Surge protector and electronic equipment

Abstract

The embodiment of the invention discloses a surge protector and electronic equipment. The surge protector comprises a first protection device, a second protection device, a first auxiliary circuit and a second auxiliary circuit, the first end of the first protection device serves as the first end of the surge protector, the second end of the first protection device is connected with the first end of the second protection device, and the second end of the second protection device serves as the second end of the surge protector; the first end of the first auxiliary circuit is connected with the first end of the first protection device, and the second end is connected with the second end of the first protection device; the first end of the second auxiliary circuit is connected with the first end of the second protection device, and the second end is connected with the second end of the second protection device; and in the normal working state, the first protection device and the second protection device are controlled to be subjected to voltage sharing, and in the surge protection state, the first protection device and the second protection device are controlled to be conducted step by step. According to the scheme, the unification of high direct current withstand voltage and low residual voltage is realized.

Description

Technical Field

[0001] This invention relates to the field of circuit protection technology, and more particularly to a surge protector and electronic device. Background Technology

[0002] In electronic equipment, protective devices are usually used as primary protection to prevent damage to high-voltage input terminals caused by lightning surges, operational overvoltages, etc.

[0003] In practical applications, in order to meet the high DC withstand voltage insulation requirements of protective devices, the DC breakdown voltage of the protective devices is set very high. However, the pulse voltage is also very high. For surge protection, high pulse voltage means high residual voltage, which can easily cause damage to the equipment. Summary of the Invention

[0004] This invention provides a surge protector and electronic device to protect against the conflict between pulse voltage and insulation withstand voltage in high DC withstand voltage applications.

[0005] According to one aspect of the present invention, a surge protector is provided, comprising: a first protective device, a second protective device, a first auxiliary circuit, and a second auxiliary circuit; The first end of the first protective device serves as the first end of the surge protector, the second end of the first protective device is connected to the first end of the second protective device, and the second end of the second protective device serves as the second end of the surge protector. The first terminal of the first auxiliary circuit is connected to the first terminal of the first protective device, the second terminal of the first auxiliary circuit is connected to the second terminal of the first protective device, the first terminal of the second auxiliary circuit is connected to the first terminal of the second protective device, and the second terminal of the second auxiliary circuit is connected to the second terminal of the second protective device. The first auxiliary circuit and the second auxiliary circuit are configured to control the voltage equalization of the first protective device and the second protective device under normal operating conditions, and to control the first protective device and the second protective device to conduct step by step under surge protection conditions.

[0006] Optionally, the first protective device includes a first gas discharge tube, and the second protective device includes a second gas discharge tube; The first end of the first gas discharge tube serves as the first end of the surge protector, the second end of the first gas discharge tube is connected to the first end of the second gas discharge tube, and the second end of the second gas discharge tube serves as the second end of the surge protector.

[0007] Optionally, the breakdown voltage of the first gas discharge tube and the second gas discharge tube are the same.

[0008] Optionally, the first auxiliary circuit includes a first voltage divider unit and a second voltage divider unit, and the second auxiliary circuit includes a third voltage divider unit and a fourth voltage divider unit; The first end of the first voltage divider unit is connected to the first end of the first protective device; the second end of the first voltage divider unit is connected to the first end of the second voltage divider unit; the second end of the second voltage divider unit is connected to the second end of the first protective device; the first end of the fourth voltage divider unit is connected to the first end of the second protective device; the second end of the fourth voltage divider unit is connected to the first end of the third voltage divider unit; and the second end of the third voltage divider unit is connected to the second end of the second protective device. The second voltage divider unit is used to control the impedance of the first auxiliary circuit according to the voltage frequency connected to the surge protector; the fourth voltage divider unit is used to control the impedance of the second auxiliary circuit according to the voltage frequency connected to the surge protector. Under normal operating conditions, the difference between the impedance of the first auxiliary circuit and the impedance of the second auxiliary circuit is less than or equal to a preset value; under surge protection conditions, the impedance of the first auxiliary circuit is greater than the impedance of the second auxiliary circuit.

