An electronically isolated power switching circuit and power switching module thereof

Abstract

The utility model relates to electric power grid and electronic circuit technical field especially, a kind of electric power switch circuit and electric power switch module of electronic isolation of it, the electric power switch circuit has adopted switch tube to carry out on-off control, and has used the way of two switch tubes opposite connection, can realize the high-speed on-off switching of circuit, resistance and electromagnetic interference are small, can long-term stable and reliable operation, in low-frequency, high-frequency circuit scene and direct current, alternating current circuit scene can be applicable;In the gate side of two switch tubes Q1 and Q2, the power supply mode that DC / DC converter provides isolated direct current power supply and the mode that opto-coupler provides isolated on-off control are used, in weak current, strong current circuit scene can also be applicable, with the characteristics of stronger universality, wider application range;Meanwhile, the circuit modularization technology of its electric power switch module product is mature, low in cost, long in service life, stable and reliable in work, with good market prospect.

Description

Technical Field

[0001] This utility model relates to the field of power grid and electronic circuit technology, and in particular to an electronically isolated power switch circuit and its power switch module. Background Technology

[0002] Power switches, also known as circuit breakers, play two roles in power systems: first, control, which involves putting a portion of power equipment or lines into or out of operation according to the needs of the power system; and second, protection, which involves quickly disconnecting the faulty part of the power equipment or line from the power system when a fault occurs, ensuring the normal operation of the fault-free parts of the power system.

[0003] Currently, the main types of power switches on the market include relays, solenoid valves, AC contactors, and air circuit breakers. Each type has its own application scenarios and advantages and disadvantages. Relays are inexpensive, but they are mainly used in low-voltage control scenarios. Using them to control high-voltage circuits can easily lead to contact arcing damage and signal interference. Furthermore, due to their low switching speed, relays are unsuitable for high-frequency switching environments. Solenoid valves can be used in high-frequency environments, but are only suitable for DC circuits and cannot be used in AC circuits. AC contactors are mainly used in AC circuit scenarios and cannot be used for DC circuit control. They are also expensive, bulky, and have a narrow range of applications. Air circuit breakers are mainly divided into manual and automatic types. Manual air circuit breakers require manual control, while automatic air circuit breakers can be automatically controlled by electrical signals, but they are more expensive. Neither type can be used in DC circuits or high-frequency switching scenarios.

[0004] Therefore, how to design a power switch product with strong versatility and wide application range is a technical problem that the market needs to solve. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an electronically isolated power switch circuit and its power switch module product, which is applicable to a wider range of circuit application scenarios and has the technical advantage of better versatility.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In a first aspect, the present invention provides an electronically isolated power switching circuit, including a first optocoupler U1 and a second optocoupler U2, as well as a first switching transistor Q1 and a second switching transistor Q2. The anodes on the input side of the first optocoupler U1 and the second optocoupler U2 are both connected to the DC power supply terminal. The cathodes on the input side of the first optocoupler U1 and the second optocoupler U2 are respectively connected in parallel to one end of the enable switch SW1 through grounding resistor R3 and grounding resistor R4. The other end of the enable switch SW1 is connected to the DC power supply ground. The DC power supply is converted into a first isolated DC power supply and a second isolated DC power supply by a first isolated DC / DC converter U4 and a second isolated DC / DC converter U5, respectively. The anode of the first optocoupler U1 is connected to the first isolated DC power supply terminal, the cathode of the first optocoupler U1 is connected to the gate of the first switch Q1 through the protection resistor R2, the drain of the first switch Q1 is connected to the ground of the first isolated DC power supply, and the gate of the first switch Q1 is also connected to the ground of the first isolated DC power supply through the grounding resistor R1. The anode of the output side of the second optocoupler U2 is connected to the second isolated DC power supply terminal, the cathode of the output side of the second optocoupler U2 is connected to the gate of the second switch Q2 through the protection resistor R5, the drain of the second switch Q2 is connected to the ground of the second isolated DC power supply, and the gate of the second switch Q2 is also connected to the ground of the second isolated DC power supply through the grounding resistor R6. The source of the first switch Q1 is connected to the source of the second switch Q2, and the drain of the first switch Q1 and the drain of the second switch Q2 serve as two output connection terminals for the power switch circuit to access the working circuit.

[0007] Specifically, the first switch Q1 and the second switch Q2 are CMOS transistors or IGBT transistors.

[0008] As an optimization solution, an AC / DC converter is also included, wherein the input terminal of the AC / DC converter is connected to the live wire terminal and the neutral wire terminal for connecting to AC power; the AC power is converted into DC power by the AC / DC converter.

