CN104244512A - Boost type LED drive short circuit overload projecting circuit - Google Patents
Boost type LED drive short circuit overload projecting circuit Download PDFInfo
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- CN104244512A CN104244512A CN201410378406.3A CN201410378406A CN104244512A CN 104244512 A CN104244512 A CN 104244512A CN 201410378406 A CN201410378406 A CN 201410378406A CN 104244512 A CN104244512 A CN 104244512A
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- circuit
- short circuit
- overload
- projecting
- type led
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- 238000001514 detection method Methods 0.000 claims description 3
- 239000011324 bead Substances 0.000 abstract description 3
- 238000005286 illumination Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
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Abstract
The invention relates to the field of electronic techniques, power sources and illumination, and provides a boost type LED drive short circuit overload projecting circuit. The boost type LED drive short circuit overload projecting circuit is mainly applied to short circuit and overload projecting in a boost constant current drive circuit in an LED lamp bead. On the basis of a BOOST circuit, few components are additionally arranged, and the short circuit overload problem of the circuit is solved.
Description
Technical field:
The application relates to electronic technology, power supply and lighting field, and the constant current being mainly used in LED lamp bead drives.
Technical background:
In recent years along with the continuous maturation of LED technology, LED is by extensively should in fields such as illumination, signal designations, and the feature of LED lamp bead determines its particular/special requirement to drive circuit.Booster type LED drive circuit is one wherein, and it is mainly from lower voltage, and drive by the mode of boosting the light fixture be in series by plurality of LEDs lamp pearl, this drive efficiency is high, is adapted to pass through battery powered drive circuit.And the weakness of this circuit be output voltage must higher than input voltage, otherwise voltage increase and current constant controls will lose efficacy, and power supply is directly filled with to load by inductance and diode, very easily causes circuit damage and load to damage.
Summary of the invention:
The object of the invention is the short circuit and the overload problem that solve booster circuit, the voltage increase and current constant being mainly used in LED drives.
On the basis of the booster circuit that content of the present invention is, increase a self-recoverage protection silk, current sense resistor is protected, the short circuit of common formation and overload protection loop simultaneously.
As shown in Figure 1, inductance L 1, diode D1, switching tube Q1, floating voltage feedback D2 and control circuit form a BOOST booster circuit to principle jointly.If do not have resettable fuse F1, when output short-circuit, power supply directly will get back to power supply ground by L1, D1, R2, and the most flimsy in this loop is resistance R2, and therefore big current is very fast burns out R2, causes whole circuit malfunction.The content of invention is in this loop, seal in a resettable fuse F1, protects detection resistance R2 simultaneously.The standard that resettable fuse is selected is that F1 can not action when constant current operation, when its maximum overload electric current super, and resettable fuse just action; Have two ways to the protected mode of R2, one is select powerful resistance, makes unlikely before the protection silk overload current maximum actuation time burning out, or by pass devices as diode pair resistance is protected.Like this, when output short-circuit or overload, because electric current is excessive, resettable fuse F1 temperature raises, and when reaching Curie temperature, fuse transits to high-impedance state, and electric current by rapid pinch off, thus produces protective effect to circuit.At overload current running time durations, the current ratio flowing through F1 is comparatively large, and the voltage now detecting resistance R2 two ends can raise, and after voltage increases to over the conducting voltage of diode, electric current mainly flows through from diode, thus has carried out available protecting to R2.And when normally working, the voltage at R2 two ends is lower than the conducting voltage of diode, and diode does not work, operating current is by detecting resistance and controller determines.
Accompanying drawing explanation
Fig. 1. short circuit overload protecting circuit schematic diagram
Embodiment
A kind of booster type LED drives short circuit overload protecting circuit, and it forms structure: on the basis of booster circuit, increases a self-recoverage protection silk, is protected by current sense resistor, the short circuit of common formation and overload protection loop simultaneously.
