CN107426879A - A kind of voltage dimming LED (Light Emitting Diode) control system based on PWM - Google Patents
A kind of voltage dimming LED (Light Emitting Diode) control system based on PWM Download PDFInfo
- Publication number
- CN107426879A CN107426879A CN201710766753.7A CN201710766753A CN107426879A CN 107426879 A CN107426879 A CN 107426879A CN 201710766753 A CN201710766753 A CN 201710766753A CN 107426879 A CN107426879 A CN 107426879A
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- led
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- pwm
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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]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention discloses a kind of voltage dimming LED (Light Emitting Diode) control system based on PWM, the LED in the system mainly includes voltage transformation module, PWM generation module and the driver circuit sequentially electrically connected from circuit module.Described LED light modulation principles directly change input voltage values of the LED from circuit for basis first to LED brightness requirement, then it is for the pwm signal of driving switch pipe or the electric current for flowing through LED is stable in respective value to change it after voltage transformation module, so as to change LED brightness.The beneficial effects of the invention are as follows：Relative to existing LED light regulating technologies, the present invention need not set communication module, it is not required that set the peripheral circuit or control chip for producing pwm signal, it is possible to reach the purpose of LED light modulations, while can realize LED current stabilization light modulation.
Description
Technical field
The present invention relates to light regulating technology field, more particularly to a kind of voltage control LED light regulating technologies based on PWM.
Background technology
LED as green high-efficient lighting source its using more and more extensive, and for the dimming function of LED lamp,
It is required that also more and more higher.The conventional dimming mode of LED drive circuit can be divided into two kinds at present：Simulation light modulation and PWM light modulations.This two
Kind of mode is all that LED average current is flowed through by changing to change its brightness, and simulation light modulation can be examined by adjusting electric current
The resistance size of measuring resistance sets LED electric current, or by the brightness adjustment control leads ends of driving chip apply one it is straight
Stream voltage realizes, still, this by that can change its spectrum and colour temperature while the method degree of lightening that adjusts electric current；Pulse
Width modulated is using on-off circuit to seem that LED is always relative to the frequency high-speed switch LED of human eye None- identified, human eye
It is actual flickering luminous, simply human eye None- identified, switching tube ON time and shut-in time in the unit interval
The average current for flowing through LED is determined, also just determines LED brightness, although PWM light modulations can avoid what simulation light modulation ran into
Problem, but the logic circuit that can produce pwm control signal is with outside its needs, it is more relatively complicated.
With the development of electronic technology, the light regulating technology of LED drive circuit is also more and more ripe.Such as Application No.
201610106003.2 disclosure of the invention is a kind of to transmit the light modulation side that PWM signals control LED by power line carrier technology
Method, LED dimmer and LED both ends are added PLC power line communication modems by it respectively, at LED dimmer end, are passed through
After the PWM signal modulations that PLC power line communication modems send light modulator LED end is given by power line transmission
PLC power line communication modems, light modulator is transmitted across by the PLC power line communication modems at LED lamps end
The modulated signal come is transmitted to LED drivings after being demodulated, control the brightness of LED.Such as Application No. 201710172311.x
A kind of compatible voltage light modulation of disclosure of the invention and the LED control device of PWM light modulations, include PWM light modulators access interface, electricity
Pressure 0-10V light modulators access interface and alternating current input interface, controlled PWM switch power modules, the LED sequentially electrically connected
It is electrically connected between the pwm signal input of lamp connecting interface, PWM light modulators access interface and controlled PWM switch power modules
First PWM voltage amplitude adjustment modules, the present apparatus also include the triangular wave generator module sequentially electrically connected, voltage comparator mould
Block and the 2nd PWM voltage amplitude adjustment modules, the pwm signal output end of the 2nd PWM voltage amplitude adjustment modules with it is controlled
The pwm signal input electrical connection of PWM switch power modules.
Either power line carrier technology transmission pwm signal control LED dimming mode or traditional PWM light modulation sides
Formula, it is required for producing the logic circuit of pwm control signal or corresponding communication module, so, its peripheral circuit is relative
It is more complicated, the problem of existing for prior art of the invention, it is proposed that a kind of voltage dimming LED (Light Emitting Diode) control system based on PWM, no
Need communication module and produce the control chip of pwm signal, simplify its peripheral circuit.
