CN103025031A - Dimming circuit and dimming method for LED light supplementing lamp - Google Patents
Dimming circuit and dimming method for LED light supplementing lamp Download PDFInfo
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- CN103025031A CN103025031A CN2012105864985A CN201210586498A CN103025031A CN 103025031 A CN103025031 A CN 103025031A CN 2012105864985 A CN2012105864985 A CN 2012105864985A CN 201210586498 A CN201210586498 A CN 201210586498A CN 103025031 A CN103025031 A CN 103025031A
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Abstract
The invention discloses a dimming circuit and a dimming method for an LED light supplementing lamp. An input end of a reference voltage module in the dimming circuit is connected with a power source, an output end of the reference voltage module is connected with a voltage sampling circuit, an amplifier and a single chip microcomputer, an output end of the voltage sampling circuit is connected with the amplifier, an output end of the amplifier is connected with the single chip microcomputer, the single chip microcomputer is connected with a constant-current driving circuit, and the constant-current driving circuit is in drive connection with an LED. The dimming method includes steps of (1), acquiring a reference voltage source via the reference voltage module; (2), matching a potentiometer with a divider resistor to sample signals; (3), enabling an operational amplifier circuit to process the signals so as to remove interference signals; (4), enabling the single chip microcomputer to complete high-precision A/D (analog/digital) conversion to obtain digital signals; (5), processing the digital signals to obtain digital PWM (pulse-width modulation) signals; and (6), adjusting the constant-current driving circuit by the digital PWM signals to control brightness variation of the LED. According to the dimming scheme, the dimming circuit and the dimming method have the advantages of high dimming precision, accurate brightness control, few required peripheral devices and the like.
Description
Technical field
The present invention relates to a kind of LED light compensating lamp technology, be specifically related to the light regulating technology in a kind of LED light compensating lamp.
Background technology
The brightness adjustment control of LED light compensating lamp series of products is to adopt analog control mode to realize the electrodeless adjusting of brightness at present, and the principle that concrete light modulation realizes as shown in Figure 1.
According to Fig. 1 as can be known, the light adjusting circuit of existing LED light compensating lamp mainly comprise voltage adopt circuit 1, because amplifier 2, the MOSFET drive circuit 3 that amplifier IC consists of, wherein voltage adopts circuit 1 and power supply 4 to join, its output and amplifier 2 join, amplifier 2 connects MOSFET drive circuit 3, is driven by MOSFET drive circuit 3 to connect LED5 again.
The supply current to LED carries out sampling feedback to this light adjusting circuit in the voltage employing circuit 1 by voltage source is inserted when LED is carried out light modulation, and sampled signal reached in the amplifier 2 cushion, the control that gains of 2 pairs of LED electric currents of amplifier, the final analog control signal that forms also reaches MOSFET drive circuit 3, by it LED5 is controlled.The shortcoming of this circuit for regulating and controlling is that the MOSFET drive circuit consists of the loop by a plurality of triodes, and element is many, and circuit is complicated.
The dimming mode that carries out based on above-mentioned light adjusting circuit is realized the electrodeless adjusting of brightness by analog control mode, the colour temperature of the light that this regulative mode control LED sends can change along with the variation of LED electric current, and be applied to light filling when illumination, color to LED is most important, and the deficiency of this kind control mode is especially obvious; Moreover existing dimming mode can't accurately be controlled the concrete amount of luminosity.
Summary of the invention
The present invention is directed to the existing problem of light regulating technology of existing LED light compensating lamp, and a kind of follow-on LED light compensating lamp light adjusting circuit is provided.This light adjusting circuit by with analog signal conversion to digital signal, realize the digitized brilliance control that comes.
As the second purpose of the present invention, the present invention also provides a kind of light-dimming method of LED light compensating lamp, and the method can not change the drive current of LED, so that the colour temperature of the light that LED sends can not change the requirement when satisfying the light filling illumination.
In order to achieve the above object, the present invention adopts following technical scheme:
LED light compensating lamp light adjusting circuit, described light adjusting circuit comprises voltage sampling circuit, amplifier, it also comprises reference voltage module, single-chip microcomputer, constant-current drive circuit, the input of described reference voltage module connects power supply, output connects voltage sampling circuit, amplifier and single-chip microcomputer, and described voltage sampling circuit output connects amplifier, and the output of described amplifier connects single-chip microcomputer, described single-chip microcomputer connects constant-current drive circuit, and described constant-current drive circuit drives and connects LED.
In preferred embodiment of the present invention, described voltage sampling circuit comprises potentiometer and divider resistance.