The present invention is on BOOST booster circuit basis, seals in a resettable fuse F1, protects detection resistance R2 simultaneously.The standard that resettable fuse is selected is that F1 can not action when constant current operation, when its maximum overload electric current super, and resettable fuse just action; Have two ways to the protected mode of R2, one is select powerful resistance, makes unlikely before the protection silk overload current maximum actuation time burning out, or by pass devices as diode pair resistance is protected.Like this, when output short-circuit or overload, because electric current is excessive, resettable fuse F1 temperature raises, and when reaching Curie temperature, fuse transits to high-impedance state, and electric current by rapid pinch off, thus produces protective effect to circuit.At overload current running time durations, the current ratio flowing through F1 is comparatively large, and the voltage now detecting resistance R2 two ends can raise, and after voltage increases to over the conducting voltage of diode, electric current mainly flows through from diode, thus has carried out available protecting to R2.And when normally working, the voltage at R2 two ends is lower than the conducting voltage of diode, and diode does not work, operating current is by detecting resistance and controller determines.
Claims (3)
1. the short circuit overload protecting circuit being applied to LED constant current and driving.It is characterized in that in output loop, seal in resettable fuse and current sense resistor.
2. be applied to the short circuit overload protecting circuit that LED constant current drives as claimed in claim 1, it is characterized in that: the protected mode of described current sense resistor, by selecting powerful detection resistance, meeting resettable fuse unlikely damage before action.
3. be applied to the short circuit overload protecting circuit that LED constant current drives as claimed in claim 1, it is characterized in that: described current sense resistor, can the mode of parallel diode with it realize.During normal work, the pressure drop detecting resistance can not make diode current flow, detects resistance drop and raise during overcurrent, protection diode current flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378406.3A CN104244512A (en) | 2014-07-28 | 2014-07-28 | Boost type LED drive short circuit overload projecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378406.3A CN104244512A (en) | 2014-07-28 | 2014-07-28 | Boost type LED drive short circuit overload projecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104244512A true CN104244512A (en) | 2014-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410378406.3A Pending CN104244512A (en) | 2014-07-28 | 2014-07-28 | Boost type LED drive short circuit overload projecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104244512A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429449A (en) * | 2018-05-04 | 2018-08-21 | 马少峰 | A kind of Boost power factor correctors of constant current output |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004425U (en) * | 2010-11-19 | 2011-10-05 | 四川九洲电器集团有限责任公司 | Protection circuit for realizing precise undervoltage-overvoltage and overcurrent |
| CN202126685U (en) * | 2011-05-17 | 2012-01-25 | 福建省万华电子科技有限公司 | Communication interface circuit for two-bus |
| CN202127526U (en) * | 2010-12-30 | 2012-01-25 | 何毅 | LED galvanostat circuit |
| CN102594170A (en) * | 2012-03-09 | 2012-07-18 | 广州金升阳科技有限公司 | Wide-input-voltage power supply converter |
| CN102841301A (en) * | 2012-09-27 | 2012-12-26 | 常州旭能新能源科技有限公司 | Photovoltaic assembly monitoring system |
-
2014
- 2014-07-28 CN CN201410378406.3A patent/CN104244512A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004425U (en) * | 2010-11-19 | 2011-10-05 | 四川九洲电器集团有限责任公司 | Protection circuit for realizing precise undervoltage-overvoltage and overcurrent |
| CN202127526U (en) * | 2010-12-30 | 2012-01-25 | 何毅 | LED galvanostat circuit |
| CN202126685U (en) * | 2011-05-17 | 2012-01-25 | 福建省万华电子科技有限公司 | Communication interface circuit for two-bus |
| CN102594170A (en) * | 2012-03-09 | 2012-07-18 | 广州金升阳科技有限公司 | Wide-input-voltage power supply converter |
| CN102841301A (en) * | 2012-09-27 | 2012-12-26 | 常州旭能新能源科技有限公司 | Photovoltaic assembly monitoring system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429449A (en) * | 2018-05-04 | 2018-08-21 | 马少峰 | A kind of Boost power factor correctors of constant current output |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160518 Address after: 239300, on the north side of Anhui city of Chuzhou province Tianchang eleven Road, East Road Applicant after: ANHUI LONG VOLT ENERGY CO., LTD. Address before: 413 building 200072, building 149, Shanghai Univer, Yanchang Road, Shanghai Applicant before: Li Yufeng |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141224 |