CN203151808U - LED driving circuit capable of preventing over current - Google Patents
LED driving circuit capable of preventing over current Download PDFInfo
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- CN203151808U CN203151808U CN 201320029428 CN201320029428U CN203151808U CN 203151808 U CN203151808 U CN 203151808U CN 201320029428 CN201320029428 CN 201320029428 CN 201320029428 U CN201320029428 U CN 201320029428U CN 203151808 U CN203151808 U CN 203151808U
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Abstract
The utility model is an LED driving circuit capable of preventing over current. The LED driving circuit comprises alternating current input ends, an LED circuit unit, a resistance-capacitance step-down circuit unit, a rectifying circuit unit and a filtering circuit unit, wherein the resistance-capacitance step-down circuit unit, the rectifying circuit unit and the filtering circuit unit are sequentially connected in series. The LED driving circuit is characterized by further comprising a safety circuit unit and a current-limiting circuit unit, wherein the safety circuit unit is arranged between one alternating current input end and the resistance-capacitance step-down circuit unit in a series connection mode, and the current-limiting circuit unit is arranged between the LED circuit unit and the filtering circuit unit in a series connection mode. Due to the arrangement of the safety circuit unit and the current-limiting circuit unit, an LED circuit is ensured not to be subject to over current, the LED circuit has a longer service life and consumes less power, and current can be limited when current voltage is too high or interference exists. The LED driving circuit of the utility model is simple in structure, low in cost, small in size and high in reliability; the stability and the reliability of LED products can be improved; and the comprehensive service life of LED products can be prolonged.
Description
Technical field
The utility model relates to light-emitting diode (LED) circuit, particularly a kind of LED power driving circuit.
Background technology
Existing LED power driving circuit is to adopt LED resistance-capacitance depressurization circuit, mainly comprise decompression capacitor, bleeder resistance, bridge rectifier, filter capacitor, light-emitting diode, wherein the alternating current input is connected with bridge rectifier with decompression capacitor, decompression capacitor is in parallel with bleeder resistance, bridge rectifier is connected with LED, LED is in parallel with filter capacitor again, in whole loop, be in series with a current-limiting resistance, but such LED resistance-capacitance depressurization circuit structure makes entire circuit no matter when all in consumed power, its life-span is reduced, and too high or when interference is arranged at current/voltage, can't play effective metering function.
Summary of the invention
But the purpose of this utility model provides a kind of led drive circuit of anti-overflow, effectively cross flow valuve in the control circuit to guarantee not overcurrent of LED loop, thereby prolong its useful life and reduce power consumption, simultaneously can be at current/voltage too high or have when interference that electric current is limited.
In order to reach above-mentioned purpose, the utility model is by the following technical solutions: but make up a kind of led drive circuit of anti-overflow, the resistance-capacitance depressurization circuit unit, rectification circuit unit, the filter circuit unit that comprise alternating current input, led circuit unit and series connection successively, be characterized in, also comprise an insurance circuit unit and a current-limiting circuit unit, described insurance circuit unit is arranged between alternating current input and the resistance-capacitance depressurization unit with series system, and described current-limiting circuit unit is arranged between led circuit unit and the filter circuit with series system.
According to the led drive circuit of an embodiment of the utility model, described insurance circuit unit comprises an insurance resistance or a protective tube; Described resistance-capacitance depressurization circuit unit comprises at least one electric capacity and resistance in parallel; Described rectification circuit unit comprises a bridge rectifier; Described filter circuit unit comprises at least one electric capacity; Described current-limiting circuit unit is made up of following circuit with the led circuit unit: described LED is connected with the collector electrode of first triode, the emitter of first triode is connected with detection resistance, the base stage of first triode is connected with second resistance with first resistance respectively, second resistance is connected with the collector electrode of second triode, and the emitter of second triode is connected with detection resistance.
Preferably, described bridge rectifier is a bridge rectifier of being made up of four diodes.
Preferably, described filter circuit unit comprises a filter capacitor and one and filter capacitor parallel resistor.
Preferably, optimization of working parameters wherein becomes: the operating current of first triode and work compression resistance are all greater than operating current and the work compression resistance of second triode; It is 0.06V that the resistance value of detection resistance is set the conducting voltage that makes second triode for, and the current limit value that flows through light-emitting diode is no more than 30mA.
The beneficial effects of the utility model are: owing to be provided with insurance circuit unit and current-limiting circuit unit, can guarantee not overcurrent of LED loop, prolong its useful life, power consumption is few, and is too high or when interference is arranged at current/voltage, can limit electric current; Led drive circuit of the present utility model is simple in structure, with low cost, volume is little, reliability is high, can especially in small power LED illumination, replace the constant current switch power driving circuit at the LED product, reach effectively and reduce cost, improve stability and the reliability of LED product, prolong the comprehensive useful life of LED product; Therefore, the road of popularizing and promoting a convenient feasible technology open of the utility model LED lighting technology.
