CN105517245A - A LED constant current dimming power supply - Google Patents
A LED constant current dimming power supply Download PDFInfo
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Abstract
Description
技术领域 technical field
本发明属于电源技术领域,尤其涉及一种LED恒流调光电源。 The invention belongs to the technical field of power supplies, in particular to an LED constant current dimming power supply.
背景技术 Background technique
近年来,能源紧缺的现状使得人们愈发认识到节能减排的重要性。LED作为新型高效固体光源,具有节能、环保、寿命长、体积小等特点,在道路照明、隧道照明等大功率照明场合得到广泛的应用。 In recent years, the current situation of energy shortage has made people increasingly aware of the importance of energy conservation and emission reduction. As a new type of high-efficiency solid-state light source, LED has the characteristics of energy saving, environmental protection, long life and small size, and is widely used in high-power lighting occasions such as road lighting and tunnel lighting.
目前的LED平板灯驱动有恒流和恒压两种方式,对于LED这种光源一般意义来讲,采用恒流模式有利于其寿命的延长。因为在恒压模式下,一旦通过LED的电流有变化,LED的PN结的温度就会有所变化,这关乎LED的寿命,而恒流驱动就会保证通过LED的电流不会变化,也就不会出现LED的PN结温度变化。 Currently, there are two modes of driving LED panel lamps: constant current and constant voltage. Generally speaking, the constant current mode is beneficial to prolong the service life of LED light sources. Because in the constant voltage mode, once the current through the LED changes, the temperature of the PN junction of the LED will change, which is related to the life of the LED, and the constant current drive will ensure that the current through the LED will not change, that is, There will be no temperature variation of the PN junction of the LED.
但是,现有技术中的恒流LED电源无法实现智能调光,不能实现分时段调光,也不能实现对多个灯同时进行调光,随着照明需求的不断多样化,需要LED灯具在不同场景下具有不同的亮度,因此现有的恒定功率输出的驱动方式已经无法满足市场需求。 However, the constant-current LED power supply in the prior art cannot realize intelligent dimming, dimming by time intervals, and simultaneous dimming of multiple lamps. With the continuous diversification of lighting requirements, LED lamps are required to be The scene has different brightness, so the existing constant power output driving method can no longer meet the market demand.
有鉴于此,确有必要提供一种LED恒流调光电源,其能够实现分时段调光,并能同时对多个LED灯进行调光,从而可以实现节能减排,而且,输出信号是随DALI控制信号要求而相应地改变,从而提高了调光准确度和灵活性。 In view of this, it is indeed necessary to provide a LED constant-current dimming power supply, which can realize time-division dimming, and can dim multiple LED lights at the same time, so as to achieve energy saving and emission reduction. DALI control signal requirements are changed accordingly, thereby improving dimming accuracy and flexibility.
发明内容 Contents of the invention
本发明的目的在于:针对现有技术的不足,而提供一种LED恒流调光电源,其能够实现分时段调光,并能同时对多个LED灯进行调光,从而可以实现节能减排,而且,输出信号是随DALI控制信号要求而相应地改变,从而提高了调光准确度和灵活性。 The purpose of the present invention is to provide a LED constant-current dimming power supply for the deficiencies of the prior art, which can realize time-division dimming, and can simultaneously dim multiple LED lamps, so as to realize energy saving and emission reduction , Moreover, the output signal changes accordingly with the DALI control signal requirements, thereby improving the dimming accuracy and flexibility.
为了实现上述目的,本发明所采用如下技术方案: In order to achieve the above object, the present invention adopts the following technical solutions:
一种LED恒流调光电源,包括: An LED constant current dimming power supply, comprising:
DALI(DigitalAddressableLightingInterface数字可寻址照明接口)信号解码模块,用于对DALI控制信号进行解码; DALI (Digital Addressable Lighting Interface Digital Addressable Lighting Interface) signal decoding module, used to decode DALI control signals;
信号转换模块,接收DALI信号解码模块的信号并对其进行转换; The signal conversion module receives the signal of the DALI signal decoding module and converts it;
方波脉冲信号转换模块,用于将信号转换模块转换后的信号转变成一组根据控制信号变化的方波脉冲信号; The square wave pulse signal conversion module is used to convert the signal converted by the signal conversion module into a group of square wave pulse signals changed according to the control signal;
LED驱动控制模块,用于接收方波脉冲信号转换模块的方波脉冲信号; The LED drive control module is used to receive the square wave pulse signal of the square wave pulse signal conversion module;
和外部LED照明模块,接收LED驱动控制模块的信号,实现调光。 and an external LED lighting module to receive signals from the LED drive control module to realize dimming.
