CN109348579A - A kind of LED constant current circuit - Google Patents
A kind of LED constant current circuit Download PDFInfo
- Publication number
- CN109348579A CN109348579A CN201811268237.2A CN201811268237A CN109348579A CN 109348579 A CN109348579 A CN 109348579A CN 201811268237 A CN201811268237 A CN 201811268237A CN 109348579 A CN109348579 A CN 109348579A
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- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 230000005669 field effect Effects 0.000 claims description 11
- 239000003381 stabilizer Substances 0.000 claims description 8
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
This application involves a kind of LED constant current circuits, including input rectification circuit, LED drive circuit, input rectification circuit is connect with LED drive circuit, it is characterized in that being additionally provided with voltage feedback circuit, voltage feedback circuit conducting when LED driving voltage is higher than LED load nominal input voltage shunts LED drive current.The voltage feedback circuit is made of first diode, 3rd resistor, the 5th capacitor, first diode anode connects LED driving voltage, first diode cathode, 3rd resistor one end, the 5th capacitor one end, LED drive circuit sample circuit one end link together, 3rd resistor, the 5th capacitor other end ground connection.The application is simple for structure, overcomes the inherent defect of inexpensive linear LED constant current circuit, realizes that high PF, low frequency dodge again simple, reliable, economic LED constant current circuit.
Description
Technical field
This application involves a kind of LED constant current circuits, are primarily adapted for use in LED illumination.
Background technique
The LED drive power of the prior art is complicated, it is at high cost, be easily damaged, and maintenance, repair are with high costs.
Summary of the invention
The technical issues of the application solves is to overcome the above deficiencies in the existing technologies, and provide a kind of structure letter
It is clean, easy to use, at low cost, the good LED constant current circuit of effect.
The application solves technical solution used by above-mentioned technical problem:
A kind of LED constant current circuit, including input rectification circuit, LED drive circuit, input rectification circuit and LED drive circuit connect
It connects, it is characterized in that being additionally provided with voltage feedback circuit, voltage feedback circuit is higher than the specified input of LED load in LED driving voltage
Conducting shunts LED drive current when voltage, to reduce LED driving voltage.
Herein described voltage feedback circuit is made of first diode, 3rd resistor, the 5th capacitor, and first diode is just
Pole connects LED driving voltage, and first diode cathode, 3rd resistor one end, the 5th capacitor one end, the sampling of LED drive circuit are electric
Road one end links together, 3rd resistor, the 5th capacitor other end ground connection.
The application is additionally provided with low frequency lightning road, and the low frequency lightning routes the second diode and third capacitor composition, the
Two diode collectors connect LED driving voltage, and the second diode emitters are connect with LED load anode, and third capacitance connection is extremely
LED load both ends.
Herein described LED drive circuit by the second capacitor, the second triode, first resistor, second resistance, voltage-stabiliser tube,
Field-effect tube, sample circuit composition, the second capacitor, first resistor one end be connected to the output of input rectification circuit, the first electricity
The resistance other end, fet gate, the second transistor collector, regulator tube negative are connected to together, the second transistor base with
The connection of second resistance one end, the second resistance other end, sample circuit one end, FET drain link together, the second capacitor
The other end, the second transistor emitter, voltage-stabiliser tube anode, sample circuit other end ground connection, it is negative that field-effect tube source electrode connects LED load
Pole.
The application compared with prior art, has the following advantages that and effect: it is simple for structure, overcome the linear LED of low cost
The inherent defect of constant-current circuit realizes that high PF, low frequency dodge again simple, reliable, economic LED constant current circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present application.
Specific embodiment
It is described in further detail with reference to the accompanying drawing and by embodiment to the application, following embodiment is to this Shen
Explanation please and the application is not limited to following embodiment.
Referring to Fig. 1, the present embodiment includes input rectification circuit (left side Fig. 1), LED drive circuit (Fig. 1 on the right of under), defeated
Enter rectification circuit to connect with LED drive circuit, design feature is to be additionally provided with voltage feedback circuit, and voltage feedback circuit exists
LED driving voltage is higher than LED load (top Fig. 1) nominal input voltage, and (i.e. the sample circuit voltage of LED drive circuit is higher than and sets
Definite value) when conducting shunt LED drive current, to reduce LED driving voltage.
