CN205249043U - Soft start circuit of communication power supply - Google Patents
Soft start circuit of communication power supply Download PDFInfo
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- CN205249043U CN205249043U CN201521046423.3U CN201521046423U CN205249043U CN 205249043 U CN205249043 U CN 205249043U CN 201521046423 U CN201521046423 U CN 201521046423U CN 205249043 U CN205249043 U CN 205249043U
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- resistance
- triode
- power supply
- bulb
- terminal regulator
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Abstract
The utility model discloses a soft start circuit of communication power supply, including resistance R1, electric capacity C1, triode VT1, three terminal regulator U1 and bulb D1, three terminal regulator U1 input and power VCC are connected respectively to electric capacity C1 one end, the three terminal regulator U1 earthing terminal is connecting resistance R1 respectively, resistance R2, triode VT1 projecting pole and resistance R3, the three terminal regulator U1 output is connected respectively to the resistance R2 other end, resistance R4 and output vo, the resistance R4 other end is the connecting resistance R3 other end respectively, triode VT1 base and bulb D1 one end, electric capacity C2 is connected to the bulb D1 other end, triode VT1 collecting electrode is connected respectively to the electric capacity C2 other end, the resistance R1 other end and the electric capacity C1 other end and ground connection. The utility model discloses soft start circuit of communication power supply adopts triode and capacity cell, prevents effectively that heavy current that the circular telegram probably caused in the twinkling of an eye from to the harm of output load, adding the pilot lamp function simultaneously, and is directly perceived showing of operating condition of circuit, safe convenient.
Description
Technical field
The utility model relates to a kind of start-up circuit, specifically a kind of soft starting circuit of communication power supply.
Background technology
In the various past with now in conventional power supply, in design, mostly there is an intrinsic shortcoming: will draw powering up momentGet a larger electric current, this electric current may reach 10～100 times of power supply static working current, has thus possibility at leastProduce the problem of two aspects, the first, if current and power supply can not be supplied with enough starting currents, power supply may enter oneLock-out state and cannot starting, the second, this electric current may cause the reduction of input supply voltage, be enough to cause use sameOther power-equipment instant power-downs of input power; And the general electronic equipment using of communication field is all comparatively accurate, its power supplyThe design of power supply is particularly important.
Utility model content
The purpose of this utility model is to provide a kind of soft starting circuit of communication power supply, proposes to solve in above-mentioned background technologyProblem.
For achieving the above object, the utility model provides following technical scheme:
A soft starting circuit for communication power supply, comprise resistance R 1, capacitor C 1, triode VT1, three terminal regulator U1 andBulb D1, described capacitor C 1 one end connects respectively three terminal regulator U1 input and power supply VCC, and three terminal regulator U1 connectsGround end contact resistance R1, resistance R 2, triode VT1 emitter stage and resistance R 3 respectively, resistance R 2 other ends connect respectively threeEnd voltage-stablizer U1 output, resistance R 4 and output end vo, resistance R 4 other ends are the contact resistance R3 other end, three utmost points respectivelyPipe VT1 base stage and bulb D1 one end, the bulb D1 other end connects capacitor C 2, capacitor C 2 other ends connecting triode respectivelyVT1 colelctor electrode, resistance R 1 other end and capacitor C 1 other end ground connection.
As further scheme of the utility model: described three terminal regulator U1 adopts 7809.
Compared with prior art, the beneficial effects of the utility model are: the soft starting circuit of the utility model communication power supply, adoptWith triode and capacity cell, the harm of the moment that effectively prevents from the switching on large electric current that may cause to output load adds simultaneouslyEnter functions of indicator light, the duty of circuit intuitively manifests, safe ready.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of soft starting circuit of communication power supply.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clearlyChu, intactly description, obviously, described embodiment is only the utility model part embodiment, instead of wholeEmbodiment. Based on the embodiment in the utility model, those of ordinary skill in the art are not making under creative work prerequisiteThe every other embodiment obtaining, belongs to the scope that the utility model is protected.
