CN204578080U - A kind of surge protection circuit - Google Patents
A kind of surge protection circuit Download PDFInfo
- Publication number
- CN204578080U CN204578080U CN201520161404.9U CN201520161404U CN204578080U CN 204578080 U CN204578080 U CN 204578080U CN 201520161404 U CN201520161404 U CN 201520161404U CN 204578080 U CN204578080 U CN 204578080U
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- discharge tube
- protection circuit
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- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000001052 transient effect Effects 0.000 claims description 18
- 230000001629 suppression Effects 0.000 claims description 15
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000001419 dependent effect Effects 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000002633 protecting effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A kind of surge protection circuit, comprising: a common mode inductance, be arranged on two inlet highways, two winding is series in an inlet highway respectively; A switching mode protection device, with a winding parallel in described common mode inductance two windings; A votage limit type protection device, before being arranged on common mode inductance, in parallel with between two inlet highways; And two Y capacitance, after being arranged on common mode inductance, one end is arranged on each described inlet highway, its public termination protecting field.Realize, to the differential mode of surge and common mode full guard, there is the advantage that volume is little, structure is simple, cost is low, reliability is strong by simple components and parts common mode inductance in conjunction with switching mode protection device, votage limit type protection device and Y capacitance in the utility model.
Description
Technical Field
The utility model belongs to the technical field of power supply unit, especially, relate to a surge protection circuit.
Background
In actual life, a switching power supply is often tested by lightning surge, and the electronic equipment is greatly damaged or even damaged by transient of over-high voltage or over-high surge current.
At present, surge protection of the switching power supply mainly passes through some lightning protection devices, the lightning protection devices are large in occupied area and not easy to place, and in addition, the internal structure of the lightning protection devices is complex and the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a surge protection circuit to solve the problem that the protection equipment structure among the prior art is complicated.
A surge protection circuit comprising: the common-mode inductor is arranged on the two input buses, and two windings of the common-mode inductor are respectively connected in series in one input bus; a switch-type protection device connected in parallel with one of the two windings of the common-mode inductor; the voltage limiting type protection device is arranged in front of the common mode inductor and connected in parallel with the two input buses; and two Y capacitors arranged behind the common-mode inductor, one end of each Y capacitor is arranged on each input bus, and the common end of each Y capacitor is connected with a protective ground.
Preferably, the voltage-limiting protection device can be a voltage-clamping transient suppression diode or a piezoresistor; or, the voltage-limiting protection circuit takes a voltage-clamping transient suppression diode and a voltage dependent resistor as main devices.
Preferably, the voltage-limiting protection circuit using the voltage-clamping transient suppression diode and the voltage dependent resistor as main devices specifically includes: the voltage clamping type transient suppression diode or the piezoresistor and the gas discharge tube are mutually connected in series; or, the voltage clamping type transient suppression diode or the piezoresistor and the protective tube are connected in series.
Preferably, the switching type protector may be a gas discharge tube or a TSS semiconductor discharge tube; alternatively, a switching type protection circuit having a gas discharge tube or a TSS semiconductor discharge tube as a main component is used.
Preferably, the switch-type protection circuit with the gas discharge tube or the TSS semiconductor discharge tube as a main device specifically includes: and the gas discharge tube or the TSS semiconductor discharge tube and the piezoresistor are connected in series.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the circuit is simple and the reliability is high;
2. the cost is low;
3. the practicability is strong.
Drawings
Fig. 1 shows a schematic structural diagram of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include logical, logical order, and other changes. The examples merely typify possible variations. Individual steps and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims, and is not intended to automatically limit the scope of this application to any single utility model or utility model concept if more than one utility model is in fact disclosed.
As shown in fig. 1, there is disclosed a surge protection circuit including: the common mode inductor 6 is arranged on the first input bus 2 and the second input bus 3, and two windings of the common mode inductor are respectively connected in series in one input bus; a switching protection device 5 connected in parallel with one of the two windings of the common mode inductor 6; a voltage-limiting protection device 4 arranged in front of the common-mode inductor 6 and connected in parallel between the two input buses 2 and 3; and a Y capacitor 7 which is arranged behind the common-mode inductor 6 and on each input bus, and the common end of the Y capacitor is connected with a protective ground;
wherein, an input circuit 1, such as an input switch, a fuse, other filter circuits, etc., is also arranged in front of the two input buses; the post-stage circuit 8 of the surge protection circuit is a load device or a load-related circuit.
Additionally, the two input buses may be adapted for use as live and neutral.
1) When the outgoing line between the input buses has higher surge voltage, the voltage is applied to two ends of a voltage-limiting protection device of the input port, the voltage-limiting protection device is a voltage sensitive device, and the voltage is clamped at a relatively fixed voltage value at the moment, so that the protection of a rear-stage circuit is realized.
2) When surge voltage appearing between the input bus and the protected ground is low, the common mode inductor plays a role in blocking current mutation to play a role in inhibiting, the Y capacitor plays a role in further discharging, and the effect of protecting a rear-stage circuit is achieved; when the lightning surge voltage between the input bus and the protected ground is higher, the switch-type protection device is conducted due to the fact that the switch-type protection device bears the overhigh voltage, the conducted voltage is lower, and the effect of protecting a rear-stage circuit is achieved.
In some illustrative embodiments, the voltage limiting protection device may be a voltage clamping transient suppression diode, a voltage dependent resistor, or a voltage limiting protection circuit having a voltage clamping transient suppression diode or a voltage dependent resistor as a main device.