[0009] Optionally, the first voltage divider unit includes a first resistor, and the second voltage divider unit includes a second resistor and a first capacitor. The first end of the first resistor is connected to the first end of the first protective device, the second end of the first resistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the second end of the first protective device, the first end of the second resistor is connected to the first end of the first capacitor, and the second end of the second resistor is connected to the second end of the first capacitor. The third voltage divider unit includes a third resistor, and the fourth voltage divider unit includes a fourth resistor and a second capacitor. The first end of the second capacitor is connected to the first end of the second protective device, the second end of the second capacitor is connected to the first end of the third resistor, the second end of the third resistor is connected to the second end of the second protective device, the first end of the fourth resistor is connected to the first end of the second capacitor, and the second end of the fourth resistor is connected to the second end of the second capacitor.

[0010] Optionally, the resistance value of the second resistor is equal to the resistance value of the fourth resistor, the resistance value of the first resistor is greater than the resistance value of the third resistor, and the resistance value of the first resistor is less than the resistance value of the second resistor.

[0011] Optionally, the surge protector further includes a circuit board, with the first protective device and the second protective device disposed on one side of the circuit board, and the first auxiliary circuit and the second auxiliary circuit disposed on the other side of the circuit board.

[0012] Optionally, the surge protector further includes a buffer layer that covers the first protective device, the second protective device, the first auxiliary circuit, and the second auxiliary circuit.

[0013] Optionally, the surge protector further includes a protective layer that covers the buffer layer and is fixedly connected to the first end and the second end of the surge protector.

[0014] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising the surge protector provided in any embodiment of the present invention.

[0015] The technical solution provided by this invention, under normal operating conditions, controls the first and second protective devices to equalize voltage, allowing them to jointly withstand high voltage. Under surge protection conditions, the first and second protective devices are controlled to conduct in staggered shifts, causing the high-frequency surge pulse voltage to preferentially trigger the first protective device, thus using the pulse voltage of a single protective device as the protection threshold of the surge protector. Compared to traditional solutions using a single high-voltage protective device, this solution, through the configuration of the first and second auxiliary circuits, can reduce the breakdown voltage level of a single protective device. In other words, high withstand voltage and low residual voltage can be achieved using a low-voltage protective device, thereby achieving a balance between high DC withstand voltage and low residual voltage.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a surge protector provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another surge protector provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of another surge protector provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of another surge protector provided in an embodiment of the present invention; Figure 5This is a schematic diagram of another surge protector provided in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Figure 1 This is a schematic diagram of a surge protector provided in an embodiment of the present invention, with reference to... Figure 1 The surge protector provided in this embodiment includes a first protective device 10, a second protective device 20, a first auxiliary circuit 30, and a second auxiliary circuit 40; The first end of the first protective device 10 serves as the first end O1 of the surge protector, and the second end of the first protective device 10 is connected to the first end of the second protective device 20. The second end of the second protective device 20 serves as the second end O2 of the surge protector. The first terminal of the first auxiliary circuit 30 is connected to the first terminal of the first protective device 10, and the second terminal of the first auxiliary circuit 30 is connected to the second terminal of the first protective device 10. The first terminal of the second auxiliary circuit 40 is connected to the first terminal of the second protective device 20, and the second terminal of the second auxiliary circuit 40 is connected to the second terminal of the second protective device 20. The first auxiliary circuit 30 and the second auxiliary circuit 40 are configured to control the voltage equalization of the first protective device 10 and the second protective device 20 under normal operating conditions, and to control the first protective device 10 and the second protective device 20 to conduct step by step under surge protection conditions.

