CN108934110A - Adjusting control circuit and its control method under LED light low-light level - Google Patents
Adjusting control circuit and its control method under LED light low-light level Download PDFInfo
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- CN108934110A CN108934110A CN201810951151.3A CN201810951151A CN108934110A CN 108934110 A CN108934110 A CN 108934110A CN 201810951151 A CN201810951151 A CN 201810951151A CN 108934110 A CN108934110 A CN 108934110A
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- triode
- led light
- resistance
- dimming driver
- control circuit
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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]
- H05B45/10—Controlling the intensity of the light
Abstract
The present invention relates to the adjusting control circuits and its control method under a kind of LED light low-light level.Adjusting control circuit includes triode Q1 and triode Q2 and dimming driver, the base stage of triode Q1 is not only connected with the anode of dimming driver through resistance R1 but also is connected through resistance R2 with the cathode of dimming driver, collector, the emitter of triode Q1 is connected with the anode of dimming driver, cathode respectively, the collector of triode Q1 is connected with the base stage of triode Q2, collector, the emitter of triode Q2 is connected with the anode of dimming driver, cathode respectively, and collector, the emitter of triode Q2 is also connected with the anode of LED light, cathode respectively.When the output electric current I of dimming driver is lower than threshold current value I1 and is higher than threshold current value I2, triode Q1 and triode Q2 are in half on state, at this time with the variation of the output electric current I of dimming driver, the curved variation of electric current in LED light is flowed through, realizes the dimming effect of LED light in low current conditions.
Description
Technical field
The present invention relates under a kind of LED lamp drive circuit more particularly to a kind of LED light low-light level adjusting control circuit and
Its control method.
Background technique
The brightness of lamp is adjusted using controllable silicon dimmer, the relatively early light modulation electricity for being just applied to incandescent lamp and energy-saving lamp before
Road, and a kind of relatively more extensive dimming mode is applied to obtain in LED light dimming arrangement at present.Its working principle is that: use can
Control silicon light modulator adjusts the angle of flow of each half-wave of alternating current to change sinusoidal waveform, changes the virtual value of AC input current,
The output electric current of driving also changes therewith simultaneously, to realize the dimming effect of LED light.But controllable silicon dimmer type is numerous
It is more, when controllable silicon dimmer adjusting in part outputs current to about 3% or less, light modulation effect can be lost, that is to say, that in LED
When under lamp low-light level, current controllable silicon dimmer can not achieve the control to output electric current, that is, can not achieve dimming effect.
Summary of the invention
In order to solve the above-mentioned technical problem the present invention, provides the adjusting control circuit under a kind of LED light low-light level and its control
Under LED light low-light level still method processed can realize the dimming effect to LED light, i.e., when light modulator low current exports
It is able to achieve dimming effect.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals: LED light of the invention is low
Adjusting control circuit under brightness, including triode Q1 and triode Q2 and dimming driver, the base stage of triode Q1 is both through electricity
Resistance R1 is connected with the anode of dimming driver and is connected through resistance R2 with the cathode of dimming driver, the collector of triode Q1,
Emitter is connected with the anode of dimming driver, cathode respectively, and the collector of triode Q1 is connected with the base stage of triode Q2, and three
Collector, the emitter of pole pipe Q2 is connected with the anode of dimming driver, cathode respectively, collector, the emitter of triode Q2
Also it is connected respectively with the anode of LED light, cathode.Two triodes constitute power circuit.When the output electric current I of dimming driver is big
When threshold current value I1, triode Q1 conducting, triode Q2 cut-off；When the output electric current I of dimming driver is less than
Or when being equal to threshold current value I2, triode Q1 cut-off, triode Q2 conducting.When the output electric current I of dimming driver is lower than door
Flow valuve of rationing the power supply I1 and be higher than threshold current value I2 when, triode Q1 and triode Q2 are in half on state, work and are putting
Great Qu, at this time when the output electric current of dimming driver reduces, the brightness decline of LED light.I.e. with the output of dimming driver
The curved variation of electric current in LED light is flowed through in the variation of electric current I, and the brightness of LED light is still adjustable at this time.To realize that LED light exists
Dimming effect under low current condition.
Preferably, anode of the collector of the triode Q1 through resistance R3 and dimming driver.
Preferably, the emitter of the triode Q2 is connected through resistance R4 with the cathode of LED light.
Preferably, the adjusting control circuit under the LED light low-light level includes resistance R5, one end of resistance R5 and institute
The cathode for the dimming driver stated is connected, and the other end of resistance R5 is connected through resistance R2 with the base stage of triode Q1.
