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 PDF

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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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沈艳霞
李帆
张君继
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Guangdong Qingzhou Photoelectric Technology Co ltd
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Jiangnan University
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Abstract

本发明设计了一种新型恒流稳压反激式LED驱动电源,其特点为:(1)电流控制环采用基于条件作用技术积分限制饱和(Anti‑windup)算法实现恒流控制,电压控制环采用单周期控制技术实现稳压控制。(2)两个控制环路通过“与”逻辑单元输出可调占空比的PWM信号来控制变压器一次侧开关管的导通与关断。通过“与”逻辑模块,电流控制环路与电压控制环路存在一种“互锁”的关系。通过电流控制环实现了恒流输出,通过电压控制环的作用实现稳压功能,并且当输出电流过高时,通过这种“互锁”关系,电压控制环会将电压限定在一个稳定的最高电压值,进而限定输出电流的增幅,保护了LED负载。(3)在“与”逻辑模块的输入端再加入PWM调光环节,实现PWM调光。

The present invention designs a new constant-current regulated flyback LED drive power supply, which features: (1) The current control loop adopts the integral limit saturation (Anti‑windup) algorithm based on conditional action technology to realize constant current control, and the voltage control loop Single-cycle control technology is used to realize voltage regulation control. (2) The two control loops output the PWM signal with adjustable duty ratio through the "AND" logic unit to control the turn-on and turn-off of the switch tube on the primary side of the transformer. Through the "AND" logic module, there is an "interlock" relationship between the current control loop and the voltage control loop. The constant current output is realized through the current control loop, the voltage regulation function is realized through the function of the voltage control loop, and when the output current is too high, through this "interlock" relationship, the voltage control loop will limit the voltage to a stable maximum The voltage value, thereby limiting the increase of the output current, protects the LED load. (3) A PWM dimming link is added to the input end of the "AND" logic module to realize PWM dimming.

Description

一种新型恒流稳压反激式LED驱动电源A new constant current regulated flyback LED drive power supply

技术领域technical field

本发明涉及了一种LED驱动电源,属于电子技术领域尤其是高频开关电源领域。The invention relates to an LED driving power supply, which belongs to the field of electronic technology, especially the field of high-frequency switching power supply.

背景技术Background technique

LED光源具有高效、寿命长、安全、环保节能以及色域宽等优点,广泛应用于家居照明、道路照明以及车载照明等照明领域,逐步成为取代传统光源的下一代照明光源。由于LED光源是一种非线性负载而且其对工作环境温度比较敏感,一般采用恒流驱动的方式。恒流驱动可以消除系统温度和工艺灯因素引起的正向电压变化导致的电流变化,保证LED光源的亮度和色度的一致性,并能够很好地延长LED光源的使用寿命,因此LED驱动电源一般要求较高的恒流精度。LED light sources have the advantages of high efficiency, long life, safety, environmental protection and energy saving, and wide color gamut. They are widely used in lighting fields such as home lighting, road lighting, and vehicle lighting, and gradually become the next-generation lighting source to replace traditional light sources. Since the LED light source is a nonlinear load and it is sensitive to the temperature of the working environment, a constant current drive method is generally used. The constant current drive can eliminate the current change caused by the forward voltage change caused by the system temperature and process lamp factors, ensure the consistency of the brightness and chromaticity of the LED light source, and can prolong the service life of the LED light source, so the LED drive power supply Generally higher constant current accuracy is required.

传统的LED驱动电源一般采用基于电压电流负反馈的PI控制,这种电路简单易于实现,但是动态响应慢、稳态精度低、抗扰动能力弱。Traditional LED drive power generally adopts PI control based on voltage and current negative feedback. This circuit is simple and easy to implement, but has slow dynamic response, low steady-state accuracy, and weak anti-disturbance ability.

发明内容Contents of the invention

本发明主要针对传统的LED驱动电源一般采用基于电压电流负反馈的PI控制,这种电路简单易于实现,但是动态响应慢、稳态精度低、抗扰动能力弱,设计一种新型恒流稳压反激式LED驱动电源。The present invention mainly aims at the traditional LED driving power generally using PI control based on voltage and current negative feedback. This kind of circuit is simple and easy to implement, but has slow dynamic response, low steady-state precision and weak anti-disturbance ability. A new type of constant current voltage regulator is designed. Flyback LED driver power supply.

基于条件作用技术Anti-windup算法的恒流控制器,采用条件作用技术Anti-windup算法对采样到的输出电流信号实现反馈控制并达到恒流的目的。The constant current controller based on the anti-windup algorithm of the conditional action technology adopts the anti-windup algorithm of the conditional action technology to realize feedback control on the sampled output current signal and achieve the purpose of constant current.