The content of the invention
The problem of present invention exists for prior art, it is proposed that a kind of voltage dimming LED (Light Emitting Diode) control system based on PWM,
Efficiently solve needs to set corresponding communication module, and generation PWM control in the prior art between control module and LED light group
The problem of coremaking piece, while LED current stabilization light modulation can be ensured.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of voltage dimming LED (Light Emitting Diode) control system based on PWM, mainly by main circuit module, dc bus and LED from circuit module
Three parts form, it is characterised in that：Described LED from circuit module, wherein, each include sequentially electrically connecting from circuit module
Voltage transformation module, pwm signal generation module, driver circuit and LED light group；Described voltage transformation module includes voltage detecting
With two processes of conversion；Described pwm signal generation module is made up of elements such as operational amplifier, voltage comparator and resistance；
Described driver circuit is DC-DC converter circuit；Described LED light modulation principles are by directly changing LED from the defeated of circuit
Enter magnitude of voltage, then by the setting value for being converted to current stabilization needs of interlock circuit, so as to be used for driving switch to change it
The pwm signal pulsewidth of pipe, it is further that the electric current for flowing through LED is stable in setting value, so as to change LED brightness.
Described voltage transformation module, its function are：The input voltage from circuit is detected by voltage detection module first
Vin, then input voltage is converted into certain conversion relation by modular converter to be adapted to operational amplifier or voltage comparator
In-phase input end input signal Vref。
Described pwm signal generation module, under Fig. 2 control modes, the anti-phase input end signal of operational amplifier is driving
Circuit flows through LED feedback current Io, homophase input end signal is the output valve V of voltage transformation moduleref, operational amplifier
Export the deviation analog quantity of two signals；The inverting input of voltage comparator is electrically connected with triangular-wave generator, homophase input
End signal is the deviation analog quantity of operational amplifier output；The deviation analog quantity acts on triangular signal through voltage comparator
After generate pwm signal.Under Fig. 3 control modes, the homophase input end signal of voltage comparator is the output valve of voltage transformation module
Vref, inverting input is electrically connected with triangular-wave generator.
Described driver circuit by caused pwm signal control described above so as to provided for LED light group stablize it is adjustable
Electric current.
Described Fig. 2 control systems light modulation principle, is changed in PWM generation module by changing from circuit input voltage
The homophase input end signal V of operational amplifierref, the value and the current feedback values I for flowing through LEDo, carried out by operational amplifier
Compare, its deviation analog quantity exported determines the length of the pwm signal ON time of voltage comparator output, so as to flow through
LED current value stability contorting is in corresponding current and sends the light of corresponding bright, and LED electric current dimming mode can be achieved.
Described Fig. 3 control systems light modulation principle, the output valve of voltage transformation module are directly connected on the same of voltage comparator
Phase input, by changing from circuit input voltage, voltage comparator output is then directly affected after voltage transformation module
Pwm signal, driving driver circuit provides for LED and stablizes adjustable electric current, and sends the light of corresponding bright, achievable LED's
PWM dimming modes.
The beneficial effects of the invention are as follows：
Relative to existing LED light regulating technologies, the present invention is adjusted by directly changing LED from the input voltage of circuit to reach LED
The purpose of light, eliminating needs to set corresponding communication module in the prior art between control module and LED light group or need to set
The trouble of the control chip of generation pwm signal is put, while LED current stabilization light modulation can be ensured.
Brief description of the drawings
Fig. 1 is present system schematic diagram；
Fig. 2 is that LED controls internal structure schematic diagram from circuit current stabilization；
Fig. 3 is that LED dims internal structure schematic diagram from circuit PWM；
Fig. 4 is that pwm signal generates schematic diagram；
Fig. 5 is that LED PWM controls bright dark procedural block diagram；
Fig. 6 is Closed-loop Constant-current control process block diagram.
Embodiment
Below in conjunction with the accompanying drawings and example is described in further detail to the present invention：
Fig. 1 is the overall schematic of present system, mainly by main circuit module 10, dc bus 11 and LED from circuit module 1
~ n three parts form, described LED from circuit module, wherein, each include the voltage conversion that sequentially electrically connects from circuit module
Module 22, pwm signal generation module 20, driver circuit 21 and LED light group；Described LED light modulation principles are by directly changing
Input voltage value Vs of the LED from circuitinTo change it for driving the pwm signal 205 of the switching tube of driver circuit 21 or will flow through
LED electric current is stable in respective value, so as to change LED brightness.
