CN207083252U - A kind of light adjusting circuit of LED lamp - Google Patents
A kind of light adjusting circuit of LED lamp Download PDFInfo
- Publication number
- CN207083252U CN207083252U CN201720620683.XU CN201720620683U CN207083252U CN 207083252 U CN207083252 U CN 207083252U CN 201720620683 U CN201720620683 U CN 201720620683U CN 207083252 U CN207083252 U CN 207083252U
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- China
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- circuit
- led lamp
- light adjusting
- resistance
- emitter follower
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Abstract
A kind of light adjusting circuit of LED lamp is the utility model is related to, 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 utility model, plays following technique effect：1）By the pressure difference in emitter follower circuit, light adjusting circuit is turned off in advance, avoids low side from dimming scintillation.2）Circuit structure is simple, when without external dim signal, there is provided stable 10V voltage signals, makes circuit normal work, avoids circuit during no dim signal from not exporting.
Description
Technical field
The light modulation field of LED lamp is the utility model is related to, more particularly to a kind of light adjusting circuit of LED lamp.
Background technology
0-10V LED dimming drive powers mainstream scheme adds secondary DC-DC to control core by prime changed power circuit at present
Piece forms, 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 for meeting DC-DC chip requirements must be converted into by bleeder circuit to 0-10V signals.
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
The utility model is in order to solve the above-mentioned technical problem, there is provided 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 the 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 driving power, and the transistor base is connected after 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 grounded after concatenating 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 utility model, plays following technique effect：
1）By the pressure difference of triode in emitter follower circuit, light adjusting circuit is turned off in advance, avoids low side light modulation flicker existing
As.
2）Circuit structure is simple, when without external dim signal, there is provided stable 10V voltage signals, makes the normal work of circuit
Make, avoid circuit during no dim signal from not exporting.
Brief description of the drawings
Fig. 1 is architecture principle figure of the present utility model.
Fig. 2 is the real circuit theory diagrams of the utility model.
Driving power 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
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model
It is more easy to be readily appreciated by one skilled in the art with feature, so as to make the scope of protection of the utility model apparent define.
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 light modulation 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 will not produce low side tune
Optical flare effect, as shown in figure 1, it includes driving power 1, direct current transformation output module 2 and emitter follower circuit 3.Driving
220V municipal alternating current is converted into low-voltage dc power supply by power supply 1.Direct current transformation output module 2 is used to carry for LED lamp
For the output voltage of stable different voltage volt values, emitter follower circuit 3 is then in order that output voltage is more steady in gamut
It is fixed.
Specifically, driving power 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
The voltage signal that control signal ADJ receives certain limit volt value is spent, and according to the size of voltage signal come to the bright of LED lamp
Degree is controlled, and in the present embodiment, 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 access variable voltage signal source SIG.By the regulation of related component, believe in dimmer voltage
When number being less than certain value, emitter follower circuit 3 is then disconnected, and then the value is risen above into what low side light modulation scintillation occurred
Voltage threshold so that direct current transformation output module 2 is stopped in advance, can avoid the appearance of low side light modulation scintillation.
In the present embodiment, the voltage range in variable signal source is between 0V to 10V.
Embodiment 2：
One kind as embodiment 1 is improved, and the present embodiment and the difference of embodiment 1 are, as shown in Fig. 2 the present embodiment
The triode Q1 that includes in signal input circuit 31 and triode Q1 the present embodiment of emitter follower circuit 3 be NPN triode
Q1.The input connection variable voltage signal source SIG of signal input circuit 31.In terms of with triode Q1 cooperations, signal input
Between the connecting triode Q1 of circuit 31 base stage and colelctor electrode, it provides stable voltage for triode Q1 base stage, prevents simultaneously
Only the problem of pin is hanging is mistakenly considered when no 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 driving power 1, and connecting triode Q1 base stages after other end series connection second resistance R2, voltage-stabiliser tube ZD1 positive pole connects
Ground, negative pole simultaneously connect 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, triode Q1 collection when ensure that work
The current potential of electrode is stable.Voltage is provided to triode Q1 base stages simultaneously, avoids circuit during no dim signal from not exporting.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 forms the signal voltage for meeting 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 be 0.2V, by adjusting the
Three resistance R3 and the 4th resistance R4 resistance size, 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 triode Q1B-E levels
Voltage when being 0.5V-0.7V, 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 is that 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.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to
Above-mentioned embodiment, in those of ordinary skill in the art's possessed knowledge, the utility model can also not departed from
Various changes can be made on the premise of objective.
Claims (8)
- A kind of 1. 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 base stage and the 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 driving power, connects after other end series connection second resistance The transistor base, the plus earth of the voltage-stabiliser tube are connect, 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 2, it is characterised in that the triode is NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720620683.XU CN207083252U (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 |
|---|---|---|---|
| CN201720620683.XU CN207083252U (en) | 2017-05-31 | 2017-05-31 | A kind of light adjusting circuit of LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207083252U true CN207083252U (en) | 2018-03-09 |
Family
ID=61436813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720620683.XU Withdrawn - After Issue CN207083252U (en) | 2017-05-31 | 2017-05-31 | A kind of light adjusting circuit of LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207083252U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071986A (en) * | 2017-05-31 | 2017-08-18 | 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 CN201720620683.XU patent/CN207083252U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071986A (en) * | 2017-05-31 | 2017-08-18 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
| CN107071986B (en) * | 2017-05-31 | 2019-02-01 | 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180309 Effective date of abandoning: 20190201 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180309 Effective date of abandoning: 20190201 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |