CN202231425U - Power protection circuit - Google Patents
Power protection circuit Download PDFInfo
- Publication number
- CN202231425U CN202231425U CN 201120395422 CN201120395422U CN202231425U CN 202231425 U CN202231425 U CN 202231425U CN 201120395422 CN201120395422 CN 201120395422 CN 201120395422 U CN201120395422 U CN 201120395422U CN 202231425 U CN202231425 U CN 202231425U
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- inductance
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- power supply
- power
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Abstract
The utility model discloses a power protection circuit which is characterized by comprising a power supply, inductors, a protective device and a load, wherein, the power supply, the inductors and the load are connected in series in the circuit; the protective device is bridged on two sides of the inductors; the load is connected in series between the inductors; and when transient high voltage occurs at a power interface and the voltage difference inducted by the two ends of an inductance coil excesses the threshold value voltage of the protective device, the protective device is conducted and consumes all the energy, thereby playing roles of releasing thunder and lightning transient current and restraining transient high voltage. Due to the adoption of the above structure, unsafe factors of a traditional way of adopting a housing to release current are eliminated, the safety of a backward-stage load is protected, and the safety of an electric system is improved; and besides, the power protection circuit with a simple structure is suitable for occasions requiring a higher insulating degree.
Description
Technical field
The utility model relates to a kind of circuit, relates in particular to a kind of power protecting circuit.
Background technology
In existing electronic system, to large-scale electronic system, all need power supply to supply it to run well from electronic devices and components, different electronic systems has certain requirement to power supply.When using external power supply, external power supply might be introduced high voltage transient and make the equipment permanent damages, therefore, needs corresponding protection circuit.At present general protective circuit be power input line and casing () between elements such as cross-over connection piezo-resistance or discharge tube, transient voltage suppresser spare TSV; When high voltage transient occurring in the circuit; Break-over of device such as piezo-resistance or discharge tube, transient voltage suppresser spare; To casing () energy of releasing, thereby protected the load of back level.But exist in this kind protective circuit to casing () leakage current, this point is conflicted with the requirement of dielectric voltage withstand mutually, has unsafe factor.The devices such as piezo-resistance of prior art protective circuit just can conducting at 630V (or other voltages); And device line and casing () between dielectric voltage withstand itself just can meet or exceed the threshold voltage of piezo-resistance; Reduce the safe class of equipment, brought unsafe hidden danger.
The utility model content
The utility model has proposed a kind of power lightning protection circuit to the deficiency of prior art, do not exist to casing () leakage current, the fail safe that has improved electronic system is applicable to that insulating requirements is than higher occasion.
The utility model is realized through following technical scheme:
The utility model discloses a kind of power protecting circuit, it is characterized in that, said protective circuit comprises: power supply, inductance, protection device and load; Wherein, Power supply, inductance, load are connected in the circuit, and the protection device is connected across the both sides of inductance, and load is connected between the inductance.
Further, said inductance comprises common mode inductance, and said protection device comprises piezo-resistance, and wherein, common mode inductance includes one group of input port, one group of output port, and input port is connected with power supply, and output port connects load; Piezo-resistance is connected across the both sides of same group of inductance coil of common mode inductance.
Further, the input port of said common mode inductance, an end connect any among the L, N line of positive pole or the AC power of DC power supply, and the other end connects other in negative pole or AC power L, the N line of DC power supply.
Further, said inductance comprises two common inductance, and said protection device comprises discharge tube; Wherein, two common inductance are connected with two poles, that is to say; One end of first inductance connects among the L, N line of positive pole or the AC power of DC power supply any one, and the other end connects load, and an end of second inductance connects among the L, N line of negative pole or the AC power of DC power supply other one; An other end connects load, and load is connected between first inductance, second inductance; Two discharge tubes are connected across first inductance and the second inductance both sides respectively.
Further, said discharge tube comprises two utmost point discharge tubes, three utmost point discharge tubes.
Further, said load comprises electronic devices and components, electronic equipment or electronic system.
Further, said protective circuit is a kind of power lightning protection circuit, plays the effect of release thunder and lightning transient current and high voltage transient suppression.
The technique effect of the utility model is that circuit structure design is simple, is applicable to the occasion that insulating requirements is high.When high voltage transient appears in the interface power supply; When the voltage difference that the inductance coil induction produces exceeds the threshold voltage of protecting device, the protection break-over of device, energy all consumes on device; Played the effect of release thunder and lightning transient current and high voltage transient suppression; Eliminated to casing () the unsafe factor that exists of leakage current pattern, protected the safety of back level load, the fail safe that has improved electronic system.
