CN110913525B - Double-bus lighting circuit with adjustable color temperature - Google Patents
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Abstract
本发明公开了一种双母线可调色温照明电路，包括3个PWM芯片以及可调的双母线电压；当调节直流母线电压A和直流母线电压B的大小和比值时，通过分压电阻R1、分压电阻R3、分压电阻R5、分压电阻R6、分压电阻R9、分压电阻R11、分压电阻R12以及分压电阻R13的分压使PWM芯片U1和PWM芯片U3的线性调光接收脚LD脚的电位发生变化，从而改变红色LED和绿色LED的电流变化，根据色彩的混合原理从而改变整改LED的色温。本发明省掉调色温控制电路，降低成本，安装施工方便，可靠性高。通过直接调节双母线的电压比例来控制红色LED和绿色LED电流比例，从而来精确调节色温。实现精确调节色温，可靠性高，可实现远距离调色温和亮度，提升LED路灯的光照效果和视觉舒适度。
The invention discloses a double busbar adjustable color temperature lighting circuit, which includes three PWM chips and adjustable double busbar voltage; , voltage dividing resistor R3, voltage dividing resistor R5, voltage dividing resistor R6, voltage dividing resistor R9, voltage dividing resistor R11, voltage dividing resistor R12 and voltage dividing resistor R13 divide the voltage to make PWM chip U1 and PWM chip U3 linear dimming The potential of the receiving pin LD changes, thereby changing the current changes of the red LED and the green LED, and changing the color temperature of the rectification LED according to the color mixing principle. The invention saves the color temperature control circuit, reduces the cost, is convenient for installation and construction, and has high reliability. By directly adjusting the voltage ratio of the dual bus bars to control the red LED and green LED current ratio, the color temperature can be precisely adjusted. To achieve precise adjustment of color temperature, high reliability, long-distance color matching temperature and brightness can be achieved, and the lighting effect and visual comfort of LED street lamps can be improved.
Description
【技术领域】【Technical field】
本发明属于道路照明技术领域，涉及一种双母线可调色温照明电路。The invention belongs to the technical field of road lighting, and relates to a double busbar adjustable color temperature lighting circuit.
【背景技术】【Background technique】
随着白光LED技术的迅速发展，LED照明正逐步进入了各个应用领域，尤其是LED发光效率超越白炽灯及荧光灯后，LED照明正逐步以其显着的节能优势拓展到占全球电力消耗2成的普通照明领域。目前，全球LED的市场超过100亿美元，并以年均增长率超过20％发展起来一个新型的“绿色照明”工业。With the rapid development of white LED technology, LED lighting is gradually entering various application fields, especially after the luminous efficiency of LED surpasses that of incandescent lamps and fluorescent lamps, LED lighting is gradually expanding to account for 20% of global electricity consumption due to its significant energy-saving advantages. of general lighting. At present, the global LED market exceeds 10 billion US dollars, and a new "green lighting" industry has developed with an average annual growth rate of more than 20%.
目前，在LED照明中，白光LED的发光效率、配光设计、光衰等问题都已得到了很好地改善。但在LED显色指数、色温及对人视觉能力的影响方面，由于目前以InGaNa蓝色LED芯片为基础光源激发稀土石榴石黄色荧光粉的混色方法所限，在作为普通照明光源的白光LED的光谱、色品坐标、相关色温及显色指数等均很难符合现行的CIE及我国的相关标准。At present, in LED lighting, the luminous efficiency, light distribution design, light decay and other issues of white LEDs have been well improved. However, in terms of LED color rendering index, color temperature and the impact on human visual ability, due to the limitation of the color mixing method of rare earth garnet yellow phosphors excited by the current InGaNa blue LED chip as the basic light source, in the white LED as a general lighting source Spectrum, chromaticity coordinates, correlated color temperature and color rendering index are difficult to meet the current CIE and my country's relevant standards.
