CN102355771A - LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit - Google Patents
LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit Download PDFInfo
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- CN102355771A CN102355771A CN2011102335256A CN201110233525A CN102355771A CN 102355771 A CN102355771 A CN 102355771A CN 2011102335256 A CN2011102335256 A CN 2011102335256A CN 201110233525 A CN201110233525 A CN 201110233525A CN 102355771 A CN102355771 A CN 102355771A
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Abstract
The invention discloses an LED (Light-emitting Diode) circuit capable of effectively controlling an overcurrent value in the circuit, which comprises an insurance resistor, a voltage reduction capacitor, a bleeder resistor, bridge rectifiers, a filter capacitor, an LED and an alternating current input end, wherein the alternating current input end is respectively connected with the resistors, the voltage reduction capacitor and a first bridge rectifier; the voltage reduction capacitor is connected with the bleeder resistor in parallel; the first bridge rectifier is connected with the LED in series, and the LED is connected with the filter capacitor in parallel; and the LED is connected with a collector electrode of a first triode, an emitting electrode of the first triode is connected with a detection resistor, a base electrode of the first triode is respectively connected with a first resistor and a second resistor, the second resistor is connected with a collector electrode of a second triode, a transmitting electrode of the second triode is connected with the detection resistor, and a base electrode of the second triode is connected with the transmitting electrode of the first triode. The LED circuit disclosed by the invention can ensure that no overcurrent is caused in the LED circuit, has prolonged service life and less energy consumption, and can play a role of current limit when current and voltage are too high or have interference.
Description
Technical field
The present invention relates to cross in a kind of effectively control circuit the led circuit of flow valuve.
Background technology
Present led circuit comprises insurance resistance, decompression capacitor, bleeder resistance, bridge rectifier, filter capacitor, light-emitting diode and alternating current input; Wherein the alternating current input respectively with the insurance resistance, decompression capacitor links to each other with first bridge rectifier; Decompression capacitor is parallelly connected with bleeder resistance; First bridge rectifier is connected with light-emitting diode, and light-emitting diode is parallelly connected with filter capacitor again; In whole loop, be in series with a current-limiting resistance, come to cross flow valuve in the control circuit, but such mode make entire circuit no matter when,, reduced in its life-span all in consumed power.
Summary of the invention
The object of the present invention is to provide in a kind of effectively control circuit the led circuit of crossing flow valuve, the present invention has can guarantee not overcurrent of LED loop, prolongs its useful life, and power consumption is few, too high or when interference is arranged at current/voltage, can play the purpose of threshold currents.
In order to reach above-mentioned purpose, solution of the present invention is:
Cross the led circuit of flow valuve in a kind of effectively control circuit, comprise insurance resistance, decompression capacitor, bleeder resistance, bridge rectifier, filter capacitor, light-emitting diode and alternating current input; Wherein the alternating current input respectively with the insurance resistance, decompression capacitor links to each other with first bridge rectifier; Decompression capacitor is parallelly connected with bleeder resistance; First bridge rectifier is connected with light-emitting diode, and light-emitting diode is parallelly connected with filter capacitor again; The utmost point electrode of described light-emitting diode and first triode with link to each other; The emitter of first triode links to each other with detection resistance; The base stage of first triode links to each other with second resistance with first resistance respectively; Second resistance links to each other with the utmost point electrode of second triode; The emitter of second triode links to each other with detection resistance, and the base stage of second triode links to each other with the emitter of first triode.
Beneficial effect of the present invention is: the present invention has can guarantee not overcurrent of LED loop, prolongs its useful life, and power consumption is few, too high or when interference is arranged at current/voltage, can play the purpose of threshold currents.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Embodiment 1
Cross the led circuit of flow valuve in a kind of effectively control circuit of present embodiment, comprise insurance resistance R 1, decompression capacitor C1, bleeder resistance R2, bridge rectifier BR1, filter capacitor C2, LED and alternating current input AC; Wherein alternating current input AC respectively with the insurance resistance R 1, decompression capacitor C1 links to each other with the first bridge rectifier BR1; Decompression capacitor C1 is parallelly connected with bleeder resistance R2; The first bridge rectifier BR1 connects with LED, and LED is parallelly connected with filter capacitor C2 again; The utmost point electrode of described LED and the first triode G1 with link to each other; The emitter of the first triode G1 links to each other with detection resistance R 3; The base stage of the first triode G1 links to each other with second resistance R 5 with first resistance R 4 respectively; Second resistance R 5 links to each other with the utmost point electrode of the second triode G2; The emitter of the second triode G2 links to each other with detection resistance R 3, and the base stage of the second triode G2 links to each other with the emitter of the first triode G1.Most preferably scheme is to select operating current and the work compression resistance of the first triode G1 all greater than the second triode G2; Because the operating current of the second triode G2 and work compression resistance are more than or equal to the waste that all seems of the operating current of the first triode G1 and work compression resistance; Increasing cost, is unnecessary.Detecting resistance R 3 is the resistance that can set resistance value, and the conducting voltage that present embodiment is set the second triode G2 is 0.6V, and the current limit value that flows through LED is no more than 50mA; So the voltage that detects resistance R 3 two ends usually just equals the conducting voltage of the second triode G2, just confirm according to flowing through voltage that detects resistance R 3 two ends and the electric current that flows through LED so detect resistance R 3.
Whole loop is when the energising beginning, because detect the conducting voltage of resistance R 3 voltages＜second triode G2, the second triode G2 is in not conducting state, and the first triode G1 is because the reason of first resistance R 4 is in conducting state; When electric current raises suddenly; Through detecting the voltage >=0.6V of resistance R 3; When just being in overcurrent; The voltage that detects resistance R 3 is through the 3rd resistance R 6; Make the second triode G2 begin conducting, and, make the triode G1 that wins become half conducting state gradually through the voltage that second resistance R 5 reduces on the first triode G1 base stage; Conducting resistance through the first triode G1 is increased, and electric current reduces; Voltage up to detecting resistance R 3 begins to drop to 0.6V and following, and the second triode G2 also begins to be tending towards closed condition from half conducting state, plays the purpose of overcurrent protection, is specially adapted to the unsettled situation of power supply such as anti-thunderbolt and surge.The 3rd resistance R 6 plays protection second triode G2 and the effect that improves accuracy of detection, makes the electric current of the second triode G2 controlled, makes it can overcurrent, and the current limitation precision through the led circuit of present embodiment is improved.The present invention has can guarantee not overcurrent of LED loop, prolongs its useful life, and power consumption is few, too high or when interference is arranged at current/voltage, can play the purpose of threshold currents.
Claims (2)
1. a led circuit of effectively crossing flow valuve in the control circuit comprises insurance resistance (R1), decompression capacitor (C1), bleeder resistance (R2), bridge rectifier (BR1), filter capacitor (C2), light-emitting diode (LED) and alternating current input (AC); Wherein alternating current input (AC) respectively with the insurance resistance (R1), decompression capacitor (C1) links to each other with first bridge rectifier (BR1); Decompression capacitor (C1) is parallelly connected with bleeder resistance (R2); First bridge rectifier (BR1) is connected with light-emitting diode (LED), and light-emitting diode (LED) is parallelly connected with filter capacitor (C2) again; It is characterized in that: the utmost point electrode of described light-emitting diode (LED) and first triode (G1) with link to each other; The emitter of first triode (G1) links to each other with detection resistance (R3); The base stage of first triode (G1) links to each other with second resistance (R5) with first resistance (R4) respectively; Second resistance (R5) links to each other with the utmost point electrode of second triode (G2); The emitter of second triode (G2) links to each other with detection resistance (R3), and the base stage of second triode (G2) links to each other with the emitter of first triode (G1).
2. cross the led circuit of flow valuve in a kind of effectively control circuit as claimed in claim 1, it is characterized in that: also be in series with the 3rd resistance (R6) between the emitter of the base stage of described second triode (G2) and first triode (G1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102335256A CN102355771A (en) | 2011-08-16 | 2011-08-16 | LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102335256A CN102355771A (en) | 2011-08-16 | 2011-08-16 | LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit |
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| Publication Number | Publication Date |
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| CN102355771A true CN102355771A (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102335256A Pending CN102355771A (en) | 2011-08-16 | 2011-08-16 | LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013131240A1 (en) * | 2012-03-06 | 2013-09-12 | 上海嘉塘电子有限公司 | Led lamp capable of regulating dimming |
| TWI636704B (en) * | 2012-10-19 | 2018-09-21 | 晶元光電股份有限公司 | Light-emitting device circuit and method of operating thereof |
| CN108934110A (en) * | 2018-08-20 | 2018-12-04 | 浙江凯耀照明股份有限公司 | Adjusting control circuit and its control method under LED light low-light level |
| US10412801B1 (en) | 2018-08-23 | 2019-09-10 | Epistar Corporation | Light-emitting device |
| CN111683437A (en) * | 2020-08-12 | 2020-09-18 | 成都极米科技股份有限公司 | LED drive circuit and projector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076213A (en) * | 2006-05-18 | 2007-11-21 | 河南科技学院 | LED illuminating light and its controlling circuit |
| CN101702858A (en) * | 2009-12-05 | 2010-05-05 | 刘大银 | LED power supply |
| KR20110033702A (en) * | 2009-09-25 | 2011-03-31 | 서울반도체 주식회사 | Driving circuit for light emmiting devices |
| CN202178903U (en) * | 2011-08-16 | 2012-03-28 | 吴广毅 | LED (light-emitting diode) circuit capable of effectively controlling overcurrent value in circuit |
-
2011
- 2011-08-16 CN CN2011102335256A patent/CN102355771A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076213A (en) * | 2006-05-18 | 2007-11-21 | 河南科技学院 | LED illuminating light and its controlling circuit |
| KR20110033702A (en) * | 2009-09-25 | 2011-03-31 | 서울반도체 주식회사 | Driving circuit for light emmiting devices |
| CN101702858A (en) * | 2009-12-05 | 2010-05-05 | 刘大银 | LED power supply |
| CN202178903U (en) * | 2011-08-16 | 2012-03-28 | 吴广毅 | LED (light-emitting diode) circuit capable of effectively controlling overcurrent value in circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013131240A1 (en) * | 2012-03-06 | 2013-09-12 | 上海嘉塘电子有限公司 | Led lamp capable of regulating dimming |
| TWI636704B (en) * | 2012-10-19 | 2018-09-21 | 晶元光電股份有限公司 | Light-emitting device circuit and method of operating thereof |
| CN108934110A (en) * | 2018-08-20 | 2018-12-04 | 浙江凯耀照明股份有限公司 | Adjusting control circuit and its control method under LED light low-light level |
| CN108934110B (en) * | 2018-08-20 | 2020-01-31 | 浙江凯耀照明股份有限公司 | Dimming control circuit and method for LED lamp at low brightness |
| US10412801B1 (en) | 2018-08-23 | 2019-09-10 | Epistar Corporation | Light-emitting device |
| CN111683437A (en) * | 2020-08-12 | 2020-09-18 | 成都极米科技股份有限公司 | LED drive circuit and projector |
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Application publication date: 20120215 |