作为本发明LED恒流调光电源的一种改进,所述方波脉冲信号转换模块包括方波信号占空比控制模块、信号频率控制模块和信号放大输出模块,所述方波信号占空比控制模块的输入端和输出端分别与所述信号转换模块的输出端和所述信号频率控制模块的输入端连接,所述信号频率控制模块的输出端与所述信号放大输出模块的输入端连接,所述信号放大输出模块的输出端与所述LED驱动控制模块的输入端连接。 As an improvement of the LED constant current dimming power supply of the present invention, the square wave pulse signal conversion module includes a square wave signal duty cycle control module, a signal frequency control module and a signal amplification output module, and the square wave signal duty cycle The input end and the output end of the control module are respectively connected with the output end of the signal conversion module and the input end of the signal frequency control module, and the output end of the signal frequency control module is connected with the input end of the signal amplification output module , the output end of the signal amplification output module is connected to the input end of the LED drive control module.
作为本发明LED恒流调光电源的一种改进,所述电源还包括整流滤波模块,用于将交流市电转换成高压直流电; As an improvement of the LED constant-current dimming power supply of the present invention, the power supply also includes a rectification and filtering module for converting AC mains power into high-voltage DC power;
和DC/DC转换模块,用于将高压直流电变成若干组低电压。 And DC/DC conversion module, used to convert high voltage direct current into several groups of low voltage.
作为本发明LED恒流调光电源的一种改进,所述整流滤波模块包括保险丝F1、压敏电阻TVR、电感Lw、电容C1、电容CY1、电容CY2、电感L1、桥式整流滤波器BR、电感L2、电阻R3和电容C3,保险丝F1与火线连接,压敏电阻TVR的两端分别与保险丝F1和零线连接,电感Lw的两端与压敏电阻TVR的两端连接,电感Lw的另两端分别接电容C1的两端,电容C1的一端接电容CY2后接机壳,电感Lw的另两端中的一端接电容CY1后接机壳,电感L1的两端分别接电容C1的两端,电感L1的另两端与桥式整流滤波器BR的两个AC端连接;桥式整流滤波器BR的A+端接电感L2后通过电容C3接地,并且电感L2与P极连接;电阻R3与电感L2并联连接,桥式整流滤波器BR的A-端接地,并与N极连接。 As an improvement of the LED constant current dimming power supply of the present invention, the rectification and filtering module includes a fuse F1, a varistor TVR, an inductor Lw, a capacitor C1, a capacitor CY1, a capacitor CY2, an inductor L1, a bridge rectifier filter BR, Inductor L2, resistor R3 and capacitor C3, the fuse F1 is connected to the live wire, the two ends of the varistor TVR are connected to the fuse F1 and the neutral line respectively, the two ends of the inductance Lw are connected to the two ends of the varistor TVR, the other end of the inductance Lw The two ends are respectively connected to the two ends of the capacitor C1. One end of the capacitor C1 is connected to the capacitor CY2 and then connected to the casing. The other two ends of the inductor L1 are connected to the two AC terminals of the bridge rectifier filter BR; the A+ terminal of the bridge rectifier filter BR is connected to the inductor L2 and grounded through the capacitor C3, and the inductor L2 is connected to the P pole; the resistor R3 It is connected in parallel with the inductor L2, and the A-terminal of the bridge rectifier filter BR is grounded and connected to the N pole.
作为本发明LED恒流调光电源的一种改进,所述DC/DC转换模块包括芯片U1,芯片U1的第一引脚和第二引脚依次接电阻R12、电阻R14、二极管D5、二极管D12、电阻R21后接VCC,电阻R21还连接电容C8后接地,电容C8并联有电容C1,电阻R12并联有电阻R13,电阻R12和电阻R14均通过电容C4接地,电阻R21还通过电阻R61与电阻R12和电阻R10连接; As an improvement of the LED constant current dimming power supply of the present invention, the DC/DC conversion module includes a chip U1, and the first pin and the second pin of the chip U1 are sequentially connected to a resistor R12, a resistor R14, a diode D5, and a diode D12 , Resistor R21 is connected to VCC, resistor R21 is also connected to capacitor C8 and then grounded, capacitor C8 is connected in parallel with capacitor C1, resistor R12 is connected in parallel with resistor R13, resistor R12 and resistor R14 are grounded through capacitor C4, resistor R21 is also connected to resistor R12 through resistor R61 Connect with resistor R10;