基于单周期控制技术的稳压控制器采用单周期控制技术对采样到的输出电压信号进行反馈控制达到稳压目的。The voltage stabilizing controller based on single-cycle control technology uses single-cycle control technology to perform feedback control on the sampled output voltage signal to achieve the purpose of voltage stabilization.

加入PWM调光模块能够调节输出端输出电流的PWM占空比,实现一种脉冲电流PWM调光。Adding a PWM dimming module can adjust the PWM duty cycle of the output current at the output terminal, and realize a pulse current PWM dimming.

加入“与”逻辑模块,将基于条件作用技术Anti-windup算法的恒流控制器、基于单周期控制技术的稳压控制器、PWM调光模块输出的PWM信号作为其输入信号,并输出一个经过逻辑“与”运算后的PWM信号,并将这个PWM信号输送到功率开关管,控制功率开关管的导通与关断,实现反激电源变换单元中能量从一次侧到二次侧的转换。Add the "AND" logic module, take the constant current controller based on the conditional technology Anti-windup algorithm, the voltage regulator controller based on the single cycle control technology, and the PWM signal output by the PWM dimming module as its input signal, and output a The PWM signal after the logic "AND" operation is sent to the power switch tube to control the on and off of the power switch tube to realize the conversion of energy from the primary side to the secondary side in the flyback power conversion unit.

本发明的有益效果是:The beneficial effects of the present invention are:

(1)电流控制环采用基于条件作用技术积分限制饱和(Anti-windup)算法实现恒流控制, 电压控制环采用单周期控制技术实现稳压控制。(1) The current control loop adopts the anti-windup algorithm based on conditional action technology to realize constant current control, and the voltage control loop adopts single-cycle control technology to realize voltage stabilization control.

(2)两个控制环路通过“与”逻辑单元输出可调占空比的PWM信号来控制变压器一次侧开关管的导通与关断。通过“与”逻辑模块,电流控制环路与电压控制环路存在一种“互锁”的关系。通过电流控制环实现了恒流输出,通过电压控制环的作用实现稳压功能,并且当输出电流过高时,通过这种“互锁”关系,电压控制环会将电压限定在一个稳定的最高电压值,进而限定输出电流的增幅,保护了LED负载。(2) The two control loops output the PWM signal with adjustable duty ratio through the "AND" logic unit to control the turn-on and turn-off of the switch tube on the primary side of the transformer. Through the "AND" logic module, there is an "interlock" relationship between the current control loop and the voltage control loop. The constant current output is realized through the current control loop, the voltage regulation function is realized through the function of the voltage control loop, and when the output current is too high, through this "interlock" relationship, the voltage control loop will limit the voltage to a stable maximum The voltage value, thereby limiting the increase of the output current, protects the LED load.

(3)在“与”逻辑模块的输入端再加入PWM调光环节,实现PWM调光。(3) A PWM dimming link is added to the input end of the "AND" logic module to realize PWM dimming.

附图说明Description of drawings

图1为LED驱动电源整体结构框图。Figure 1 is a block diagram of the overall structure of the LED drive power supply.

图2为LED主电路图。Figure 2 is the LED main circuit diagram.

图3为基于单周期控制技术的稳压控制器原理图。Figure 3 is a schematic diagram of a voltage regulator controller based on single-cycle control technology.

图4为基于条件作用技术Anti-windup算法的恒流控制器原理图。Figure 4 is a schematic diagram of a constant current controller based on the conditional technology Anti-windup algorithm.

具体实施方式detailed description

下面结合附图对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.