[0022] Specifically, the first terminal O1 and the second terminal O2 of the surge protector are used to connect to the power supply voltage. For example, in the application scenario of an on-board charger, the first terminal O1 and the second terminal O2 of the surge protector are connected to the live wire and the neutral wire, respectively, to provide surge protection for the chips and components in the on-board charger. Under normal operating conditions (power frequency), the impedance of the first auxiliary circuit 10 and the impedance of the second auxiliary circuit 40 are equal or approximately equal, so that the first protection device 10 and the second protection device 20 are evenly divided in voltage. At this time, the withstand voltage of the surge protector is the sum of the withstand voltages of the first protection device 10 and the second protection device 20, which can meet the high withstand voltage requirement of the surge protector. Here, by configuring the first protection device 10 and the second protection device 20, the voltage after equalization of the first protection device 10 and the second protection device 20 does not exceed their respective breakdown voltages.

[0023] In surge protection mode (when a high-frequency surge voltage occurs), the impedances of the first auxiliary circuit 30 and the second auxiliary circuit 40 change, resulting in different voltage divisions between the first protective device 10 and the second protective device 20. This causes the first protective device 10 and the second protective device 20 to break down step by step, thereby discharging the surge current. For example, if the impedance of the first auxiliary circuit 30 is greater than that of the second auxiliary circuit 40, the voltage division of the first protective device 10 will be greater than that of the second protective device 20. The high-frequency surge voltage will preferentially divide the voltage across the first protective device 10. When the voltage reaches the breakdown voltage of the first protective device 10, the first protective device 10 will conduct first. After the first protective device 10 conducts, the second protective device 20 will divide the remaining voltage, causing it to break down. This will create a connection between the first terminal O1 and the second terminal O2 of the surge protector, discharging the surge current.

[0024] The technical solution provided in this invention, under normal operating conditions, controls the first protective device 10 and the second protective device 20 to perform voltage equalization, so that the first protective device 10 and the second protective device 20 jointly withstand high voltage. Under surge protection conditions, controls the first protective device 10 and the second protective device 20 to conduct in staggered shifts, so that the surge high-frequency pulse voltage preferentially triggers the first protective device 10, thereby using the pulse voltage of a single protective device as the protection threshold of the surge protector. Compared with the traditional technical solution that uses a single high-voltage protective device, this solution, by configuring the first auxiliary circuit 30 and the second auxiliary circuit 40, can reduce the breakdown voltage level of a single protective device, that is, using a low-voltage protective device can achieve the purpose of high withstand voltage and low residual voltage, thus achieving a balance between high DC withstand voltage and low residual voltage.

[0025] For example, taking a DC withstand voltage of 2850V as an example, when using traditional high-voltage protection devices, the breakdown voltage of these devices is typically set to above 3000V, while the pulse voltage can reach 5000V. However, when using the technical solution provided in this embodiment, since the first protection device 10 and the second protection device 20 jointly withstand high voltage, the breakdown voltage of the first protection device 10 and the second protection device 20 can be set below 3000V, such as 2000V. Therefore, the surge protector can withstand a voltage of 4000V, which is greater than the 2850V withstand voltage requirement. Furthermore, for a low-voltage protection device of 2000V, its pulse voltage is much less than 5000V, achieving low residual voltage.

[0026] Figure 2 This is a schematic diagram of another surge protector provided in an embodiment of the present invention, with reference to... Figure 2 Based on the above embodiments, optionally, the first protective device 10 includes a first gas discharge tube G1, and the second protective device 20 includes a second gas discharge tube G2. The first end of the first gas discharge tube G1 serves as the first end of the surge protector, and the second end of the first gas discharge tube G1 is connected to the first end of the second gas discharge tube G2. The second end of the second gas discharge tube G2 serves as the second end of the surge protector.

[0027] Under normal operating conditions, the DC breakdown voltage of the gas discharge tube is stable. The first gas discharge tube G1 and the second gas discharge tube G2, connected in series, can evenly divide the voltage, meeting the withstand voltage requirements of the surge protector. The response time of the gas discharge tube is in the nanosecond range, allowing it to be quickly triggered by high-frequency pulse voltages to achieve surge protection.

