Three-way lightning protection over-temperature protection circuit

Abstract

The utility model discloses a three-path lightning protection over-temperature protection circuit. The circuit comprises a first piezoresistor, a second piezoresistor, a third piezoresistor, a first temperature fuse and a second temperature fuse. One end of the first piezoresistor is connected with a live wire through the first temperature fuse, and the other end of the first piezoresistor is connected with a ground wire; one end of the second piezoresistor is connected with the zero line through the second temperature fuse, and the other end of the second piezoresistor is connected with the ground wire; one end of the third piezoresistor is connected with a live wire through the first temperature fuse, and the other end of the third piezoresistor is connected with a zero wire through the second temperature fuse. According to the utility model, the use safety of the power strip can be improved, and the hidden danger of fire danger can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lightning protection circuit, specifically, a three-way lightning protection over-temperature protection circuit. BACKGROUND

[0002] At present, along with the continuous improvement of living standards, the electrical appliances purchased by each family are also more and more, and the demand for the power strip is also more and more, and people's requirement for the protection of the power strip is also higher and higher. Lightning is frequent in summer, and the situation of lightning damage to household electrical appliances occurs from time to time, how to increase the lightning protection function on the power strip is a problem to be solved in the prior art. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a three-way lightning protection over-temperature protection circuit to solve at least one technical issue in the above background art.

[0004] The three-way lightning protection over-temperature protection circuit of the utility model, including: first voltage-dependent resistor, second voltage-dependent resistor, third voltage-dependent resistor, first temperature fuse and second temperature fuse, one end of first voltage-dependent resistor is connected with fire line through first temperature fuse, and the other end is connected with ground wire, one end of second voltage-dependent resistor is connected with zero line through second temperature fuse, and the other end is connected with ground wire, one end of third voltage-dependent resistor is connected with fire line through first temperature fuse, and the other end is connected with zero line through second temperature fuse.

[0005] Optionally, the three-way lightning protection over-temperature protection circuit further includes: an indicator lamp circuit, one end of the indicator lamp circuit is connected between the third voltage-dependent resistor and the first temperature fuse, and the other end is connected between the third voltage-dependent resistor and the second temperature fuse.

[0006] Optionally, the indicator lamp circuit includes: an indicator lamp, a capacitor, a rectifier diode and a current-limiting resistor, the indicator lamp and the capacitor are connected in parallel, and then are connected in series with the rectifier diode and the current-limiting resistor.

[0007] Optionally, the first temperature fuse is close to the first voltage-dependent resistor and the third voltage-dependent resistor, and is used for disconnecting the circuit when the first voltage-dependent resistor or the third voltage-dependent resistor is over-temperature, and the second temperature fuse is close to the second voltage-dependent resistor and the third voltage-dependent resistor, and is used for disconnecting the circuit when the second voltage-dependent resistor or the third voltage-dependent resistor is over-temperature.

[0008] Optionally, the first temperature fuse is bundled between the first voltage-dependent resistor and the third voltage-dependent resistor.

[0009] Optionally, the second temperature fuse is bundled between the second voltage-dependent resistor and the third voltage-dependent resistor.

[0010] Optionally, the first temperature fuse is bundled together with the first and third varistors.

[0011] Optionally, the second temperature fuse is bundled together with the second and third varistors.

[0012] Optionally, the first temperature fuse, the first and third varistors are bundled together by a heat shrink sleeve.

[0013] Optionally, the second temperature fuse, the second and third varistors are bundled together by a heat shrink sleeve.

[0014] The utility model discloses beneficial effect is:

[0015] The utility model discloses a three -way lightning protection over -temperature protection circuit, this circuit can between live wire - ground wire, between zero line - ground wire and live wire - between zero line flow into high voltage lightning signal, through temperature fuse disconnect circuit, the circuit is applied to the socket in, can make the socket have lightning protection function, help to improve the security of socket use, reduce the fire risk hidden danger. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings. In the drawings:

[0017] Figure 1 It is the first schematic diagram of three -way lightning protection over -temperature protection circuit of the utility model embodiment;

[0018] Figure 2 It is the second schematic diagram of three -way lightning protection over -temperature protection circuit of the utility model embodiment.