如图1所示,本发明所述电路包括:交流输入整流滤波单元、反激电源变换单元、输出整流滤波单元、电压/电流采样单元、基于条件作用技术Anti-windup算法的恒流控制器、基于单周期控制技术的稳压控制器、PWM调光模块,“与”逻辑模块;所述交流输入整流滤波单元、反激电源变换单元、输出整流滤波单元、电压/电流反馈采样单元组成本LED驱动电源的主电路部分;所述基于条件作用技术Anti-windup算法的恒流控制器、基于单周期控制技术的稳压控制器、PWM调光模块,“与”逻辑模块组成本LED驱动电源的外围控制电路;交流输入整流滤波单元将交流市电转换为直流脉冲电压输入到反激电源变换单元;所述反激电源变换单元包括RCD缓冲电路、高频变压器、功率开关管,当功率开关管关断时高频变压器一次侧将电能储存起来,开关管导通时高频变压器将电能传递到二次侧即输出端;所述电压/电流采样单元负责采样输出端的电压和电流信号并分别将电压采样信号和电流采样信号发送到基于单周期控制技术的稳压控制器和基于条件作用技术Anti-windup算法的恒流控制器的输入端,其中电压采样单元采用分压网络实现,电流采样单元采用霍尔电流传感器实现;所述基于条件作用技术Anti-windup算法的恒流控制器,采用条件作用技术Anti-windup算法对采样到的输出电流信号实现反馈控制并达到恒流的目的;所述基于单周期控制技术的稳压控制器采用单周期控制技术对采样到的输出电压信号进行反馈控制达到稳压目的;所述PWM调光模块能够调节输出端输出电流的PWM占空比,实现一种脉冲电流PWM调光;所述“与”逻辑模块,将基于条件作用技术Anti-windup算法的恒流控制器、基于单周期控制技术的稳压控制器、PWM调光模块输出的PWM信号作为其输入信号,并输出一个经过逻辑“与”运算后的PWM信号,并将这个PWM信号输送到功率开关管,控制功率开关管的导通与关断,实现反激电源变换单元中能量从一次侧到二次侧的转换。As shown in Figure 1, the circuit of the present invention includes: an AC input rectification filter unit, a flyback power conversion unit, an output rectification filter unit, a voltage/current sampling unit, a constant current controller based on the conditional technology Anti-windup algorithm, Voltage regulator controller, PWM dimming module, and logic module based on single-cycle control technology; the AC input rectification and filtering unit, flyback power conversion unit, output rectification and filtering unit, and voltage/current feedback sampling unit form the LED The main circuit part of the drive power supply; the constant current controller based on the conditional technology Anti-windup algorithm, the voltage regulator controller based on the single-cycle control technology, the PWM dimming module, and the "AND" logic module form the LED drive power supply. Peripheral control circuit; the AC input rectification and filtering unit converts AC mains power into DC pulse voltage and inputs it to the flyback power conversion unit; the flyback power conversion unit includes an RCD buffer circuit, a high-frequency transformer, and a power switch tube. When the high-frequency transformer is turned off, the primary side of the high-frequency transformer stores the electric energy, and when the switch tube is turned on, the high-frequency transformer transfers the electric energy to the secondary side, that is, the output terminal; the voltage/current sampling unit is responsible for sampling the voltage and current signals of the output terminal and respectively The voltage sampling signal and current sampling signal are sent to the input terminals of the voltage stabilizing controller based on single-cycle control technology and the constant current controller based on conditional technology Anti-windup algorithm, in which the voltage sampling unit is realized by a voltage divider network, and the current sampling unit It is realized by using a Hall current sensor; the constant current controller based on the conditional technology Anti-windup algorithm adopts the conditional technology Anti-windup algorithm to realize feedback control of the sampled output current signal and achieve the purpose of constant current; the described The voltage stabilizing controller based on single-cycle control technology uses single-cycle control technology to perform feedback control on the sampled output voltage signal to achieve the purpose of voltage stabilization; the PWM dimming module can adjust the PWM duty cycle of the output current at the output terminal to achieve a A pulse current PWM dimming; the "AND" logic module uses the constant current controller based on the conditional technology Anti-windup algorithm, the voltage regulator controller based on single-cycle control technology, and the PWM signal output by the PWM dimming module as It inputs a signal and outputs a PWM signal after a logic "AND" operation, and sends this PWM signal to the power switch tube to control the on and off of the power switch tube, so as to realize the energy in the flyback power conversion unit from the primary side to secondary side conversion.