[0028] The technical solution provided in this embodiment, by connecting the first gas discharge tube G1 and the second gas discharge tube G2 in series, enables the surge protector to retain the high withstand voltage capability of the high-voltage gas discharge tube, and also enables the surge protector to have the low pulse voltage and low residual voltage effect of the low-voltage gas discharge tube, thus effectively solving the contradiction between high DC withstand voltage and low residual voltage.

[0029] Optionally, the breakdown voltages of the first gas discharge tube G1 and the second gas discharge tube G2 are the same, so that the first gas discharge tube G1 and the second gas discharge tube G2 can achieve better voltage equalization.

[0030] In one embodiment, the first gas discharge tube G1 is identical to the second gas discharge tube G2.

[0031] Figure 3 This is a schematic diagram of another surge protector provided in an embodiment of the present invention, with reference to... Figure 3Based on the above embodiments, optionally, the first auxiliary circuit 30 includes a first voltage divider unit 301 and a second voltage divider unit 302, and the second auxiliary circuit 40 includes a third voltage divider unit 401 and a fourth voltage divider unit 402; the first end of the first voltage divider unit 301 is connected to the first end of the first protective device 10, the second end of the first voltage divider unit 301 is connected to the first end of the second voltage divider unit 302, the second end of the second voltage divider unit 302 is connected to the second end of the first protective device 10, the first end of the fourth voltage divider unit 402 is connected to the first end of the second protective device 20, the second end of the fourth voltage divider unit 402 is connected to the first end of the third voltage divider unit 401, and the second end of the third voltage divider unit 401 is connected to the second end of the second protective device 20; the second voltage divider unit 302 is used to control the impedance of the first auxiliary circuit 30 according to the voltage frequency connected to the surge protector, and the fourth voltage divider unit 402 is used to control the impedance of the second auxiliary circuit 40 according to the voltage frequency connected to the surge protector.

[0032] Under normal operating conditions, the impedance difference between the first auxiliary circuit 30 and the second auxiliary circuit 40 is less than or equal to a preset value. Under surge protection conditions, the impedance of the first auxiliary circuit 20 is greater than the impedance of the second auxiliary circuit 40.

[0033] Specifically, the second voltage divider unit 302 and the fourth voltage divider unit 402 can control the impedance of the first auxiliary circuit 20 and the second auxiliary circuit 20 respectively according to the voltage frequency of the first terminal O1 and the second terminal O2 of the surge protector. For example, under normal operating conditions, the impedance of the first auxiliary circuit 30 is equal to the sum of the impedances of the first voltage divider unit 301 and the second voltage divider unit 302, and the impedance of the second auxiliary circuit 40 is equal to the sum of the impedances of the third voltage divider unit 401 and the fourth voltage divider unit 402. The sum of the impedances of the first voltage divider unit 301 and the second voltage divider unit 302 is approximately equal to the sum of the impedances of the third voltage divider unit 401 and the fourth voltage divider unit 402. Therefore, the impedance of the first auxiliary circuit 30 is approximately equal to the impedance of the second auxiliary circuit 40, and the first gas discharge tube G1 and the second gas discharge tube G2 divide the voltage equally. The withstand voltage of the surge protector is the sum of the withstand voltages of the first gas discharge tube G1 and the second gas discharge tube G2, which can meet the high withstand voltage requirements of the surge protector.

[0034] In surge protection mode, the impedance of the first auxiliary circuit 20 is equal to the impedance of the first voltage divider unit 301, and the impedance of the second auxiliary circuit 40 is equal to the impedance of the third voltage divider unit 401. The impedance of the first voltage divider unit 301 is greater than the impedance of the second auxiliary circuit 40. Therefore, the voltage division of the first gas discharge tube G1 is greater than that of the second gas discharge tube G2. The pulse voltage is preferentially divided onto the first gas discharge tube G1, causing it to conduct. The voltage across the first gas discharge tube G1 turns into a glowing voltage. The second gas discharge tube G2 divides the remaining voltage, causing it to break down. Simultaneously, the first gas discharge tube G1 and the second gas discharge tube G2 turn into an arcing voltage, and the surge protector conducts, discharging the surge current. Because the breakdown voltages of the first gas discharge tube G1 and the second gas discharge tube G2 are relatively small, they have lower pulse voltages, reducing the residual voltage of the surge protector and improving its safety and reliability.

