CN105792441A - A linear constant current circuit for thyristor dimming - Google Patents
A linear constant current circuit for thyristor dimming Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于LED控制领域，特别涉及一种用于可控硅调光的线性恒流电路。The invention belongs to the field of LED control, and in particular relates to a linear constant current circuit for dimming of silicon controlled rectifiers.
背景技术Background technique
LED高压线性恒流技术以其方案简单、成本低廉、无高频变压器和无EMC问题等优点得到越来越广泛的应用，并逐步运用到LED可控硅调光中。LED high-voltage linear constant current technology has been more and more widely used due to its advantages of simple scheme, low cost, no high-frequency transformer and no EMC problems, and is gradually applied to LED thyristor dimming.
目前市场现有的应用于LED可控硅调光的线性恒流电路，如图1所示，输入交流电压源电学串联一个可控硅调光器101，再连接到整流桥102的两个输入端，经整流桥102整流后电学连接LED灯串105正端，LED灯串105负端电学连接主控芯片103，流经LED灯串105的电流由主控芯片103和电流调节电阻104决定，维持电流控制芯片106和维持电流调节电阻107提供可控硅调光的维持电流。电路需要LED灯串105的导通压降VLED高度匹配经整流桥102整流输入电压后得到的母线电压VLINE，否则VLED远小于VLINE时，电路效率会极低，主控芯片103上要承受相当大的损耗，带来的后果是芯片发烫严重，影响电路正常工作，甚至会损坏。At present, the existing linear constant current circuit used in the LED thyristor dimming is shown in Fig. 1. The input AC voltage source is electrically connected in series with a thyristor dimmer 101, and then connected to the two inputs of the rectifier bridge 102. After being rectified by the rectifier bridge 102, it is electrically connected to the positive end of the LED light string 105, and the negative end of the LED light string 105 is electrically connected to the main control chip 103. The current flowing through the LED light string 105 is determined by the main control chip 103 and the current adjustment resistor 104. The sustain current control chip 106 and the sustain current regulating resistor 107 provide the sustain current for the thyristor dimming. The circuit needs the turn-on voltage drop V LED of the LED light string 105 to highly match the bus voltage V LINE obtained after the input voltage is rectified by the rectifier bridge 102 , otherwise, when V LED is much smaller than V LINE , the circuit efficiency will be extremely low, and the main control chip 103 will To withstand considerable loss, the consequence is that the chip becomes very hot, which affects the normal operation of the circuit and even damages it.
若LED灯串105的导通压降VLED能高度匹配输入电压VLINE，效率能做到90％以上，但此时会有调光角度小、调光范围低、LED灯串105利用率低的问题。如图2(a)所示，母线电压VLINE经交流输入电压经整流桥102整流后得到，是一个正弦半波，幅值随位相角α的变化而变化，为便于阐述，这里的α取0至180°之间进行分析，VLINE幅值等于VLED时的位相角记为α0，由正弦半波的对称性，另一幅值相等的位相角为180°-α0；位相角在α0与180°-α0之间时，VLINE幅值高于VLED，LED灯串105点亮，输出电流IOUT。其余时间，LED灯串105不被点亮。在一个正弦半波周期内，LED灯串105所串入的LED数量越多，VLED越接近VLINE幅值，整个电路的效率会越高，但LED灯串105被点亮的时间就越短，利用率越低。If the conduction voltage drop V LED of the LED light string 105 can highly match the input voltage V LINE , the efficiency can reach more than 90%, but at this time there will be a small dimming angle, a low dimming range, and a low utilization rate of the LED light string 105 The problem. As shown in Figure 2(a), the bus voltage V LINE is rectified by the AC input voltage and rectified by the rectifier bridge 102. It is a half-sine wave whose amplitude varies with the phase angle α. For the sake of illustration, α here is taken as Analyze between 0 and 180°, the phase angle when the amplitude of V LINE is equal to V LED is recorded as α 0 , due to the symmetry of the half-sine wave, the other phase angle with the same amplitude is 180°-α 0 ; the phase angle When between α 0 and 180°-α 0 , the amplitude of V LINE is higher than V LED , the LED light string 105 lights up, and the output current I OUT . During the rest of the time, the LED light string 105 is not lit. In a sine half-wave cycle, the more LEDs connected in series to the LED light string 105, and the closer V LED is to the V LINE amplitude, the higher the efficiency of the entire circuit will be, but the longer the LED light string 105 is lit. The shorter the value, the lower the utilization rate.