Herein described voltage feedback circuit is made of first diode D1,3rd resistor R3, the 5th capacitor C5, and the one or two
Pole pipe D1 anode connects LED driving voltage, and first diode D1 cathode is connect with 3rd resistor R3 in parallel, the 5th one end capacitor C5
And connect with the sample circuit of LED drive circuit (the first sampling resistor RS1, the second sampling resistor RS2 parallel connection are constituted) one end, the
Three resistance R3, the 5th capacitor C5 other end ground connection.
The application is additionally provided with low frequency lightning road, and the low frequency lightning routes the second diode D2 and third capacitor C3 group
At, the second diode D2 collector connects LED driving voltage, and the second diode D2 emitter is connect with LED load positive (input),
Third capacitor C3 is connected to LED load both ends.The introducing of second diode D2 and third capacitor C3 are so that stroboscopic has obtained very
Big improvement.
Herein described LED drive circuit by the second capacitor C2, the second triode D2, first resistor R1, second resistance R2,
Voltage-stabiliser tube Z1, field-effect tube (power tube) D1, sample circuit composition, the second capacitor C2, first resistor R1 one end be connected to it is defeated
Enter the output of rectification circuit, the first resistor R1 other end, field-effect tube D1 grid, the second triode D2 collector, voltage-stabiliser tube Z1
Cathode is connected to together, and the second triode D2 base stage is connect with the one end second resistance R2, the second resistance R2 other end, sample circuit
One end, field-effect tube D1 drain electrode link together, and the second capacitor C2 other end, the second triode D2 emitter, voltage-stabiliser tube Z1 are just
Pole, sample circuit other end ground connection, field-effect tube D1 source electrode connect LED load cathode.
When LED driving voltage (LED load input voltage) is higher than nominal input voltage, to the LED and function of traditional circuit
Rate pipe Q1 is greatly to test, and it is linear that this circuit introduces first diode D1,3rd resistor R3 and the 5th capacitor C5 group
Voltage feedback circuit, so that lamps and lanterns work normally in the nominal input voltage range of LED lamp, when input voltage is higher than specified
When input voltage, voltage feedback circuit interventional systems reduce LED power, guarantee field-effect tube Q1 in reasonable dissipated power model
In enclosing, guarantee the reliability service of circuit.
The pressure drop of LED load work good input voltage rectification after LED driving voltage.Circuit normal work in voltage rating
Make, when grid voltage mutation, the quick interventional systems that voltage feedback circuit can be linear protect field-effect tube Q1 reasonable
Dissipated power range is unlikely to lead to its damage because field-effect tube Q1 is overheated, causes the crash of whole system.
The simple deformation or combination of all present techniques features and technical solution, it is considered that fall into the protection of the application
Range.
Claims (4)
1. a kind of LED constant current circuit, including input rectification circuit, LED drive circuit, input rectification circuit and LED drive circuit
Connection, it is characterized in that: being additionally provided with voltage feedback circuit, voltage feedback circuit is specified defeated higher than LED load in LED driving voltage
Conducting shunts LED drive current when entering voltage.
2. LED constant current circuit according to claim 1, it is characterized in that: the voltage feedback circuit is by first diode, third
Resistance, the 5th capacitor composition, first diode anode connect LED driving voltage, first diode cathode, 3rd resistor one end, the
Five capacitor one end, LED drive circuit sample circuit one end link together, 3rd resistor, the 5th capacitor other end ground connection.
3. LED constant current circuit according to claim 1 or claim 2, it is characterized in that: being additionally provided with low frequency lightning road, the low frequency dodges
Circuit is made of the second diode and third capacitor, and the second diode collector connects LED driving voltage, the second diode emitters
It is connect with LED load anode, third capacitance connection to LED load both ends.
4. LED constant current circuit according to claim 1 or claim 2, it is characterized in that: the LED drive circuit is by the second capacitor, second
Triode, first resistor, second resistance, voltage-stabiliser tube, field-effect tube, sample circuit composition, one end of the second capacitor, first resistor
It is connected to the output of input rectification circuit, the first resistor other end, fet gate, the second transistor collector, voltage-stabiliser tube
Cathode is connected to together, and the second transistor base is connect with second resistance one end, the second resistance other end, sample circuit one end,
FET drain links together, and the second capacitor other end, the second transistor emitter, voltage-stabiliser tube anode, sample circuit are another
One end ground connection, field-effect tube source electrode connect LED load cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811268237.2A CN109348579A (en) | 2018-10-29 | 2018-10-29 | A kind of LED constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811268237.2A CN109348579A (en) | 2018-10-29 | 2018-10-29 | A kind of LED constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109348579A true CN109348579A (en) | 2019-02-15 |
Family
ID=65311097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811268237.2A Pending CN109348579A (en) | 2018-10-29 | 2018-10-29 | A kind of LED constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109348579A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100102756A1 (en) * | 2008-10-28 | 2010-04-29 | Samsung Electro-Mechanics Co. Ltd. | Apparatus for driving light emitting device |
| CN103079311A (en) * | 2012-12-27 | 2013-05-01 | 木林森股份有限公司 | Double loop controlled LED (Light Emitting Diode) driving circuit |
| US20140266997A1 (en) * | 2013-03-15 | 2014-09-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Driving Circuit of Backlight Module, Method for Driving Backlight Module, and LCD Apparatus Incorporated With Such Backlight Module |
| US20150289325A1 (en) * | 2014-04-03 | 2015-10-08 | Linear Technology Corporation | Boost then floating buck mode converter for led driver using common switch control signal |
| CN106793271A (en) * | 2016-12-09 | 2017-05-31 | 欧普照明股份有限公司 | The linear constant current circuit of overvoltage protection |
| CN107734745A (en) * | 2017-10-17 | 2018-02-23 | 上海源微电子科技有限公司 | A kind of high efficiency half presses LED linear drive circuit |
| CN107911903A (en) * | 2017-12-06 | 2018-04-13 | 捷开通讯(深圳)有限公司 | Led drive circuit and mobile terminal |
| CN209643027U (en) * | 2018-10-29 | 2019-11-15 | 宁波耀泰电器有限公司 | LED constant current circuit |
-
2018
- 2018-10-29 CN CN201811268237.2A patent/CN109348579A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100102756A1 (en) * | 2008-10-28 | 2010-04-29 | Samsung Electro-Mechanics Co. Ltd. | Apparatus for driving light emitting device |
| CN103079311A (en) * | 2012-12-27 | 2013-05-01 | 木林森股份有限公司 | Double loop controlled LED (Light Emitting Diode) driving circuit |
| US20140266997A1 (en) * | 2013-03-15 | 2014-09-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Driving Circuit of Backlight Module, Method for Driving Backlight Module, and LCD Apparatus Incorporated With Such Backlight Module |
| US20150289325A1 (en) * | 2014-04-03 | 2015-10-08 | Linear Technology Corporation | Boost then floating buck mode converter for led driver using common switch control signal |
| CN106793271A (en) * | 2016-12-09 | 2017-05-31 | 欧普照明股份有限公司 | The linear constant current circuit of overvoltage protection |
| CN107734745A (en) * | 2017-10-17 | 2018-02-23 | 上海源微电子科技有限公司 | A kind of high efficiency half presses LED linear drive circuit |
| CN107911903A (en) * | 2017-12-06 | 2018-04-13 | 捷开通讯(深圳)有限公司 | Led drive circuit and mobile terminal |
| CN209643027U (en) * | 2018-10-29 | 2019-11-15 | 宁波耀泰电器有限公司 | LED constant current circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information |
Country or region after: China Address after: 315400 no.cn8, Far East Industrial City, Yuyao City, Ningbo City, Zhejiang Province Applicant after: Ningbo Yaotai Optoelectronic Technology Co.,Ltd. Address before: 315400 no.cn8, Far East Industrial City, Yuyao City, Ningbo City, Zhejiang Province Applicant before: Ningbo UTEC Electric Co.,Ltd. Country or region before: China |