The voltage-limiting protection circuit with the voltage-clamping transient suppression diode or the piezoresistor as a main device comprises but is not limited to the voltage-clamping transient suppression diode/piezoresistor and the gas discharge tube which are connected in series; or, the voltage clamping type transient suppression diode/voltage dependent resistor and the protective tube are connected in series.
Wherein, the fuse tube can adopt a fuse.
Preferably, the voltage-limiting protection device is a voltage-clamping transient suppression diode or a piezoresistor, and when an overvoltage occurs between two electrodes of the voltage-clamping transient suppression diode or the piezoresistor, the voltage can be clamped to a relatively fixed voltage value, so that the protection of a rear-stage circuit is realized.
In some illustrative embodiments, the switching type protection device may be a gas discharge tube or a TSS semiconductor discharge tube; alternatively, a switching type protection circuit having a gas discharge tube or a TSS semiconductor discharge tube as a main component is used.
The switch-type protection circuit with the gas discharge tube or the TSS semiconductor discharge tube as a main device comprises, but is not limited to, the gas discharge tube or the TSS semiconductor discharge tube and the piezoresistor which are connected in series.
Preferably, the switch-type protection device is a gas discharge tube, and the working principle is gas discharge. When the voltage between the two electrodes is large enough, the gap between the electrodes breaks down the discharge, and the original insulation state is converted into a conductive state, which is similar to a short circuit. The voltage maintained between the two poles of the switch type protection device is very low, generally 20-50V, under the conducting state, so that the effect of protecting a rear-stage circuit can be achieved.
The switch type protection device and the voltage limiting type protection device in the application can be replaced by similar functional devices.
The utility model discloses in combine switch type protection device, voltage limiting type protection device and Y electric capacity to realize the differential mode and the common mode total protection to the surge through simple components and parts common mode inductance, have small, simple structure, with low costs, advantage that the good reliability. The circuit shown in fig. 1 was subjected to practical test tests and satisfied the requirements of GB/T17626.5-2008.
Any modifications, equivalent substitutions, improvements and the like made to the processes described in the embodiments of the present invention within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (5)
1. A surge protection circuit, comprising: the common-mode inductor is arranged on the two input buses, and two windings of the common-mode inductor are respectively connected in series in one input bus; a switch-type protection device connected in parallel with one of the two windings of the common-mode inductor; the voltage limiting type protection device is arranged in front of the common mode inductor and connected in parallel with the two input buses; and two Y capacitors arranged behind the common-mode inductor, one end of each Y capacitor is arranged on each input bus, and the common end of each Y capacitor is connected with a protective ground.
2. The surge protection circuit according to claim 1, wherein the voltage-limiting protection device is a voltage-clamping transient suppressor diode, a voltage dependent resistor or a voltage-limiting protection circuit using a voltage-clamping transient suppressor diode and a voltage dependent resistor as main devices.
3. The surge protection circuit according to claim 2, wherein the voltage-limiting protection circuit with the voltage-clamping transient suppression diode and the voltage dependent resistor as main devices specifically comprises:
the voltage clamping type transient suppression diode or the piezoresistor and the gas discharge tube are mutually connected in series; or,
and the voltage clamping type transient suppression diode or the piezoresistor and the protective tube are mutually connected in series.
4. The surge protection circuit of claim 1, wherein the switching protection device is a gas discharge tube or a TSS semiconductor discharge tube; alternatively, a switching type protection circuit having a gas discharge tube or a TSS semiconductor discharge tube as a main component is used.
5. The surge protection circuit according to claim 4, wherein the switching protection circuit having a gas discharge tube or a TSS semiconductor discharge tube as a main component comprises:
and the gas discharge tube or the TSS semiconductor discharge tube and the piezoresistor are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520161404.9U CN204578080U (en) | 2015-03-20 | 2015-03-20 | A kind of surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520161404.9U CN204578080U (en) | 2015-03-20 | 2015-03-20 | A kind of surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204578080U true CN204578080U (en) | 2015-08-19 |
Family
ID=53870675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520161404.9U Expired - Fee Related CN204578080U (en) | 2015-03-20 | 2015-03-20 | A kind of surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204578080U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631282A (en) * | 2018-07-10 | 2018-10-09 | 横店集团得邦照明股份有限公司 | A kind of lightning protection circuit and its implementation for LED illumination lamp |
| CN110635464A (en) * | 2019-10-16 | 2019-12-31 | 李吉晓 | Common-mode lightning protection circuit of LED lighting lamp |
| CN116683415A (en) * | 2022-02-23 | 2023-09-01 | 比亚迪股份有限公司 | Vehicle-mounted charging system and vehicle |
| CN117553571A (en) * | 2024-01-11 | 2024-02-13 | 宝鸡宝钛装备科技有限公司 | High-temperature alloy smelting waveform acquisition device |
-
2015
- 2015-03-20 CN CN201520161404.9U patent/CN204578080U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631282A (en) * | 2018-07-10 | 2018-10-09 | 横店集团得邦照明股份有限公司 | A kind of lightning protection circuit and its implementation for LED illumination lamp |
| CN110635464A (en) * | 2019-10-16 | 2019-12-31 | 李吉晓 | Common-mode lightning protection circuit of LED lighting lamp |
| CN116683415A (en) * | 2022-02-23 | 2023-09-01 | 比亚迪股份有限公司 | Vehicle-mounted charging system and vehicle |
| CN117553571A (en) * | 2024-01-11 | 2024-02-13 | 宝鸡宝钛装备科技有限公司 | High-temperature alloy smelting waveform acquisition device |
| CN117553571B (en) * | 2024-01-11 | 2024-04-02 | 宝鸡宝钛装备科技有限公司 | High-temperature alloy smelting waveform acquisition device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20180320 |