由于LED灯串105在α0与180°-α0之间时才能被点亮，所以可控硅调光器101真正能调光的范围也只在α0与180°-α0之间，如图2(b)所示，一旦可控硅调光器101的切角β大于180°-α0，LED灯串105熄灭，不具备调光功能。在一个正弦半波周期内，VLED越接近VLINE幅值，可控硅调光器101的调光范围越窄。Since the LED light string 105 can only be lit when it is between α 0 and 180°-α 0 , the real dimming range of the thyristor dimmer 101 is only between α 0 and 180°-α 0 , As shown in FIG. 2( b ), once the cutting angle β of the thyristor dimmer 101 is greater than 180°-α 0 , the LED light string 105 is turned off and does not have a dimming function. In a sine half-wave period, the closer V LED is to the amplitude of V LINE , the narrower the dimming range of the thyristor dimmer 101 is.
可控硅调光器101调光时，整个LED灯串105在一个正弦半波周期内的输出电流平均值随切角β变化的曲线图如图2(c)所示。When the thyristor dimmer 101 is dimming, the average value of the output current of the entire LED lamp string 105 within a sine half-wave cycle varies with the cut angle β as shown in FIG. 2( c ).
综上所述，目前市场现有的应用于LED可控硅调光的线性恒流电路，LED灯串随串入LED的数量需高度匹配输入电压：串入的LED数量越低，损耗越大，甚至会影响电流的正常工作；串入的LED数量越高，LED灯串利用率越低，可控硅调光的调光范围越窄。To sum up, in the existing linear constant current circuit used in LED thyristor dimming, the LED light string needs to highly match the input voltage with the number of LEDs connected in series: the lower the number of LEDs connected in series, the greater the loss , and even affect the normal operation of the current; the higher the number of LEDs connected in series, the lower the utilization rate of the LED light string, and the narrower the dimming range of the thyristor dimming.
发明内容Contents of the invention
发明目的：为了克服现有技术的不足，本发明提供了一种有效提高效率，减小损耗、增大可控硅调光的调光范围的可控硅调光的线性恒流电路。Purpose of the invention: In order to overcome the deficiencies of the prior art, the present invention provides a linear constant current circuit for thyristor dimming that can effectively improve efficiency, reduce loss, and increase the dimming range of thyristor dimming.
技术方案：本发明提供了一种用于可控硅调光的线性恒流电路，可控硅调光器、整流桥、第一线性恒流芯片、第一电流调节电阻、第二线性恒流芯片、第二电流调节电阻、第三线性恒流芯片、第三电流调节电阻、二极管、第一LED灯串、第二LED灯串和维持电流调节模块；所述可控硅调光器与交流输入电压源电学串联；整流桥的两个输入端分别与可控硅调光器和交流输入电压源电学连接；第一线性恒流芯片的OUT端与整流桥的正输出端电学连接；第一电流调节电阻的一端与第一线性恒流芯片的REXT端电学连接；第一电流调节电阻的另一端分别与第一线性恒流芯片的GND端、第二线性恒流芯片的OUT端和第一LED灯串的正端电学连接；第二线性恒流芯片的REXT端分别与第二电流调节电阻的一端和二极管的阴极电学连接；第二线性恒流芯片的GND端分别与第二电流调节电阻的另一端、第二LED灯串的正端电学连接；第一LED灯串的负端分别与二极管的阳极和第三线性恒流芯片的OUT端电学连接；第三线性恒流芯片的REXT端分别与第三电流调节电阻的一端、第二LED灯串的负端电学连接；第三线性恒流芯片的GND端分别与第三电流调节电阻的另一端、整流桥的输出负端电学连接；所述维持电流调节模块用于给所述可控硅调光器提供调光维持电流。Technical solution: The present invention provides a linear constant current circuit for thyristor dimming, a thyristor dimmer, a rectifier bridge, a first linear constant current chip, a first current adjusting resistor, a second linear constant current chip, a second current regulating resistor, a third linear constant current chip, a third current regulating resistor, a diode, a first LED light string, a second LED light string and a maintenance current regulating module; the thyristor dimmer and the AC The input voltage source is electrically connected in series; the two input terminals of the rectifier bridge are respectively electrically connected with the thyristor dimmer and the AC input voltage source; the OUT terminal of the first linear constant current chip is electrically connected with the positive output terminal of the rectifier bridge; the first One end of the current adjustment resistor is electrically connected to the REXT end of the first linear constant current chip; the other end of the first current adjustment resistor is respectively connected to the GND end of the first linear constant current chip, the OUT end of the second linear constant current chip and the first