The light-dimming method of LED light compensating lamp, the method comprises the steps:
(1) obtains reference voltage source by the reference voltage module;
(2) cooperate divider resistance that the reference voltage that reference voltage source provides is carried out dividing potential drop by potentiometer, finish sampling;
(3) signal that obtains of sampling is processed the removal interference signal through operational amplification circuit;
(4) signal after the processing, input single-chip microcomputer are finished high-precision A/D conversion, obtain corresponding digital signal;
(5) digital signal that is converted to is processed the digital PWM signal that obtains greater than 200Hz;
(6) the digital PWM signal is adjusted the output duty cycle of constant-current drive circuit, controls LED brightness with this and changes.
In the technical scheme of light-dimming method, operational amplification circuit adopts the mode of operation of voltage follow in the described step (3).
Compare with existing simulation light regulating technology according to the light adjusting circuit that such scheme obtains, the light modulation precision is higher, and brilliance control is more accurate, and the peripheral components consumption still less.
Can accurately control the concrete amount of luminosity at dimming mode provided by the invention, by not changing the drive current of LED, the colour temperature of the light that maintenance LED sends is constant.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the schematic diagram of existing light adjusting circuit;
Fig. 2 is the schematic diagram of light adjusting circuit among the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 2, LED light compensating lamp light adjusting circuit 100 provided by the invention mainly comprises LDU module 101, voltage sampling circuit 102, amplifier 103, single-chip microcomputer 104 and constant-current drive circuit 105.
The reference voltage that voltage sampling circuit 102 is used for LDU module 101 is provided adopts.It mainly comprises potentiometer and divider resistance, cooperates the realization voltage sample with divider resistance by potentiometer.Voltage signal after voltage sampling circuit 102 adopts dividing potential drop reaches amplifier 103.
Amplifier 103 mainly is made of corresponding IC, adopts " voltage follow " pattern that the voltage signal of input is processed, and eliminates interference signal, and the signal of handling well is reached single-chip microcomputer 104.
Single-chip microcomputer 104 is used for that the analog signal that receives is carried out the A/D conversion and forms digital signal, and the signal that employing is obtained carries out discretization.This single-chip microcomputer 104 is by the conversion of the A/D on it mouthful reception analog signal, and it is converted to corresponding digital signal, and this signal is processed, pwm signal obtained, as duty cycle signals, and reach constant-current drive circuit 105 by the I/O mouth on it output.
Constant-current drive circuit 105 passes through the output control signal of the PWM mouth reception single-chip microcomputer on it, and according to signal driver LED(107).
This constant-current drive circuit 105 is mainly realized by the auxiliary simple resistance capacitance of drive IC.For MOSFET drove, peripheral components quantity reduced, and complexity in circuits reduces.
Can realize the PWM brightness adjustment control by the light adjusting circuit that such scheme forms, control rear class LED brightness changes, so that the light modulation precision is higher, brilliance control is more accurate, and the peripheral components consumption still less.
Based on above-mentioned light adjusting circuit, the light-dimming method of LED light compensating lamp provided by the invention comprises the steps:
(1) obtains reference voltage source by the reference voltage module;
(2) cooperate divider resistance that the reference voltage that reference voltage source provides is carried out dividing potential drop by potentiometer, finish sampling;
(3) signal that obtains of sampling is processed through the operational amplification circuit of " voltage follow pattern ", removes interference signal;
(4) signal after the processing, input single-chip microcomputer are finished high-precision A/D conversion, obtain corresponding digital signal;
(5) digital signal that is converted to is processed the digital PWM signal that obtains greater than 200Hz;
(6) the digital PWM signal is adjusted the output duty cycle of constant-current drive circuit, controls LED brightness with this and changes.
Accordingly, to realize accurately controlling the implementation process of LED light compensating lamp brightness as follows in the present invention:
1. voltage sampling circuit carries out timing sampling, and every 20ms once sampling is guaranteed the real-time of brightness adjustment control;
2. sampled signal is carried out A/D and is converted to 8 binary code through single-chip microcomputer;
3. binary code is converted to the numerical value between 0～256, corresponding to 256 grades of brilliance controls, realizes the brightness multi-stage transformation;
3. when carrying out PWM control, setting the output PWM work period is 256 fiducial times, and output frequency is generally more than the 200Hz, to adapt to the requirement of shooting.Interrupt by timer in the present invention, realize the Interruption pattern, determine time reference, and every 40uS triggers 1 interruption.Interrupt temporarily, counter add up and the numerical value of gained and the numerical value after the sample conversion are compared, if " counter values " less than " sample conversion numerical value ", then " I/O mouth " exports high level; Otherwise, output low level then; When counter values greater than 255 the time, the zero clearing counter; Realize thus the duty ratio setting.