从LED发光光谱上来分析，由于此种混色方案中，蓝光光谱过高而红光光谱的偏少，使得此类白光LED色温只能是5000K以上的高色温光源，低显色性的。日前主流白光LED色温主要集中在5600-6500K。From the analysis of the LED luminescence spectrum, because the blue light spectrum is too high and the red light spectrum is too small in this color mixing scheme, the color temperature of this type of white LED can only be a high color temperature light source above 5000K and low color rendering. Recently, the color temperature of mainstream white LEDs is mainly concentrated in 5600-6500K.
目前现有技术主要采用以下两种方案：At present, the existing technology mainly adopts the following two schemes:
(1)通过控制电路调节工作电流调节色温；通过单独的控制电路对红、绿、蓝三基色LED组合发射的白光，调节红、绿、蓝的工作电流可以使显色发生变化来调节色温；方法控制电路复杂，成本高需要单独的调色温控制线。(1) Adjust the color temperature by adjusting the working current through the control circuit; adjust the working current of red, green and blue for the white light emitted by the combination of red, green and blue LEDs through a separate control circuit to change the color rendering to adjust the color temperature; The control circuit of the method is complex, and the cost is high, and a separate color temperature control line is required.
(2)通过滤光片改变色温，加入降色温滤光片来降低色温。方法只能降低色温不能调节。(2) Change the color temperature through a filter, and add a color temperature reduction filter to reduce the color temperature. The method can only reduce the color temperature and cannot adjust it.
【发明内容】[Content of the invention]
本发明的目的在于解决现有技术中控制电路复杂，且只能降低色温不能调节.的问题，提供一种双母线可调色温照明电路，该方法应用在DC供电的户外LED照明的驱动电源和室内LED照明的驱动电源，用于调节改善LED光源的色温。The purpose of the present invention is to solve the problem that the control circuit in the prior art is complicated, and the color temperature cannot be adjusted, and a dual busbar adjustable color temperature lighting circuit is provided, and the method is applied to the driving power supply of DC-powered outdoor LED lighting. And the driving power of indoor LED lighting, used to adjust and improve the color temperature of LED light source.
为达到上述目的，本发明采用以下技术方案予以实现：To achieve the above object, the present invention adopts the following technical solutions to realize:
一种双母线可调色温照明电路，包括以下步骤：A dual busbar adjustable color temperature lighting circuit, comprising the following steps:
直流母线电压A，所述直流母线电压A的正极VA+分别接LED灯板的红色LED串的正极V-RLED+和LED灯板的白色LED串的正极V-WLED+；直流母线电压A的负极VA-接地；The DC bus voltage A, the positive electrode VA+ of the DC bus voltage A is respectively connected to the positive electrode V-RLED+ of the red LED string of the LED light panel and the positive electrode V-WLED+ of the white LED string of the LED light panel; the negative electrode VA- of the DC bus voltage A ground;
PWM芯片U1，所述PWM芯片U1的供电脚VIN接直流母线电压A的正极VA+，PWM输出脚GATE接场效应开关管Q1的G极，线性调光接收脚LD经分压电阻接直流母线电压A的正极VA+；PWM chip U1, the power supply pin VIN of the PWM chip U1 is connected to the positive pole VA+ of the DC bus voltage A, the PWM output pin GATE is connected to the G pole of the field effect switch Q1, and the linear dimming receiving pin LD is connected to the DC bus voltage through a voltage divider resistor. A's positive VA+;
场效应开关管Q1，所述场效应开关管Q1的D极接储能电感L1的一端，储能电感L1的另一端接LED灯板的红色LED串的负极V-RLED-；场效应开关管Q1的S极接地；The field effect switch tube Q1, the D pole of the field effect switch tube Q1 is connected to one end of the energy storage inductor L1, and the other end of the energy storage inductor L1 is connected to the negative electrode V-RLED- of the red LED string of the LED light board; the field effect switch tube The S pole of Q1 is grounded;