Fig. 2 be LED from circuit current stabilization control internal structure schematic diagram, including sequentially electrically connect voltage transformation module 22,
Pwm signal generation module 20, driver circuit 21 and LED light group, the voltage transformation module include voltage detecting 221 and conversion
222 two processes；The pwm signal generation module 20 is by for comparing feedback current IoWith the output valve of voltage transformation module
VrefOperational amplifier device 202 and for the deviation analog quantity 203 of triangular wave 204 and operational amplifier output terminal to be compared
Formed compared with elements such as the voltage comparators 201 and resistance for producing pwm signal 205；Described driver circuit 21 is DC-DC converter
Circuit.
Fig. 3 be LED from circuit PWM control internal structure schematic diagram, including sequentially electrically connect voltage transformation module 22,
Pwm signal generation module 20, driver circuit 21 and LED light group, unlike control mode circuit shown in Fig. 2, the PWM letters
Number generation module 20 compared with the output valve of voltage transformation module 22 by triangular wave 204 mainly by for producing pwm signal 205
Voltage comparator 201 and the element such as resistance form.
Fig. 4 is the waveform diagram that triangular signal produces pwm signal compared with analog quantity is by voltage comparator, is such as schemed
It is shown, low level signal is exported when triangular signal 204 is higher than analog quantity, it is defeated when triangular signal 204 is less than analog quantity
Go out high level signal, it is found that when triangular signal keeps constant, analog value gets over leading for the pwm signal 205 of height output
The logical time is longer.
Fig. 5 is that LED PWM controls bright dark process schematic, the control circuit shown in FB(flow block) in figure and Fig. 3：
If raise VinValue, then the in-phase input end V of the voltage comparator 201 obtained by voltage transformation module 22refValue increase, the mould
The ON time for the pwm signal 205 that analog quantity value obtains after being acted on fixed triangular signal 204 by voltage comparator increases
Greatly, the current value I for flowing through LED is madeoIncrease, LED luminance improve, similarly, if reducing VinValue, then obtained by voltage transformation module 22
To the in-phase input end V of voltage comparatorrefValue reduces, the analog value and fixed triangular signal 204 by voltage ratio compared with
The ON time of the pwm signal 205 obtained after device effect reduces, and makes the current value I for flowing through LEDoReduce, LED luminance reduces, i.e.,
Complete LED PWM control dimming process.
Fig. 6 is Closed-loop Constant-current control process block diagram representation, the control circuit shown in FB(flow block) in figure and Fig. 2：
First by changing the input voltage value from circuit, exported by voltage transformation module 22 by the in-phase input end of operational amplifier
Signal is fixed on corresponding current threshold, if then flowing through LED current value IoIncrease, then pass through operational amplifier 202 and threshold
Value electric current is compared, and the deviation analog quantity 203 of output reduces, and the deviation analog quantity passes through with fixed triangular signal 204
The ON time for the pwm signal 205 that voltage comparator 201 obtains after acting on reduces, i.e. the switching tube ON time of driver circuit
Reduce, flow through LED current value IoReduce, correspondingly, if current value IoReduce, the deviation analog quantity that operational amplifier 202 exports
203 increases, the ON time of pwm signal 205 increase, and flow through LED current value IoIncrease, so as to which LED current value will be flowed through
Stabilization is in corresponding threshold value and sends corresponding brightness, forms the control of LED Closed-loop Constant-currents, that is, the current stabilization for completing LED controls light modulation
Process.
Then the present invention changes driving by directly changing LED from circuit input voltage value by corresponding control circuit
The pwm signal pulsewidth of circuit, LED electric current value stabilization will be flowed through in setting value, so as to change its brightness, relative to prior art
Communication module between peripheral control circuits and LED light group need not be set, it is not required that set generation the outer of pwm signal to contain
Coremaking piece circuit, while LED current stabilization control can be ensured.
Claims (7)
- A kind of 1. voltage dimming LED (Light Emitting Diode) control system based on PWM, mainly by main circuit module（10）, dc bus（11）And LED From circuit module（1~n）Three parts form, it is characterised in that：Described LED is from circuit module（1~n）, wherein, each from circuit Module includes the voltage transformation module sequentially electrically connected（22）, pwm signal generation module（20）, driver circuit（21）And LED Group；Described voltage transformation module（22）Including voltage detecting（221）And conversion（222）Two processes；Described pwm signal life Into module（20）By operational amplifier（201）, voltage comparator（202）And the element such as resistance is formed；Described driver circuit （21）For DC-DC converter circuit；Described LED light modulation principles are by directly changing input voltage values of the LED from circuit, so It is used for the pwm signal of driving switch pipe or stablizes the electric current for flowing through LED to exist to change it by the conversion of interlock circuit afterwards In respective value, so as to change LED brightness.