[0009] As an optimization scheme, it also includes a control signal input terminal GPIO for accessing external control signals; the control signal input terminal GPIO is connected at the parallel node of the grounding resistor R3 and the grounding resistor R4.

[0010] Secondly, this utility model also provides a power switch module, which includes an electronically isolated power switch circuit as described above; the power switch circuit is integrated on a circuit board and is insulated and encapsulated with insulating material; the DC power supply terminal and DC power ground of the power switch circuit are led out through wires for connecting to an external DC power supply; the two output connection terminals of the power switch circuit are led out through wires for connecting to the working circuit.

[0011] Specifically, the first switching transistor Q1 and the second switching transistor Q2 in the power switching circuit are CMOS transistors or IGBT transistors.

[0012] As an optimization, the power switch circuit further includes an AC / DC converter, the input terminal of which is connected to the live wire terminal and the neutral wire terminal for connecting to an AC power source; the AC power source is converted into the DC power source by the AC / DC converter; the live wire terminal and the neutral wire terminal are led out by wires for connecting to the live wire terminal and the neutral wire terminal of an external AC power source, respectively.

[0013] As an optimization, the power switch circuit also includes a control signal input terminal GPIO for receiving external control signals; the control signal input terminal GPIO is connected at the parallel node of the grounding resistor R3 and the grounding resistor R4; the control signal input terminal GPIO is led out through a wire for connecting to external control signals.

[0014] As a preferred option, epoxy resin is used as the insulating material for insulating encapsulation.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The electronically isolated power switch circuit of this utility model, by taking advantage of the high-speed switching control characteristics of the switching transistor, can realize high-speed switching of the circuit, and there are no problems of arcing damage and jitter signal interference. It has low resistance and electromagnetic interference, and can operate stably and reliably for a long time. It is applicable to both low-frequency and high-frequency circuit scenarios.

[0016] 2. The electronically isolated power switch circuit of this utility model uses two switching transistors connected in opposite directions to the two output connection terminals of the power switch circuit connected to the working circuit. When applied to DC circuit application scenarios, it can block the bidirectional current flow between the two output connection terminals. At the same time, such bidirectional current blocking design can also be applied to the on / off control of AC circuits. Therefore, it is applicable to both DC and AC circuit scenarios.

[0017] 3. The electronically isolated power switch circuit of this utility model employs a DC / DC converter to provide isolated DC power supply and an optocoupler to provide isolated on / off control on the gate side of the two switching transistors Q1 and Q2. It can be applied not only to the on / off control of weak current signals, but also to circuit scenarios where weak current controls strong current signals. Specifically, when applied to weak current low-voltage and low-current circuit scenarios, the two switching transistors Q1 and Q2 are selected to be CMOS transistor devices to form the circuit. When applied to strong current high-voltage and high-current circuit scenarios, the two switching transistors Q1 and Q2 are selected to be IGBT transistor devices to form the circuit. That is, this circuit design is applicable to both weak current and strong current circuit scenarios.

[0018] 4. In addition to using the enable switch SW1 to manually control the on / off state of the two output connection terminals connected to the working circuit, the electronically isolated power switch circuit of this utility model can also be equipped with a control signal input terminal GPIO for receiving external control signals. Using external control signals or remote control signals, the power switch circuit can be automatically controlled on / off.

[0019] 5. The power switch module designed based on the power switch circuit of this utility model inherits the characteristics of strong versatility and wide application range of the aforementioned power switch circuit. It can easily design power switch module products suitable for different circuit scenarios such as low frequency, high frequency, DC, AC, weak current, and strong current. At the same time, the circuit modularization technology is mature, the cost is low, the service life is long, the operation is stable and reliable, and it has a good market prospect. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a circuit example diagram of one embodiment of the electronically isolated power switch circuit of this utility model.

[0021] Figure 2 This is an example circuit connection diagram of the first isolated DC / DC converter and the second isolated DC / DC converter in the electronically isolated power switch circuit of this utility model.

[0022] Figure 3 This is a circuit connection example diagram of the AC / DC converter added to the electronically isolated power switch circuit of this utility model.

[0023] Figure 4 This is a circuit example diagram of another embodiment of the electronically isolated power switch circuit of this utility model.

[0024] Figure 5 This is an example diagram of the integrated circuit wiring for the power switch circuit of this utility model.