[0019] In the drawings:

[0020] F1, first temperature fuse;

[0021] F2, second temperature fuse;

[0022] MOV1, first varistor;

[0023] MOV2, second varistor;

[0024] MOV3, third varistor;

[0025] LED, indicator light;

[0026] C, capacitor;

[0027] D, rectifier diode;

[0028] R1, R2, current limiting resistor;

[0029] L, L1, live wire;

[0030] N, N1, neutral wire. DETAILED DESCRIPTION

[0031] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion, for example, a system, product or device including a series of units does not have to be limited to only those units clearly listed, but can include other units not clearly listed or inherent to these products or devices.

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] As shown in Figure 1 and Figure 2 In one embodiment of the present application, the three-way lightning protection over-temperature protection circuit of the present application comprises: a first voltage-dependent resistor MOV1, a second voltage-dependent resistor MOV2, a third voltage-dependent resistor MOV3, a first temperature fuse F1 and a second temperature fuse F2.

[0035] As shown in Figure 1 and Figure 2 One end of the first voltage-dependent resistor MOV1 is connected with the live wire (L, L1) through the first temperature fuse F1, and the other end is connected with the ground wire.

[0036] As shown in Figure 1 and Figure 2 One end of the second voltage-dependent resistor MOV2 is connected with the neutral wire (N, N1) through the second temperature fuse F2, and the other end is connected with the ground wire.

[0037] AsFigure 1 and Figure 2 As shown, one end of the third varistor MOV3 is connected to the live wire (L, L1) through the first thermal fuse F1, and the other end is connected to the neutral wire (N, N1) through the second thermal fuse F2.

[0038] like Figure 1 and Figure 2 As shown, the three-way lightning and over-temperature protection circuit of this utility model also includes an indicator light circuit. One end of the indicator light circuit is connected between the third varistor MOV3 and the first thermal fuse F1, and the other end is connected between the third varistor MOV3 and the second thermal fuse F2.

[0039] like Figure 1 and Figure 2 As shown, the indicator light circuit of this utility model includes an indicator LED. The indicator LED will light up when the three-way surge protection and over-temperature protection circuit is activated, and will turn off when the first thermal fuse F1 or the second thermal fuse F2 disconnects the entire circuit.

[0040] The purpose of this utility model indicator circuit is to allow users to know in a timely manner whether the power strip's lightning protection function is working properly. When the indicator LED in the indicator circuit is lit, it means that the power strip's lightning protection function is working properly. When the indicator LED in the indicator circuit is off, it means that the power strip's lightning protection function has failed.

[0041] like Figure 1 and Figure 2 As shown, the indicator circuit of this utility model also includes a capacitor C, and the indicator LED and capacitor C are connected in parallel.

[0042] In this invention, the main function of capacitor C is to filter out high-frequency noise in the circuit, suppress transient voltage, and stabilize the voltage to a certain extent to protect the normal operation of the indicator LED.

[0043] In one embodiment of the present invention, the indicator circuit of the present invention further includes: a rectifier diode D and a current-limiting resistor (R1, R2), wherein the rectifier diode D and the current-limiting resistor (R1, R2) are connected in series with the indicator LED.

[0044] In this invention, the rectifier diode D is used to rectify the alternating current (AC) portion into direct current (DC), providing a stable DC power supply for the indicator LED.

[0045] In this invention, the current-limiting resistors (R1, R2) are used to limit the current and prevent the indicator LED from being damaged by overcurrent.

[0046] like Figure 1As shown in the utility model one embodiment, rectifier diode D, current limiting resistor (R1, R2) in indicator lamp circuit, indicator lamp LED are in series, capacitor C and indicator lamp LED are parallel.

[0047] As shown in the utility model another embodiment, current limiting resistor (R1, R2) in indicator lamp circuit, rectifier diode D, indicator lamp LED are in series, capacitor C and indicator lamp LED are parallel. Figure 2

[0048] In the utility model one embodiment, the position of first temperature fuse F1 is close to first voltage-dependent resistor MOV1 and third voltage-dependent resistor MOV3, for disconnecting circuit when first voltage-dependent resistor MOV1 and / or third voltage-dependent resistor MOV3 overtemperature.