The positive end of the LED light string is electrically connected; the REXT end of the second linear constant current chip is electrically connected with one end of the second current adjusting resistor and the cathode of the diode respectively; the GND end of the second linear constant current chip is respectively connected with the second current adjusting resistor The other end of the LED light string is electrically connected to the positive end of the second LED light string; the negative end of the first LED light string is electrically connected to the anode of the diode and the OUT end of the third linear constant current chip; the REXT end of the third linear constant current chip respectively electrically connected to one end of the third current adjusting resistor and the negative end of the second LED light string; the GND end of the third linear constant current chip is respectively electrically connected to the other end of the third current adjusting resistor and the output negative end of the rectifier bridge; The maintaining current regulating module is used for providing the dimming maintaining current for the thyristor dimmer.
进一步，所述维持电流调节模块包括维持电流调节电阻，所述维持电流调节电阻的两端分别与二极管的阴极和阳极电连接。Further, the maintaining current regulation module includes a maintaining current regulating resistor, and the two ends of the maintaining current regulating resistor are respectively electrically connected to the cathode and the anode of the diode.
进一步，所述维持电流调节模块包括维持电流调节电阻和维持电流控制芯片，所述维持电流控制芯片的OUT端电与第一线性恒流芯片的REXT端电连接；维持电流控制芯片的GND端分别与维持电流调节电阻的一端和整流桥的输出负端电学连接；维持电流控制芯片的REXT端分别与维持电流调节电阻的另一端和第三线性恒流芯片的GND端电学连接。这样能够提供更大的维持电流，同时能兼容更多不同型号的可控硅调光器和更宽的输入功率范围。Further, the maintenance current regulation module includes a maintenance current regulation resistor and a maintenance current control chip, the OUT terminal of the maintenance current control chip is electrically connected to the REXT terminal of the first linear constant current chip; the GND terminals of the maintenance current control chip are respectively It is electrically connected with one end of the maintaining current regulating resistor and the output negative terminal of the rectifier bridge; the REXT terminal of maintaining the current control chip is electrically connected with the other end of maintaining the current regulating resistor and the GND terminal of the third linear constant current chip respectively. In this way, a larger holding current can be provided, and at the same time, it can be compatible with more different types of thyristor dimmers and a wider input power range.
进一步，所述第一电流调节电阻的阻值小于第三电流调节电阻的阻值，第二电流调节电阻的阻值大于第三电流调节电阻的阻值。Further, the resistance value of the first current regulating resistor is smaller than the resistance value of the third current regulating resistor, and the resistance value of the second current regulating resistor is larger than the resistance value of the third current regulating resistor.
进一步，所述第二电流调节电阻的阻值为第三电流调节电阻阻值的两倍。这样通过两组LED灯串的电流大小相等，有效的提高了两组LED灯串的利用率。Further, the resistance of the second current regulating resistor is twice the resistance of the third current regulating resistor. In this way, the currents passing through the two groups of LED light strings are equal in magnitude, which effectively improves the utilization rate of the two groups of LED light strings.
进一步，所述第一线性恒流芯片、第二线性恒流芯片和第三线性恒流芯片的型号均为CL1570。Further, the models of the first linear constant current chip, the second linear constant current chip and the third linear constant current chip are all CL1570.
进一步，所述维持电流控制芯片的型号为CL1570。Further, the model of the maintaining current control chip is CL1570.