As from the foregoing, the dimming mode that this programme provides does not change the drive current of LED, thereby the colour temperature of the light that LED is sent can not exert an influence.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1.LED light compensating lamp light adjusting circuit, described light adjusting circuit comprises voltage sampling circuit, amplifier, it is characterized in that, also comprise reference voltage module, single-chip microcomputer, constant-current drive circuit, the input of described reference voltage module connects power supply, output connects voltage sampling circuit, amplifier and single-chip microcomputer, described voltage sampling circuit output connects amplifier, the output of described amplifier connects single-chip microcomputer, described single-chip microcomputer connects constant-current drive circuit, and described constant-current drive circuit drives and connects LED.
2. LED light compensating lamp light adjusting circuit according to claim 1 is characterized in that described voltage sampling circuit comprises potentiometer and divider resistance.
3.LED the light-dimming method of light compensating lamp is characterized in that, described method comprises the steps:
(1) obtains reference voltage source by the reference voltage module;
(2) cooperate divider resistance that the reference voltage that reference voltage source provides is carried out dividing potential drop by potentiometer, finish sampling;
(3) signal that obtains of sampling is processed the removal interference signal through operational amplification circuit;
(4) signal after the processing, input single-chip microcomputer are finished high-precision A/D conversion, obtain corresponding digital signal;
(5) digital signal that is converted to is processed the digital PWM signal that obtains greater than 200Hz;
(6) the digital PWM signal is adjusted the output duty cycle of constant-current drive circuit, controls LED brightness with this and changes.
4. the light-dimming method of LED light compensating lamp according to claim 1 is characterized in that, operational amplification circuit adopts the mode of operation of voltage follow in the described step (3).
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| CN2012105864985A CN103025031A (en) | 2012-12-28 | 2012-12-28 | Dimming circuit and dimming method for LED light supplementing lamp |
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| CN2012105864985A CN103025031A (en) | 2012-12-28 | 2012-12-28 | Dimming circuit and dimming method for LED light supplementing lamp |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144540A (en) * | 2013-05-10 | 2014-11-12 | 深圳市海洋王照明工程有限公司 | Voltage dimming circuit |
| CN105376892A (en) * | 2015-12-11 | 2016-03-02 | 成都翰道科技有限公司 | Intelligent LED lamp control system based on adjustable constant-current drive circuit |
| CN108259734A (en) * | 2018-04-20 | 2018-07-06 | 杭州联吉技术有限公司 | A kind of network shooting equipment and its light compensating lamp brightness adjusting method |
| CN109379804A (en) * | 2018-10-15 | 2019-02-22 | 广东宝莱特医用科技股份有限公司 | A kind of LED light light adjusting system and light-dimming method |
| CN110177410A (en) * | 2019-05-24 | 2019-08-27 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuit, dimming device and light-dimming method |
| WO2019205818A1 (en) * | 2018-04-28 | 2019-10-31 | 深圳市晟碟半导体有限公司 | Led dimming circuit, dimming apparatus and dimming method for reducing harmonic distortion |
| CN112351549A (en) * | 2020-11-24 | 2021-02-09 | 莱昊(上海)光电科技有限公司 | Device and method for carrying out digital communication with LED lamp through 0-10V dimming interface |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104144540A (en) * | 2013-05-10 | 2014-11-12 | 深圳市海洋王照明工程有限公司 | Voltage dimming circuit |
| CN105376892A (en) * | 2015-12-11 | 2016-03-02 | 成都翰道科技有限公司 | Intelligent LED lamp control system based on adjustable constant-current drive circuit |
| CN108259734A (en) * | 2018-04-20 | 2018-07-06 | 杭州联吉技术有限公司 | A kind of network shooting equipment and its light compensating lamp brightness adjusting method |
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| CN109379804A (en) * | 2018-10-15 | 2019-02-22 | 广东宝莱特医用科技股份有限公司 | A kind of LED light light adjusting system and light-dimming method |
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| CN110177410A (en) * | 2019-05-24 | 2019-08-27 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuit, dimming device and light-dimming method |
| CN112351549A (en) * | 2020-11-24 | 2021-02-09 | 莱昊(上海)光电科技有限公司 | Device and method for carrying out digital communication with LED lamp through 0-10V dimming interface |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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Application publication date: 20130403 |