CN206498194U - Surging protection circuit - Google Patents
Surging protection circuit Download PDFInfo
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- CN206498194U CN206498194U CN201621469712.9U CN201621469712U CN206498194U CN 206498194 U CN206498194 U CN 206498194U CN 201621469712 U CN201621469712 U CN 201621469712U CN 206498194 U CN206498194 U CN 206498194U
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Abstract
The utility model discloses a kind of surging protection circuit, it is related to the emergency protection circuit device for electric technical field without cutting off circuit for over-voltage.The surging protection circuit includes surge restraint circuit and partial pressure match circuit, the surge restraint circuit includes clamper type surge protective device and switching mode surge protective device, one end of the clamper type surge protective device is a terminals of the protection circuit, the other end of the clamper type surge protective device is connected with one end of the switching mode surge protective device, the other end of the switching mode surge protective device is another terminals of the protection circuit, the partial pressure match circuit includes partial pressure build-out resistor R1 and R2, the resistance R1 is connected in parallel with the clamper type surge protective device, the resistance R2 is connected in parallel with the switching mode surge protective device.The circuit reduces residual voltage during complete machine surge impact, and the environmental adaptability of circuit has been effectively ensured, so as to optimize complete machine cost.
Description
Technical field
The utility model is related to the emergency protection circuit device for electric technical field without cutting off circuit for over-voltage, especially
It is related to a kind of good surging protection circuit of protection effect.
Background technology
At present, the electronic product power source importation of high reliability, is generally done using clamper type and the series connection of switching mode product
Carrying out surge protection；In actual product design process, because the mode of operation of clamper type and switching mode protection device, electric parameter and
Characteristic（For example：Breakdown voltage, response time, static impedance, motional impedance etc.）Differ greatly, such as clamper type and switching mode are protected
The voltage of device is directly connected, protection device unbalanced-voltage-division weighing apparatus, it may appear that protection device malfunction in machine product normal work
Make, acceleration protection device aging has a strong impact on the performance and reliability of machine product normal work, therefore cause clamper type and open
The product voltage of pass type protection device can not directly connect selection；To improve machine product reliability, existing traditional scheme is set
Meter, usually clamper type and switching mode protect the breakdown voltage of product to meet power input requirement, the string of the traditional scheme respectively
Connection breakdown voltage is generally higher than more than twice of input voltage, it is impossible to the residual voltage under surge impact is effectively ensured, makes rear class
Circuit bears pressure greatly, and layout layout difficulty is big and complete machine cost is high.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of surging protection circuit, and the circuit, which has, to be improved
While whole aircraft reliability energy, residual voltage during complete machine surge impact is reduced, the environmental adaptability of circuit has been effectively ensured, from
And optimize complete machine cost, it can be widely applied to the power input portion of electronic product.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of surging protection circuit, it is described
Surging protection circuit is connected in parallel on by the power input of protection circuit, it is characterised in that：Including surge restraint circuit and partial pressure
With circuit, the surge restraint circuit includes clamper type surge protective device and switching mode surge protective device, the clamper type
One end of surge protective device be the protection circuit a terminals, the other end of the clamper type surge protective device with
One end connection of the switching mode surge protective device, the other end of the switching mode surge protective device is the protection circuit
Another terminals, the partial pressure match circuit includes partial pressure build-out resistor R1 and R2, the resistance R1 and the clamper type
Surge protective device is connected in parallel, and the resistance R2 is connected in parallel with the switching mode surge protective device；The protection circuit
The voltage at each resistance two ends is fixed using resistance R1 and resistance R2 voltage divider principle, so as to grips pincers bit-type protection device and open
The voltage at pass type protection device two ends.
It is preferred that, the clamper type surge protective device is piezo-resistance MOV or Transient Suppression Diode TVS.
It is preferred that, the switching mode surge protective device is ceramic gas discharge tube GDT, glass gas/potent discharge tube
SPG or semiconductor discharge tube TSS.
