CN217882847U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
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- CN217882847U CN217882847U CN202121847660.5U CN202121847660U CN217882847U CN 217882847 U CN217882847 U CN 217882847U CN 202121847660 U CN202121847660 U CN 202121847660U CN 217882847 U CN217882847 U CN 217882847U
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Abstract
The utility model discloses a surge protection circuit. The surge protection circuit aims to solve the problems that a piezoresistor in the existing surge protection circuit has large leakage current, and when the energy of the piezoresistor exceeds the rated capacity of the piezoresistor in the transient overvoltage suppression process, the piezoresistor is damaged due to overheating and is in a low-resistance state. The utility model comprises a gas discharge module, a voltage dependent resistor module and a CLC filter module which are connected in sequence, wherein the gas discharge module releases energy generated in the voltage regulation process of the surge protection circuit, the voltage dependent resistor module clamps surge voltage and absorbs redundant current, and the CLC filter module plays a role in filtering output voltage and also plays an average role in the surge voltage; the utility model discloses effectively improve the anti surge performance of circuit, reduce the circuit volume, improve the stability of circuit and the life of component simultaneously.
Description
Technical Field
The present disclosure relates to protection circuits, and particularly to a surge protection circuit.
Background
In the existing surge protection circuit, the piezoresistor has larger capacitance junctions, larger leakage current exists, and the piezoresistor is aged, so that the service life of the piezoresistor is shortened; when the voltage dependent resistor is over the rated capacity when suppressing transient overvoltage, the voltage dependent resistor will be damaged by overheat and will be in low resistance state, so that it is very unsafe to generate heat continuously and even cause fire, and in this case, no safety resistor and specific discharge structure are provided to release the voltage-regulating energy.
For example, a "three-phase anti-surge protection circuit" disclosed in chinese patent literature, publication No. CN207082840U includes a first stage surge protection circuit, a trip coil KA, a second stage surge protection varistor RV5, and a control circuit, which cannot handle leakage current of the varistor, and does not have a specific discharge structure to release energy for voltage regulation.
Disclosure of Invention
The surge protection circuit mainly solves the problems that in the prior art, the leakage current of a piezoresistor in the surge protection circuit is large, and when the energy of the piezoresistor exceeds the rated capacity of the piezoresistor in the process of suppressing transient overvoltage, the piezoresistor is damaged due to overheating and is in a low-resistance state; a surge protection circuit for a gas discharge module is provided to dilute energy generated by voltage regulation of the surge circuit, thereby protecting the circuit and reducing the possibility of overheating and ignition.
The technical problem of the invention is mainly solved by the following technical scheme:
a surge protection circuit comprises a gas discharge module, a voltage dependent resistor module and a CLC filter module which are sequentially connected in parallel, wherein the gas discharge module comprises a PCB provided with a hollow window and a routing copper foil on the surface of the PCB, the routing copper foil is provided with a discharge tip, the discharge tip points to the hollow window, and the vertex of the discharge tip is positioned on the edge of the hollow window; the gas discharge module is provided with an input end and an output end, one end of each piece of wiring copper foil in the length direction is arranged at the input end, the output end is arranged at the other end of each piece of wiring copper foil in the length direction, the input end is respectively connected with the AC input, and a first safety resistor F1 is arranged on a connecting branch. The wiring copper foil is used as a conventional wiring for current so as to facilitate the current to flow; the discharge tip ionizes gas between the hollow windows through the tip discharge principle to release energy generated by voltage regulation in the surge circuit; the first fuse resistor F1 is fused under high voltage to play a role of a fuse, so that the whole circuit is protected; in addition, the voltage dependent resistor module clamps the voltage of the surge voltage and absorbs redundant current, and the CLC filtering module plays a role in filtering the output voltage and also plays an average role in the surge voltage.
Preferably, the hollow window contains air and/or inert gas, the bare copper foil with a plurality of tips is used as an electrode for tip discharge, the gas between the hollow windows is ionized, and the energy generated by voltage regulation in the surge circuit is released.
Preferably, the trace copper foils are symmetrically arranged on two sides of the hollow window along the length direction of the PCB, a plurality of exposed copper foils are arranged on the trace copper foils at intervals, the discharge tips are arranged on the exposed copper foils, and the exposed copper foils containing the discharge tips are used as tip discharge electrodes and used for absorbing energy by tip discharge.
