, a multi-cavity arc-extinguishing chamber 40, and an energy absorption circuit 50.

[0023] The high-voltage DC arc-extinguishing structure is integrated into the DC input terminal of the photovoltaic string switch or inverter. The mechanical switch unit 10, solid-state switch unit 20, control unit 30, multi-cavity arc-extinguishing chamber 40, and energy absorption circuit 50 are all encapsulated within a single housing 60. Housing 60 has an IP67 protection rating. The interior of housing 60 is filled with thermally conductive insulating adhesive.

[0024] In the circuit topology, the solid-state switch unit 20 and the mechanical switch unit 10 are connected in parallel. One end of the parallel main circuit is connected to the positive terminal of the perovskite photovoltaic module, and the other end is connected to the negative terminal of the perovskite photovoltaic module or the inverter. The energy absorption circuit 50 is connected in parallel with the mechanical switch unit 10 and the solid-state switch unit 20. The control unit 30 is equipped with a microcontroller or logic control circuit, which is connected to the mechanical switch drive circuit and the solid-state switch drive circuit, respectively. The mechanical switch drive circuit is connected to the mechanical switch unit 10, and the solid-state switch drive circuit is connected to the solid-state switch unit 20.

[0025] Under normal conduction conditions, the mechanical switch unit 10 is in the closed state and carries the string operating current. At this time, the solid-state switch unit 20 is in the off state, and the energy absorption circuit 50 is in the standby state.

[0026] When a shutdown command is received, the control unit 30 receives the shutdown signal and first triggers the solid-state switch unit 20 to conduct. As the solid-state switch unit 20 conducts, the current in the circuit is transferred from the branch where the mechanical switch unit 10 is located to the branch where the solid-state switch unit 20 is located.

[0027] The control unit 30 has a preset fixed commutation delay time in the microsecond range, or the high-voltage DC arc extinguishing structure may also include a current detection sensor (such as a Hall current sensor, connected to the control unit 30) installed in the mechanical switch branch. After the solid-state switch unit 20 is turned on and the commutation delay time has elapsed, or after the current transfer is confirmed by the current detection sensor, the contact current of the mechanical switch unit 10 approaches zero. The control unit 30 drives the operating mechanism of the mechanical switch unit 10 to operate, causing the contacts of the mechanical switch unit 10 to open.

[0028] After the mechanical switch unit 10 is completely disconnected, the control unit 30 controls the solid-state switch unit 20 to turn off, cutting off the line current.

[0029] At the instant the solid-state switch unit 20 is turned off, the overvoltage generated by the line inductance is clamped and absorbed by the energy absorption circuit 50.

[0030] The stationary and moving contacts of the mechanical switch unit 10 are provided with arc-initiating angles or arc-initiating channels extending into the multi-cavity arc-extinguishing chamber 40. During circuit breaking, residual arcs generated are drawn into the multi-cavity arc-extinguishing chamber 40 along these arc-initiating angles or channels under the influence of electromagnetic force or thermal buoyancy. The residual arcs entering the multi-cavity arc-extinguishing chamber 40 are then divided and extinguished by metal grids inside the chamber.

[0031] The mechanical switch unit 10 includes a stationary contact, a moving contact, and an operating mechanism, specifically an electromagnetic operating mechanism or a spring-energy-storage operating mechanism. The mechanical switch unit 10 carries the steady-state operating current of the photovoltaic string under normal conducting conditions.

[0032] The stationary and moving contacts of the mechanical switching unit 10 are made of a silver-based alloy material resistant to arc erosion. The silver-based alloy material has low contact resistance, reducing the conduction loss of the mechanical switching unit 10 during long-term operation. The mechanical switching unit 10 carries steady-state current, avoiding the high losses and high heat generation associated with using purely solid-state switching devices.

[0033] Solid-state switching unit 20 is connected in parallel with mechanical switching unit 10, and the two ends of solid-state switching unit 20 are respectively connected to the input and output terminals of mechanical switching unit 10. Solid-state switching unit 20 is composed of wide bandgap semiconductor switching devices. In this embodiment, solid-state switching unit 20 specifically adopts one or more of SiC MOSFET devices, SiC JFET devices, or IGBT devices.

[0034] To adapt to the high-voltage DC system operating environment of perovskite photovoltaic modules (above 1500V), the solid-state switching unit 20 uses wide-bandgap semiconductor switching devices with high withstand voltage and low on-resistance characteristics.

[0035] The solid-state switching unit 20 has nanosecond-level turn-on and turn-off speeds. At the instant the mechanical switching unit 10 breaks, the solid-state switching unit 20 rapidly transfers the current in the main circuit to the branch where it is located. The rapid response of the solid-state switching unit 20, combined with the action of the mechanical switching unit 10, enables the mechanical switching unit 10 to break its contacts in a zero-voltage or zero-current state, preventing arcing at the contacts of the mechanical switching unit 10.