PWM芯片U2，所述PWM芯片U2的供电脚VIN接直流母线电压A的正极VA+，PWM输出脚GATE接场效应开关管Q2的G极；PWM chip U2, the power supply pin VIN of the PWM chip U2 is connected to the positive pole VA+ of the DC bus voltage A, and the PWM output pin GATE is connected to the G pole of the field effect switch tube Q2;
场效应开关管Q2，所述场效应开关管Q2的D极储能电感L2的一端，储能电感L2的另一端接LED灯板的白色LED串的负极V-WLED-；场效应开关管Q2的S极接地；The field effect switch tube Q2, one end of the D pole energy storage inductor L2 of the field effect switch tube Q2, and the other end of the energy storage inductor L2 is connected to the negative electrode V-WLED- of the white LED string of the LED light board; the field effect switch tube Q2 The S pole is grounded;
直流母线电压B，所述直流母线电压B的正极VB+分别接LED灯板的绿色LED串的正极V-GLED+和LED灯板的白色LED串的正极V-WLED+；直流母线电压B的负极VA-接地；The DC bus voltage B, the positive pole VB+ of the DC bus voltage B is respectively connected to the positive pole V-GLED+ of the green LED string of the LED light board and the positive pole V-WLED+ of the white LED string of the LED light board; the negative pole VA- of the DC bus voltage B ground;
PWM芯片U3，所述PWM芯片U3的供电脚VIN接直流母线电压B的正极VB+，PWM输出脚GBTE接场效应开关管Q3的G极，线性调光接收脚LD经分压电阻接直流母线电压B的正极VB+；PWM chip U3, the power supply pin VIN of the PWM chip U3 is connected to the positive pole VB+ of the DC bus voltage B, the PWM output pin GBTE is connected to the G pole of the field effect switch Q3, and the linear dimming receiving pin LD is connected to the DC bus voltage through a voltage divider resistor. The positive VB+ of B;
场效应开关管Q3，所述场效应开关管Q3的D极接储能电感L3的一端，储能电感L3的另一端接LED灯板的绿色LED串的负极V-GLED-；场效应开关管Q3的S极接地。The field effect switch tube Q3, the D pole of the field effect switch tube Q3 is connected to one end of the energy storage inductor L3, and the other end of the energy storage inductor L3 is connected to the negative electrode V-GLED- of the green LED string of the LED light board; the field effect switch tube The S pole of Q3 is grounded.
本发明进一步的改进在于：The further improvement of the present invention is:
所述PWM芯片U1的分压电阻包括分压电阻R1、分压电阻R3、分压电阻R5和分压电阻R6；分压电阻R1的一端与直流母线电压A的正极VA+，另一端依次分压电阻R3和分压电阻R5，分压电阻R5的另一端分别接分压电阻R6和PWM芯片U1的线性调光接收脚LD，分压电阻R6的另一端接地。The voltage dividing resistor of the PWM chip U1 includes a voltage dividing resistor R1, a voltage dividing resistor R3, a voltage dividing resistor R5 and a voltage dividing resistor R6; one end of the voltage dividing resistor R1 is connected to the positive electrode VA+ of the DC bus voltage A, and the other end is divided in sequence. Resistor R3 and voltage dividing resistor R5, the other end of the voltage dividing resistor R5 is respectively connected to the voltage dividing resistor R6 and the linear dimming receiving pin LD of the PWM chip U1, and the other end of the voltage dividing resistor R6 is grounded.
所述PWM芯片U1的供电脚VIN通过启动电阻R2接直流母线电压A的正极VA+。The power supply pin VIN of the PWM chip U1 is connected to the positive electrode VA+ of the DC bus voltage A through the starting resistor R2.
所述场效应开关管Q1的D极还连接续流二极管D1的阳极，续流二极管D1的阴极接直流母线电压A的正极VA+。The D pole of the FET Q1 is also connected to the anode of the freewheeling diode D1, and the cathode of the freewheeling diode D1 is connected to the positive pole VA+ of the DC bus voltage A.
