CN104780644B - A kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power - Google Patents
A kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power Download PDFInfo
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- CN104780644B CN104780644B CN201410015769.0A CN201410015769A CN104780644B CN 104780644 B CN104780644 B CN 104780644B CN 201410015769 A CN201410015769 A CN 201410015769A CN 104780644 B CN104780644 B CN 104780644B
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Abstract
The present invention devises a kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power, and its feature is：（1）Current regulator is used based on conditioning technology integration limitation saturation（Anti‑windup）Algorithm realizes current constant control, and voltage control loop realizes voltage stabilizing control using one-cycle control.（2）Two control loops control the conducting and shut-off of transformer primary side switching tube by the pwm signal of "AND" logic unit output adjustable duty cycle.By "AND" logic module, there is the relation of a kind of " interlocking " with voltage control loop in current controlled circuit.Constant current output is realized by current regulator; voltage stabilizing function is realized by the effect of voltage control loop; and when output current is too high; pass through this " interlocking " relation; voltage control loop can be by limiting voltage in a stable maximum voltage value; and then the amplification of output current is limited, protect LED load.（3）PWM light modulation links are added in the input of "AND" logic module, realize that PWM is dimmed.
Description
Technical field
The present invention relates to a kind of LED drive power, belongs to electronic technology field especially high frequency switch power field.
Background technology
LED light source has the advantages that efficient, long lifespan, safe and environment-friendly energy-conservation and colour gamut are wide, is widely used in household photograph
The lighting field such as bright, road lighting and vehicle-mounted illumination, progressively turn into the lighting source of future generation of substitution conventional light source.Due to
LED light source is a kind of nonlinear load and it is more sensitive to operating ambient temperature, by the way of typically being driven using constant current.It is permanent
Curent change caused by stream driving can eliminate forward voltage change caused by system temperature and artificial lamp factor, ensures LED light
The brightness in source and the uniformity of colourity, and the service life of LED light source can be extended well, therefore LED drive power is general
It is required that higher constant current accuracy.
Traditional LED drive power is typically simply easy to using the PI controls based on voltage current negative feedback, this circuit
Realize, but dynamic response is slow, stable state accuracy is low, Ability of Resisting Disturbance is weak.
The content of the invention
Typically controlled present invention is generally directed to traditional LED drive power using the PI based on voltage current negative feedback, this
Kind circuit is simply easily achieved, but dynamic response is slow, stable state accuracy is low, Ability of Resisting Disturbance is weak, and it is steady to design a kind of Novel constant-flow
Press inverse-excitation type LED drive power.
Based on the constant-current controller of conditioning technology Anti-windup algorithms, using conditioning technology Anti-
Windup algorithms realize feedback control to the output current signal sampled and reach the purpose of constant current.
Voltage-stabilizing controller based on one-cycle control is believed the output voltage sampled using one-cycle control
Number carry out feedback control reach voltage stabilizing purpose.
The PWM duty cycle of output end output current can be adjusted by adding PWM light-adjusting modules, realize a kind of pulse current PWM
Light modulation.
"AND" logic module is added, by the constant-current controller based on conditioning technology Anti-windup algorithms, based on list
Voltage-stabilizing controller, the pwm signal of PWM light-adjusting modules output of periodic Control technology export a warp as its input signal
The pwm signal crossed after logic "and" operation, and this pwm signal is transported to power switch pipe, control leading for power switch pipe
Logical and shut-off, realizes conversion of the energy from primary side to secondary side in flyback sourse converter unit.
The beneficial effects of the invention are as follows：
（1）Current regulator is used based on conditioning technology integration limitation saturation（Anti-windup）Algorithm is realized permanent
Flow control, voltage control loop realize voltage stabilizing control using one-cycle control.