[0036] The multi-cavity arc-extinguishing chamber 40 is used to receive residual electric arcs generated when the circuit is interrupted. The multi-cavity arc-extinguishing chamber 40 includes an insulated high-voltage resistant outer shell and a metal grid array disposed inside the insulated high-voltage resistant outer shell.

[0037] The insulating high-voltage resistant housing is made of high-voltage resistant ceramic material or engineering plastic materials including polyphenylene sulfide and polyamide 66 with added glass fiber. The insulating high-voltage resistant housing has a withstand voltage greater than or equal to 2000V.

[0038] The metal grid array is composed of multiple layers of metal grids stacked at intervals. The metal grids are made of magnetically conductive materials, including electrical pure iron. The surface of the metal grids is coated with a copper or zinc layer. The copper or zinc plating layer is used to improve the conductivity and corrosion resistance of the metal grids.

[0039] To match the arc characteristics of perovskite photovoltaic modules, which operate at voltages greater than 1500V and currents of approximately 10A, the metal grid array comprises 8 to 12 metal grids. The spacing between adjacent metal grids is set to 3 to 5 millimeters. The metal grids have V-shaped openings, with the open ends of the V-shaped openings facing the contact break position of the mechanical switching unit 10, to provide an electromagnetic attraction that guides residual arcs into the metal grid array.

[0040] When the residual arc enters the multi-cavity arc-extinguishing chamber 40, multiple layers of metal grids divide the long residual arc into multiple short arc segments. The multi-cavity arc-extinguishing chamber 40 utilizes the near-electrode voltage drop effect to generate a voltage drop of approximately 20 to 30 volts for each short arc segment, making the total arc voltage of the divided short arc segments higher than the system operating voltage, thus forcing the arc to extinguish.

[0041] The energy absorption circuit 50 is connected in parallel with the mechanical switch unit 10 and the solid-state switch unit 20. The energy absorption circuit 50 is connected in parallel to the main circuit.

[0042] The energy absorption circuit 50 includes a zinc oxide varistor and an RC absorption circuit. The zinc oxide varistor and the RC absorption circuit inside the energy absorption circuit 50 are connected in parallel. The RC absorption circuit consists of a resistor and a capacitor connected in series.

[0043] In light of the high-voltage DC operating environment of perovskite photovoltaic modules, zinc oxide varistors are used to absorb overvoltages generated by inductive loads when the circuit is turned off and to limit voltage spikes in the main circuit.

[0044] An RC snubber circuit is used to suppress the rate of voltage rise and voltage oscillation in the main circuit.

[0045] The energy absorption circuit 50 absorbs the residual energy generated by the line inductance at the moment of turn-off and clamps the overvoltage, thereby protecting the solid-state switch unit 20 and the mechanical switch unit 10.

[0046] The mechanical switch unit 10, solid-state switch unit 20, control unit 30, multi-cavity arc-extinguishing chamber 40, and energy absorption circuit 50 are all encapsulated within a housing 60. The housing 60 meets the IP67 protection standard. The housing 60 has lead-out terminals that pass through the housing 60 and connect to both ends of the main circuit. These lead-out terminals are used to connect to the positive terminal of an external perovskite photovoltaic module and the negative terminal of the perovskite photovoltaic module or an inverter.

[0047] The interior of the housing 60 is filled with thermally conductive insulating adhesive. The thermally conductive insulating adhesive is an organosilicon potting compound and is filled inside the housing 60 and in the gaps between the mechanical switch unit 10, the solid-state switch unit 20, the control unit 30, the multi-cavity arc-extinguishing chamber 40 and the energy absorption circuit 50.

[0048] The outer shell 60, combined with thermally conductive insulating adhesive, achieves a seal for the high-voltage DC arc-extinguishing structure. This thermally conductive insulating adhesive not only improves the overall insulation performance of the high-voltage DC arc-extinguishing structure but also enhances the heat dissipation capacity and vibration and shock resistance of the internal components.

[0049] In conjunction with the high-voltage DC operating environment of perovskite photovoltaic modules exceeding 1500V, the outer shell 60 and thermally conductive insulating adhesive simultaneously provide insulation, heat dissipation, dustproof and moisture-proof protection for the high-voltage DC arc extinguishing structure, ensuring the stable operation of the high-voltage DC arc extinguishing structure in harsh operating environments with high altitude, high humidity and high dust.