本发明还提供了一种用于可控硅调光的线性恒流电路，可控硅调光器、整流桥、第一线性恒流芯片、第一电流调节电阻、第二线性恒流芯片、第二电流调节电阻、第三线性恒流芯片、第三电流调节电阻、二极管、第一LED灯串、第二LED灯串和维持电流调节模块；交流输入电压源提供的电流依次经过可控硅调光器和整流桥后进入母线，当母线电压高于1个灯串的压降而低于两个灯串串联的压降时，第一线性恒流芯片直通，第一LED灯串和第二LED灯串并联点亮，母线电流分流到两条灯串所在的支路，其中一条支路中电流依次通过二线性恒流芯片、第二电流调节电阻和第二LED灯串；另一条支路中电流依次通过第一LED灯串和第三线性恒流芯片，两条支路的输出电流均通过第三电流调节电阻后回到整流桥；当母线电压高于两个灯串串联的压降时，第二线性恒流芯片和第三线性恒流芯片不工作，第一LED灯串和第二LED灯串串联点亮；母线电流依次通过第一线性恒流芯片、第一电流调节电阻、第一LED灯串、第二电流调节电阻、二极管和第二LED灯串后回到整流桥；所述维持电流调节模块用于给所述可控硅调光器提供调光维持电流。The present invention also provides a linear constant current circuit for thyristor dimming, a thyristor dimmer, a rectifier bridge, a first linear constant current chip, a first current regulating resistor, a second linear constant current chip, The second current adjustment resistor, the third linear constant current chip, the third current adjustment resistor, diode, the first LED light string, the second LED light string and the maintenance current adjustment module; the current provided by the AC input voltage source passes through the thyristor in sequence After the dimmer and rectifier bridge enter the busbar, when the busbar voltage is higher than the voltage drop of one light string but lower than the voltage drop of two light strings connected in series, the first linear constant current chip is connected directly, and the first LED light string and the second LED light string The two LED light strings are connected in parallel, and the bus current is shunted to the branches where the two light strings are located. The current in one branch passes through the second linear constant current chip, the second current adjustment resistor and the second LED light string in turn; the other branch The current in the circuit passes through the first LED lamp string and the third linear constant current chip in turn, and the output current of the two branches passes through the third current regulating resistor and then returns to the rectifier bridge; when the bus voltage is higher than the voltage of the two lamp strings connected in series When falling, the second linear constant current chip and the third linear constant current chip do not work, and the first LED light string and the second LED light string light up in series; the bus current passes through the first linear constant current chip and the first current adjusting resistor in turn. , the first LED lamp string, the second current regulating resistor, the diode and the second LED lamp string return to the rectifier bridge; the maintaining current regulating module is used to provide the dimming maintaining current for the thyristor dimmer.
工作原理：本发明将三组线性恒流模块与两组LED灯串进行结合，同时根据每组线性恒流模块在电路中的位置设置不同阻值的电流调节电阻，从而使两组LED灯串可以根据输入电压的高低自适应地进行并联连接或串联连接。Working principle: The present invention combines three sets of linear constant current modules with two sets of LED light strings, and at the same time sets current adjustment resistors with different resistance values according to the position of each set of linear constant current modules in the circuit, so that the two sets of LED light strings It can be connected in parallel or in series adaptively according to the level of the input voltage.
有益效果：与现有技术相比，本发明有效的提高了LED灯串的利用率、增大可控硅调光的调光范围，同时，保证了电路的工作效率，减少电路损耗。Beneficial effects: Compared with the prior art, the present invention effectively improves the utilization rate of LED light strings, increases the dimming range of thyristor dimming, and at the same time ensures the working efficiency of the circuit and reduces circuit loss.