如图2所示,主电路结构由整流桥、反激变换电路(Flyback)、输出整流滤波电路、电压电流采样电路组成。C2为输入滤波电容,电阻R1、二极管D2组成一个简单的缓冲电路,变压器T1和开关管Q1组成反激变换电路。设开关管Q1的占空比为,开关周期为TS,开关导通时间为Ton,关断时间为Toff,输入电流为i1,变压器匝数比为N1:N2,输出平均电压为Vo,开关管Q1按PWM周期性通断,在Q1导通的Toff=DTS期间,电源经过桥式整流模块DG1后电压VS加到绕组N1,电流i 1直线上升、N1磁通增加,电感储能增加,二极管D1反向截止,负载LED电流由电容提供;在Q1关断的Toff=(1-D)TS期间,N1通过续流二极管D2续流,同时将能量传送至二次侧绕组N2,二次侧绕组电流i2和磁通Φ从最大值开始减小,D1导通,从而将变压器的磁能转换为电能向负载供电。R 1和R 2组成的分压网络构成输出平均电压为Vo的采样电路,通过分压网络R 3和R 4采样Ri上的电位可以获得输出电流Io相应的电位信号。As shown in Figure 2, the main circuit structure consists of a rectifier bridge, a flyback conversion circuit (Flyback), an output rectification filter circuit, and a voltage and current sampling circuit. C 2 is the input filter capacitor. Resistor R 1 and diode D 2 form a simple buffer circuit. Transformer T 1 and switch tube Q 1 form a flyback conversion circuit. Let the duty cycle of switch tube Q1 be , the switching period is T S , the switch on time is T on , the off time is T off , the input current is i 1 , the transformer turns ratio is N 1 : N 2 , the average output voltage is V o , and the switch tube Q 1 According to the periodic on-off of PWM, during the T off = DT S period when Q 1 is turned on, the voltage V S is added to the winding N 1 after the power supply passes through the bridge rectifier module DG 1 , the current i 1 rises linearly, and the magnetic flux of N 1 increases. The energy storage of the inductor increases, the diode D1 reverses the cut - off, and the load LED current is controlled by the capacitor Provide; during T off = (1-D) T S when Q 1 is turned off, N 1 freewheels through the freewheeling diode D 2 , and at the same time transfers energy to the secondary side winding N 2 , the secondary side winding current i 2 And the magnetic flux Φ decreases from the maximum value, D 1 conducts, thereby converting the magnetic energy of the transformer into electrical energy to supply power to the load. The voltage divider network composed of R'1 and R'2 constitutes a sampling circuit with an output average voltage V o , and the potential signal corresponding to the output current I o can be obtained by sampling the potential on R i through the voltage divider network R'3 and R'4 .

如图3所示,为基于单周期控制技术的稳压控制器原理图。根据反激变换器的单周期控制方程组:As shown in Figure 3, it is a schematic diagram of a voltage regulator controller based on single-cycle control technology. According to the single-cycle governing equations of the flyback converter:

比较u1(t)和u2(t),即可确定占空比D,由式(1)可知,单周期控制环节需要一个积分环节,只要通过电路实现u1(t)和u2(t)的比较,即可确定瞬态占空比d及其平均值d。u1(t)为一个三角波,它经过误差放大器构成的带有复位开关的积分器得到,u2(t)由电流检测端输入信号经过运算得到,之后将u1(t)和u2(t)接入高速比较器。Comparing u 1 (t) and u 2 (t), the duty cycle D can be determined. According to formula (1), the single-cycle control link needs an integral link, as long as u 1 (t) and u 2 ( t) to determine the transient duty cycle d and its average value d ' . u 1 (t) is a triangular wave, which is obtained by an integrator with a reset switch formed by the error amplifier, u 2 (t) is obtained by operation of the input signal of the current detection terminal, and then u 1 (t) and u 2 ( t) Access the high-speed comparator.

如图4所示,为基于条件作用技术Anti-windup算法的恒流控制器原理图。As shown in Figure 4, it is a schematic diagram of a constant current controller based on the anti-windup algorithm of conditional technology.

积分器的输出状态为:The output state of the integrator is:

根据式(2)当积分器未饱和时,即u n =u s ,积分器的输出qk p e/t,此时恒流控制器为普通的PI控制器,输出电流Io按PI控制规律跟随给定电流Iref;当积分器饱和时,u n u s ,积分器的输出q下降,使积分器退出饱和,维持恒流控制器输出的线性连续性,使Io=Iref,提高系统的动态性能和输出电流的稳态精度。According to formula (2) when the integrator is not saturated, that is, u n = u s , the output of the integrator q = k p e / t , at this time the constant current controller is a common PI controller, and the output current I o is according to PI The control law follows the given current I ref ; when the integrator is saturated, u n > u s , the output q of the integrator drops, so that the integrator exits saturation and maintains the linear continuity of the output of the constant current controller, so that I o =I ref , to improve the dynamic performance of the system and the steady-state accuracy of the output current.

如图4所示,基于条件作用技术Anti-windup控制算法的恒流控制器输出的PWM信号与基于单周期控制的稳压控制器输出的PWM信号以及PWM调光器的PWM信号经过“与”逻辑模块输出一个PWM信号控制开关管的关断。As shown in Figure 4, the PWM signal output by the constant current controller based on the conditional technology Anti-windup control algorithm, the PWM signal output by the voltage regulator controller based on single-cycle control and the PWM signal of the PWM dimmer are "ANDed". The logic module outputs a PWM signal to control the switching off of the switch tube.

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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CN111526638A (en) * 2020-04-02 2020-08-11 漳州立达信光电子科技有限公司 LED drive circuit
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