芯片U1的第三引脚依次接电阻R9、电容C10后接地,芯片U1的第三引脚还依次通过电容C5、电阻R10与电阻R12连接,电容C5、电阻R10接地; The third pin of the chip U1 is connected to the resistor R9 and the capacitor C10 in turn, and then grounded. The third pin of the chip U1 is also connected to the resistor R12 through the capacitor C5, the resistor R10, and the capacitor C5 and the resistor R10 are connected to the ground;
芯片U1的第四引脚依次通过电阻R25、电阻R26后接地,电阻R26与电阻R29并联连接; The fourth pin of the chip U1 is grounded through the resistor R25 and the resistor R26 in turn, and the resistor R26 and the resistor R29 are connected in parallel;
芯片U1的第五引脚接电容C9后接地,芯片U1的第五引脚还通过电阻R23连接二极管D12和电阻R21,电阻R23与变压器T1的初级线圈连接; The fifth pin of the chip U1 is connected to the capacitor C9 and grounded, the fifth pin of the chip U1 is also connected to the diode D12 and the resistor R21 through the resistor R23, and the resistor R23 is connected to the primary coil of the transformer T1;
芯片U1的第六引脚接地,并与整流滤波模块的N极连接; The sixth pin of the chip U1 is grounded and connected to the N pole of the rectification and filtering module;
芯片U1的第七引脚通过电阻R22连接三极管Q1的基极,电阻R22并联有二极管D7,电阻R22还通过电阻R57连接三极管Q1的发射极、电阻R26、电阻R29和电阻R25,三极管Q1的集电极与变压器T1的初级线圈连接; The seventh pin of the chip U1 is connected to the base of the transistor Q1 through the resistor R22, the resistor R22 is connected in parallel with the diode D7, and the resistor R22 is also connected to the emitter of the transistor Q1, the resistor R26, the resistor R29 and the resistor R25 through the resistor R57, and the set of the transistor Q1 The electrodes are connected to the primary coil of the transformer T1;
芯片U1的第八引脚依次接电阻R16、电阻R15后连接整流滤波模块的P极和变压器T1的初级线圈,电阻R15还依次通过电容C3、二极管D6连接变压器T1的初级线圈,电容C3并联有电阻R19和电阻R20; The eighth pin of the chip U1 is connected to the resistor R16 and the resistor R15 in turn, and then connected to the P pole of the rectifier filter module and the primary coil of the transformer T1. The resistor R15 is also connected to the primary coil of the transformer T1 through the capacitor C3 and the diode D6 in turn, and the capacitor C3 is connected in parallel. Resistor R19 and resistor R20;
变压器T1的次级线圈通过二极管D10与VOUT连接,二极管D10还分别通过电容C12和电容C30接地,二极管D10与电容C99和电阻R242并连连接,容C99和电阻R242串联; The secondary coil of the transformer T1 is connected to VOUT through the diode D10, and the diode D10 is also grounded through the capacitor C12 and the capacitor C30 respectively, the diode D10 is connected in parallel with the capacitor C99 and the resistor R242, and the capacitor C99 and the resistor R242 are connected in series;
变压器T1的次级线圈还依次通过二极管D9、电阻R50、电阻RL2接VCC,电阻RL2还通过电容C18接地,电阻RL2还与三极管Q2的集电极连接,电阻RL2还通过电阻R45接三极管Q2的基极,电阻R45还通过二极管D20接地,三极管Q2的发射极与VDD连接,三极管Q2的发射极还通过电容C17接地。 The secondary coil of transformer T1 is also connected to VCC through diode D9, resistor R50, and resistor RL2 in sequence. Resistor RL2 is also grounded through capacitor C18. Resistor RL2 is also connected to the collector of transistor Q2. Resistor RL2 is also connected to the base of transistor Q2 through resistor R45. The resistor R45 is also grounded through the diode D20, the emitter of the transistor Q2 is connected to VDD, and the emitter of the transistor Q2 is also grounded through the capacitor C17.
作为本发明LED恒流调光电源的一种改进,所述DALI信号解码模块设置为解码芯片,所述信号转换模块设置为信号转换芯片,所述方波信号占空比控制模块设置为占空比控制芯片,所述信号频率控制模块设置为信号频率控制芯片,所述信号放大输出模块设置为信号放大输出芯片。 As an improvement of the LED constant current dimming power supply of the present invention, the DALI signal decoding module is set as a decoding chip, the signal conversion module is set as a signal conversion chip, and the square wave signal duty cycle control module is set as a duty cycle Compared with the control chip, the signal frequency control module is set as a signal frequency control chip, and the signal amplification output module is set as a signal amplification output chip.