（2）Two control loops control transformer one by the pwm signal of "AND" logic unit output adjustable duty cycle
The conducting and shut-off of secondary side switching tube.By "AND" logic module, current controlled circuit exists a kind of " mutual with voltage control loop
The relation of lock ".Constant current output is realized by current regulator, voltage stabilizing function is realized by the effect of voltage control loop, and
When output current is too high, by this " interlocking " relation, voltage control loop can be by limiting voltage in a stable highest electricity
Pressure value, and then the amplification of output current is limited, protect LED load.
（3）PWM light modulation links are added in the input of "AND" logic module, realize that PWM is dimmed.
Brief description of the drawings
Fig. 1 is LED drive power overall structure block diagram.
Fig. 2 is LED main circuit diagrams.
Fig. 3 is the voltage-stabilizing controller schematic diagram based on one-cycle control.
Fig. 4 is the constant-current controller schematic diagram based on conditioning technology Anti-windup algorithms.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, circuit of the present invention includes：Exchange input rectifying filter unit, flyback sourse converter unit, defeated
Go out rectification filtering unit, voltage/current sampling unit, the constant-current controller based on conditioning technology Anti-windup algorithms,
Voltage-stabilizing controller based on one-cycle control, PWM light-adjusting modules, "AND" logic module；The exchange input rectifying filtering
Unit, flyback sourse converter unit, output rectification filter unit, voltage/current feedback sample unit form this LED drive power
Main circuit part；The constant-current controller based on conditioning technology Anti-windup algorithms, based on one circle control skill
Voltage-stabilizing controller, the PWM light-adjusting modules of art, "AND" logic module form the peripheral control circuits of this LED drive power；Exchange defeated
Enter rectification filtering unit electric main be converted into DC pulse voltage to be input to flyback sourse converter unit；The flyback sourse
Converter unit includes RCD buffer circuits, high frequency transformer, power switch pipe, the high frequency transformer one when power switch pipe turns off
Electrical power storage is got up in secondary side, and electric energy is delivered to secondary side i.e. output end by high frequency transformer when switching tube turns on；The voltage/
Current sampling unit is responsible for the voltage and current signal of sampled output and respectively by voltage sampling signal and current sampling signal
It is sent to the voltage-stabilizing controller based on one-cycle control and the constant current control based on conditioning technology Anti-windup algorithms
The input of device processed, wherein voltage sampling unit realize that current sampling unit uses Hall current sensor using potential-divider network
Realize；The constant-current controller based on conditioning technology Anti-windup algorithms, using conditioning technology Anti-
Windup algorithms realize feedback control to the output current signal sampled and reach the purpose of constant current；It is described to be controlled based on the monocycle
The voltage-stabilizing controller of technology processed carries out feedback control to the output voltage signal sampled using one-cycle control and reaches steady
Press purpose；The PWM light-adjusting modules can adjust the PWM duty cycle of output end output current, realize that a kind of pulse current PWM is adjusted
Light；The "AND" logic module, by the constant-current controller based on conditioning technology Anti-windup algorithms, based on the monocycle
Voltage-stabilizing controller, the pwm signal of PWM light-adjusting modules output of control technology export a process and patrolled as its input signal
Pwm signal after volume AND operation, and this pwm signal is transported to power switch pipe, control the conducting of power switch pipe with
Shut-off, realizes conversion of the energy from primary side to secondary side in flyback sourse converter unit.