所述PWM芯片U2的供电脚VIN通过启动电阻R4接直流母线电压A的正极VA+。The power supply pin VIN of the PWM chip U2 is connected to the positive electrode VA+ of the DC bus voltage A through the starting resistor R4.
所述场效应开关管Q2的D极还连接续流二极管D2的阳极，续流二极管D2的阴极接直流母线电压A的正极VA+。The D pole of the FET Q2 is also connected to the anode of the freewheeling diode D2, and the cathode of the freewheeling diode D2 is connected to the positive pole VA+ of the DC bus voltage A.
所述PWM芯片U2的分压电阻包括分压电阻R9、分压电阻R11、分压电阻R12和分压电阻R13；分压电阻R9的一端与直流母线电压B的正极VB+，另一端依次分压电阻R11和分压电阻R12，分压电阻R12的另一端分别接分压电阻R13和PWM芯片U2的线性调光接收脚LD，分压电阻R13的另一端接地。The voltage dividing resistor of the PWM chip U2 includes a voltage dividing resistor R9, a voltage dividing resistor R11, a voltage dividing resistor R12 and a voltage dividing resistor R13; one end of the voltage dividing resistor R9 is connected to the positive electrode VB+ of the DC bus voltage B, and the other end is divided in sequence. Resistor R11 and voltage dividing resistor R12, the other end of the voltage dividing resistor R12 is respectively connected to the voltage dividing resistor R13 and the linear dimming receiving pin LD of the PWM chip U2, and the other end of the voltage dividing resistor R13 is grounded.
所述PWM芯片U3的供电脚VIN通过启动电阻R10接直流母线电压B的正极VA+。The power supply pin VIN of the PWM chip U3 is connected to the positive electrode VA+ of the DC bus voltage B through the starting resistor R10.
所述场效应开关管Q3的D极还连接续流二极管D3的阳极，续流二极管D3的阴极接直流母线电压B的正极VB+。The D pole of the field effect switch tube Q3 is also connected to the anode of the freewheeling diode D3, and the cathode of the freewheeling diode D3 is connected to the positive pole VB+ of the DC bus voltage B.
还包括退耦滤波电容C1、滤波电容C2、滤波电容C3、退耦滤波电容C4以及滤波电容C5；Also includes decoupling filter capacitor C1, filter capacitor C2, filter capacitor C3, decoupling filter capacitor C4 and filter capacitor C5;
所述退耦滤波电容C1的正极接直流母线电压A的正极VA+，负极接直流母线电压A的负极VA-；The positive pole of the decoupling filter capacitor C1 is connected to the positive pole VA+ of the DC bus voltage A, and the negative pole is connected to the negative pole VA- of the DC bus voltage A;
所述滤波电容C2的正极接LED灯板的红色LED串的正极V-RLED+，负极接LED灯板的红色LED串的负极V-RLED-；The positive electrode of the filter capacitor C2 is connected to the positive electrode V-RLED+ of the red LED string of the LED light board, and the negative electrode is connected to the negative electrode V-RLED- of the red LED string of the LED light board;
所述滤波电容C3的正极接LED灯板的白色LED串的正极V-WLED+，负极接LED灯板的白色LED串的负极V-WLED-；The positive electrode of the filter capacitor C3 is connected to the positive electrode V-WLED+ of the white LED string of the LED light board, and the negative electrode is connected to the negative electrode V-WLED- of the white LED string of the LED light board;
所述退耦滤波电容C4的正极接直流母线电压B的正极VB+，负极接直流母线电压B的负极VB-；The positive pole of the decoupling filter capacitor C4 is connected to the positive pole VB+ of the DC bus voltage B, and the negative pole is connected to the negative pole VB- of the DC bus voltage B;
所述滤波电容C5的正极接LED灯板的绿色LED串的正极V-GLED+，负极接LED灯板的绿色LED串的负极V-GLED-。The positive electrode of the filter capacitor C5 is connected to the positive electrode V-GLED+ of the green LED string of the LED light board, and the negative electrode is connected to the negative electrode V-GLED- of the green LED string of the LED light board.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明省掉调色温控制电路，降低成本，安装施工方便，可靠性高。通过直接调节双母线的电压比例来控制红色LED和绿色LED电流比例，从而来精确调节色温。实现精确调节色温，可靠性高，可实现远距离调色温和亮度，提升LED路灯的光照效果和视觉舒适度。The invention saves the color temperature control circuit, reduces the cost, is convenient for installation and construction, and has high reliability. By directly adjusting the voltage ratio of the dual bus bars to control the red LED and green LED current ratio, the color temperature can be precisely adjusted. To achieve precise adjustment of color temperature, high reliability, long-distance color matching temperature and brightness can be achieved, and the lighting effect and visual comfort of LED street lamps can be improved.