作为本发明LED恒流调光电源的一种改进,所述LED驱动控制模块包括芯片U2; As an improvement of the LED constant current dimming power supply of the present invention, the LED drive control module includes a chip U2;
芯片U2的第一引脚连接电流检测芯片后接地,芯片U2的第一引脚与变压器T2的初级线圈连接; The first pin of the chip U2 is connected to the current detection chip and grounded, and the first pin of the chip U2 is connected to the primary coil of the transformer T2;
芯片U2的第三引脚接VOUT,芯片U2的第三引脚还通过二极管D14、电阻R47和电阻R51接地; The third pin of the chip U2 is connected to VOUT, and the third pin of the chip U2 is also grounded through the diode D14, the resistor R47 and the resistor R51;
芯片U2的第五引脚通过二极管D11接地,芯片U2的第五引脚还通过电感L3接变压器T2的次级线圈,电感L3通过电容C26与芯片U2的第一引脚连接; The fifth pin of the chip U2 is grounded through the diode D11, the fifth pin of the chip U2 is also connected to the secondary coil of the transformer T2 through the inductor L3, and the inductor L3 is connected to the first pin of the chip U2 through the capacitor C26;
芯片U2的第六引脚通过电阻R55接信号放大输出芯片,芯片U2的第六引脚还通过电容C25接地,电容C25并联连接有电阻R34,电阻R55通过电容C22接地,电阻R55还通过电阻R41与芯片U2的第七引脚连接; The sixth pin of the chip U2 is connected to the signal amplification output chip through the resistor R55, the sixth pin of the chip U2 is also grounded through the capacitor C25, the capacitor C25 is connected in parallel with the resistor R34, the resistor R55 is grounded through the capacitor C22, and the resistor R55 is also connected through the resistor R41 Connect with the seventh pin of chip U2;
芯片U2的第七引脚通过电容C24接地,电容C24还与电阻R51连接; The seventh pin of the chip U2 is grounded through the capacitor C24, and the capacitor C24 is also connected to the resistor R51;
变压器T2的初级线圈还与V-端连接,变压器T2的次级线圈还与V+端连接,V-端和V+端之间还连接有电阻R38。 The primary coil of the transformer T2 is also connected to the V- terminal, the secondary coil of the transformer T2 is also connected to the V+ terminal, and a resistor R38 is also connected between the V- terminal and the V+ terminal.
作为本发明LED恒流调光电源的一种改进,所述外部LED照明模块包括LED灯珠,所述LED灯珠分别与所述V-端和V+端连接。 As an improvement of the LED constant current dimming power supply of the present invention, the external LED lighting module includes LED lamp beads, and the LED lamp beads are respectively connected to the V- terminal and the V+ terminal.
作为本发明LED恒流调光电源的一种改进,所述LED灯珠设置为若干个,并且若干个所述LED灯珠串联连接。 As an improvement to the LED constant-current dimming power supply of the present invention, several LED lamp beads are provided, and the several LED lamp beads are connected in series.
作为本发明LED恒流调光电源的一种改进,所述解码芯片的型号为CTT-DLPWM-8,所述信号转换芯片的型号为AD0809,所述占空比控制芯片的型号为8253,所述信号频率控制芯片的型号为AD9832,所述信号放大输出芯片的型号为A7700。 As an improvement of the LED constant current dimming power supply of the present invention, the model of the decoding chip is CTT-DLPWM-8, the model of the signal conversion chip is AD0809, and the model of the duty cycle control chip is 8253, so The model of the signal frequency control chip is AD9832, and the model of the signal amplification output chip is A7700.
本发明的工作原理为: Working principle of the present invention is:
交流市电经过整流滤波模块的滤波—-直流—-滤波以后输出310V直流电压;通过DC/DC电压转换模块将直流310V高压变成3组低电压:第一路给芯片U1(VCC)供电;第二路给调光控制模块DL01供电(VDD);第三路输出给芯片U2(VOUT)供电,经滤波、信号控制以后给LED灯供电。 The AC mains output 310V DC voltage after being filtered by the rectification and filtering module--DC--filtering; through the DC/DC voltage conversion module, the DC 310V high voltage is converted into 3 groups of low voltages: the first circuit supplies power to the chip U1 (VCC); The second output powers the dimming control module DL01 (VDD); the third output supplies power to the chip U2 (VOUT), and supplies power to the LED lights after filtering and signal control.
其中,调光控制模块DL01包括信号解码、转换、调光控制模块等。从DA/DC、DA/GD端输入的DALI控制信号经MCU信号解码以后,将编码信号按要求转换成占空比随控制信号可变的数字方波信号,并且根据调光特性设定方波信号的频率,经过信号放大电路将信号放大并输出,进而控制芯片U2的输出电流和电压,最终实现对灯光的亮度大小进行智能控制,从而起到节能、环保和减排的作用。 Among them, the dimming control module DL01 includes signal decoding, conversion, dimming control modules and the like. After the DALI control signal input from the DA/DC and DA/GD terminals is decoded by the MCU signal, the coded signal is converted into a digital square wave signal whose duty cycle varies with the control signal as required, and the square wave is set according to the dimming characteristics. The frequency of the signal is amplified and output by the signal amplification circuit, and then the output current and voltage of the chip U2 are controlled, and finally the brightness of the light is intelligently controlled, thereby playing the role of energy saving, environmental protection and emission reduction.
