CN204669660U - A kind of LED Drive Protecting Circuit - Google Patents
A kind of LED Drive Protecting Circuit Download PDFInfo
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- CN204669660U CN204669660U CN201520321760.2U CN201520321760U CN204669660U CN 204669660 U CN204669660 U CN 204669660U CN 201520321760 U CN201520321760 U CN 201520321760U CN 204669660 U CN204669660 U CN 204669660U
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Abstract
The utility model discloses a kind of LED Drive Protecting Circuit; comprise rectifier bridge Q, one-way SCR Q1, inductance L 1, resistance R1, diode D1 and triode Q2; described rectifier bridge Q pin 1 is connected the 220V alternating current other end respectively with rectifier bridge Q pin 3; rectifier bridge Q pin 2 connects inductance L 1, diode D1 negative pole, resistance R1 and load RL, rectifier bridge Q pin 4 respectively and connects the K pole of one-way SCR Q1, resistance R3, resistance R4 and diode D4 positive pole respectively and ground connection.The utility model LED Drive Protecting Circuit coordinates by using one-way SCR and voltage stabilizing didoe, and reach the automatic overvoltage to LED and under-voltage protection, circuit structure is simple, and volume is little, and cost is low, is applicable to very much promoting the use of.
Description
Technical field
The utility model relates to a kind of protective circuit, specifically a kind of LED Drive Protecting Circuit.
Background technology
Along with the development of electronic technology, the luminous efficiency of great power LED improves constantly, and present stage has has met or exceeded the luminous efficiency of electricity-saving lamp, and great power LED to have brightness high, color rendering is good, not easily generate heat, driving voltage is low, the distinguishing feature of overlong service life, LED semiconductor lighting has green, environmental protection, durable feature, becomes the first-selected illuminating device replacing conventional lights source.
LED is low-voltage, big current luminescent device, can not be connected directly between in AC network and use, and must have drive circuit, and due to LED be current mode device, constant current must be adopted to drive, otherwise easily burn LED.Due to conventional lights source such as screw socket, bayonet-type bulb and some shot-lights, volume own is just smaller, and LED illumination will replace these conventional lights sources, and just very high to the requirement of LED driver, need volume little, fail safe is high.
Utility model content
The purpose of this utility model is to provide a kind of LED Drive Protecting Circuit with overvoltage and under-voltage function, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of LED Drive Protecting Circuit, comprise rectifier bridge Q, one-way SCR Q1, inductance L 1, resistance R1, diode D1 and triode Q2, described rectifier bridge Q pin 1 is connected the 220V alternating current other end respectively with rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects inductance L 1 respectively, diode D1 negative pole, resistance R1 and load RL, rectifier bridge Q pin 4 connects the K pole of one-way SCR Q1 respectively, resistance R3, resistance R4 and diode D4 positive pole ground connection, the A pole of one-way SCR Q1 connects inductance L 1 other end and diode D1 positive pole respectively, the G pole of one-way SCR Q1 connects diode D2 positive pole and diode D3 negative pole respectively, diode D2 negative pole is the contact resistance R1 other end respectively, the resistance R3 other end and triode Q2 base stage, triode Q2 emitter connects LED and diode D4 negative pole respectively, triode Q2 collector electrode is the contact resistance R4 other end and diode D3 positive pole respectively.
As further program of the utility model: described diode D2 is voltage stabilizing didoe.
As further program of the utility model: described diode D4 is voltage stabilizing didoe.
As the utility model further scheme: described one-way SCR VS is TL431.
Compared with prior art, the beneficial effects of the utility model are: the utility model LED Drive Protecting Circuit coordinates by using one-way SCR and voltage stabilizing didoe, reaches the automatic overvoltage to LED and under-voltage protection; circuit structure is simple; volume is little, and cost is low, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of LED Drive Protecting Circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of LED Drive Protecting Circuit, comprise rectifier bridge Q, one-way SCR Q1, inductance L 1, resistance R1, diode D1 and triode Q2, rectifier bridge Q pin 1 is connected the 220V alternating current other end respectively with rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects inductance L 1 respectively, diode D1 negative pole, resistance R1 and load RL, rectifier bridge Q pin 4 connects the K pole of one-way SCR Q1 respectively, resistance R3, resistance R4 and diode D4 positive pole ground connection, the A pole of one-way SCR Q1 connects inductance L 1 other end and diode D1 positive pole respectively, the G pole of one-way SCR Q1 connects diode D2 positive pole and diode D3 negative pole respectively, diode D2 negative pole is the contact resistance R1 other end respectively, the resistance R3 other end and triode Q2 base stage, triode Q2 emitter connects LED and diode D4 negative pole respectively, triode Q2 collector electrode is the contact resistance R4 other end and diode D3 positive pole respectively.