Description of drawings
According to accompanying drawing and embodiment the utility model is done further explain below.
Accompanying drawing 1 is prior art protective circuit figure;
Accompanying drawing 2 is for using the protective circuit figure of common mode inductance, piezo-resistance;
Accompanying drawing 3 is for using the protective circuit figure of common inductance, discharge tube.
Embodiment
Referring to accompanying drawing 1, Fig. 1 is prior art protective circuit figure, comprises power supply, two piezo-resistance R1, R2 in the circuit, discharge tube VP1 and load LOAD, wherein, piezo-resistance, protection devices such as discharge tube be connected on supply line and casing () between.When occurring high voltage transient in the supply line and be higher than the threshold voltage of protection devices such as piezo-resistance, discharge tube; These break-over of device; Through the casing the earth of releasing, this point is conflicted with the requirement of dielectric voltage withstand mutually, has unsafe factor with the energy of high voltage transient.
Referring to accompanying drawing 2, Fig. 2 is for using a specific embodiment of common mode inductance and piezo-resistance.Comprise power supply in this embodiment circuit, load LOAD, two piezo-resistance R1, R2, a common mode inductance L.
Common mode inductance L comprises one group of input port, one group of output port, and wherein, input port is connected with power supply, and output port connects load.The input port of common mode inductance, an end connect any among the L, N line of the anodal or AC power of DC power supply, and an other end connects other in negative pole or AC power L, the N line of DC power supply.
Piezo-resistance R1, R2 are connected across the both sides of same group of inductance coil of common mode inductance L respectively.Wherein, the maximum characteristics of piezo-resistance are to work as the voltage that is added in above it to be lower than its threshold values " U
N" time, the electric current that flows through it is minimum, is equivalent to one and closes dead valve, when voltage surpasses " U
N" time, the electric current that flows through it increases sharply, and is equivalent to valve open, utilizes this characteristic, can suppress the frequent abnormal overvoltage that occurs in the circuit, and protective circuit is avoided superpotential infringement.Piezo-resistance is mainly used in the transient overvoltage protection, under most application scenarios, can repeatedly recycle.
Load LOAD comprises electronic devices and components, electronic equipment or electronic system.
In the present embodiment, when high voltage transient appearred in power interface, the induction of inductance coil two ends produced voltage difference; When the voltage difference of inductance generation is lower than the threshold voltage of piezo-resistance; Piezo-resistance is a high-impedance state, and this moment, piezo-resistance was equivalent to open circuit, to the not influence of other circuit; When voltage difference is higher than the threshold voltage of piezo-resistance; Piezo-resistance is a low resistive state, and this moment, piezo-resistance will conducting, and energy all consumes on piezo-resistance; Played the effect of release thunder and lightning transient current and high voltage transient suppression; Eliminate the hidden danger that the mode that adopts the casing leakage current is brought, protected the safety of back level load, the fail safe that improved system.
Referring to accompanying drawing 3, Fig. 3 is for using another specific embodiment of common inductance and discharge tube.Comprise power supply in this embodiment circuit, load LOAD, two discharge tube VP1, VP2, two common inductance L1, L2.
Wherein, first inductance L 1 and second inductance L 2 are connected with two poles, that is to say; One end of first inductance L 1 connects among the L, N line of positive pole or the AC power of DC power supply any one; The other end connects load LOAD, and an end of second inductance L 2 connects among the L, N line of negative pole or the AC power of DC power supply other one, and an other end connects load LOAD; That is to say that load LOAD is series between first inductance and second inductance; Two discharge tube VP1, VP2 are connected across first inductance L 1, second inductance L, 2 both sides respectively.
Discharge tube VP1, VP2 are connected across the both sides of first inductance L 1, second inductance L 2 respectively.Discharge tube comprises two utmost point discharge tubes, three utmost point discharge tubes etc., and the voltage range that can bear is from tens to several kilovolts, and the discharge tube work principle is a gas discharge; Because the dielectric strength of gas is very big; So the discharge tube insulation resistance is very big, parasitic capacitance is very little, and the surge protective capacities is strong; Be usually used in the preceding two-stage in the multi-stage protection circuit, thunder and lightning transient current and over-voltage mainly play a part to release.
