CN107071986A - A kind of light adjusting circuit of LED lamp - Google Patents
A kind of light adjusting circuit of LED lamp Download PDFInfo
- Publication number
- CN107071986A CN107071986A CN201710400429.3A CN201710400429A CN107071986A CN 107071986 A CN107071986 A CN 107071986A CN 201710400429 A CN201710400429 A CN 201710400429A CN 107071986 A CN107071986 A CN 107071986A
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- CN
- China
- Prior art keywords
- circuit
- led lamp
- light adjusting
- resistance
- emitter follower
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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
Abstract
The present invention relates to a kind of light adjusting circuit of LED lamp, including for adjusting the direct current transformation output module and emitter follower circuit of brightness；The output end of the emitter follower circuit connects the brilliance control input of the direct current transformation module；The emitter follower circuit input access variable voltage signal source.A kind of light adjusting circuit of LED lamp of the present invention, plays following technique effect：1）By the pressure difference in emitter follower circuit, light adjusting circuit is turned off in advance, it is to avoid low side dims scintillation.2）Circuit structure is simple, there is provided stable 10V voltage signals when without external dim signal, makes circuit normal work, it is to avoid circuit is not exported during without dim signal.
Description
Technical field
The present invention relates to the light modulation field of LED lamp, more particularly to a kind of light adjusting circuit of LED lamp.
Background technology
Current 0-10V LED dimming drive powers mainstream schemes add secondary DC-DC to control core by prime changed power circuit
Piece is constituted, and signal dims pin by adjusting secondary DC-DC chips, changes electric power outputting current.The dim signal one of DC-DC chips
As be PWM/ADJ analog voltages, when using ADJ analog voltages as 0-10V dimmer applications due to the light modulation pin voltage of chip
Generally 0-6V, so the signal voltage of DC-DC chip requirements must be converted into meeting to 0-10V signals by bleeder circuit.
Common practice among prior art is to carry out partial pressure by outer meeting resistance, and this mode is simple and convenient, but meeting
There is a drawback：Due to the load capacity of 0-10V light modulators and the ripple size of signal voltage and chip internal light adjusting circuit
The influence of threshold voltage is turned on/off, is dimmed in signal voltage close to the situation that flicker occurs when closing threshold points, i.e. low side
Scintillation.
The content of the invention
In order to solve the above technical problems, The present invention provides a kind of light adjusting circuit of LED lamp.
A kind of light adjusting circuit of LED lamp, including for adjusting the direct current transformation output module and emitter following of brightness
Circuit；The output end of the emitter follower circuit connects the brilliance control input of the direct current transformation module；The emitter-base bandgap grading with
With circuit input end access variable voltage signal source.
Further, the emitter follower circuit includes signal input circuit and triode；The signal input circuit
Between the base stage and colelctor electrode that connect the triode, the input of the signal input circuit connects the variable voltage signal
Source.
Further, the signal input circuit includes first resistor, second resistance and voltage-stabiliser tube；The first resistor
One end connects and the transistor base is connected after driving power supply, other end series connection second resistance, the plus earth of the voltage-stabiliser tube,
Negative pole simultaneously connects the node between the transistor collector and the first resistor and second resistance.
Further, in addition to bleeder circuit, the bleeder circuit is arranged on the brilliance control input and described
Between emitter follower circuit output end.
Further, the bleeder circuit includes the 3rd resistor and the 4th resistance of series connection；Described 3rd resistor one end
The output end of the emitter follower circuit is connected, the other end is concatenated and is grounded after the 4th resistance；The 3rd resistor and the 4th
Node between resistance connects the brilliance control input.
Further, the bleeder circuit also includes the first electric capacity, first electric capacity and the 4th resistor coupled in parallel.
Further, the voltage range in the variable signal source is 0-10V.
Further, the triode is NPN triode.
A kind of light adjusting circuit of LED lamp of the present invention, plays following technique effect：
1）By the pressure difference of triode in emitter follower circuit, light adjusting circuit is turned off in advance, it is to avoid low side dims scintillation.