[0025] Figure 6 This is a sample illustration of the power switch module product of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but only to represent selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] This utility model provides an electronically isolated power switching circuit, such as... Figure 1 and Figure 2 As shown, the power switching circuit includes a first optocoupler U1 and a second optocoupler U2, as well as a first switching transistor Q1 and a second switching transistor Q2. The input-side anodes of both the first optocoupler U1 and the second optocoupler U2 are connected to a DC power supply terminal. The input-side cathodes of the first optocoupler U1 and the second optocoupler U2 are connected in parallel to one end of an enable switch SW1 through grounding resistors R3 and R4, respectively. The other end of the enable switch SW1 is connected to the DC power supply ground. The DC power supply (VCC5.0) is converted into a first isolated DC power supply (VCC51) and a second isolated DC power supply (VCC52) through a first isolated DC / DC converter U4 and a second isolated DC / DC converter U5, respectively. The output-side anode of the first optocoupler U1 is connected to the first isolated DC power supply terminal, and the output-side cathode of the first optocoupler U1 is connected to the gate (G) of the first switching transistor Q1 through a protection resistor R2. The drain (D) of Q1 is connected to the first isolated DC power supply ground (GND_1), and the gate (G) of the first switching transistor Q1 is also connected to the first isolated DC power supply ground (GND_1) through a grounding resistor R1; the anode of the output side of the second optocoupler U2 is connected to the second isolated DC power supply terminal, and the cathode of the output side of the second optocoupler U2 is connected to the gate (G) of the second switching transistor Q2 through a protection resistor R5; the drain (D) of the second switching transistor Q2 is connected to the second isolated DC power supply ground (GND_2), and the gate (G) of the second switching transistor Q2 is also connected to the second isolated DC power supply ground (GND_2) through a grounding resistor R6; the source (S) of the first switching transistor Q1 is connected to the source (S) of the second switching transistor Q2, and the drain (D) of the first switching transistor Q1 and the drain (D) of the second switching transistor Q2 serve as two output connection terminals (L_IN and L_OUT) for the power switching circuit to access the working circuit.

[0029] The working principle of the electronically isolated power switch circuit of this invention is as follows: When the enable switch SW1 is closed and turned on, the power supply to the input side of the first optocoupler U1 and the second optocoupler U2 forms a path and current flows through, so that the output side of the first optocoupler U1 and the second optocoupler U2 is in a conducting state. Therefore, the gates (G) of the first switch Q1 and the second switch Q2 are both at a high level, so that the source (S) and drain (D) of the first switch Q1 and the second switch Q2 are synchronously turned on. The two output connection terminals of the power switch circuit connected to the working circuit form a path, which plays the role of switching on.

[0030] When the enable switch SW1 is turned off, the power supply to the input side of the first optocoupler U1 and the second optocoupler U2 is disconnected and there is no current, so the output side of the first optocoupler U1 and the second optocoupler U2 is in an open circuit state. Therefore, the gates (G) of the first switch Q1 and the second switch Q2 are both at a low level, so that the source (S) and drain (D) of the first switch Q1 and the second switch Q2 are simultaneously disconnected. The two output connection terminals of the power switch circuit connected to the working circuit form an open circuit, which plays the role of switching open circuit.

[0031] This utility model employs the aforementioned power switch circuit design, offering several advantages: The power switch circuit utilizes switching transistors for on / off control, employing a two-transistor, opposing connection method. Specifically, the source (S) of the first transistor Q1 is connected to the source (S) of the second transistor Q2. The drain (D) of the first transistor Q1 and the drain (D) of the second transistor Q2 serve as the two output terminals of the power switch circuit's operating circuit. By synchronously controlling the gates of the two transistors Q1 and Q2, synchronous conduction or disconnection between their sources and drains is achieved. This leverages the high-speed on / off control characteristics of the switching transistors, enabling high-speed switching of the circuit without arcing damage or jitter interference. It exhibits low resistance and electromagnetic interference, ensuring long-term stable and reliable operation, and is applicable in both low-frequency and high-frequency circuit scenarios. Furthermore, the use of two opposing transistors at the two output terminals of the power switch circuit's operating circuit is suitable for applications involving DC power supplies. This circuit design can block bidirectional current flow between two output terminals. For example, in battery-powered circuits, it can prevent reverse discharge of the battery when the charger fails, and in motor drive circuits, it can suppress back electromotive force generated by inductive loads. This bidirectional current blocking design can also be applied to AC circuit switching control, making it suitable for both DC and AC circuits. Furthermore, on the gate sides of the two switches Q1 and Q2, a DC / DC converter provides isolated DC power, and an optocoupler provides isolated switching control. This allows for applications not only in low-voltage to low-current signal switching but also in low-voltage to high-voltage signal control circuits. Specifically, in low-voltage, low-current circuits, CMOS transistors are used for Q1 and Q2, while IGBTs are used for high-voltage, high-current circuits. In other words, this circuit design is applicable to both low-voltage and high-voltage circuits.