附图说明Description of drawings
图1为现有技术中用于LED可控硅调光的线性恒流电路的电路图；FIG. 1 is a circuit diagram of a linear constant current circuit used for LED thyristor dimming in the prior art;
图2为现有技术电路的LED可控硅调光线性恒流工作波形示意图；其中，图2(a)为不接可控硅调光器时LED灯串输出电流与输入电压关系图；图2(b)为接入可控硅调光器时LED灯串电流与输入电压关系图；图2(c)为电路输出电流与可控硅调光器调光切角的关系图；Fig. 2 is a schematic diagram of the linear constant current working waveform of the LED thyristor dimming of the prior art circuit; wherein, Fig. 2 (a) is a relation diagram between the output current and the input voltage of the LED lamp string when the thyristor dimmer is not connected; Fig. 2(b) is a diagram of the relationship between the LED lamp string current and the input voltage when the thyristor dimmer is connected; Figure 2(c) is a diagram of the relationship between the circuit output current and the dimming angle of the thyristor dimmer;
图3为实施例1的电路图；Fig. 3 is the circuit diagram of embodiment 1;
图4为实施例1中当母线电压VLINE高于VLED并低于2*VLED时，电路中电流的走向示意图；4 is a schematic diagram of the current flow in the circuit when the bus voltage V LINE is higher than V LED and lower than 2*V LED in Embodiment 1;
图5为实施例1中当母线电压VLINE高于2*VLED时，电路中电流的走向示意图；5 is a schematic diagram of the current flow in the circuit when the bus voltage V LINE is higher than 2*V LED in Embodiment 1;
图6为实施例1中ISTEP1、ISTEP2以及ISTEP1、ISTEP2相叠加的灯串输出电流IOUT随母线电压VLINE变化的波形图；Fig. 6 is a waveform diagram of I STEP1 , I STEP2 and I STEP1 , I STEP2 superimposed in the embodiment 1, and the output current I OUT of the light string changes with the bus voltage V LINE ;
图7为实施例1中输出电流与可控硅调光器调光切角的关系图；Fig. 7 is a diagram of the relationship between the output current and the dimming angle of the thyristor dimmer in Embodiment 1;
图8为实施例2的电路图。FIG. 8 is a circuit diagram of Embodiment 2. FIG.
具体实施方式detailed description
为进一步揭示本发明的技术方案，兹结合附图详细说明本发明的实施方式。In order to further reveal the technical solutions of the present invention, the implementation manners of the present invention will be described in detail in conjunction with the accompanying drawings.
实施例1：Example 1:
如图3所示，本发明提供了一种用于可控硅调光的线性恒流电路，包括可控硅调光器201、整流桥202、第一线性恒流芯片203、第一电流调节电阻204、第二线性恒流芯片205、第二电流调节电阻206、第三线性恒流芯片207、第三电流调节电阻208、二极管209、第一LED灯串210、第二LED灯串211和维持电流调节电阻212。As shown in Figure 3, the present invention provides a linear constant current circuit for thyristor dimming, including a thyristor dimmer 201, a rectifier bridge 202, a first linear constant current chip 203, a first current regulator Resistor 204, second linear constant current chip 205, second current regulating resistor 206, third linear constant current chip 207, third current regulating resistor 208, diode 209, first LED light string 210, second LED light string 211 and The current regulation resistor 212 is maintained.
其中，可控硅调光器201与交流输入电压源电学串联；整流桥202的两个输入端分别与可控硅调光器201和交流输入电压源电学连接；第一线性恒流芯片203的OUT端与整流桥202的正输出端电学连接；第一电流调节电阻204的一端与第一线性恒流芯片203的REXT端电学连接；第一电流调节电阻204的另一端分别与第一线性恒流芯片203的GND端、第二线性恒流芯片205的OUT端和第一LED灯串210的正端电学连接；第二线性恒流芯片205的REXT端分别与第二电流调节电阻206的一端、二极管309的阴极、维持电流调节电阻212的一端电学连接；第二线性恒流芯片205的GND端分别与第二电流调节电阻206的另一端、第二LED灯串211的正端电学连接；第一LED灯串210的负端分别与二极管209的阳极、维持电流调节电阻212的另一端和第三线性恒流芯片207的OUT端电学连接；第三线性恒流芯片207的REXT端分别与第三电流调节电阻208的一端、第二LED灯串211的负端电学连接；第三线性恒流芯片207的GND端分别与第三电流调节电阻208的另一端、整流桥202的输出负端电学连接。Wherein, the thyristor dimmer 201 is electrically connected in series with the AC input voltage source; the two input ends of the rectifier bridge 202 are respectively electrically connected with the thyristor dimmer 201 and the AC input voltage source; the first linear constant current chip 203 The OUT end is electrically connected to the positive output end of the rectifier bridge 202; one end of the first current adjusting resistor 204 is electrically connected to the REXT end of the first linear constant current chip 203; the other end of the first current adjusting resistor 204 is respectively connected to the first linear constant current chip 203 The GND end of the flow chip 203, the OUT end of the second linear constant current chip 205 and the positive end of the first LED light string 210 are electrically connected; the REXT end of the second linear constant current chip 205 is connected to one end of the second current regulating resistor 206 1. The cathode of the diode 309 is electrically connected to one end of the maintaining current adjusting resistor 212; the GND end of the second linear constant current chip 205 is respectively electrically connected to the other end of the second current adjusting resistor 206 and the positive end of the second LED light string 211; The negative end of the first LED light string 210 is electrically connected to the anode of the diode 209, the other end of the maintaining current regulating resistor 212, and the OUT end of the third linear constant current chip 207; the REXT end of the third linear constant current chip 207 is respectively connected to One end of the third current adjusting resistor 208 is electrically connected to the negative end of the second LED lamp string 211; electrical connection.