It is using the beneficial effect produced by above-mentioned technical proposal：The circuit by setting partial pressure match circuit,
While improving whole aircraft reliability energy, residual voltage during complete machine surge impact is reduced, the environmental suitability of circuit has been effectively ensured
Can, so as to optimize complete machine cost, it can be widely applied to the power input portion of electronic product.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the overall circuit schematic diagram of circuit described in the utility model embodiment；
Fig. 2 is the carrying out surge protection scheme schematic diagram of complete machine insulated supply system or dc source in the prior art；
Fig. 3 is surging protection circuit schematic diagram described in the utility model embodiment one；
Fig. 4 is complete machine insulated supply system shown in Fig. 2 or the traditional carrying out surge protection scheme residual voltage figure of dc source；
Fig. 5 is the residual voltage figure of surging protection circuit described in the utility model embodiment one；
Fig. 6 is the traditional carrying out surge protection scheme schematic diagram of complete machine earthing power supply；
Fig. 7 is surging protection circuit schematic diagram described in the utility model embodiment two；
Fig. 8 is the residual voltage figure of carrying out surge protection scheme traditional shown in Fig. 6；
Fig. 9 is the residual voltage figure of surging protection circuit described in the utility model embodiment two；
Figure 10 is that machine shell is grounded the traditional carrying out surge protection scheme schematic diagram for having the power supply of resistance to pressure request；
Figure 11 is the surging protection circuit schematic diagram described in the utility model embodiment three；
Figure 12 is the residual voltage figure of carrying out surge protection scheme traditional described in Figure 10；
Figure 13 is the residual voltage figure of the utility model embodiment three；
Wherein：1st, clamper type surge protective device 2, switching mode surge protective device.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be different from other manner described here using other implement, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore the utility model is not limited by following public specific embodiment.
Overall, as shown in figure 1, the utility model discloses a kind of surging protection circuit, the surging protection circuit is simultaneously
It is associated in by the power input of protection circuit, the protection circuit includes surge restraint circuit and partial pressure match circuit.The wave
Gushing suppression circuit includes clamper type surge protective device 1 and switching mode surge protective device 2, the clamper type surge protective device
1 one end is a terminals of the protection circuit, the other end and the switching mode of the clamper type surge protective device 1
One end connection of surge protective device 2, the other end of the switching mode surge protective device 2 is another of the protection circuit
Terminals.The partial pressure match circuit includes partial pressure build-out resistor R1 and R2, the resistance R1 and the clamper type carrying out surge protection
Device 1 is connected in parallel, and the resistance R2 is connected in parallel with the switching mode surge protective device 2；The protection circuit utilizes electricity
Resistance R1 and resistance R2 voltage divider principle fixes the voltage at each resistance two ends, so that grips pincers bit-type protection device and switching mode are protected
Protect the voltage at device two ends.
The protection circuit overcomes different working modes protection device unbalanced-voltage-division by setting partial pressure match circuit
Weighing apparatus, voltage, which can not directly connect, causes residual voltage after circuit surge impact high, the problem of complete machine scheme cost is high；The protection simultaneously
Circuit clearly distributes the partial pressure problem of switching mode protection device under normal circumstances and clamper type protection device, to improve HI-POT
The unfailing performance of each protection device during test.
To sum up, the protection circuit reduces the residual voltage during complete machine surge impact while whole aircraft reliability energy is improved,
The environmental adaptability of circuit has been effectively ensured, so as to optimize complete machine cost, the power input of electronic product has been can be widely applied to
Part.
Embodiment one
Complete machine insulated supply system or the contrast of DC power supply surge protectiving scheme：(program is at the same time as second level surge
Protection reduction residual voltage)
Traditional carrying out surge protection scheme is illustrated in figure 2, is made the difference using piezo-resistance and touches carrying out surge protection；
The surging protection circuit described in the utility model embodiment one is illustrated in figure 3 by peripheral circuit resistance ratio,
Made the difference by the way of piezo-resistance TSS and semiconductor discharge tube MOV are connected and touch surging protection circuit；Protected shown in Fig. 3
Circuit utilizes the resistance ratio of partial pressure match circuit, the voltage at fixed allocation protection device two ends, in circuit normal work
In the case of, it is 2/3 times of power input voltage Vin, semiconductor discharge tube MOV both end voltages to make piezo-resistance TSS both end voltages
For 1/3 times of power input voltage Vin, so that fixed protection device both end voltage, can also pass through resistance in partial pressure match circuit
Resistance ratio do the corresponding adjustment of protection device, improve circuit reliability.
Fig. 4 and Fig. 5 are respectively residual voltage pair of the two schemes under 8/20us＆1.2/50us composite waves, 1.5KV surge impacts
The situation of ratio.Contrasted from accompanying drawing 4, the residual voltage of accompanying drawing 5, under identical surge impact, a kind of high performance carrying out surge protection scheme ratio
Traditional carrying out surge protection scheme residual voltage is lower.