Preferably, the resistance R1 and resistance R2 are variable resistance.Change the resistance value of resistance R1 and resistance R2, it is adjustable
Whole dimming driver output electric current I threshold current value I1 and threshold current value I2, with different dimming driver phases
Match.
Preferably, the triode Q1 and triode Q2 is NPN type triode.
Preferably, the dimming driver is controllable silicon dimmer.
The control method of adjusting control circuit under LED light low-light level of the invention are as follows: in the dimming driver
Under adjusting, when the output electric current I of dimming driver is greater than or equal to threshold current value I1, triode Q1 conducting, triode Q2
Cut-off, the brightness of the LED light is not influenced by adjusting control circuit at this time；Under the adjusting of dimming driver, work as light modulation
For the output electric current I of driver lower than threshold current value I1 and when being higher than threshold current value I2, triode Q1 is in half on state,
In amplification region, triode Q2 is begun to turn on for work, is also at half on state, is worked in amplification region, at this time as light modulation drives
The variation of the output electric current I of device, flows through the curved variation of electric current in LED light, i.e. the brightness of LED light is adjustable；It is driven in light modulation
Under the adjusting of device, when the output electric current I of dimming driver is less than or equal to threshold current value I2, triode Q1 cut-off, three poles
Pipe Q2 conducting, no current flows through in the LED light at this time, and LED light is extinguished.
Preferably, changing the resistance value of resistance R1 and resistance R2, the thresholding electricity of the output electric current I of dimming driver can adjust
Flow valuve I1 and threshold current value I2, to match with different dimming drivers.
The beneficial effects of the present invention are: the power circuit being made up of two triodes, makes it in light modulator low current
It realizes in the case of output to the dimming effect of LED light, i.e., is still able to achieve dimming effect under LED light low-light level, expands LED light
Dimming scope, using more flexible and conveniently.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the invention.
1. dimming driver in figure, 2.LED lamp.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment: the adjusting control circuit under the LED light low-light level of the present embodiment, as shown in Figure 1, include triode Q1 and
Triode Q2 and dimming driver 1, the base stage of triode Q1 are connected through resistance R1 with the anode of dimming driver all the way, another
Road is connected with one end of resistance R2, and the other end of resistance R2 is connected through resistance R5 with the emitter of triode Q1, triode Q1's
Emitter is connected with the cathode of dimming driver, and the collector of triode Q1 is connected through resistance R3 with the anode of dimming driver,
The collector of triode Q1 is connected with the base stage of triode Q2, and the collector of triode Q2 was both connected with the anode of dimming driver
It is connected again with the anode of LED light 2, the emitter of triode Q2 is connected with one end of resistance R4, the other end of resistance R4, both and electric
Resistance R2 is connected with the tie point of resistance R5, and is connected with the cathode of LED light.Triode Q1 and triode Q2 is three pole of NPN type
Pipe, dimming driver is controllable silicon dimmer, and resistance R1 and resistance R2 are all made of variable resistance.
The control method of adjusting control circuit under above-mentioned LED light low-light level are as follows:
Under the adjusting of dimming driver, when the output electric current I of dimming driver is greater than or equal to threshold current value I1,
The base voltage of triode Q1 reaches the condition of opening, and triode Q1 conducting, the voltage of the base stage of triode Q2 is by triode at this time
The collector voltage of Q1 drags down, then triode Q2 ends, only faint at this time current flowing resistance R3 and triode Q1, therefore
The brightness of LED light is not influenced by adjusting control circuit；
Under the adjusting of dimming driver, when the output electric current I of dimming driver lower than threshold current value I1 and is higher than door
Ration the power supply flow valuve I2 when, the base voltage of triode Q1 declines with the reduction of dimming driver output electric current, at triode Q1
In half on state, work rises in amplification region, the base voltage of triode Q2, and triode Q2 begins to turn on, is also at and partly leads
Logical state, work is in amplification region, then the output electric current of dimming driver flows through the loop of power circuit that triode Q2 and resistance R4 is constituted,
When the output electric current of dimming driver reduces, the brightness decline of LED light.I.e. with the change of the output electric current I of dimming driver
Change, flows through the curved variation of electric current in LED light, the brightness of LED light is adjustable；
Under the adjusting of dimming driver, when the output electric current I of dimming driver is less than or equal to threshold current value I2,
Triode Q1 is completely switched off, and the base voltage of triode Q2 increases, and triode Q2 is fully on, the electric current of dimming driver output
The loop of power circuit that triode Q2 and resistance R4 is constituted is flowed completely through, no current flows through in LED light at this time, and LED light is extinguished.
Change resistance R1 and resistance R2 resistance value, can adjust dimming driver output electric current I threshold current value I1 and
Threshold current value I2, to match with different dimming drivers.
