CN103281843A - Current controllable type LED circuit - Google Patents
Current controllable type LED circuit Download PDFInfo
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- CN103281843A CN103281843A CN2013102335039A CN201310233503A CN103281843A CN 103281843 A CN103281843 A CN 103281843A CN 2013102335039 A CN2013102335039 A CN 2013102335039A CN 201310233503 A CN201310233503 A CN 201310233503A CN 103281843 A CN103281843 A CN 103281843A
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- operational amplifier
- led lamp
- resistance
- pmos pipe
- output
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Abstract
The invention discloses a current controllable type LED circuit. The current controllable type LED circuit comprises a control circuit, a PMOS pipe Q and an LED lamp D, wherein the positive electrode of the LED lamp D is connected with a power source, the negative electrode of the LED lamp D is connected with a source electrode of the PMOS pipe Q, a drain electrode of the PMOS pipe Q is connected to the ground through a resistor R3, the control circuit comprises an operational amplifier M1 and an operational amplifier M2, the positive electrode input of the operational amplifier M1 is connected to a reference voltage, the negative electrode input of the operational amplifier M1 is connected with the ground through an adjustable resistor R1 and a resistor R2, the output of the operational amplifier M1 is connected with the negative electrode input of the operational amplifier M1 through the adjustable resistor R1, the output of the operational amplifier M1 is further connected to the positive electrode input of the operational amplifier M2, the negative electrode input of the operational amplifier M2 is connected to the ground through the resistor R3, and the output of the operational amplifier M2 is connected to a grid electrode of the PMOS pipe Q. The current controllable type LED circuit has the advantages that the current controllable type LED circuit can adjust currents on an LED lamp, the current of the LED lamp is adjusted to be a rated current when the LED lamp is used, and therefore the service life of the LED lamp is prolonged.
Description
Technical field
The present invention relates to a kind of control circuit, particularly relate to a kind of controlled current formula led circuit.
Background technology
The LED lamp is a kind of semiconductor that electric energy can be converted into visible light, and it has changed the luminous principle luminous with the electricity-saving lamp tricolor powder of incandescent lamp tungsten filament, and adopts electroluminescence [/color].According to one's analysis, the characteristics of LED are very obvious, and the life-span is long, light efficiency is high, radiationless and low-power consumption.The spectrum of LED almost all concentrates on visible light frequency band, and its luminous efficiency can reach 80～90%.But existing LED lamp in use, because electric current does not reach its rated current, causes significantly reduce the useful life of LED lamp.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of controlled current formula led circuit is provided, overcome existing LED lamp in use because operating current does not reach rated current, thereby cause the defective of life-span minimizing.
Purpose of the present invention is achieved through the following technical solutions: controlled current formula led circuit, comprise control circuit, PMOS pipe Q and LED lamp D, the positive pole of described LED lamp D connects power supply, negative pole is connected to the source electrode of PMOS pipe Q, the drain electrode of PMOS pipe Q is through resistance R 3 ground connection, described control circuit comprises operational amplifier M1 and operational amplifier M2, the positive pole input of operational amplifier M1 is connected to a reference voltage, the negative pole input is successively by adjustable resistance R1, resistance R 2 ground connection, its output is connected to the negative pole input through adjustable resistance R1, the output of operational amplifier M1 is also connected in the positive pole input of operational amplifier M2, the negative pole input of operational amplifier M2 is by resistance R 3 ground connection, and its output is connected to the grid of PMOS pipe Q.In this patent, by regulating the resistance of adjustable resistance R1, change the ratio between adjustable resistance R1, the resistance R 2, make the different voltage of the output of operational amplifier M1 to operational amplifier M2, thereby change the electric current on the resistance R 3, reach the electric current on the control LED lamp D, as long as can guarantee that the electric current on the LED lamp D is the rated current of LED lamp D, increased the life-span of LDE lamp.
Further, above-mentioned resistance R 2 also is adjustable resistance, the adjusting that the electric current on the resistance R 3 can be convenient.
Further, be provided with a protective resistance R4 between the grid of described PMOS pipe Q and the source electrode, for the protection of PMOS pipe Q.
The invention has the beneficial effects as follows: this device can be regulated the electric current on the LED lamp, when using like this LED lamp current is adjusted to rated current, thereby has increased the life-span of LED lamp.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
The present invention is described in further detail below in conjunction with embodiment, but structure of the present invention is not limited only to following examples:
[embodiment 1]
As shown in Figure 1, controlled current formula led circuit, comprise control circuit, PMOS pipe Q and LED lamp D, the positive pole of described LED lamp D connects power supply, negative pole is connected to the source electrode of PMOS pipe Q, the drain electrode of PMOS pipe Q is through resistance R 3 ground connection, described control circuit comprises operational amplifier M1 and operational amplifier M2, the positive pole input of operational amplifier M1 is connected to a reference voltage, the negative pole input is successively by adjustable resistance R1, resistance R 2 ground connection, its output is connected to the negative pole input through adjustable resistance R1, the output of operational amplifier M1 is also connected in the positive pole input of operational amplifier M2, the negative pole input of operational amplifier M2 is by resistance R 3 ground connection, and its output is connected to the grid of PMOS pipe Q.In this patent, by regulating the resistance of adjustable resistance R1, change the ratio between adjustable resistance R1, the resistance R 2, make the different voltage of the output of operational amplifier M1 to operational amplifier M2, thereby change the electric current on the resistance R 3, reach the electric current on the control LED lamp D, as long as can guarantee that the electric current on the LED lamp D is the rated current of LED lamp D, increased the life-span of LDE lamp.