Embodiment two
Complete machine earthing power supply carrying out surge protection scheme comparison：
Such as Fig. 6：Traditional carrying out surge protection scheme is made the difference using piezo-resistance touches protection, using piezo-resistance and gas discharge
Common mode protection is done in pipe series connection, because piezo-resistance and discharge tube dynamic parameter differ greatly, therefore piezo-resistance and gas-discharge tube point
Voltage model is not selected according to input power Vin；
The surging protection circuit described in the utility model embodiment two is illustrated in figure 7, using partial pressure match circuit, according to
The resistance ratio of resistance fixes piezo-resistance MOV and ceramic gas discharge tube GDT both end voltages；As designed resistors match in Fig. 3,
In the case of normal power supply, piezo-resistance MOV both end voltages are 2/3 times of input power Vin, ceramic gas discharge tube GDT two ends
Voltage be 1/3 times of input power, protection device voltage can be achieved and directly connects protection；
Fig. 8, Fig. 9 are residual voltage contrast situation of the two schemes under 8/20us＆1.2/50us composite waves, 4KV surge impacts；
Contrasted from Fig. 8, Fig. 9 residual voltage, under identical surge impact, a kind of high performance carrying out surge protection scheme is more anti-than traditional surge
The voltage rejection ability of shield scheme is stronger；
Case study on implementation three
Machine shell ground connection has the power supply product of resistance to pressure request carrying out surge protection scheme comparison
As shown in Figure 10 be traditional carrying out surge protection scheme, made the difference using piezo-resistance and touch protection, using piezo-resistance with
Common mode protection is done in discharge tube series connection, due to there is the resistance to pressure requests of HI-pot, therefore requires that discharge tube product breakdown voltage need to be more than
1500Vac；
It is as shown in figure 11 the surging protection circuit described in the utility model embodiment three, utilizes the resistance of partial pressure match circuit
Anti- distribution, the voltage at fixed protection device two ends；As above in figure scheme, under normal 220Vac electric power thus supplieds, piezo-resistance MOV two
Terminal voltage is 2/5 times of power input vin, and ceramic gas discharge tube GDT both end voltages are 3/5 times of power input；Doing
During 1500Vac hi-pot, piezo-resistance MOV both end voltages are 1/4 times that 1500VAC is inputted, and discharge tube both end voltage is
3/4 times of 1500VAC inputs；For different HI-POT grades, Reasonable adjustment protector can be distributed according to peripheral circuit resistance
Part model, to meet actual use demand, improves machine product reliability；
Figure 10 and Figure 11 scheme can meet HI-POT 1500vac, 1min, 5mA tests；Figure 12 and Figure 13 are respectively
Two schemes contrast situation under 8/20us＆1.2/50us composite waves, 4KV surge impacts；
From Figure 10 and Figure 11, two schemes can meet HI-POT 1500vac, and 1min, 5mA is tested, and by Figure 12
Contrast and understand under identical surge impact with Figure 13 two schemes, a kind of high performance carrying out surge protection scheme is more anti-than traditional surge
The operation voltage of shield scheme is lower.
It should be noted that in specific embodiment, can according to actual use situation and the tolerance of late-class circuit,
R1/R2 resistance ratio is adjusted, the service behaviour of circuitry is effectively ensured in the model of corresponding adjustment protection device.
Claims (3)
1. a kind of surging protection circuit, the surging protection circuit is connected in parallel on by the power input of protection circuit, its feature exists
In：Including surge restraint circuit and partial pressure match circuit, the surge restraint circuit includes clamper type surge protective device（1）With
Switching mode surge protective device（2）, the clamper type surge protective device（1）One end be the protection circuit a wiring
End, the clamper type surge protective device（1）The other end and the switching mode surge protective device（2）One end connection, institute
State switching mode surge protective device（2）The other end be the protection circuit another terminals, the partial pressure match circuit
Including partial pressure build-out resistor R1 and R2, the resistance R1 and the clamper type surge protective device（1）It is connected in parallel, the resistance
R2 and the switching mode surge protective device（2）It is connected in parallel；The protection circuit is former using resistance R1 and resistance R2 partial pressure
Reason fixes the voltage at each resistance two ends, so that the voltage at grips pincers bit-type protection device and switching mode protection device two ends.
2. surging protection circuit as claimed in claim 1, it is characterised in that：The clamper type surge protective device is pressure-sensitive electricity
Hinder MOV or Transient Suppression Diode TVS.
3. surging protection circuit as claimed in claim 1, it is characterised in that：The switching mode surge protective device is ceramic gas
Body discharge tube GDT, glass gas/potent discharge tube SPG or semiconductor discharge tube TSS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621469712.9U CN206498194U (en) | 2016-12-30 | 2016-12-30 | Surging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621469712.9U CN206498194U (en) | 2016-12-30 | 2016-12-30 | Surging protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206498194U true CN206498194U (en) | 2017-09-15 |
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| CN201621469712.9U Active CN206498194U (en) | 2016-12-30 | 2016-12-30 | Surging protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655138A (en) * | 2016-12-30 | 2017-05-10 | 广东百圳君耀电子有限公司 | Surge protection circuit |
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2016
- 2016-12-30 CN CN201621469712.9U patent/CN206498194U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655138A (en) * | 2016-12-30 | 2017-05-10 | 广东百圳君耀电子有限公司 | Surge protection circuit |
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