Description of drawings
But Fig. 1 is the structural representation of the led drive circuit of anti-overflow of the present utility model.
But Fig. 2 is the led drive circuit schematic diagram of anti-overflow of the present utility model shown in Figure 1.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.At first need to prove, the utility model is not limited to following embodiment, those skilled in the art should understand the utility model from the spirit that following execution mode embodies, and each technical term can be done the most wide in range understanding based on spiritual essence of the present utility model.Same or analogous member uses the same reference numerals to represent among the figure.
But Fig. 1 is the structural representation of light-emitting diode (hereinafter to be referred as the LED) drive circuit of anti-overflow of the present utility model.As shown in Figure 1, but the led drive circuit of anti-overflow of the present utility model comprises alternating current input 9, insurance circuit unit 1, resistance-capacitance depressurization circuit unit 2, rectification circuit unit 3, filter circuit unit 4, current-limiting circuit unit 5 and the led circuit unit 6 of connecting successively.
Below in conjunction with accompanying drawing and a specific embodiment principle of the present utility model and design feature are described further.
But Fig. 2 is the led drive circuit schematic diagram of anti-overflow of the present utility model shown in Figure 1, as a specific embodiment, as shown in the figure, but the led drive circuit of the anti-overflow of present embodiment, be the led drive circuit of crossing flow valuve in a kind of effectively control circuit, comprise alternating current input 9, insurance circuit unit 1, resistance-capacitance depressurization circuit unit 2, rectification circuit unit 3, filter circuit unit 4, current-limiting circuit unit 5 and the led circuit unit 6 of series connection successively; Wherein insurance circuit unit 1 comprises an insurance resistance or a protective tube R1; Described resistance-capacitance depressurization circuit unit 2 comprises at least one of parallel connection, for example is respectively a decompression capacitor C1 and bleeder resistance R2 in the present embodiment; Described rectification circuit unit 3 comprises a bridge rectifier (BR) device 10, arranges the bridge rectifier that forms by common bridge-type by four diode D1-D4; Filtered electrical of described filter circuit unit 4 bags is the connecting circuit of at least two electric capacity perhaps, comprises a filter capacitor C2 and a resistance R 3 in parallel in the present embodiment; Described current-limiting circuit unit 5 is made up of following circuit with led circuit unit 6: described LED is connected with the collector electrode of first a triode Q1, the emitter of the first triode Q1 is connected with detection resistance R 7, the base stage of the first triode Q1 is connected with second resistance R 5 with first resistance R 4 respectively, second resistance R 5 is connected with the collector electrode of the second triode Q2, and the emitter of the second triode Q2 is connected with detection resistance R 7 with resistance R 3.
Specifically, shown in Fig. 2 is detailed, wherein alternating current input 9 respectively with the insurance resistance R 1, decompression capacitor C1 is connected with the diode D1 ~ D4 of first bridge rectifier 10, decompression capacitor C1 and bleeder resistance R2 are connected in parallel, the output of the D1 ~ D4 of bridge rectifier 10 and resistance R 3 are connected in parallel with filter capacitor C2, receive anode 6 ' and the negative terminal 6 of led circuit unit 6 then by current-limiting circuit unit 5 "; the emitter of the first triode Q1 is connected with detection resistance R 7; base stage of the first triode Q1 is connected with second resistance R 5 with first resistance R 4 respectively; second resistance R 5 is connected with the collector electrode of the second triode Q2; the emitter of the second triode Q2 is connected with detection resistance R 7 with resistance R 3, and the base stage of the second triode Q2 links to each other with the emitter of the first triode Q1 by resistance R 6.Wherein optimization of working parameters becomes: the operating current of the first triode Q1 and work compression resistance are all greater than operating current and the work compression resistance of the second triode Q2, because the operating current of the second triode Q2 and work compression resistance are more than or equal to the waste that all seems of the operating current of the first triode Q1 and work compression resistance, increasing cost, is unnecessary; Detecting resistance R 7 is the resistance that can set resistance value, and the conducting voltage that present embodiment is set the second triode Q2 is 0.06V, and the current limit value that flows through light-emitting diode is no more than 30mA; So the voltage that detects resistance R 7 two ends usually just equals the conducting voltage of the second triode Q2, just determine according to flowing through the voltage that detects resistance R 7 two ends and the electric current that flows through light-emitting diode so detect resistance R 7.