Load LOAD comprises electronic devices and components, electronic equipment or electronic system.
In the present embodiment, when high voltage transient appearred in power interface, voltage difference appearred in the induction of inductance two ends, and when the voltage difference that produces when the inductance two ends was lower than the threshold voltage of discharge tube, discharge tube was equivalent to open circuit, to the not influence of other circuit; When the inductance two ends produced voltage difference and exceed the threshold voltage of discharge tube, discharge tube will discharge breakdown, is converted into conduction state by original state of insulation; The voltage of discharge tube two interpolars maintains the residual voltage level that the arc road is determined after the conducting; Energy all consumes on discharge tube, has played the effect of release thunder and lightning transient current and high voltage transient suppression, has eliminated the casing hidden danger that the mode of energy brings of releasing; Protected the safety of back level load, the fail safe that has improved system.
Beneficial effect: adopt the disclosed power lightning protection circuit of the utility model, circuit structure is simple, is applicable to the occasion that insulating requirements is high.When high voltage transient appears in the interface power supply; When the voltage difference that the inductance coil induction produces exceeds the threshold voltage of protecting device, the protection break-over of device, energy all consumes on device; Played the effect of release thunder and lightning transient current and high voltage transient suppression; Eliminated the casing hidden danger that the mode of energy brings of releasing, protected the safety of back level load, the fail safe that has improved electronic system.
Above-mentioned preferred embodiment and the institute's application technology principle that is merely the utility model; Any technical staff who is familiar with the present technique field is in the technical scope that the utility model discloses; The variation that can expect easily or replacement all should be encompassed in the protection range of the utility model.
Claims (7)
1. a power protecting circuit is characterized in that, said protective circuit comprises: power supply, inductance, protection device and load, and wherein, power supply, inductance, load are connected in the circuit, and the protection device is connected across the both sides of inductance, and load is connected between the inductance.
2. protective circuit as claimed in claim 1 is characterized in that said inductance comprises common mode inductance; Said protection device comprises piezo-resistance, and wherein, common mode inductance includes one group of input port, one group of output port; Input port is connected with power supply, and output port connects load; Piezo-resistance is connected across the both sides of same group of inductance coil of common mode inductance.
3. protective circuit as claimed in claim 2; It is characterized in that; The input port of said common mode inductance, an end connect any among the L, N line of positive pole or the AC power of DC power supply, and the other end connects other in negative pole or AC power L, the N line of DC power supply.
4. protective circuit as claimed in claim 1 is characterized in that, said inductance comprises two common inductance; Said protection device comprises discharge tube, and wherein, two common inductance are connected with two poles; That is to say; One end of first inductance connects among the L, N line of positive pole or the AC power of DC power supply any one, and the other end connects load, and an end of second inductance connects among the L, N line of negative pole or the AC power of DC power supply other one; An other end connects load, and load is connected between first inductance, second inductance; Two discharge tubes are connected across first inductance and the second inductance both sides respectively.
5. protective circuit as claimed in claim 4 is characterized in that, said discharge tube comprises two utmost point discharge tubes, three utmost point discharge tubes.
6. protective circuit as claimed in claim 1 is characterized in that said load comprises electronic devices and components, electronic equipment or electronic system.
7. like the described protective circuit of one of claim 1～6, it is characterized in that said protective circuit is a kind of power lightning protection circuit, play the effect of release thunder and lightning transient current and high voltage transient suppression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120395422 CN202231425U (en) | 2011-10-17 | 2011-10-17 | Power protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120395422 CN202231425U (en) | 2011-10-17 | 2011-10-17 | Power protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231425U true CN202231425U (en) | 2012-05-23 |
Family
ID=46081999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120395422 Expired - Lifetime CN202231425U (en) | 2011-10-17 | 2011-10-17 | Power protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231425U (en) |
Cited By (2)
| 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 |
| CN114784777A (en) * | 2022-04-20 | 2022-07-22 | 国网江苏省电力有限公司电力科学研究院 | Configuration optimization method and system for high-voltage cable sheath protector |
-
2011
- 2011-10-17 CN CN 201120395422 patent/CN202231425U/en not_active Expired - Lifetime
Cited By (2)
| 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 |
| CN114784777A (en) * | 2022-04-20 | 2022-07-22 | 国网江苏省电力有限公司电力科学研究院 | Configuration optimization method and system for high-voltage cable sheath protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120523 |