相对于现有技术,本发明将DALI控制信号转换成一组根据控制信号变化的方波脉冲信号,实现对LED驱动控制器的电流和电压的控制,而且,输出信号是随DALI控制信号要求相应改变,从而提高了调光准确度和灵活性,可以实现分时段调光,并能同时对多个LED灯进行调光进而实现灯光的智能控制,实现节能减排促进环保。 Compared with the prior art, the present invention converts the DALI control signal into a group of square wave pulse signals that vary according to the control signal, and realizes the control of the current and voltage of the LED drive controller, and the output signal is changed accordingly according to the requirements of the DALI control signal , so as to improve the accuracy and flexibility of dimming, it can realize dimming in different periods, and can dim multiple LED lights at the same time to realize intelligent control of lighting, realize energy saving and emission reduction, and promote environmental protection.
附图说明 Description of drawings
下面结合说明书附图和具体实施方式,对本发明及其有益技术效果进行详细说明,其中: The present invention and its beneficial technical effects will be described in detail below in conjunction with the accompanying drawings and specific implementation methods, wherein:
图1为本发明的结构框图。 Fig. 1 is a structural block diagram of the present invention.
图2为本发明中整流滤波模块的电路图。 Fig. 2 is a circuit diagram of the rectification and filtering module in the present invention.
图3为本发明中DC/DC转换模块的电路图。 Fig. 3 is a circuit diagram of a DC/DC conversion module in the present invention.
图4为本发明的主要部分的电路结构示意图。 FIG. 4 is a schematic diagram of the circuit structure of the main part of the present invention.
具体实施方式 detailed description
下面结合实施例和说明书附图,对本发明作进一步详细的描述,但本发明的实施方式不限于此。 The present invention will be described in further detail below in conjunction with the examples and the accompanying drawings , but the implementation of the present invention is not limited thereto.
如图1至4所示,本发明提供的一种LED恒流调光电源,其特征在于,包括: As shown in Figures 1 to 4 , an LED constant current dimming power supply provided by the present invention is characterized in that it includes:
DALI信号解码模块1,用于对DALI控制信号进行解码; DALI signal decoding module 1, used to decode DALI control signals;
信号转换模块2,接收DALI信号解码模块1的信号并对其进行转换; The signal conversion module 2 receives and converts the signal of the DALI signal decoding module 1;
方波脉冲信号转换模块3,用于将信号转换模块2转换后的信号转变成一组根据控制信号变化的方波脉冲信号; The square wave pulse signal conversion module 3 is used to convert the signal converted by the signal conversion module 2 into a group of square wave pulse signals that vary according to the control signal;
LED驱动控制模块4,用于接收方波脉冲信号转换模块3的方波脉冲信号; The LED drive control module 4 is used to receive the square wave pulse signal of the square wave pulse signal conversion module 3;
和外部LED照明模块5,接收LED驱动控制模块4的信号,实现调光。 and the external LED lighting module 5 to receive the signal from the LED driving control module 4 to realize dimming.
其中,方波脉冲信号转换模块3包括方波信号占空比控制模块31、信号频率控制模块32和信号放大输出模块33,方波信号占空比控制模块31的输入端和输出端分别与信号转换模块2的输出端和信号频率控制模块32的输入端连接,信号频率控制模块32的输出端与信号放大输出模块33的输入端连接,信号放大输出模块33的输出端与LED驱动控制模块4的输入端连接。其中,方波信号占空比控制模块31可根据DALI控制信号的要求,产生方波信号使占空比可变,然后输出控制灯光。如此,就可以分时段的进行调光。 Wherein, the square wave pulse signal conversion module 3 comprises a square wave signal duty cycle control module 31, a signal frequency control module 32 and a signal amplification output module 33, and the input and output terminals of the square wave signal duty cycle control module 31 are respectively connected to the signal The output end of the conversion module 2 is connected to the input end of the signal frequency control module 32, the output end of the signal frequency control module 32 is connected to the input end of the signal amplification output module 33, and the output end of the signal amplification output module 33 is connected to the LED drive control module 4 input connection. Wherein, the square wave signal duty cycle control module 31 can generate a square wave signal to make the duty cycle variable according to the requirements of the DALI control signal, and then output the signal to control the light. In this way, it is possible to perform dimming in different periods of time.
电源还包括整流滤波模块6,用于将交流市电转换成高压直流电; The power supply also includes a rectification and filtering module 6, which is used to convert AC mains power into high-voltage direct current;
和DC/DC转换模块7,用于将高压直流电变成若干组低电压。 And a DC/DC conversion module 7, used to convert the high-voltage direct current into several groups of low voltages.