2）Circuit structure is simple, there is provided stable 10V voltage signals when without external dim signal, makes the normal work of circuit
Make, it is to avoid circuit is not exported during without dim signal.
Brief description of the drawings
Fig. 1 is architecture principle figure of the invention.
Fig. 2 is the real circuit theory diagrams of the present invention.
Driving power supply is 1；Direct current transformation output module is 2；Emitter follower circuit is 3；Signal input circuit is 31；Partial pressure
Circuit is 32；First resistor is R1；Second resistance is R2；3rd resistor is R3；4th resistance is R4；First electric capacity is C1；Surely
Pressure pipe is ZD1；Triode is Q1；DC-DC chips are U1；Variable voltage signal source is SIG；Brilliance control input is ADJ.
Embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention are more
Easily it is readily appreciated by one skilled in the art, so as to make apparent define to protection scope of the present invention.
In the prior art, due to the load capacity of light modulator and the ripple size of signal voltage and chip internal light adjusting circuit
The influence of threshold voltage is switched on or off, the situation of flicker, this phenomenon occur when voltage signal is close to closing threshold points
Referred to as low side dims scintillation.Low side light modulation flicker is existing to influence Consumer's Experience very much, or even the vision health of user can be made
Need to avoid this phenomenon to occur as far as possible into certain harm, therefore during design lamps.
Embodiment 1：
A kind of light adjusting circuit of LED lamp, is adjusted for the brightness to LED lamp, while low side light modulation sudden strain of a muscle will not be produced
Bright effect, as shown in figure 1, it includes driving power supply 1, direct current transformation output module 2 and emitter follower circuit 3.Driving power supply 1
220V municipal alternating current is converted into low-voltage dc power supply.Direct current transformation output module 2 is used to provide stable for LED lamp
Different voltage volt values output voltage, emitter follower circuit 3 then in order that output voltage in gamut more stablize.
Specifically, driving power supply 1 is changed alternating current by rectifier bridge, PWM controller and winding.Direct current transformation
Output module 2 is connected to the secondary of winding, including DC-DC chips U1 and its peripheral circuit, and it has a brilliance control defeated
Enter to hold ADJ, positive output end and negative output terminal.Positive output end and negative output terminal connect the positive pole and negative pole of LED lamp respectively.It is bright
Spend the voltage signal that control signal ADJ receives certain limit volt value, and according to the size of voltage signal come to the bright of LED lamp
Degree is controlled, in the present embodiment, and the volt value of voltage signal is bigger, then the brightness of LED lamp is higher.
The voltage signal that brilliance control input ADJ is received is obtained by variable voltage signal source SIG, variable voltage signal source
SIG can be 0-10V analog signals.Variable voltage signal source SIG needs indirectly defeated with direct current transformation by emitter follower circuit 3
Go out module 2 to connect.Emitter follower circuit 3 includes input and output end, and its output end connects the brightness of direct current transformation module
Control signal ADJ, input then accesses variable voltage signal source SIG.By the regulation of related component, in dimmer voltage letter
Number be less than certain value when, emitter follower circuit 3 then disconnects, so by the value rise above low side light modulation scintillation occur
Voltage threshold can be so that direct current transformation output module 2 be stopped in advance, it is to avoid low side dims the appearance of scintillation.
In the present embodiment, the voltage range in variable signal source is between 0V to 10V.
Embodiment 2：
Improved as one kind of embodiment 1, the present embodiment and the difference of embodiment 1 be, as shown in Fig. 2 the present embodiment is penetrated
It is NPN triode Q1 that pole, which follows circuit 3 to include the triode Q1 in signal input circuit 31 and triode Q1 the present embodiment,.Letter
The input connection variable voltage signal source SIG of number input circuit 31.In terms of with triode Q1 cooperations, signal input circuit 31
Between connecting triode Q1 base stage and colelctor electrode, it provides stable voltage for triode Q1 base stage, while preventing when not
The problem of pin is hanging is mistakenly considered when having variable voltage signal.