[0049] The utility model three way lightning protection overtemperature protection circuit when high voltage lightning signal flows between fire line-ground line, at this time, it is common mode lightning signal, and lightning passes through first temperature fuse F1 and flows through first voltage-dependent resistor MOV1 and discharges to ground line GND, when lightning strike voltage is too high and current is too large, the temperature of first voltage-dependent resistor MOV1 rises, when rising to above the preset action temperature (for example, 111 degrees), the first temperature fuse F1 close to first voltage-dependent resistor MOV1 disconnects, thereby disconnecting circuit, and the temperature of first voltage-dependent resistor MOV1 no longer further rises, and the hidden danger of first voltage-dependent resistor MOV1 damage and fire is eliminated.

[0050] The utility model three way lightning protection overtemperature protection circuit when high voltage lightning signal flows between zero line-ground line, at this time, it is common mode lightning signal, and lightning passes through second temperature fuse F2 and flows through second voltage-dependent resistor MOV2 and discharges to ground line GND, when lightning strike voltage is too high and current is too large, the temperature of second voltage-dependent resistor MOV2 rises, when rising to above the preset action temperature (for example, 111 degrees), the second temperature fuse F2 close to second voltage-dependent resistor MOV2 disconnects, thereby disconnecting circuit, and the temperature of second voltage-dependent resistor MOV2 no longer further rises, and the hidden danger of second voltage-dependent resistor MOV2 damage and fire is eliminated.

[0051] ​The three-way lightning protection over-temperature protection circuit of the utility model can disconnect the circuit through the temperature fuse when high-voltage lightning signals flow between the live wire-ground wire, the zero wire-ground wire and the live wire-zero wire, and the circuit is applied to the power strip, so that the power strip has lightning protection function, which helps to improve the safety of the power strip and reduce the hidden danger of fire risk.

[0052] Therefore, the three-way lightning protection over-temperature protection circuit can disconnect the circuit through the temperature fuse when high-voltage lightning signals flow between the live wire-ground wire, the zero wire-ground wire and the live wire-zero wire, and the circuit is applied to the power strip, so that the power strip has lightning protection function, which helps to improve the safety of the power strip and reduce the hidden danger of fire risk.

[0053] In an embodiment of the utility model, the number of the first varistor MOV1, the second varistor MOV2 and the third varistor MOV3 can be one or more.

[0054] The three-way lightning protection over-temperature protection circuit of the utility model can disconnect the circuit through the temperature fuse when high-voltage lightning signals flow between the live wire-ground wire, the zero wire-ground wire and the live wire-zero wire, and the circuit is applied to the power strip, so that the power strip has lightning protection function, which helps to improve the safety of the power strip and reduce the hidden danger of fire risk.

[0055] The three-way lightning protection over-temperature protection circuit of the utility model can disconnect the circuit through the temperature fuse when high-voltage lightning signals flow between the live wire-ground wire, the zero wire-ground wire and the live wire-zero wire, and the circuit is applied to the power strip, so that the power strip has lightning protection function, which helps to improve the safety of the power strip and reduce the hidden danger of fire risk.

[0056] The three-way lightning protection over-temperature protection circuit of the utility model can disconnect the circuit through the temperature fuse when high-voltage lightning signals flow between the live wire-ground wire, the zero wire-ground wire and the live wire-zero wire, and the circuit is applied to the power strip, so that the power strip has lightning protection function, which helps to improve the safety of the power strip and reduce the hidden danger of fire risk.

[0057] Therefore, the three-way lightning protection over-temperature protection circuit, by setting the indicator light, facilitates the user to identify whether the lightning protection of the power strip is invalid, can further improve the safety of the power strip when using, and reduce the hidden danger of fire risk.

[0058] In one embodiment of the utility model, first temperature fuse F1 is tied between first voltage-dependent resistor MOV1 and third voltage-dependent resistor MOV3.