[0035] Figure 4 This is a schematic diagram of another surge protector provided in an embodiment of the present invention, and specifically illustrates the specific structure of the surge protector. (Refer to...) Figure 4 Based on the above embodiments, optionally, the first voltage divider unit 301 includes a first resistor R1, and the second voltage divider unit 302 includes a second resistor R2 and a first capacitor C1. The first end of the first resistor R1 is connected to the first end of the first protection device 10, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the second end of the first protection device 10, the first end of the second resistor R2 is connected to the first end of the first capacitor C1, and the second end of the second resistor R2 is connected to the second end of the first capacitor C1. The third voltage divider unit 401 includes a third resistor R3, and the fourth voltage divider unit 402 includes a fourth resistor R4 and a second capacitor C2. The first end of the second capacitor C2 is connected to the first end of the second protective device 20, and the second end of the second capacitor C2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is connected to the second end of the second protective device 20, and the first end of the fourth resistor R4 is connected to the first end of the second capacitor C2. The second end of the fourth resistor R4 is connected to the second end of the second capacitor C2.

[0036] Among them, the resistance of the second resistor R2 is equal to the resistance of the fourth resistor R4, the resistance of the first resistor R1 is greater than the resistance of the third resistor R3, and the resistance of the first resistor R1 is less than the resistance of the second resistor R2.

[0037] Specifically, the impedance difference between the first auxiliary circuit 30 and the second auxiliary circuit 40 is achieved by utilizing the difference in capacitive reactance at different frequencies (capacitive reactance is inversely proportional to frequency). Under normal operating conditions, the voltage frequency across the surge protector is low (e.g., power frequency), and the capacitive reactance of the first capacitor C1 and the second capacitor C2 is infinite, equivalent to an open circuit. The impedance of the first auxiliary circuit 30 is equal to the sum of the resistances of the first resistor R1 and the second resistor R2, and the impedance of the second auxiliary circuit 40 is equal to the sum of the resistances of the third resistor R3 and the fourth resistor R4. Here, the resistance of the second resistor R2 is much greater than the resistance of the first resistor R1, and the resistance of the fourth resistor R4 is much greater than the resistance of the third resistor R3. For example, the resistance of the first resistor R1 is 150KΩ, the resistance of the third resistor R3 is 10KΩ, and the resistances of the second resistor R2 and the fourth resistor R4 are both 100MΩ. Therefore, the sum of the resistances of the first resistor R1 and the second resistor R2 is approximately equal to the sum of the resistances of the third resistor R3 and the fourth resistor R4, and the difference between the two is less than or equal to a preset value. The first gas discharge tube G1 and the second gas discharge tube G3 have an average voltage division.

[0038] In surge protection mode, the voltage frequency across the surge protector is relatively high. The capacitive reactance of the first capacitor C1 and the second capacitor C2 is small, equivalent to a short circuit. The impedance of the first auxiliary circuit 30 is equal to the resistance of the first resistor R1, and the impedance of the second auxiliary circuit 40 is equal to the resistance of the third resistor R3. The first gas discharge tube G1 and the second gas discharge tube G3 divide the voltage according to the resistance values ​​of the first resistor R1 and the third resistor R3. For example, if the resistance of the first resistor R1 is 150KΩ and the resistance of the third resistor R3 is 10KΩ, then the first gas discharge tube G1 and the second gas discharge tube G2 divide the voltage in a 15:1 ratio, with the first gas discharge tube G1 conducting first, followed by the second gas discharge tube G2. By staggering the discharge of the first gas discharge tube G1 and the second gas discharge tube G3, the pulse voltage of the surge protector can be effectively reduced, thus achieving both low residual voltage and high withstand voltage.