And the aspect of signal input circuit 31, including first resistor R1, second resistance R2 and voltage-stabiliser tube ZD1；First resistor
R1 one end connects connecting triode Q1 base stages after driving power supply 1, other end series connection second resistance R2, and voltage-stabiliser tube ZD1 positive pole connects
Ground, negative pole simultaneously connects the node between triode Q1 colelctor electrodes and first resistor R1 and second resistance R2.Voltage-stabiliser tube ZD1 is by first
Node voltage between resistance R1 and second resistance R2 is limited in the value of a determination, it is ensured that triode Q1 collection during work
The current potential of electrode is stable.Voltage is provided to triode Q1 base stages, it is to avoid circuit is not exported during without dim signal simultaneously.In addition,
In order to protect DC-DC chips U1, it is necessary to provide voltage range needed for chip brightness control signal ADJ, in addition to bleeder circuit
32, the bleeder circuit 32 is arranged between brilliance control input ADJ and the output end of emitter follower circuit 3.Bleeder circuit 32
The first electric capacity C1,3rd resistor R3 and the 4th resistance R4 including series connection；3rd resistor R3 one end connects emitter follower circuit 3
Output end, the other end concatenate the 4th resistance R4 after be grounded；Node connection brightness between 3rd resistor R3 and the 4th resistance R4
Control signal ADJ.Other first electric capacity C1 is in parallel with the 4th resistance R4.
In the course of the work, the 0-10V voltage signals that variable voltage signal source SIG is sent add the light adjusting circuit of the present embodiment
In triode Q1 base stage, dim signal is converted to after emitter follower circuit 3, and is exported from triode Q1 emitter stage,
After partial pressure by bleeder circuit 32, dim signal formation meets the signal voltage of DC-DC chips U1 requirements.
During this, it is assumed that the DC-DC chips U1 of direct current transformation output module 2 shut-off threshold values is 0.2V, pass through adjustment the
Three resistance R3 and the 4th resistance R4 resistance size, it is to avoid when dimmer voltage signal is close to triode operation/shut-off point, the 3rd
Resistance R3 and the 4th resistance R4 resistance branch pressure voltage signal turn off threshold points in DC-DC chips U1.Due to Q1B-E grades of triode
Voltage be 0.5V-0.7V when, emitter follower circuit 3 just starts normal work, you can time variant voltage signal source SIG voltage is less than
Triode Q1 has been turned off during 0.5V, and now DC-DC chips U1 brilliance control input ADJ no-voltages, i.e., have turned off in advance
Dim signal, so as to effectively evade low side light modulation scintillation.
In the present embodiment, DC-DC chips U1 for light modulation mouth need to connect the chip of high level normal work, its model can with but not
It is only limitted to as SD42527.
Embodiments of the present invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned implementation
Mode, can also be on the premise of present inventive concept not be departed from the knowledge that those of ordinary skill in the art possess
Various changes can be made.
Claims (8)
1. a kind of light adjusting circuit of LED lamp, it is characterised in that：Including for adjust brightness direct current transformation output module and
Emitter follower circuit；The output end of the emitter follower circuit connects the brilliance control input of the direct current transformation module；Institute
State emitter follower circuit input access variable voltage signal source.
2. the light adjusting circuit of LED lamp according to claim 1, it is characterised in that the emitter follower circuit includes letter
Number input circuit and triode；The signal input circuit is connected between the base stage and colelctor electrode of the triode, the letter
The input of number input circuit connects the variable voltage signal source.
3. the light adjusting circuit of LED lamp according to claim 2, it is characterised in that the signal input circuit includes the
One resistance, second resistance and voltage-stabiliser tube；Described first resistor one end connects after connecting driving power supply, other end series connection second resistance
The transistor base is connect, the plus earth of the voltage-stabiliser tube, negative pole simultaneously connects the transistor collector and first electricity
Node between resistance and second resistance.
4. the light adjusting circuit of LED lamp according to claim 1, it is characterised in that also including bleeder circuit, the partial pressure
Circuit is arranged between the brilliance control input and the emitter follower circuit output end.