The present invention passes through the power circuit that two triodes are constituted, and makes it to realize when light modulator low current exports
To the dimming effect of LED light, i.e., it is still able to achieve dimming effect under LED light low-light level, expands the dimming scope of LED light, used
It is more flexible and conveniently.
Claims (9)
1. the adjusting control circuit under a kind of LED light low-light level, it is characterised in that including triode Q1 and triode Q2 and light modulation
Driver, the base stage of triode Q1 be not only connected with the anode of dimming driver through resistance R1 but also through resistance R2 and dimming drivers
Cathode is connected, and collector, the emitter of triode Q1 is connected with the anode of dimming driver, cathode respectively, the collection of triode Q1
Electrode is connected with the base stage of triode Q2, the collector of triode Q2, emitter respectively with the anode of dimming driver, cathode phase
Even, collector, the emitter of triode Q2 is also connected with the anode of LED light, cathode respectively.
2. the adjusting control circuit under LED light low-light level according to claim 1, it is characterised in that the triode Q1
Anode of the collector through resistance R3 and dimming driver.
3. the adjusting control circuit under LED light low-light level according to claim 1, it is characterised in that the triode Q2
Emitter be connected through resistance R4 with the cathode of LED light.
4. the adjusting control circuit under LED light low-light level according to claim 3, it is characterised in that including resistance R5, electricity
One end of resistance R5 is connected with the cathode of the dimming driver, base stage of the other end of resistance R5 through resistance R2 and triode Q1
It is connected.
5. the adjusting control circuit under LED light low-light level according to claim 1 or 2 or 3, it is characterised in that the electricity
Resistance R1 and resistance R2 is variable resistance.
6. the adjusting control circuit under LED light low-light level according to claim 1 or 2 or 3, it is characterised in that described three
Pole pipe Q1 and triode Q2 is NPN type triode.
7. the adjusting control circuit under LED light low-light level according to claim 1 or 2 or 3, it is characterised in that the tune
CD-ROM driver is controllable silicon dimmer.
8. a kind of control method of the adjusting control circuit under LED light low-light level as described in claim 1, it is characterised in that
Under the adjusting of the dimming driver, when the output electric current I of dimming driver is greater than or equal to threshold current value I1, three poles
Pipe Q1 conducting, triode Q2 cut-off, the brightness of the LED light is not influenced by adjusting control circuit at this time；It is driven in light modulation
Under the adjusting of device, when the output electric current I of dimming driver is lower than threshold current value I1 and is higher than threshold current value I2, triode
Q1 is in half on state, works in amplification region, and triode Q2 is begun to turn on, and is also at half on state, works in amplification region,
At this time with the variation of the output electric current I of dimming driver, the curved variation of electric current in LED light, the i.e. brightness of LED light are flowed through
It is adjustable；Under the adjusting of dimming driver, when the output electric current I of dimming driver is less than or equal to threshold current value I2, three
Pole pipe Q1 cut-off, triode Q2 conducting, no current flows through in the LED light at this time, and LED light is extinguished.
9. the control method of the adjusting control circuit under LED light low-light level according to claim 8, it is characterised in that change
The resistance value of resistance R1 and resistance R2 can adjust the threshold current value I1 and threshold current value I2 of the output electric current I of dimming driver,
To match with different dimming drivers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810951151.3A CN108934110B (en) | 2018-08-20 | 2018-08-20 | Dimming control circuit and method for LED lamp at low brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810951151.3A CN108934110B (en) | 2018-08-20 | 2018-08-20 | Dimming control circuit and method for LED lamp at low brightness |
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| CN108934110A true CN108934110A (en) | 2018-12-04 |
| CN108934110B CN108934110B (en) | 2020-01-31 |
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| CN201810951151.3A Active CN108934110B (en) | 2018-08-20 | 2018-08-20 | Dimming control circuit and method for LED lamp at low brightness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117528858A (en) * | 2024-01-08 | 2024-02-06 | 杭州罗莱迪思科技股份有限公司 | Hidden-lighting controllable dimming lamp control method |
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| CN102014546A (en) * | 2009-09-04 | 2011-04-13 | 东芝照明技术株式会社 | Led lighting device and illumination apparatus |
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| US20150257222A1 (en) * | 2014-03-04 | 2015-09-10 | Osram Sylvania Inc. | Hybrid dimming control techniques for led drivers |
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Cited By (2)
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| CN108934110B (en) | 2020-01-31 |
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Address after: No.12 tingchao Road, Jianshan New District, Haining City, Jiaxing City, Zhejiang Province Patentee after: Zhejiang kaiyao Lighting Co.,Ltd. Address before: No.12 tingchao Road, Jianshan New District, Haining City, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG KLITE LIGHTING HOLDINGS Co.,Ltd. |