Diode D2 is voltage stabilizing didoe.
Diode D4 is voltage stabilizing didoe.
One-way SCR VS is TL431.
Operation principle of the present utility model is: refer to Fig. 1, inductance L 1 and one-way SCR Q1 are composed in series trip circuit, the diode D1 being connected in parallel on inductance L 1 two ends improves the trigger voltage of one-way SCR Q1, the PN junction structure of diode D1 improves the energy triggered needed for trip circuit simultaneously, which improves electromagnetic immunity performance; Voltage stabilizing didoe D2 provides the reference voltage of under-voltage protection, protects triode Q2 simultaneously, prevents triode Q2 over-voltage breakdown; Resistance R1 and resistance R3, by rectified voltage dividing potential drop, when overtension, drives one-way SCR Q1 to realize protection of threading off by voltage stabilizing didoe D2; Resistance R1 and resistance R3 is by rectified voltage dividing potential drop, and when brownout, triode Q2 conducting, drives Q1 to realize protection of threading off by diode D3, thus the overvoltage reached LED and under-voltage protection function.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (4)
1. a LED Drive Protecting Circuit, comprise rectifier bridge Q, one-way SCR Q1, inductance L 1, resistance R1, diode D1 and triode Q2, it is characterized in that, described rectifier bridge Q pin 1 is connected the 220V alternating current other end respectively with rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects inductance L 1 respectively, diode D1 negative pole, resistance R1 and load RL, rectifier bridge Q pin 4 connects the K pole of one-way SCR Q1 respectively, resistance R3, resistance R4 and diode D4 positive pole ground connection, the A pole of one-way SCR Q1 connects inductance L 1 other end and diode D1 positive pole respectively, the G pole of one-way SCR Q1 connects diode D2 positive pole and diode D3 negative pole respectively, diode D2 negative pole is the contact resistance R1 other end respectively, the resistance R3 other end and triode Q2 base stage, triode Q2 emitter connects LED and diode D4 negative pole respectively, triode Q2 collector electrode is the contact resistance R4 other end and diode D3 positive pole respectively.
2. LED Drive Protecting Circuit according to claim 1, is characterized in that, described diode D2 is voltage stabilizing didoe.
3. LED Drive Protecting Circuit according to claim 1, is characterized in that, described diode D4 is voltage stabilizing didoe.
4. LED Drive Protecting Circuit according to claim 1, is characterized in that, described one-way SCR VS is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520321760.2U CN204669660U (en) | 2015-05-19 | 2015-05-19 | A kind of LED Drive Protecting Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520321760.2U CN204669660U (en) | 2015-05-19 | 2015-05-19 | A kind of LED Drive Protecting Circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204669660U true CN204669660U (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520321760.2U Expired - Fee Related CN204669660U (en) | 2015-05-19 | 2015-05-19 | A kind of LED Drive Protecting Circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204669660U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107343341A (en) * | 2017-08-07 | 2017-11-10 | 王陈伟 | A kind of emergency flight control system |
| CN108040399A (en) * | 2018-01-03 | 2018-05-15 | 欧普照明股份有限公司 | A kind of overvoltage crowbar and constant current driver circuit for LED |
-
2015
- 2015-05-19 CN CN201520321760.2U patent/CN204669660U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107343341A (en) * | 2017-08-07 | 2017-11-10 | 王陈伟 | A kind of emergency flight control system |
| CN108040399A (en) * | 2018-01-03 | 2018-05-15 | 欧普照明股份有限公司 | A kind of overvoltage crowbar and constant current driver circuit for LED |
| CN108040399B (en) * | 2018-01-03 | 2024-03-05 | 欧普照明股份有限公司 | Overvoltage protection circuit and LED constant current drive 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: 20150923 Termination date: 20180519 |