5. the light adjusting circuit of LED lamp according to claim 4, it is characterised in that the bleeder circuit includes series connection
3rd resistor and the 4th resistance；Described 3rd resistor one end connects the output end of the emitter follower circuit, other end concatenation
It is grounded after 4th resistance；Node between the 3rd resistor and the 4th resistance connects the brilliance control input.
6. the light adjusting circuit of LED lamp according to claim 5, it is characterised in that the bleeder circuit also includes first
Electric capacity, first electric capacity and the 4th resistor coupled in parallel.
7. the light adjusting circuit of LED lamp according to claim 6, it is characterised in that the voltage model in the variable signal source
Enclose for 0-10V.
8. the light adjusting circuit of LED lamp according to claim 1, it is characterised in that the triode is NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710400429.3A CN107071986B (en) | 2017-05-31 | 2017-05-31 | A kind of light adjusting circuit of LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710400429.3A CN107071986B (en) | 2017-05-31 | 2017-05-31 | A kind of light adjusting circuit of LED lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107071986A true CN107071986A (en) | 2017-08-18 |
| CN107071986B CN107071986B (en) | 2019-02-01 |
Family
ID=59615351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710400429.3A Active CN107071986B (en) | 2017-05-31 | 2017-05-31 | A kind of light adjusting circuit of LED lamp |
Country Status (1)
| Country | Link |
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| CN (1) | CN107071986B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106852A (en) * | 2007-06-25 | 2008-01-16 | 四川大学 | Current constant and light adjusting control circuit for luminescent LED array |
| WO2012016716A1 (en) * | 2010-08-06 | 2012-02-09 | Tridonic Uk Ltd. | Led dimming control |
| CN104242620A (en) * | 2014-09-01 | 2014-12-24 | 成都芯源系统有限公司 | system with ripple suppression circuit and ripple suppression method thereof |
| CN104470149A (en) * | 2014-12-25 | 2015-03-25 | 东莞卫光电子科技有限公司 | Dimming circuit suitable for multiple dimming modes |
| CN204482133U (en) * | 2015-04-24 | 2015-07-15 | 惠州市西顿工业发展有限公司 | A kind of LED constant pressure and flow drive circuit |
| CN105491723A (en) * | 2015-12-31 | 2016-04-13 | 茂硕电源科技股份有限公司 | Dimming circuit system |
| CN205847661U (en) * | 2016-06-29 | 2016-12-28 | 广州中大南沙科技创新产业园有限公司 | A kind of LED power of configurable output electric current |
| CN207083252U (en) * | 2017-05-31 | 2018-03-09 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
-
2017
- 2017-05-31 CN CN201710400429.3A patent/CN107071986B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106852A (en) * | 2007-06-25 | 2008-01-16 | 四川大学 | Current constant and light adjusting control circuit for luminescent LED array |
| WO2012016716A1 (en) * | 2010-08-06 | 2012-02-09 | Tridonic Uk Ltd. | Led dimming control |
| CN104242620A (en) * | 2014-09-01 | 2014-12-24 | 成都芯源系统有限公司 | system with ripple suppression circuit and ripple suppression method thereof |
| CN104470149A (en) * | 2014-12-25 | 2015-03-25 | 东莞卫光电子科技有限公司 | Dimming circuit suitable for multiple dimming modes |
| CN204482133U (en) * | 2015-04-24 | 2015-07-15 | 惠州市西顿工业发展有限公司 | A kind of LED constant pressure and flow drive circuit |
| CN105491723A (en) * | 2015-12-31 | 2016-04-13 | 茂硕电源科技股份有限公司 | Dimming circuit system |
| CN205847661U (en) * | 2016-06-29 | 2016-12-28 | 广州中大南沙科技创新产业园有限公司 | A kind of LED power of configurable output electric current |
| CN207083252U (en) * | 2017-05-31 | 2018-03-09 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
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| Publication number | Publication date |
|---|---|
| CN107071986B (en) | 2019-02-01 |
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