整流滤波模块6包括保险丝F1、压敏电阻TVR、电感Lw、电容C1、电容CY1、电容CY2、电感L1、桥式整流滤波器BR、电感L2、电阻R3和电容C3,保险丝F1与火线连接,压敏电阻TVR的两端分别与保险丝F1和零线连接,电感Lw的两端与压敏电阻TVR的两端连接,电感Lw的另两端分别接电容C1的两端,电容C1的一端接电容CY2后接机壳,电感Lw的另两端中的一端接电容CY1后接机壳,电感L1的两端分别接电容C1的两端,电感L1的另两端与桥式整流滤波器BR的两个AC端连接;桥式整流滤波器BR的A+端接电感L2后通过电容C3接地,并且电感L2与P极连接;电阻R3与电感L2并联连接,桥式整流滤波器BR的A-端接地,并与N极连接。 The rectification and filtering module 6 includes a fuse F1, a varistor TVR, an inductor Lw, a capacitor C1, a capacitor CY1, a capacitor CY2, an inductor L1, a bridge rectifier filter BR, an inductor L2, a resistor R3, and a capacitor C3. The fuse F1 is connected to the fire wire, The two ends of the varistor TVR are respectively connected to the fuse F1 and the neutral line, the two ends of the inductance Lw are connected to the two ends of the varistor TVR, the other two ends of the inductance Lw are respectively connected to the two ends of the capacitor C1, and one end of the capacitor C1 is connected to Capacitor CY2 is connected to the casing, one of the other ends of the inductor Lw is connected to the capacitor CY1 and connected to the casing, the two ends of the inductor L1 are respectively connected to the two ends of the capacitor C1, and the other two ends of the inductor L1 are connected to the bridge rectifier filter BR The two AC terminals of the bridge rectifier filter BR are connected to the inductor L2 and grounded through the capacitor C3, and the inductor L2 is connected to the P pole; the resistor R3 is connected in parallel with the inductor L2, and the A- of the bridge rectifier filter BR The terminal is grounded and connected to the N pole.
DC/DC转换模块7包括芯片U1,芯片U1的第一引脚和第二引脚依次接电阻R12、电阻R14、二极管D5、二极管D12、电阻R21后接VCC,电阻R21还连接电容C8后接地,电容C8并联有电容C1,电阻R12并联有电阻R13,电阻R12和电阻R14均通过电容C4接地,电阻R21还通过电阻R61与电阻R12和电阻R10连接; The DC/DC conversion module 7 includes a chip U1, the first pin and the second pin of the chip U1 are sequentially connected to a resistor R12, a resistor R14, a diode D5, a diode D12, a resistor R21 and then connected to VCC, and the resistor R21 is also connected to a capacitor C8 and then grounded , capacitor C8 is connected in parallel with capacitor C1, resistor R12 is connected in parallel with resistor R13, resistor R12 and resistor R14 are grounded through capacitor C4, resistor R21 is also connected with resistor R12 and resistor R10 through resistor R61;
芯片U1的第三引脚依次接电阻R9、电容C10后接地,芯片U1的第三引脚还依次通过电容C5、电阻R10与电阻R12连接,电容C5、电阻R10接地; The third pin of the chip U1 is connected to the resistor R9 and the capacitor C10 in turn, and then grounded. The third pin of the chip U1 is also connected to the resistor R12 through the capacitor C5, the resistor R10, and the capacitor C5 and the resistor R10 are connected to the ground;
芯片U1的第四引脚依次通过电阻R25、电阻R26后接地,电阻R26与电阻R29并联连接; The fourth pin of the chip U1 is grounded through the resistor R25 and the resistor R26 in turn, and the resistor R26 and the resistor R29 are connected in parallel;
芯片U1的第五引脚接电容C9后接地,芯片U1的第五引脚还通过电阻R23连接二极管D12和电阻R21,电阻R23与变压器T1的初级线圈连接; The fifth pin of the chip U1 is connected to the capacitor C9 and grounded, the fifth pin of the chip U1 is also connected to the diode D12 and the resistor R21 through the resistor R23, and the resistor R23 is connected to the primary coil of the transformer T1;
芯片U1的第六引脚接地,并与整流滤波模块的N极连接; The sixth pin of the chip U1 is grounded and connected to the N pole of the rectification and filtering module;
芯片U1的第七引脚通过电阻R22连接三极管Q1的基极,电阻R22并联有二极管D7,电阻R22还通过电阻R57连接三极管Q1的发射极、电阻R26、电阻R29和电阻R25,三极管Q1的集电极与变压器T1的初级线圈连接; The seventh pin of the chip U1 is connected to the base of the transistor Q1 through the resistor R22, the resistor R22 is connected in parallel with the diode D7, and the resistor R22 is also connected to the emitter of the transistor Q1, the resistor R26, the resistor R29 and the resistor R25 through the resistor R57, and the set of the transistor Q1 The electrodes are connected to the primary coil of the transformer T1;