在本实施例中第一线性恒流芯片203、第二线性恒流芯片205和第三线性恒流芯片207均为单通道线性恒流控制芯片，可采用型号为CL1570或类似功能芯片。该芯片有三个功能脚，分别是：OUT端，为芯片电源供电与恒流输出端口；GND端，为芯片接地端；REXT端，为芯片输出电流设置端。In this embodiment, the first linear constant current chip 203 , the second linear constant current chip 205 and the third linear constant current chip 207 are single-channel linear constant current control chips, which can be CL1570 or similar function chips. The chip has three function pins, which are: OUT port, which is the chip power supply and constant current output port; GND port, which is the chip grounding port; REXT port, which is the chip output current setting port.
本实施例中第一LED灯串210和第二LED灯串211所串入LED灯的型号、数量完全相同，每串灯串的导通压降记做VLED。当电路开始工作时，所有灯串的亮度都能做到一致，不会出现可控硅调光时，灯串亮度不一的问题。如图4所示，当母线电压VLINE高于1个灯串的压降VLED而低于两个灯串串联的压降2*VLED时，第一线性恒流芯片203直通，即可视为导线，第一LED灯串210和第二LED灯串211并联点亮；流经第一LED灯串211的电流ILED2的大小由第二线性恒流芯片205和第二电流调节电阻206决定，并联总电流ISTEP1的大小由第三线性恒流芯片207和第三电流调节电阻208决定；如果要使得流经第一LED灯串210的电流ILED1与流经第二LED灯串211的电流ILED2的大小相等，第二电流调节电阻206的阻值取第三电流调节电阻208阻值的两倍。In this embodiment, the models and numbers of LED lights connected in the first LED light string 210 and the second LED light string 211 are exactly the same, and the conduction voltage drop of each light string is recorded as V LED . When the circuit starts to work, the brightness of all the light strings can be consistent, and there will be no problem of uneven brightness of the light strings when the thyristor is dimmed. As shown in Figure 4, when the bus voltage V LINE is higher than the voltage drop V LED of one light string and lower than the voltage drop 2*V LED of two light strings connected in series, the first linear constant current chip 203 is directly connected, that is, As a wire, the first LED lamp string 210 and the second LED lamp string 211 are lit in parallel; It is determined that the size of the total parallel current I STEP1 is determined by the third linear constant current chip 207 and the third current regulating resistor 208; if the current I LED1 flowing through the first LED light string 210 is to be The magnitude of the current I LED2 is equal, and the resistance value of the second current regulating resistor 206 is twice the resistance value of the third current regulating resistor 208 .
如图5所示，当母线电压VLINE高于两个灯串串联的压降2*VLED时，第二线性恒流芯片205和第三线性恒流芯片207不工作，第一LED灯串210和第二LED灯串211串联点亮；第一LED灯串210的电流ILED1与流经第二LED灯串211的电流ILED2的大小相等，都为串联总电流ISTEP2的大小；ISTEP2的大小由第一线性恒流芯片203和第一电流调节电阻204决定；第一电流调节电阻204的阻值要小于第三电流调节电阻208的阻值。维持电流调节电阻212主要用于提供可控硅调光器201进行调光的维持电流，维持电流调节电阻212取值视具体的可控硅调光器而有所不同，一般可取在10KΩ至33KΩ之间。第一电流调节电阻204、第二电流调节电阻206和第三电流调节电阻208的取值主要由设计功率和设计的输出电流决定。As shown in Figure 5, when the bus voltage V LINE is higher than the voltage drop 2*V LED of the two strings connected in series, the second linear constant current chip 205 and the third linear constant current chip 207 do not work, and the first LED lamp string 210 and the second LED lamp string 211 are lit in series; the current I LED1 of the first LED lamp string 210 is equal to the magnitude of the current I LED2 flowing through the second LED lamp string 211, and both are the size of the total series current I STEP2 ; I The size of STEP2 is determined by the first linear constant current chip 203 and the first current regulating resistor 204 ; the resistance of the first current regulating resistor 204 is smaller than the resistance of the third current regulating resistor 208 . The holding current adjusting resistor 212 is mainly used to provide the holding current for the thyristor dimmer 201 to perform dimming. The value of the holding current adjusting resistor 212 varies depending on the specific thyristor dimmer, and generally it is desirable to be between 10KΩ and 33KΩ between. The values of the first current regulating resistor 204 , the second current regulating resistor 206 and the third current regulating resistor 208 are mainly determined by the designed power and the designed output current.