[0059] In one embodiment of the utility model, second temperature fuse F2 is tied between second voltage-dependent resistor MOV2 and third voltage-dependent resistor MOV3.

[0060] In one embodiment of the utility model, first temperature fuse F1 is tied together with first voltage-dependent resistor MOV1 and third voltage-dependent resistor MOV3.

[0061] In one embodiment of the utility model, second temperature fuse F2 is tied together with second voltage-dependent resistor MOV2 and third voltage-dependent resistor MOV3.

[0062] In one embodiment of the utility model, first temperature fuse F1, first voltage-dependent resistor MOV1 and third voltage-dependent resistor MOV3 are tied together through heat shrink sleeve.

[0063] In one embodiment of the utility model, second temperature fuse F2, second voltage-dependent resistor MOV2 and third voltage-dependent resistor MOV3 are tied together through heat shrink sleeve.

[0064] Heat shrink sleeve is a common and practical insulation protection tool, which is widely used in electrical and electronic equipment. In the utility model, the use of heat shrink sleeve can quickly and tightly tie temperature fuse and voltage-dependent resistor together, effectively improving the response speed of temperature sensing.

[0065] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A three-way lightning protection over-temperature protection circuit, characterized in that, Comprising: a first pressure sensitive resistor, a second pressure sensitive resistor, a third pressure sensitive resistor, a first temperature fuse and a second temperature fuse; one end of the first pressure sensitive resistor is connected with a fire wire through the first temperature fuse, and the other end is connected with a ground wire; one end of the second pressure sensitive resistor is connected with a zero wire through the second temperature fuse, and the other end is connected with a ground wire; one end of the third pressure sensitive resistor is connected with a fire wire through the first temperature fuse, and the other end is connected with a zero wire through the second temperature fuse.

2. The three-way lightning protection over-temperature protection circuit according to claim 1, characterized in that, Further comprising: an indicator light circuit; one end of the indicator light circuit is connected between the third pressure sensitive resistor and the first temperature fuse, and the other end is connected between the third pressure sensitive resistor and the second temperature fuse.

3. The three-way lightning protection over-temperature protection circuit according to claim 2, characterized in that, The indicator light circuit comprises an indicator light, a capacitor, a rectifier diode and a current limiting resistor, and the indicator light and the capacitor are connected in parallel and then connected in series with the rectifier diode and the current limiting resistor.

4. The three-way lightning protection over-temperature protection circuit according to any one of claims 1 to 3, characterized in that, The first temperature fuse is located close to the first pressure sensitive resistor and the third pressure sensitive resistor, and is used to disconnect the circuit when the first pressure sensitive resistor or the third pressure sensitive resistor is overheated. The second temperature fuse is located close to the second pressure sensitive resistor and the third pressure sensitive resistor, and is used to disconnect the circuit when the second pressure sensitive resistor or the third pressure sensitive resistor is overheated.

5. The three-way lightning protection over-temperature protection circuit of claim 4, wherein, The first temperature fuse is bundled between the first pressure sensitive resistor and the third pressure sensitive resistor.

6. The three-way lightning protection over-temperature protection circuit of claim 4, wherein, The second temperature fuse is bundled between the second pressure sensitive resistor and the third pressure sensitive resistor.

7. The three-way lightning protection over-temperature protection circuit of claim 5, wherein, The first temperature fuse is bundled with the first pressure sensitive resistor and the third pressure sensitive resistor.

8. The three-way lightning protection over-temperature protection circuit of claim 6, wherein, The second temperature fuse is bundled with the second pressure sensitive resistor and the third pressure sensitive resistor.

9. The three-way lightning protection over-temperature protection circuit of claim 7, wherein, The first temperature fuse, the first pressure sensitive resistor and the third pressure sensitive resistor are bundled together by a heat shrink sleeve.

10. The three-way lightning protection over-temperature protection circuit of claim 8, wherein, The second temperature fuse, the second pressure sensitive resistor and the third pressure sensitive resistor are bundled together by a heat shrink sleeve.

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