芯片U1的第八引脚依次接电阻R16、电阻R15后连接整流滤波模块的P极和变压器T1的初级线圈,电阻R15还依次通过电容C3、二极管D6连接变压器T1的初级线圈,电容C3并联有电阻R19和电阻R20; The eighth pin of the chip U1 is connected to the resistor R16 and the resistor R15 in turn, and then connected to the P pole of the rectifier filter module and the primary coil of the transformer T1. The resistor R15 is also connected to the primary coil of the transformer T1 through the capacitor C3 and the diode D6 in turn, and the capacitor C3 is connected in parallel. Resistor R19 and resistor R20;
变压器T1的次级线圈通过二极管D10与VOUT连接,二极管D10还分别通过电容C12和电容C30接地,二极管D10与电容C99和电阻R242并连连接,容C99和电阻R242串联; The secondary coil of the transformer T1 is connected to VOUT through the diode D10, and the diode D10 is also grounded through the capacitor C12 and the capacitor C30 respectively, the diode D10 is connected in parallel with the capacitor C99 and the resistor R242, and the capacitor C99 and the resistor R242 are connected in series;
变压器T1的次级线圈还依次通过二极管D9、电阻R50、电阻RL2接VCC,电阻RL2还通过电容C18接地,电阻RL2还与三极管Q2的集电极连接,电阻RL2还通过电阻R45接三极管Q2的基极,电阻R45还通过二极管D20接地,三极管Q2的发射极与VDD连接,三极管Q2的发射极还通过电容C17接地。 The secondary coil of transformer T1 is also connected to VCC through diode D9, resistor R50, and resistor RL2 in sequence. Resistor RL2 is also grounded through capacitor C18. Resistor RL2 is also connected to the collector of transistor Q2. Resistor RL2 is also connected to the base of transistor Q2 through resistor R45. The resistor R45 is also grounded through the diode D20, the emitter of the transistor Q2 is connected to VDD, and the emitter of the transistor Q2 is also grounded through the capacitor C17.
DALI信号解码模块1设置为解码芯片,信号转换模块2设置为信号转换芯片,方波信号占空比控制模块31设置为占空比控制芯片,信号频率控制模块32设置为信号频率控制芯片,信号放大输出模块33设置为信号放大输出芯片。本实施例中,这几个芯片集成在同一个MCU里面(DL01),如图4的框图所示。 The DALI signal decoding module 1 is set as a decoding chip, the signal conversion module 2 is set as a signal conversion chip, the square wave signal duty cycle control module 31 is set as a duty cycle control chip, and the signal frequency control module 32 is set as a signal frequency control chip. The amplification output module 33 is configured as a signal amplification output chip. In this embodiment, these chips are integrated in the same MCU (DL01), as shown in the block diagram of FIG . 4 .
LED驱动控制模块4包括芯片U2; The LED drive control module 4 includes a chip U2;
芯片U2的第一引脚连接电流检测芯片后接地,芯片U2的第一引脚与变压器T2的初级线圈连接; The first pin of the chip U2 is connected to the current detection chip and grounded, and the first pin of the chip U2 is connected to the primary coil of the transformer T2;
芯片U2的第三引脚接VOUT,芯片U2的第三引脚还通过二极管D14、电阻R47和电阻R51接地; The third pin of the chip U2 is connected to VOUT, and the third pin of the chip U2 is also grounded through the diode D14, the resistor R47 and the resistor R51;
芯片U2的第五引脚通过二极管D11接地,芯片U2的第五引脚还通过电感L3接变压器T2的次级线圈,电感L3通过电容C26与芯片U2的第一引脚连接; The fifth pin of the chip U2 is grounded through the diode D11, the fifth pin of the chip U2 is also connected to the secondary coil of the transformer T2 through the inductor L3, and the inductor L3 is connected to the first pin of the chip U2 through the capacitor C26;
芯片U2的第六引脚通过电阻R55接信号放大输出芯片,芯片U2的第六引脚还通过电容C25接地,电容C25并联连接有电阻R34,电阻R55通过电容C22接地,电阻R55还通过电阻R41与芯片U2的第七引脚连接; The sixth pin of the chip U2 is connected to the signal amplification output chip through the resistor R55, the sixth pin of the chip U2 is also grounded through the capacitor C25, the capacitor C25 is connected in parallel with the resistor R34, the resistor R55 is grounded through the capacitor C22, and the resistor R55 is also connected through the resistor R41 Connect with the seventh pin of chip U2;
芯片U2的第七引脚通过电容C24接地,电容C24还与电阻R51连接; The seventh pin of the chip U2 is grounded through the capacitor C24, and the capacitor C24 is also connected to the resistor R51;
变压器T2的初级线圈还与V-端连接,变压器T2的次级线圈还与V+端连接,V-端和V+端之间还连接有电阻R38。通过控制U2的功率转换来控制LED灯。 The primary coil of the transformer T2 is also connected to the V- terminal, the secondary coil of the transformer T2 is also connected to the V+ terminal, and a resistor R38 is also connected between the V- terminal and the V+ terminal. The LED lights are controlled by controlling the power conversion of U2.