As shown in Fig. 2 main circuit structure is by rectifier bridge, inverse-excitation converting circuit（Flyback）, output rectifier and filter,
Voltage x current sample circuit forms.C2For input filter capacitor, resistance R1, diode D2A simple buffer circuit is formed, is become
Depressor T1With switching tube Q1Form inverse-excitation converting circuit.If switching tube Q1Dutycycle be, switch periods TS, during switch conduction
Between be Ton, turn-off time Toff, input current i1, transformer turn ratio N1:N2, output average voltage is Vo, switching tube
Q1By PWM cycle break-make, in Q1The T of conductingoff=DTSPeriod, power supply pass through bridge rectifier module DG1Voltage V afterwardsSIt is added to winding
N1, electric currenti 1Ramp, N1Magnetic flux increase, inductive energy storage increase, diode D1Reversely cut-off, load LED current is by electric capacity
There is provided；In Q1The T of shut-offoff=（1-D）TSPeriod, N1Pass through sustained diode2Afterflow, at the same transmit its energy to secondary side around
Group N2, secondary side winding electric current i2Reduce with magnetic flux Φ since maximum, D1Conducting, so as to which the magnetic energy of transformer be converted to
Electric energy powers to the load.R’ 1And R’ 2It is V that the potential-divider network of composition, which forms output average voltage,oSample circuit, pass through partial pressure net
Network R’ 3And R’ 4Sample RiOn current potential can obtain output current IoCorresponding electric potential signal.
As shown in figure 3, it is the voltage-stabilizing controller schematic diagram based on one-cycle control.According to the single-revolution of anti exciting converter
Phase governing equation group：
Compare u1And u (t)2(t), you can dutycycle D is determined, by formula（1）Understand, one circle control link needs a product
Divide link, as long as passing through circuit realiration u1And u (t)2(t) comparison, you can determine transient state dutycycle d and its average value d’。u1
(t) it is a triangular wave, the integrator with reset switch that it is formed by error amplifier obtains, u2(t) examined by electric current
Survey end input signal to obtain by computing, afterwards by u1And u (t)2(t) high-speed comparator is accessed.
As shown in figure 4, it is the constant-current controller schematic diagram based on conditioning technology Anti-windup algorithms.
The output state of integrator is：
According to formula（2）When integrator unsaturation, i.e.,u n =u s , the output of integratorq=k p e/t, now constant-current controller
For common PI controllers, output current IoGiven electric current I is followed by PI control lawsref；When integrator saturation,u n ＞u s ,
The output of integratorqDecline, integrator is exited saturation, maintain the linear continuum of constant-current controller output, make Io=Iref, carry
The dynamic property of high system and the stable state accuracy of output current.
As shown in figure 4, the PWM letters of the constant-current controller output based on conditioning technology Anti-windup control algolithms
Number pass through "AND" logic with the pwm signal and the pwm signals of PWM light modulators of the voltage-stabilizing controller output based on one circle control
Module exports the shut-off of a pwm signal controlling switch pipe.
Claims (1)
1. a kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power, its feature include, exchange input rectifying filter unit, flyback
Power conversion unit, output rectification filter unit, voltage/current sampling unit, based on conditioning technology Anti-windup calculate
The constant-current controller of method, the voltage-stabilizing controller based on one-cycle control, PWM light-adjusting modules, "AND" logic module；The friendship
Flow input rectifying filter unit, flyback sourse converter unit, output rectification filter unit, voltage/current sampling unit composition originally
The main circuit part of LED drive power；The constant-current controller based on conditioning technology Anti-windup algorithms, it is based on
The voltage-stabilizing controller of one-cycle control, PWM light-adjusting modules, "AND" logic module form the outer of this LED drive power and contained
Circuit processed；Electric main is converted to DC pulse voltage and is input to flyback sourse conversion list by exchange input rectifying filter unit
Member；The flyback sourse converter unit includes RCD buffer circuits, high frequency transformer, power switch pipe, when power switch pipe turns off
When high frequency transformer primary side electrical power storage is got up, it is i.e. defeated to be delivered to secondary side by high frequency transformer for electric energy when switching tube turns on
Go out end；The voltage/current sampling unit is responsible for the voltage and current signal of sampled output and respectively by voltage sampling signal
Voltage-stabilizing controller based on one-cycle control is sent to current sampling signal and based on conditioning technology Anti-
The input of the constant-current controller of windup algorithms, wherein voltage sampling unit are using potential-divider network realization, current sampling unit
Realized using Hall current sensor；The constant-current controller based on conditioning technology Anti-windup algorithms, using bar
Part working technology Anti-windup algorithms realize feedback control to the output current signal sampled and reach the purpose of constant current；
The voltage-stabilizing controller based on one-cycle control is entered using one-cycle control to the output voltage signal sampled
Row feedback control reaches voltage stabilizing purpose；The PWM light-adjusting modules can adjust the PWM duty cycle of output end output current, realize
A kind of pulse current PWM light modulations；The "AND" logic module, by the constant current based on conditioning technology Anti-windup algorithms
Controller, the voltage-stabilizing controller based on one-cycle control, the pwm signal of PWM light-adjusting modules output as its input signal,
And a pwm signal after logic "and" operation is exported, and this pwm signal is transported to power switch pipe, control work(
The conducting and shut-off of rate switching tube, realize conversion of the energy from primary side to secondary side in flyback sourse converter unit.