[0039] Traditional technical solutions require a pulse voltage of over 6000V to meet the 3300V withstand voltage requirement. This embodiment takes an example where both the first gas discharge tube G1 and the second gas discharge tube G2 have a breakdown voltage of 2000V. Experimental verification shows that the surge protector provided in this embodiment can stably achieve a DC withstand voltage of over 3300V, with a pulse voltage below 3000V. This ensures that the pulse voltage is below the withstand voltage, and discharge protection can be provided at voltages below 3000V.

[0040] Figure 5 This is a schematic diagram of another surge protector provided in an embodiment of the present invention, with reference to... Figure 4 and Figure 5Based on the above embodiments, optionally, the surge protector further includes a circuit board 100, with the first protective device 10 and the second protective device 20 disposed on one side of the circuit board 100, and the first auxiliary circuit 30 and the second auxiliary circuit 40 disposed on the other side of the circuit board 100. The first auxiliary circuit 30 is connected to the first protective device 10 via a via, and the second auxiliary circuit 40 is connected to the second protective device 20 via a via. The first protective device 10 and the second protective device 20 are located on the same side of the circuit board 100 and can be directly connected to each other. By disposing the first protective device 10, the second protective device 20, the first auxiliary circuit 30, and the second auxiliary circuit 40 all on the circuit board 100, the overall stability of the surge protector is improved, and packaging is facilitated.

[0041] Continue to refer to Figure 5 In this embodiment, the surge protector further includes a buffer layer 50, which covers the first protective device 10, the second protective device 20, the first auxiliary circuit 30, and the second auxiliary circuit 40.

[0042] Furthermore, the surge protector also includes a protective layer 60, which covers the buffer layer 50, and the protective layer 60 is fixedly connected to the first end O1 and the second end O2 of the surge protector.

[0043] Specifically, the buffer layer 50 can be vacuum-infused with a modified silicone resin with a high CTI (Comparative Tracking Index) value and high thermal conductivity to form a coating. This coating is then applied to the first protective device 10, the second protective device 20, the first auxiliary circuit 30, and the second auxiliary circuit 40. Together with the silicone oil layer of the protective device, it forms a composite insulation system to achieve a uniform electric field distribution, eliminate the risk of partial discharge caused by external environmental interference, ensure long-term insulation stability under high withstand voltage, and improve the reliability of protection.

[0044] In this embodiment, the buffer layer 50 needs to be installed after the gas discharge tube is sealed, and the buffer layer needs to have a low viscosity (e.g., less than 1000 mpa.s) to ensure that the buffer layer 50 can fully fill the complex three-dimensional space formed by the gas discharge tube and the auxiliary circuit, avoid air bubbles, improve the overall sealing performance of the surge protector, and improve its moisture resistance.

[0045] The protective layer 60 is located outside the buffer layer 50, completely covering it. The material of the protective layer 60 can be a high-strength modified epoxy resin with a Shore D strength greater than 80, providing a high-strength shell for the surge protector. The protective layer 60 penetrates and anchors to the outer surface of the buffer layer 50 and the root of the pins of the protective device (i.e., the first end O1 and the second end O2 of the surge protector), forming a mechanical interlock structure between the protective layer 60 and the buffer layer 50. This completely solves the problem of interface separation caused by weak adhesion between the buffer layer 50 and internal components under long-term vibration, easily meeting the stringent mechanical vibration requirements of the IEC60068-2-6 standard, achieving a balance between electrical performance, mechanical reliability, and production feasibility.

[0046] Optionally, embodiments of the present invention also provide an electronic device, which can be an on-board charger or any other device requiring protection against lightning surges, operational overvoltages, etc. The electronic device provided in these embodiments includes the surge protector provided in any embodiment of the present invention; therefore, this electronic device also possesses the beneficial effects described in the above embodiments.