[embodiment 2]
Fig. 2, present embodiment are on the basis of embodiment 1, and resistance R 2 also is adjustable resistance, the adjusting that the electric current on the resistance R 3 can be convenient.
Be provided with a protective resistance R4 between the grid of PMOS pipe Q and the source electrode, for the protection of PMOS pipe Q.
Claims (3)
1. controlled current formula led circuit, it is characterized in that, comprise control circuit, PMOS pipe Q and LED lamp D, the positive pole of described LED lamp D connects power supply, negative pole is connected to the source electrode of PMOS pipe Q, the drain electrode of PMOS pipe Q is through resistance R 3 ground connection, described control circuit comprises operational amplifier M1 and operational amplifier M2, the positive pole input of operational amplifier M1 is connected to a reference voltage, the negative pole input is successively by adjustable resistance R1, resistance R 2 ground connection, its output is connected to the negative pole input through adjustable resistance R1, the output of operational amplifier M1 is also connected in the positive pole input of operational amplifier M2, the negative pole input of operational amplifier M2 is by resistance R 3 ground connection, and its output is connected to the grid of PMOS pipe Q.
2. controlled current formula led circuit according to claim 1 is characterized in that, described resistance R 2 also is adjustable resistance.
3. controlled current formula led circuit according to claim 1 is characterized in that, is provided with a protective resistance R4 between the grid of described PMOS pipe Q and the source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102335039A CN103281843A (en) | 2013-06-14 | 2013-06-14 | Current controllable type LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102335039A CN103281843A (en) | 2013-06-14 | 2013-06-14 | Current controllable type LED circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103281843A true CN103281843A (en) | 2013-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102335039A Pending CN103281843A (en) | 2013-06-14 | 2013-06-14 | Current controllable type LED circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN103281843A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050280A (en) * | 2015-08-11 | 2015-11-11 | 苏州晶雷光电照明科技有限公司 | Drive circuit of light-emitting diode (LED) corridor lighting system |
| CN106205509A (en) * | 2016-09-22 | 2016-12-07 | 京东方科技集团股份有限公司 | Drive circuit and driving method, backlight, display device and ignition device |
| CN106793266A (en) * | 2016-12-05 | 2017-05-31 | 黄超发 | A kind of programmable LEDbulb lamp of operating current |
Citations (5)
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| KR100682394B1 (en) * | 2006-03-17 | 2007-02-15 | (주)대신엘이디 | A current controller for led lamp and the led illuminator using the same |
| CN101146387A (en) * | 2007-10-10 | 2008-03-19 | 昝昕武 | A car background optical constant current control drive system and drive control method |
| CN102497699A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Method for adjusting brightness of LED (light emitting diode) illuminating lamp and LED driving circuit for PF (power factor) light dimming function |
| CN102548114A (en) * | 2010-12-07 | 2012-07-04 | 力林科技股份有限公司 | Light emitting diode driving device |
| CN203279312U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | LED control circuit capable of adjusting current |
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2013
- 2013-06-14 CN CN2013102335039A patent/CN103281843A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100682394B1 (en) * | 2006-03-17 | 2007-02-15 | (주)대신엘이디 | A current controller for led lamp and the led illuminator using the same |
| CN101146387A (en) * | 2007-10-10 | 2008-03-19 | 昝昕武 | A car background optical constant current control drive system and drive control method |
| CN102548114A (en) * | 2010-12-07 | 2012-07-04 | 力林科技股份有限公司 | Light emitting diode driving device |
| CN102497699A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Method for adjusting brightness of LED (light emitting diode) illuminating lamp and LED driving circuit for PF (power factor) light dimming function |
| CN203279312U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | LED control circuit capable of adjusting current |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050280A (en) * | 2015-08-11 | 2015-11-11 | 苏州晶雷光电照明科技有限公司 | Drive circuit of light-emitting diode (LED) corridor lighting system |
| CN105050280B (en) * | 2015-08-11 | 2018-11-30 | 苏州晶雷光电照明科技有限公司 | The driving circuit of LED corridor illuminating system |
| CN106205509A (en) * | 2016-09-22 | 2016-12-07 | 京东方科技集团股份有限公司 | Drive circuit and driving method, backlight, display device and ignition device |
| CN106205509B (en) * | 2016-09-22 | 2018-11-13 | 京东方科技集团股份有限公司 | Driving circuit and driving method, backlight, display device and ignition device |
| CN106793266A (en) * | 2016-12-05 | 2017-05-31 | 黄超发 | A kind of programmable LEDbulb lamp of operating current |
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Application publication date: 20130904 |