外部LED照明模块5包括LED灯珠,LED灯珠分别与V-端和V+端连接。 The external LED lighting module 5 includes LED lamp beads, and the LED lamp beads are respectively connected to the V- terminal and the V+ terminal.
LED灯珠设置为若干个,并且若干个LED灯珠串联连接,这样就可以同时控制多个LED灯珠的亮度。 There are several LED lamp beads, and several LED lamp beads are connected in series, so that the brightness of multiple LED lamp beads can be controlled at the same time.
解码芯片的型号为CTT-DLPWM-8,信号转换芯片的型号为AD0809,占空比控制芯片的型号为8253,信号频率控制芯片的型号为AD9832,信号放大输出芯片的型号为A7700。 The model of the decoding chip is CTT-DLPWM-8, the model of the signal conversion chip is AD0809, the model of the duty ratio control chip is 8253, the model of the signal frequency control chip is AD9832, and the model of the signal amplification output chip is A7700.
本发明的工作原理为: Working principle of the present invention is:
交流市电经过整流滤波模块6的滤波—-直流—-滤波以后输出310V直流电压;通过DC/DC电压转换模块7将直流310V高压变成3组低电压:第一路给芯片U1(VCC)供电;第二路给调光控制模块DL01供电(VDD);第三路输出给芯片U2(VOUT)供电,再经滤波、信号控制以后给LED灯供电。 The AC mains output 310V DC voltage after being filtered by the rectification and filtering module 6--DC--filtering; through the DC/DC voltage conversion module 7, the DC 310V high voltage is converted into 3 groups of low voltages: the first channel is for the chip U1 (VCC) Power supply; the second output powers the dimming control module DL01 (VDD); the third output supplies power to the chip U2 (VOUT), and then supplies power to the LED lights after filtering and signal control.
其中,调光控制模块(MCU)DL01包括信号解码、转换、调光控制模块等。从DA/DC、DA/GD端输入的DALI控制信号经MCU信号解码以后,将编码信号按要求转换成占空比随控制信号可变的数字方波信号,并且根据调光特性设定方波信号的频率,经过信号放大电路将信号放大并输出,进而控制芯片U2的输出电流和电压,最终实现对灯光的亮度大小进行智能控制,从而起到节能、环保和减排的作用。 Among them, the dimming control module (MCU) DL01 includes signal decoding, conversion, dimming control modules, etc. After the DALI control signal input from the DA/DC and DA/GD terminals is decoded by the MCU signal, the coded signal is converted into a digital square wave signal whose duty cycle varies with the control signal as required, and the square wave is set according to the dimming characteristics. The frequency of the signal is amplified and output by the signal amplification circuit, and then the output current and voltage of the chip U2 are controlled, and finally the brightness of the light is intelligently controlled, thereby playing the role of energy saving, environmental protection and emission reduction.
本发明将DALI控制信号转换成一组根据控制信号变化的方波脉冲信号,实现对LED驱动控制器的电流和电压的控制,而且,输出信号是随DALI控制信号要求相应改变,从而提高了调光准确度和灵活性,可以实现分时段调光,并能同时对多个LED灯进行调光进而实现灯光的智能控制,实现节能减排促进环保。 The present invention converts the DALI control signal into a group of square wave pulse signals according to the change of the control signal to realize the control of the current and voltage of the LED drive controller, and the output signal is changed correspondingly according to the requirements of the DALI control signal, thereby improving the dimming efficiency. Accuracy and flexibility can realize time-segmented dimming, and can dim multiple LED lights at the same time to realize intelligent control of lighting, realize energy saving and emission reduction, and promote environmental protection.
根据上述说明书的揭示和教导,本发明所属领域的技术人员还可以对上述实施方式进行变更和修改。因此,本发明并不局限于上面揭示和描述的具体实施方式,对本发明的一些修改和变更也应当落入本发明的权利要求的保护范围内。此外,尽管本说明书中使用了一些特定的术语,但这些术语只是为了方便说明,并不对本发明构成任何限制。 According to the disclosure and teaching of the above-mentioned specification, those skilled in the art to which the present invention belongs can also make changes and modifications to the above-mentioned embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.
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CN110475407A (en) * | 2019-08-28 | 2019-11-19 | 深圳市帝狼光电有限公司 | A kind of LED desk lamp control circuit |
CN113966025A (en) * | 2021-10-26 | 2022-01-21 | 深圳市紫光照明技术股份有限公司 | Dimming method, dimming controller and dimming control system |
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