[0032] As can be seen, the electronically isolated power switch circuit design of this utility model is well applicable to low-frequency and high-frequency circuit scenarios, as well as DC and AC circuit scenarios, and weak and strong electrical circuit scenarios, and has the characteristics of strong versatility and wide application range.

[0033] As an optimized design, if the electronically isolated power switch circuit of this utility model is applied to AC circuit switching control scenarios, an AC / DC converter U3 can be added to simplify the power supply design; such as Figure 3 As shown, the input terminals of AC / DC converter U3 are connected to the live wire and neutral wire terminals for AC power supply. These terminals allow direct connection to the AC power supply of the AC circuit. The AC power supply is converted into DC power (VCC5.0) by AC / DC converter U3, which powers the input sides of the first optocoupler U1 and the second optocoupler U2. The DC power supply (VCC5.0) is then converted by the first isolated DC / DC converter U4 and the second isolated DC / DC converter U5 to obtain the first isolated DC power supply (VCC51) and the second isolated DC power supply (VCC52), which power the gates of the first switching transistor Q1 and the second switching transistor Q2. In this way, the power supply for the entire circuit can be provided by the AC power supply in the AC circuit, eliminating the need for an additional DC power supply specifically for the power switching circuit, thus simplifying circuit layout in AC power supply applications.

[0034] As an optimized design, in the electronically isolated power switch circuit of this utility model, in addition to using the enable switch SW1 to manually control the on / off state of the two output connection terminals connected to the working circuit, a control signal input terminal GPIO for receiving external control signals can also be added; such as Figure 4As shown, the control signal input terminal GPIO is connected at the parallel node of the grounding resistors R3 and R4. In this way, during use, the control signal input terminal GPIO can be connected to the control signal output terminal of an external device or the remote control signal output terminal. Through external or remote signals, the on / off switching control of the power switch circuit can be achieved. Because the control signal input terminal GPIO is connected at the parallel node of the grounding resistors R3 and R4 inside the power switch circuit, it is equivalent to the control signal input terminal GPIO forming a parallel loop with the first isolated DC power supply (VCC51) and the second isolated DC power supply (VCC52). During operation, when the control signal input terminal GPIO is high, it is equivalent to both ends of grounding resistor R3 and grounding resistor R4 being at a high potential. There is no current on the input sides of the two optocouplers U1 and U2. At this time, the output sides of the two optocouplers U1 and U2 are in an open-circuit state. Therefore, the gates (G poles) of the first switch Q1 and the second switch Q2 are both at a low level, making the first switch Q1... The source (S) and drain (D) of the second switch Q2 are simultaneously disconnected, thus disconnecting the two output terminals of the power switch circuit. When the control signal input terminal GPIO is low, it acts as a low-level ground, creating a potential difference across the grounding resistors R3 and R4. Current flows through the input sides of the two optocouplers U1 and U2, causing their output sides to be simultaneously connected. The gates (G) of both the first and second switches Q1 and Q2 are high, simultaneously conducting between their sources (S) and drains (D), thus connecting the two output terminals of the power switch circuit. Therefore, automatic on / off control of the power switch circuit can be achieved using external or remote control signals.

[0035] In specific technical implementation, the specific resistance values ​​of each resistor in the power switch circuit of this utility model can be selected according to the circuit design specifications and requirements, depending on the needs of different circuit application scenarios. Figures 1 to 4 The circuit example shown uses a common 220V, 10A power switch circuit as an example.

[0036] The electronically isolated power switch circuit of this invention can be designed as a power switch module when commercialized. Specifically, the electronically isolated power switch circuit described above is integrated on a circuit board and insulated with insulating material; the DC power supply terminal and DC power ground of the power switch circuit are led out through wires for connecting to an external DC power supply; the two output connection terminals of the power switch circuit are led out through wires for connecting to the working circuit. Figure 5An example of the integrated circuit wiring diagram of the power switch circuit design of this utility model as a circuit board is shown; Figure 6 A sample example of a power switch module product integrating the power switch circuit of this utility model is shown.

[0037] In the power switch module used in low-voltage, low-current circuit scenarios, the two switching transistors Q1 and Q2 are selected to form the circuit using CMOS transistors; in the power switch module used in high-voltage, high-current circuit scenarios, the two switching transistors Q1 and Q2 are selected to form the circuit using IGBT transistors.

[0038] In addition, for power switch modules used in AC circuit scenarios, the above-mentioned power switch circuit design with added AC / DC converter can be adopted. The live wire terminal and neutral wire terminal connected to the input terminal of the AC / DC converter are led out by wires and used to connect to the live wire terminal and neutral wire terminal of the external AC power supply, respectively.