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| CN201410015769.0A CN104780644B (en) | 2014-01-14 | 2014-01-14 | A kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power |
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| CN201410015769.0A CN104780644B (en) | 2014-01-14 | 2014-01-14 | A kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power |
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| CN104780644A CN104780644A (en) | 2015-07-15 |
| CN104780644B true CN104780644B (en) | 2017-12-26 |
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| CN106875794B (en) * | 2017-03-29 | 2023-04-18 | 敏业信息科技（上海）有限公司 | Teaching power consumption fast pulse burst immunity experimental device |
| CN111818701A (en) * | 2020-07-30 | 2020-10-23 | 浙江欧易新能源有限公司 | Dimmable high-power LED driving power supply |
| CN114460883B (en) * | 2022-02-11 | 2024-03-15 | 深圳华创芯光科技有限公司 | OCC driver with voltage dynamically controllable adjustment based on double-loop control |
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| CN102202450A (en) * | 2011-07-11 | 2011-09-28 | 江南大学 | Light-adjustable high-power LED driving power supply |
| CN202738205U (en) * | 2012-08-08 | 2013-02-13 | 深圳民爆光电技术有限公司 | LED dimming drive circuit |
| CN103442480A (en) * | 2013-08-02 | 2013-12-11 | 江南大学 | Novel intelligent high-precision LED driving power source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130015213A (en) * | 2011-08-02 | 2013-02-13 | 삼성전자주식회사 | Control device for controlling led driving circuit and led driving circuit comprising the control device and methods thereof |
| KR101357727B1 (en) * | 2011-09-08 | 2014-02-06 | 주식회사 동부하이텍 | Isolation-type flyback converter for light emitting diode driver |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202450A (en) * | 2011-07-11 | 2011-09-28 | 江南大学 | Light-adjustable high-power LED driving power supply |
| CN202738205U (en) * | 2012-08-08 | 2013-02-13 | 深圳民爆光电技术有限公司 | LED dimming drive circuit |
| CN103442480A (en) * | 2013-08-02 | 2013-12-11 | 江南大学 | Novel intelligent high-precision LED driving power source |
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| 一种新型的高性能LED驱动电源设计;周园等;《电源技术》;20120531;第36卷(第5期);第729-731页 * |
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Effective date of registration: 20210720 Address after: 523460 No.3, xiaotiantou 1st Road, Xinsi village, Hengli Town, Dongguan City, Guangdong Province Patentee after: LETARON ELECTRONIC Co.,Ltd. Address before: Lihu Avenue Binhu District 214122 Jiangsu city of Wuxi province Jiangnan University No. 1800 Patentee before: Jiangnan University |
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Address after: No. 253, Hengli Junma Road, Hengli Town, Dongguan, Guangdong 523460 Patentee after: Guangdong Qingzhou Photoelectric Technology Co.,Ltd. Address before: 523460 No.3, xiaotiantou 1st Road, Xinsi village, Hengli Town, Dongguan City, Guangdong Province Patentee before: LETARON ELECTRONIC CO.,LTD. |