如图6所示，整个实施电路可以获得很高的功率因数，整个电路的效率可到85％以上，功率因数可达到0.97以上。As shown in Figure 6, the entire implementation circuit can obtain a very high power factor, the efficiency of the entire circuit can reach more than 85%, and the power factor can reach more than 0.97.
如图7所示，当本实施例的输入条件与图1所示的目前市场现有的应用电路的输入条件相同时，第一LED灯串210与第二LED灯串211所串入的LED灯的型号、数量总和与图1所示的目前市场现有的应用电路中的LED灯串105相同时，本实施例的调光范围超过了现有电路的一倍。As shown in FIG. 7, when the input conditions of this embodiment are the same as those of the existing application circuit in the market shown in FIG. When the type and quantity of lamps are the same as the LED lamp string 105 in the current market application circuit shown in FIG. 1 , the dimming range of this embodiment is more than double that of the existing circuit.
实施例2：Example 2:
如图8所示，本发明提供了一种用于可控硅调光的线性恒流电路，包括可控硅调光器201、整流桥202、第一线性恒流芯片203、第一电流调节电阻204、第二线性恒流芯片205、第二电流调节电阻206、第三线性恒流芯片207、第三电流调节电阻208、二极管209、第一LED灯串210、第二LED灯串211、维持电流调节电阻212和维持电流控制芯片213。As shown in Figure 8, the present invention provides a linear constant current circuit for thyristor dimming, including a thyristor dimmer 201, a rectifier bridge 202, a first linear constant current chip 203, a first current regulator Resistor 204, second linear constant current chip 205, second current regulating resistor 206, third linear constant current chip 207, third current regulating resistor 208, diode 209, first LED light string 210, second LED light string 211, The sustain current regulating resistor 212 and the sustain current control chip 213 .
可控硅调光器201与交流输入电压源电学串联；整流桥202的两个输入端分别与可控硅调光器201和交流输入电压源电学连接；第一线性恒流芯片203的OUT端与整流桥202的正输出端电学连接；第一电流调节电阻204的一端分别与第一线性恒流芯片203的REXT端、维持电流控制芯片213的OUT端电学连接；第一电流调节电阻204的另一端分别与第一线性恒流芯片203的GND端、第二线性恒流芯片205的OUT端和第一LED灯串210的正端电学连接；第二线性恒流芯片205的REXT端分别与第二电流调节电阻206的一端和二极管209的阴极电学连接；第二线性恒流芯片205的GND端分别与第二电流调节电阻206的另一端、第二LED灯串211的正端电学连接；第一LED灯串210的负端分别与二极管209的阳极和第三线性恒流芯片207的OUT端电学连接；第三线性恒流芯片207的REXT端分别与第三电流调节电阻208的一端、第二LED灯串211的负端电学连接；第三线性恒流芯片207的GND端分别与第三电流调节电阻208的另一端、维持电流控制芯片213的REXT端和维持电流调节电阻212的一端电学连接；维持电流控制芯片213的GND端分别与维持电流调节电阻212的另一端和整流桥202的输出负端电学连接。The thyristor dimmer 201 is electrically connected in series with the AC input voltage source; the two input ends of the rectifier bridge 202 are respectively electrically connected with the thyristor dimmer 201 and the AC input voltage source; the OUT end of the first linear constant current chip 203 It is electrically connected with the positive output end of the rectifier bridge 202; one end of the first current adjustment resistor 204 is electrically connected with the REXT end of the first linear constant current chip 203 and the OUT end of the maintenance current control chip 213 respectively; The other end is electrically connected to the GND end of the first linear constant current chip 203, the OUT end of the second linear constant current chip 205, and the positive end of the first LED light string 210; the REXT end of the second linear constant current chip 205 is respectively connected to One end of the second current adjusting resistor 206 is electrically connected to the cathode of the diode 209; the GND end of the second linear constant current chip 205 is respectively electrically connected to the other end of the second current adjusting resistor 206 and the positive end of the second LED lamp string 211; The negative end of the first LED light string 210 is electrically connected to the anode of the diode 209 and the OUT end of the third linear constant current chip 207; the REXT end of the third linear constant current chip 207 is respectively connected to one end of the third current regulating resistor 208, The negative end of the second LED lamp string 211 is electrically connected; the GND end of the third linear constant current chip 207 is respectively connected to the other end of the third current regulating resistor 208, the REXT end of the maintaining current control chip 213 and one end of maintaining the current regulating resistor 212 Electrical connection: the GND end of the maintaining current control chip 213 is electrically connected to the other end of the maintaining current regulating resistor 212 and the output negative end of the rectifier bridge 202 .