[0047] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0048] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A surge protector, characterized in that, include: First protective device, second protective device, first auxiliary circuit and second auxiliary circuit; The first end of the first protective device serves as the first end of the surge protector, the second end of the first protective device is connected to the first end of the second protective device, and the second end of the second protective device serves as the second end of the surge protector. The first terminal of the first auxiliary circuit is connected to the first terminal of the first protective device, the second terminal of the first auxiliary circuit is connected to the second terminal of the first protective device, the first terminal of the second auxiliary circuit is connected to the first terminal of the second protective device, and the second terminal of the second auxiliary circuit is connected to the second terminal of the second protective device. The first auxiliary circuit and the second auxiliary circuit are configured to control the voltage equalization of the first protective device and the second protective device under normal operating conditions, and to control the first protective device and the second protective device to conduct step by step under surge protection conditions.

2. The surge protector according to claim 1, characterized in that, The first protective device includes a first gas discharge tube, and the second protective device includes a second gas discharge tube; The first end of the first gas discharge tube serves as the first end of the surge protector, the second end of the first gas discharge tube is connected to the first end of the second gas discharge tube, and the second end of the second gas discharge tube serves as the second end of the surge protector.

3. The surge protector according to claim 2, characterized in that, The breakdown voltages of the first gas discharge tube and the second gas discharge tube are the same.

4. The surge protector according to claim 1, characterized in that, The first auxiliary circuit includes a first voltage divider unit and a second voltage divider unit, and the second auxiliary circuit includes a third voltage divider unit and a fourth voltage divider unit; The first end of the first voltage divider unit is connected to the first end of the first protective device; the second end of the first voltage divider unit is connected to the first end of the second voltage divider unit; the second end of the second voltage divider unit is connected to the second end of the first protective device; the first end of the fourth voltage divider unit is connected to the first end of the second protective device; the second end of the fourth voltage divider unit is connected to the first end of the third voltage divider unit; and the second end of the third voltage divider unit is connected to the second end of the second protective device. The second voltage divider unit is used to control the impedance of the first auxiliary circuit according to the voltage frequency connected to the surge protector; the fourth voltage divider unit is used to control the impedance of the second auxiliary circuit according to the voltage frequency connected to the surge protector. Under normal operating conditions, the difference between the impedance of the first auxiliary circuit and the impedance of the second auxiliary circuit is less than or equal to a preset value. In surge protection mode, the impedance of the first auxiliary circuit is greater than the impedance of the second auxiliary circuit.

5. The surge protector according to claim 4, characterized in that, The first voltage divider unit includes a first resistor, and the second voltage divider unit includes a second resistor and a first capacitor. The first end of the first resistor is connected to the first end of the first protective device, the second end of the first resistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the second end of the first protective device, the first end of the second resistor is connected to the first end of the first capacitor, and the second end of the second resistor is connected to the second end of the first capacitor. The third voltage divider unit includes a third resistor, and the fourth voltage divider unit includes a fourth resistor and a second capacitor. The first end of the second capacitor is connected to the first end of the second protective device, the second end of the second capacitor is connected to the first end of the third resistor, the second end of the third resistor is connected to the second end of the second protective device, the first end of the fourth resistor is connected to the first end of the second capacitor, and the second end of the fourth resistor is connected to the second end of the second capacitor.

6. The surge protector according to claim 5, characterized in that, The resistance of the second resistor is equal to the resistance of the fourth resistor, the resistance of the first resistor is greater than the resistance of the third resistor, and the resistance of the first resistor is less than the resistance of the second resistor.

7. The surge protector according to claim 1, characterized in that, The surge protector also includes a circuit board, with the first protective device and the second protective device disposed on one side of the circuit board, and the first auxiliary circuit and the second auxiliary circuit disposed on the other side of the circuit board.

8. The surge protector according to claim 1, characterized in that, The surge protector also includes a buffer layer, which covers the first protective device, the second protective device, the first auxiliary circuit, and the second auxiliary circuit.

9. The surge protector according to claim 8, characterized in that, The surge protector further includes a protective layer that covers the buffer layer and is fixedly connected to the first end and the second end of the surge protector.

10. An electronic device, characterized in that, Includes the surge protector as described in any one of claims 1-9.

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