Refer to Fig. 1, in the utility model embodiment, a kind of soft starting circuit of communication power supply, comprises resistance R 1, electric capacityC1, triode VT1, three terminal regulator U1 and bulb D1, it is defeated that described capacitor C 1 one end connects respectively three terminal regulator U1Enter end and power supply VCC, three terminal regulator U1 earth terminal distinguish contact resistance R1, resistance R 2, triode VT1 emitter stage andResistance R 3, resistance R 2 other ends connect respectively three terminal regulator U1 output, resistance R 4 and output end vo, resistance R 4The other end is the contact resistance R3 other end, triode VT1 base stage and bulb D1 one end respectively, and the bulb D1 other end connects electricityHold C2, capacitor C 2 other ends connecting triode VT1 colelctor electrode, resistance R 1 other end and capacitor C 1 other end connect respectivelyGround; Described three terminal regulator U1 adopts 7809.
Operation principle of the present utility model is: refer to Fig. 1, switching on power VCC moment, the voltage in capacitor C 2 can notSudden change, triode VT1 by R2 and R3 biasing and saturation conduction so just makes R1 short circuit, is equivalent to the adjustment termination of U1Ground, along with 2 charging intervals of capacitor C lengthen, output end vo voltage rises gradually, until reach specified output voltage; ElectricityThe effect of resistance R4 is after power cutoff, to make the upper electric charge of C2 discharge very soon the normal soft start that ensures start next time, and bulb D1 usesIn the duty of indicating circuit.
To those skilled in the art, obviously the utility model is not limited to the details of above-mentioned example embodiment, Er QieDo not deviate from the situation of spirit of the present utility model or essential characteristic, can realize the utility model with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, this practicality is newThe scope of type is limited by claims instead of above-mentioned explanation, is therefore intended to be equal to containing of important document by what drop on claimAll changes in justice and scope are included in the utility model. Any Reference numeral in claim should be considered as to restrictionRelated claim.
In addition although should be appreciated that this description is described according to embodiment, be not that each embodiment only comprises,A technical scheme independently, this narrating mode of description is only for clarity sake, those skilled in the art should be byDescription is done as a whole, and the technical scheme in each embodiment also can be through appropriately combined, and forming those skilled in the art canWith other embodiments of understanding.
Claims (2)
1. a soft starting circuit for communication power supply, comprises resistance R 1, capacitor C 1, triode VT1, three terminal regulator U1With bulb D1, it is characterized in that, described capacitor C 1 one end connects respectively three terminal regulator U1 input and power supply VCC, threeEnd voltage-stablizer U1 earth terminal contact resistance R1, resistance R 2, triode VT1 emitter stage and resistance R 3 respectively, resistance R 2 is anotherOne end connects respectively three terminal regulator U1 output, resistance R 4 and output end vo, resistance R 4 other ends contact resistance respectivelyThe R3 other end, triode VT1 base stage and bulb D1 one end, the bulb D1 other end connects capacitor C 2, capacitor C 2 other endsConnecting triode VT1 colelctor electrode, resistance R 1 other end and capacitor C 1 other end ground connection respectively.
2. the soft starting circuit of a kind of communication power supply according to claim 1, is characterized in that, described three terminal regulatorU1 adopts 7809.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521046423.3U CN205249043U (en) | 2015-12-15 | 2015-12-15 | Soft start circuit of communication power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521046423.3U CN205249043U (en) | 2015-12-15 | 2015-12-15 | Soft start circuit of communication power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205249043U true CN205249043U (en) | 2016-05-18 |
Family
ID=55948112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521046423.3U Expired - Fee Related CN205249043U (en) | 2015-12-15 | 2015-12-15 | Soft start circuit of communication power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205249043U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356963A (en) * | 2016-11-04 | 2017-01-25 | 易事特集团股份有限公司 | Soft boot circuit |
-
2015
- 2015-12-15 CN CN201521046423.3U patent/CN205249043U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356963A (en) * | 2016-11-04 | 2017-01-25 | 易事特集团股份有限公司 | Soft boot circuit |
| CN106356963B (en) * | 2016-11-04 | 2019-04-02 | 易事特集团股份有限公司 | Soft starting circuit |
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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: 20160518 Termination date: 20161215 |