Preferably, the varistor module comprises a varistor VR, a second safety resistor F2 and a transient suppression diode TVS, one end of the varistor VR is connected with one end of the transient suppression diode TVS, the other end of the varistor VR is connected with one end of the second safety resistor F2, the other end of the transient suppression diode TVS is connected with a first output end of the gas discharge module, and the other end of the second safety resistor F2 is connected with a second output end of the gas discharge module. The voltage dependent resistor VR absorbs surge voltage below the residual voltage of the voltage dependent resistor VR, and the transient suppression diode TVS reduces the overall distributed capacitance to reduce leakage current, thereby being beneficial to reducing the heating of the voltage dependent resistor and prolonging the service life of the voltage dependent resistor; the second fuse resistor F2 will be blown when the varistor is damaged and reduced to a low value, so as to prevent unsafe factors such as fire.
Preferably, the rated voltage range of the piezoresistor is set to 270-561V, and surge voltage under residual voltage of the piezoresistor is absorbed; the rated voltage range of the transient suppression diode is set to be 20-100V, the overall distributed capacitance is reduced, leakage current is reduced, heating of the piezoresistor is reduced, and the service life of the piezoresistor is prolonged.
Preferably, the CLC filter module includes an X capacitor C1, an X capacitor C2, and an inductor L, wherein one end of the X capacitor C1 is connected to a first output end of the gas discharge module, and the other end is connected to a second output end of the gas discharge module; one end of the inductor L is connected with one end of the X capacitor C2, the other end of the inductor L is connected with a first output end of the gas discharge module, and the other end of the X capacitor C2 is connected with a second output end of the gas discharge module; the CLC filtering module not only has a filtering effect on the output voltage, but also has an averaging effect on the surge voltage.
Preferably, the voltage across the X capacitor C2 is output to the switching power supply circuit, and the voltage is the output voltage of the surge circuit, so that the waveform is stable.
The invention has the beneficial effects that: the gas discharge module is adopted to release energy generated by the surge circuit, so that the effects of effectively improving the anti-surge performance of the circuit, improving the stability of the circuit and prolonging the service life of elements are achieved.
Drawings
Fig. 1 is a circuit schematic of a surge protection circuit.
In the figure, 1 is a gas discharge module, 2 is a piezoresistor module, 3 is a CLC filtering module, 4 is a PCB board, 5 is a hollow window, 6 is a wiring copper foil, 6-1 is a bare copper foil, 7 is a discharge tip, 8 is a power switch circuit and 9 is an AC input.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
as shown in fig. 1, the surge protection circuit of this embodiment includes a gas discharge module 1, a varistor module 2, and a CLC filter module 3, which are connected in sequence, where the gas discharge module 1 includes a PCB 4 having a hollow window 5 and a trace copper foil 6 attached to a surface layer thereof, the trace copper foils 6 are symmetrically distributed at two sides of the hollow window 5, and the trace copper foils 6 are arranged along a length direction of the PCB 4, two ends of each trace copper foil 6 are respectively used as an input end and an output end of the gas discharge module 1, where the input end is connected to an AC input 9, and the output end is connected to two ends of the varistor module; the input end of the gas discharge module 1 is connected with a first fuse resistor F1 on a connecting branch of the AC input, and the fuse resistor F1 can absorb certain energy to reduce input surge voltage while being used as a fusing fuse; the routing copper foil 6 comprises a bare copper foil 6-1, the bare copper foil 6-1 comprises a plurality of discharge tips 7, the discharge tips 7 point to the hollow window 5, the top points of the discharge tips are positioned on the edge of the hollow window 5, gas exists between the hollow windows 5, the discharge tips 7 arranged on the bare copper foil 6-1 and the hollow window 5 form a tip gas discharge structure, the bare copper foil 6-1 is a discharge electrode, and the gas between the hollow windows 5 is ionized to release energy generated by voltage regulation in a surge circuit; the range of the distance between the exposed copper foils 6-1 on the two sides of the hollow window 5 is 0.5-6mm, the distance is set according to the surge voltage to be protected, and the surge voltage to be protected is 0.5-6kv when the distance is 1mm per 1kv of surge voltage.