实施例2中采用的电路与实施例1中采用的电路的工作原理与工作过程均相同，使两组LED灯串能根据输入电压的高低自适应的在串联方式和并联方式中进行自动切换。在此不再赘述。在实施例2中利用维持电流控制芯片213和维持电流调节电阻212组合提供可控硅调光所需的维持电流。这样对可控硅调光器201的调光效果有所增强。这样能够提供更大的维持电流，同时能兼容更多不同型号的可控硅调光器和更宽的输入功率范围。The working principle and working process of the circuit adopted in embodiment 2 are the same as those adopted in embodiment 1, so that two groups of LED light strings can automatically switch between series mode and parallel mode according to the level of input voltage. I won't repeat them here. In Embodiment 2, the combination of the sustain current control chip 213 and the sustain current adjusting resistor 212 is used to provide the sustain current required by the thyristor for dimming. In this way, the dimming effect of the thyristor dimmer 201 is enhanced. In this way, a larger holding current can be provided, and at the same time, it can be compatible with more different types of thyristor dimmers and a wider input power range.
在本实施例中第一线性恒流芯片203、第二线性恒流芯片205、第三线性恒流芯片207和维持电流控制芯片213均为单通道线性恒流控制芯片，可采用型号为CL1570或类似功能芯片。该芯片有三个功能脚，分别是：OUT脚，为芯片电源供电与恒流控制端口；GND脚，为芯片接地端；REXT脚，为芯片输出电流设置端。In this embodiment, the first linear constant current chip 203, the second linear constant current chip 205, the third linear constant current chip 207 and the maintenance current control chip 213 are all single-channel linear constant current control chips, and the model can be CL1570 or Similar function chip. The chip has three functional pins, namely: OUT pin, which is the chip power supply and constant current control port; GND pin, which is the chip ground terminal; REXT pin, which is the chip output current setting terminal.
本发明提供的可控硅调光的LED灯串串并联自适应切换的线性恒流电路可达到增大可控硅调光的调光范围的目的，且不会增大电路损耗、有效降低了转换效率。The linear constant current circuit for series-parallel adaptive switching of the thyristor dimming LED lamp strings provided by the present invention can achieve the purpose of increasing the dimming range of thyristor dimming without increasing circuit loss and effectively reducing the conversion efficiency.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be considered Be the protection scope of the present invention.
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| CN108811233A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | Low harmonic distortion light emitting diode driving circuit |
| US10694595B2 (en) | 2017-05-05 | 2020-06-23 | Edison Opto (Dongguan) Co., Ltd. | Light emitting diode driving circuit with low harmonic distortion |
| CN107660019A (en) * | 2017-08-31 | 2018-02-02 | 开发晶照明（厦门）有限公司 | Light source and light emitting module |
| CN116600433A (en) * | 2023-06-12 | 2023-08-15 | 深圳市斯迈得半导体有限公司 | Linear silicon controlled rectifier dimming full-voltage constant-power input line |
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| CN105792441B (en) | 2018-02-23 |
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