[0050] For the specific circuit topologies of the microcontrollers, logic control circuits, mechanical switch drive circuits, and solid-state switch drive circuits involved in the high-voltage DC arc extinguishing structure, those skilled in the art can refer to existing conventional technologies for corresponding selection and construction. The above content belongs to the well-known technology in this field and will not be elaborated here.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules, characterized in that, include: Mechanical switching unit (10), solid-state switching unit (20), control unit (30), multi-cavity arc-extinguishing chamber (40), and energy absorption circuit (50); The solid-state switch unit (20) and the mechanical switch unit (10) are connected in parallel. One end of the main circuit after parallel connection is used to connect to the positive terminal of the external perovskite photovoltaic module, and the other end is used to connect to the negative terminal of the external perovskite photovoltaic module or the inverter. The energy absorption circuit (50) is connected in parallel with the mechanical switch unit (10) and the solid-state switch unit (20); The control unit (30) is connected to the mechanical switch unit (10) and the solid-state switch unit (20) respectively. The control unit (30) is used to receive the turn-off signal and trigger the solid-state switch unit (20) to turn on, so that the current in the circuit is transferred from the branch where the mechanical switch unit (10) is located to the branch where the solid-state switch unit (20) is located. After the current transfer is completed, the control unit (30) drives the mechanical switch unit (10) to turn off, and controls the solid-state switch unit (20) to turn off after the mechanical switch unit (10) is completely turned off. The energy absorption circuit (50) is used to clamp and absorb overvoltage at the moment the solid-state switch unit (20) is turned off; The multi-cavity arc extinguishing chamber (40) is provided with a metal grid array inside. The multi-cavity arc extinguishing chamber (40) is used to introduce the residual electric arc generated during the circuit breaking process, and to divide and extinguish the residual electric arc through the metal grid array.

2. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The control unit (30) has a fixed commutation delay time preset, or the high voltage DC arc extinguishing structure also includes a current detection sensor set in the mechanical switch branch; after the solid-state switch unit (20) is turned on and the commutation delay time has passed, or after the current transfer is detected and confirmed by the current detection sensor, the control unit (30) drives the operating mechanism of the mechanical switch unit (10) to act, so that the mechanical switch unit (10) achieves zero-voltage contact disconnection in the state of the solid-state switch unit (20) being turned on and shunted.

3. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The stationary and moving contacts of the mechanical switch unit (10) are provided with arc-inducing angles or arc-inducing channels extending to the multi-cavity arc-extinguishing chamber (40). The residual electric arc generated during the circuit breaking process is introduced into the multi-cavity arc-extinguishing chamber (40) along the arc-inducing angles or arc-inducing channels under the action of electromagnetic power or thermal buoyancy.

4. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The multi-cavity arc-extinguishing chamber (40) includes an insulating high-voltage resistant outer shell and the metal grid array disposed inside the insulating high-voltage resistant outer shell; The metal grid array is composed of multiple layers of metal grids stacked at intervals, and the metal grid array contains 8 to 12 metal grids, with the spacing between adjacent metal grids set to 3 to 5 millimeters.

5. A high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 4, characterized in that, The metal grid has a V-shaped opening, and the open end of the V-shaped opening faces the contact break position of the mechanical switch unit (10) to guide the residual electric arc into the metal grid array.

6. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 4, characterized in that, The metal grid is made of magnetically conductive materials, including electrical pure iron, and the surface of the metal grid is provided with a copper plating layer or a zinc plating layer to improve the conductivity and corrosion resistance of the metal grid; the insulating high-voltage resistant shell has a withstand voltage greater than or equal to 2000V.

7. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The solid-state switching unit (20) is composed of a wide bandgap semiconductor switching device, which includes one or more of SiCMOSFET devices, SiCJFET devices, or IGBT devices; The stationary and moving contacts of the mechanical switch unit (10) are made of silver-based alloy material that is resistant to electric arc erosion. The operating mechanism of the mechanical switch unit (10) includes an electromagnetic operating mechanism or a spring energy storage operating mechanism.

8. The high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The energy absorption circuit (50) includes a zinc oxide varistor and an RC absorption circuit connected in parallel. The RC absorption circuit is composed of a resistor and a capacitor connected in series. The zinc oxide varistor is used to limit voltage spikes in the main circuit, and the RC absorption circuit is used to suppress the voltage rise rate and voltage oscillation in the main circuit.

9. A high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 1, characterized in that, The mechanical switch unit (10), the solid-state switch unit (20), the control unit (30), the multi-cavity arc-extinguishing chamber (40), and the energy absorption circuit (50) are encapsulated together inside a housing (60) that meets the IP67 protection standard; The housing (60) is provided with lead-out terminals, which pass through the two ends of the housing (60) and connect to the main circuit, and are used to connect to the external perovskite photovoltaic module.

10. A high-voltage DC arc-extinguishing structure for perovskite photovoltaic modules according to claim 9, characterized in that, The interior of the outer casing (60) is filled with thermally conductive insulating adhesive. The thermally conductive insulating adhesive is an organosilicon potting compound and is filled inside the outer casing (60) and in the gaps between the above-mentioned units and circuits, providing insulation, heat dissipation, dustproof and moisture-proof protection simultaneously.

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