[0039] For applications requiring automatic on / off control via external control signals, the power switch circuit in the power switch module can adopt the design described above, which adds a control signal input terminal GPIO. The control signal input terminal GPIO is led out through wires to connect to external control signals.

[0040] As a preferred option, epoxy resin is the preferred insulating material for insulating encapsulation in power switch modules, as it is a mature technology, inexpensive, and provides good insulation.

[0041] The power switch module product designed in this utility model inherits the characteristics of the aforementioned power switch circuit, which has strong versatility and wide application range. It can easily design power switch module products suitable for different circuit scenarios such as low frequency, high frequency, DC, AC, weak current, and strong current. At the same time, the circuit modularization technology is mature, the cost is low, the service life is long, and the operation is stable and reliable, which has a good market prospect.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. An electronically isolated power switching circuit, characterized in that, It includes a first optical coupler U1 and a second optical coupler U2, as well as a first switch Q1 and a second switch Q2; The anodes on the input side of the first optocoupler U1 and the second optocoupler U2 are both connected to the DC power supply terminal. The cathodes on the input side of the first optocoupler U1 and the second optocoupler U2 are respectively connected in parallel to one end of the enable switch SW1 through grounding resistor R3 and grounding resistor R4. The other end of the enable switch SW1 is connected to the DC power supply ground. The DC power supply is converted into a first isolated DC power supply and a second isolated DC power supply by a first isolated DC / DC converter U4 and a second isolated DC / DC converter U5, respectively. The anode of the first optocoupler U1 is connected to the first isolated DC power supply terminal, the cathode of the first optocoupler U1 is connected to the gate of the first switch Q1 through the protection resistor R2, the drain of the first switch Q1 is connected to the ground of the first isolated DC power supply, and the gate of the first switch Q1 is also connected to the ground of the first isolated DC power supply through the grounding resistor R1. The anode of the output side of the second optocoupler U2 is connected to the second isolated DC power supply terminal, the cathode of the output side of the second optocoupler U2 is connected to the gate of the second switch Q2 through the protection resistor R5, the drain of the second switch Q2 is connected to the ground of the second isolated DC power supply, and the gate of the second switch Q2 is also connected to the ground of the second isolated DC power supply through the grounding resistor R6. The source of the first switch Q1 is connected to the source of the second switch Q2, and the drain of the first switch Q1 and the drain of the second switch Q2 serve as two output connection terminals for the power switch circuit to access the working circuit.

2. The electronically isolated power switch circuit according to claim 1, characterized in that, The first switch Q1 and the second switch Q2 are CMOS transistors or IGBT transistors.

3. The electronically isolated power switch circuit according to claim 1, characterized in that, It also includes an AC / DC converter, the input of which is connected to a live wire terminal and a neutral wire terminal for accessing AC power; the AC power is converted into DC power by the AC / DC converter.

4. The electronically isolated power switch circuit according to claim 1, characterized in that, It also includes a control signal input terminal GPIO for receiving external control signals; the control signal input terminal GPIO is connected at the parallel node of the grounding resistor R3 and the grounding resistor R4.

5. A power switch module, characterized in that, The power switch module includes an electronically isolated power switch circuit as described in claim 1; the power switch circuit is integrated on a circuit board and is insulated and encapsulated with insulating material; the DC power supply terminal and DC power ground of the power switch circuit are led out through wires for connecting to an external DC power supply; the two output connection terminals of the power switch circuit are led out through wires for connecting to the working circuit.

6. The power switch module according to claim 5, characterized in that, The first switching transistor Q1 and the second switching transistor Q2 in the power switching circuit are CMOS transistors or IGBT transistors.

7. The power switch module according to claim 5, characterized in that, The power switch circuit also includes an AC / DC converter, the input terminal of which is connected to a live wire terminal and a neutral wire terminal for connecting to an AC power source; the AC power source is converted into DC power source by the AC / DC converter; the live wire terminal and the neutral wire terminal are led out by wires for connecting to the live wire terminal and the neutral wire terminal of an external AC power source, respectively.

8. The power switch module according to claim 5, characterized in that, The power switch circuit also includes a control signal input terminal GPIO for receiving external control signals; the control signal input terminal GPIO is connected at the parallel node of the grounding resistor R3 and the grounding resistor R4; the control signal input terminal GPIO is led out through a wire for connecting to external control signals.

9. The power switch module according to claim 5, characterized in that, The insulating material used for insulating encapsulation is epoxy resin adhesive.

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