- A kind of 2. voltage dimming LED (Light Emitting Diode) control system based on PWM according to claim 1, it is characterised in that：Described electricity Press modular converter（22）, its function is：Pass through voltage detection module first（221）Detect the input voltage V from circuitin, then Pass through modular converter（222）Input voltage is converted into by suitable operational amplifier with certain conversion relation（202）Or voltage ratio Compared with device（201）In-phase input end input signal Vref。
- A kind of 3. voltage dimming LED (Light Emitting Diode) control system based on PWM according to claim 1, it is characterised in that：Described Pwm signal generation module（20）, under Fig. 2 control modes, operational amplifier（202）Anti-phase input end signal be driver circuit （21）Flow through LED feedback current Io, homophase input end signal is voltage transformation module（22）Output valve Vref, computing puts Big device（202）Export the deviation analog quantity of two signals（203）；Voltage comparator（201）Inverting input be electrically connected with three Angle wave producer, homophase input end signal are operational amplifier（202）The deviation analog quantity of output（203）；The deviation simulation Amount（203）With triangular signal（204）Through voltage comparator（201）Pwm signal is generated after effect（205）.
- 4. under Fig. 3 control modes, voltage comparator（201）Homophase input end signal be voltage transformation module（22）Output valve Vref, inverting input is electrically connected with triangular-wave generator.
- A kind of 5. voltage dimming LED (Light Emitting Diode) control system based on PWM according to claim 1, it is characterised in that：Described drive Moving-wire road（21）By caused pwm signal described above（205）Control stablizes adjustable electric current so as to be provided for LED light group.
- A kind of 6. voltage dimming LED (Light Emitting Diode) control system based on PWM according to claim 1,3, it is characterised in that：Described Fig. 2 control systems dim principle, change PWM generation module by changing from circuit input voltage（20）Middle operational amplifier （202）Homophase input end signal Vref, the value and the current feedback values I for flowing through LEDoPass through operational amplifier（202）Compared Compared with its deviation analog quantity exported（203）Decide voltage comparator（201）The length of the ON time of output pwm signal, from And the current value stability contorting for flowing through LED in corresponding current and is sent into the light of corresponding bright, LED electric current light modulation can be achieved Mode.
- A kind of 7. voltage dimming LED (Light Emitting Diode) control system based on PWM according to claim 1,3, it is characterised in that：Described Fig. 3 control systems dim principle, voltage transformation module（20）Output valve be directly connected on voltage comparator（201）Homophase input End, by changing from circuit input voltage, voltage comparator is then directly affected after voltage transformation module（201）Output Pwm signal, driving driver circuit provides for LED stablizes adjustable electric current, and sends the light of corresponding bright, and LED PWM can be achieved Dimming mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710766753.7A CN107426879B (en) | 2017-08-31 | 2017-08-31 | Voltage dimming LED control system based on PWM |
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| CN201710766753.7A CN107426879B (en) | 2017-08-31 | 2017-08-31 | Voltage dimming LED control system based on PWM |
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| CN107426879B CN107426879B (en) | 2020-09-15 |
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Cited By (4)
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| WO2019113996A1 (en) * | 2017-12-15 | 2019-06-20 | 上海昭关照明实业有限公司 | Starting method and apparatus for lighting device, and led light assembly |
| CN110047436A (en) * | 2019-06-06 | 2019-07-23 | 京东方科技集团股份有限公司 | Pixel circuit, array substrate, its driving method, display panel and display device |
| CN111836432A (en) * | 2019-03-27 | 2020-10-27 | 辉芒微电子（深圳）有限公司 | Linear constant-current driving circuit, chip and method for PWM dimming |
| CN117395831A (en) * | 2023-10-30 | 2024-01-12 | 中国科学院长春光学精密机械与物理研究所 | LED driving dimming circuit and control method |
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Denomination of invention: A voltage dimming LED control system based on PWM Effective date of registration: 20211216 Granted publication date: 20200915 Pledgee: Yantai financing guarantee Group Co.,Ltd. Pledgor: LUDONG University Registration number: Y2021980015152 |
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Effective date of registration: 20220913 Address after: No. 102 Zhenshan Road, Zhifu District, Yantai City, Shandong Province 264200 Patentee after: Yantai Shuangqi Electronic Technology Co.,Ltd. Address before: 264025 Ludong University, 186 Hongqi Middle Road, Zhifu District, Shandong, Yantai Patentee before: LUDONG University |