The varistor module 2 comprises a varistor VR, a second safety resistor F2 and a transient suppression diode TVS, one end of the varistor VR is connected with one end of the transient suppression diode TVS, the other end of the varistor VR is connected with one end of the second safety resistor F2, the other end of the transient suppression diode TVS is connected with a first output end of the gas discharge module, and the other end of the second safety resistor F2 is connected with a second output end of the gas discharge module 1. The transient suppression diode TVS is a bidirectional transient suppression diode and can absorb instantaneous large pulse power in a surge circuit in a positive direction and a negative direction; surge voltage below the residual voltage of the voltage dependent resistor VR is absorbed by the voltage dependent resistor VR, and the total distributed capacitance is reduced by the transient suppression diode TVS so as to reduce leakage current, facilitate the reduction of the heating of the voltage dependent resistor and prolong the service life of the voltage dependent resistor; the second fuse resistor F2 will be blown when the varistor is damaged and reduced to a low value, so as to prevent unsafe factors such as fire.
The CLC filtering module 3 comprises an X capacitor C1, an X capacitor C2 and an inductor L, wherein one end of the X capacitor C1 is connected with a first output end of the gas discharging module 1, and the other end of the X capacitor C1 is connected with a second output end of the gas discharging module 1; one end of the inductor L is connected with one end of the X capacitor C2, the other end of the inductor L is connected with a first output end of the gas discharge module 1, and the other end of the X capacitor C2 is connected with a second output end of the body discharge module 1; the voltage at the two ends of the X capacitor C2 is output to the power switch circuit; the CLC filtering module not only has a filtering effect on the output voltage, but also has an averaging effect on the surge voltage.
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (7)
1. A surge protection circuit is characterized by comprising a gas discharge module (1), a piezoresistor module (2) and a CLC filter module (3) which are sequentially connected in parallel, wherein the gas discharge module (1) comprises a PCB (4) provided with a hollow window (5) and a wiring copper foil (6) arranged on the surface of the PCB, the wiring copper foil (6) is provided with a discharge tip (7), the discharge tip points to the hollow window (5), and the vertex is positioned on the edge of the hollow window (5); the gas discharge module (1) is provided with an input end and an output end, the input end is set as one end of each routing copper foil (6) in the length direction, the output end is set as the other end of each routing copper foil (6) in the length direction, the input end is connected with an AC input (9) respectively, and a first safety resistor F1 is arranged on a connecting branch.
2. A surge protection circuit according to claim 1, wherein said hollow window (5) contains air and/or inert gas.
3. The surge protection circuit according to claim 1, wherein the trace copper foils (6) are symmetrically disposed on two sides of the hollow window (5) along a length direction of the PCB (4), the trace copper foils (6) are disposed with a plurality of exposed copper foils (6-1) at intervals, and the discharge tips (7) are disposed on the exposed copper foils (6-1).
4. A surge protection circuit according to claim 1, wherein said varistor module (2) comprises a varistor VR, a second safety resistor F2 and a transient suppression diode TVS, one end of said varistor VR is connected to one end of said transient suppression diode TVS, the other end of said varistor VR is connected to one end of said second safety resistor F2, the other end of said transient suppression diode TVS is connected to a first output terminal of said gas discharge module (1), and the other end of said second safety resistor F2 is connected to a second output terminal of said gas discharge module (1).
5. A surge protection circuit according to claim 4, wherein said voltage dependent resistor is rated over a voltage range of 270-561V, and said transient suppression diode is rated over a voltage range of 20-100V.
6. The surge protection circuit according to claim 1, wherein the CLC filter module comprises an X capacitor C1, an X capacitor C2, and an inductor L, wherein one end of the X capacitor C1 is connected to the first output terminal of the gas discharge module (1), and the other end is connected to the second output terminal of the gas discharge module (1); one end of the inductor L is connected with one end of the X capacitor C2, the other end of the inductor L is connected with a first output end of the gas discharge module, and the other end of the X capacitor C2 is connected with a second output end of the gas discharge module (1).
7. A surge protection circuit according to claim 6, wherein the voltage across the X capacitor C2 is output to a switching power supply circuit (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121847660.5U CN217882847U (en) | 2021-08-09 | 2021-08-09 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121847660.5U CN217882847U (en) | 2021-08-09 | 2021-08-09 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217882847U true CN217882847U (en) | 2022-11-22 |
Family
ID=84049660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121847660.5U Active CN217882847U (en) | 2021-08-09 | 2021-08-09 | Surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217882847U (en) |
-
2021
- 2021-08-09 CN CN202121847660.5U patent/CN217882847U/en active Active
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