The led drive circuit course of work of above-mentioned anti-overflow of the present utility model is as follows: whole loop is when the energising beginning, because detect the conducting voltage of resistance R 7 voltages＜second triode Q2, the second triode Q2 is in not conducting state, the first triode Q1 is because the reason of first resistance R 4, be in conducting state: when electric current raises suddenly, through detecting the voltage 〉=0.06V of resistance R 7, when just being in overcurrent, detect the voltage of resistance R 7 by the 3rd resistance R 6, make the second triode Q2 begin conducting, and by the voltage on second resistance R, 5 reductions, the first triode Q1 base stage, make the triode Q1 that wins become half conducting state gradually, conducting resistance through the first triode Q1 is increased, and electric current reduces; Begin to drop to 0.6V and following up to the voltage that detects resistance R 7, the second triode Q2 also begins to be tending towards closed condition from half conducting state, reaches the purpose of overcurrent protection, is specially adapted to the unsettled situations of power supply such as anti-thunderbolt and surge.The effect that the 3rd resistance R 6 plays the protection second triode Q2 and improves accuracy of detection makes the electric current of the second triode Q2 controlled, makes it can overcurrent, and the current limitation precision through the led circuit of present embodiment is improved.
In sum, led drive circuit of the present utility model can guarantee not overcurrent of LED loop, prolongs its useful life, and power consumption is few, and is too high or when interference is arranged at current/voltage, can limit electric current.Effectively solve the technical barrier that resistance-capacitance depressurization driving LED circuit causes the LED overcurrent easily by the insurance in the led drive circuit, current-limiting circuit control unit.
Should be understood that those skilled in the art can make various changes or modifications the utility model after having read above-mentioned instruction content of the present utility model, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (5)
1. but the led drive circuit of an anti-overflow, the resistance-capacitance depressurization circuit unit, rectification circuit unit, the filter circuit unit that comprise alternating current input, led circuit unit and series connection successively, it is characterized in that, also comprise an insurance circuit unit and a current-limiting circuit unit, described insurance circuit unit is arranged between alternating current input and the resistance-capacitance depressurization unit with series system, and described current-limiting circuit unit is arranged between led circuit unit and the filter circuit with series system.
2. but the led drive circuit of anti-overflow according to claim 1 is characterized in that, described insurance circuit unit comprises an insurance resistance or a protective tube; Described resistance-capacitance depressurization circuit unit comprises at least one electric capacity and resistance in parallel; Described rectification circuit unit comprises a bridge rectifier; Described filter circuit unit comprises at least one electric capacity; Described current-limiting circuit unit is made up of following circuit with the led circuit unit: described LED is connected with the collector electrode of first triode, the emitter of first triode is connected with detection resistance, the base stage of first triode is connected with second resistance with first resistance respectively, second resistance is connected with the collector electrode of second triode, and the emitter of second triode is connected with detection resistance.
3. but the led drive circuit of anti-overflow according to claim 2 is characterized in that, described bridge rectifier is a bridge rectifier of being made up of four diodes.
4. but the led drive circuit of anti-overflow according to claim 2 is characterized in that, described filter circuit unit comprises a filter capacitor and one and filter capacitor parallel resistor.
5. but the led drive circuit of anti-overflow according to claim 2 is characterized in that, wherein optimization of working parameters becomes: the operating current of first triode and work compression resistance are all greater than operating current and the work compression resistance of second triode; It is 0.06V that the resistance value of detection resistance is set the conducting voltage that makes second triode for, and the current limit value that flows through light-emitting diode is no more than 30mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320029428 CN203151808U (en) | 2013-01-21 | 2013-01-21 | LED driving circuit capable of preventing over current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320029428 CN203151808U (en) | 2013-01-21 | 2013-01-21 | LED driving circuit capable of preventing over current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203151808U true CN203151808U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320029428 Expired - Fee Related CN203151808U (en) | 2013-01-21 | 2013-01-21 | LED driving circuit capable of preventing over current |
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| CN (1) | CN203151808U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610135A (en) * | 2016-03-30 | 2016-05-25 | 天津瑞能电气有限公司 | Protection device applied to power system control power supply |
| CN107396494A (en) * | 2017-07-21 | 2017-11-24 | 佛山杰致信息科技有限公司 | LED stabilized driving circuits |
-
2013
- 2013-01-21 CN CN 201320029428 patent/CN203151808U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610135A (en) * | 2016-03-30 | 2016-05-25 | 天津瑞能电气有限公司 | Protection device applied to power system control power supply |
| CN107396494A (en) * | 2017-07-21 | 2017-11-24 | 佛山杰致信息科技有限公司 | LED stabilized driving circuits |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170122 Address after: 201201 Shanghai, Pudong New Area East Road, No. 9, building 1, building 6101 Patentee after: Ayura Terua Limited by Share Ltd Address before: 201201 Shanghai East Road, Pudong New Area, building B, building No. 2, building No. 6101 Patentee before: Shanghai Oppel Lighting Co., Ltd. Patentee before: Shanxi Haoyu Photoelectric Science & Technology Co., Ltd. Patentee before: Shanghai Wellmax Lighting Industry Co., Ltd. |
|
| 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: 20130821 Termination date: 20200121 |