【附图说明】【Description of drawings】
图1为本发明的电路原理图。FIG. 1 is a circuit schematic diagram of the present invention.
【具体实施方式】【Detailed ways】
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，不是全部的实施例，而并非要限制本发明公开的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要的混淆本发明公开的概念。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are part of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
在附图中示出了根据本发明公开实施例的各种结构示意图。这些图并非是按比例绘制的，其中为了清楚表达的目的，放大了某些细节，并且可能省略了某些细节。图中所示出的各种区域、层的形状及它们之间的相对大小、位置关系仅是示例性的，实际中可能由于制造公差或技术限制而有所偏差，并且本领域技术人员根据实际所需可以另外设计具有不同形状、大小、相对位置的区域/层。Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not to scale, some details have been exaggerated for clarity, and some details may have been omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.
本发明公开的上下文中，当将一层/元件称作位于另一层/元件“上”时，该层/元件可以直接位于该另一层/元件上，或者它们之间可以存在居中层/元件。另外，如果在一种朝向中一层/元件位于另一层/元件“上”，那么当调转朝向时，该层/元件可以位于该另一层/元件“下”。In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present therebetween. element. In addition, if a layer/element is "on" another layer/element in one orientation, then when the orientation is reversed, the layer/element can be "under" the other layer/element.
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.
下面结合附图对本发明做进一步详细描述：Below in conjunction with accompanying drawing, the present invention is described in further detail:
参见图1，本发明双母线可调色温照明电路，包括直流母线电压A和直流母线电压B为可调的双母线电压，VA+为直流母线电压A的正极，VA-为直流母线电压A的负极，VB+为直流母线电压B的正极，VB-为直流母线电压B的负极；Referring to Figure 1, the dual-busbar adjustable color temperature lighting circuit of the present invention includes a DC busbar voltage A and a DC busbar voltage B, which are adjustable dual-busbar voltages, VA+ is the positive pole of the DC busbar voltage A, and VA- is the DC busbar voltage A. Negative pole, VB+ is the positive pole of the DC bus voltage B, VB- is the negative pole of the DC bus voltage B;
直流母线电压A的负极VA-接到直流母线电压B的负极VB-，退耦滤波电容C1正极接直流母线电压A的正极VA+，退耦滤波电容C1负极接直流母线电压A的负极VA-，分压电阻R1一端接直流母线电压A的正极VA+，分压电阻R1另一端接分压电阻R3一端，分压电阻R3另一端接分压电阻R5一端，分压电阻R5另一端接分压电阻R6一端同时连接到PWM芯片U1的线性调光接收脚LD脚，分压电阻R6另一端接到地，启动电阻R2一端接直流母线电压A的正极VA+，启动电阻R2另一端接PWM芯片U1的供电脚VIN脚，续流二极管D1阴极接直流母线电压A的正极VA+，续流二极管D1阳极接储能电感D1的一端同时接场效应管场效应开关管Q1的D极，储能电感D1的另一端接滤波电容C2负极同时接LED灯板的红色LED串的负极V-RLED-，滤波电容C2的正极接续流二极管D1的阴极同时接LED灯板的红色LED串的正极V-RLED+，场效应管场效应开关管Q1的G极接PWM芯片U1的PWM输出脚GATE脚，场效应管场效应开关管Q1的S极接恒流检测电阻R7的一端端同时接PWM芯片U1的电流检测脚CS脚，恒流检测电阻R7的另一端接地。The negative electrode VA- of DC bus voltage A is connected to the negative electrode VB- of DC bus voltage B, the positive electrode of decoupling filter capacitor C1 is connected to the positive electrode VA+ of DC bus voltage A, the negative electrode of decoupling filter capacitor C1 is connected to the negative electrode VA- of DC bus voltage A, One end of the voltage dividing resistor R1 is connected to the positive electrode VA+ of the DC bus voltage A, the other end of the voltage dividing resistor R1 is connected to one end of the voltage dividing resistor R3, the other end of the voltage dividing resistor R3 is connected to one end of the voltage dividing resistor R5, and the other end of the voltage dividing resistor R5 is connected to the voltage dividing resistor. One end of R6 is connected to the linear dimming receiving pin LD of the PWM chip U1 at the same time, the other end of the voltage dividing resistor R6 is connected to the ground, one end of the starting resistor R2 is connected to the positive VA+ of the DC bus voltage A, and the other end of the starting resistor R2 is connected to the PWM chip U1. The power supply pin VIN pin, the cathode of the freewheeling diode D1 is connected to the positive pole VA+ of the DC bus voltage A, the anode of the freewheeling diode D1 is connected to one end of the energy storage inductor D1 and the D pole of the FET field effect switch tube Q1, the energy storage inductor D1 The other end is connected to the negative electrode of the filter capacitor C2 and the negative electrode of the red LED string of the LED light board V-RLED-, the positive electrode of the filter capacitor C2 is connected to the negative electrode of the freewheeling diode D1 and the positive electrode of the red LED string of the LED light board V-RLED+, the field The G pole of the field effect switch transistor Q1 is connected to the PWM output pin GATE pin of the PWM chip U1, and the S pole of the field effect transistor field effect switch transistor Q1 is connected to one end of the constant current detection resistor R7 and the current detection pin of the PWM chip U1. CS pin, the other end of constant current detection resistor R7 is grounded.
退耦滤波电容C4正极接直流母线电压B的正极VB+，退耦滤波电容C4负极接直流母线电压B的负极VB-，分压电阻R9一端接直流母线电压B的正极VB+，分压电阻R9另一端接分压电阻R11一端，分压电阻R11另一端接分压电阻R12一端，分压电阻R12另一端接分压电阻R13一端同时连接到PWM芯片U3的线性调光接收脚LD脚，分压电阻R13另一端接到地，分压电阻R10一端接直流母线电压B的正极VB+，分压电阻R10另一端接PWM芯片U3的供电脚VIN脚，续流二极管D3阴极接直流母线电压B的正极VB+，续流二极管D3阳极接储能电感L3的一端同时接场效应管场效应开关管Q3的D极，储能电感L3的另一端接滤波电容C5负极同时接LED灯板的绿色LED串的负极V-GLED-，滤波电容C5的正极接续流二极管D3的阴极同时接LED灯板的绿色LED串的正极V-GLED+，场效应管场效应开关管Q3的G极接PWM芯片U3的PWM输出脚GATE脚，场效应管场效应开关管Q3的S极接恒流检测电阻R14的一端端同时接PWM芯片U3的电流检测脚CS脚，恒流检测电阻R14的另一端接地。The positive pole of the decoupling filter capacitor C4 is connected to the positive pole VB+ of the DC bus voltage B, the negative pole of the decoupling filter capacitor C4 is connected to the negative pole VB- of the DC bus voltage B, one end of the voltage dividing resistor R9 is connected to the positive pole VB+ of the DC bus voltage B, and the other end of the voltage dividing resistor R9 One end is connected to one end of the voltage divider resistor R11, the other end of the voltage divider resistor R11 is connected to one end of the voltage divider resistor R12, the other end of the voltage divider resistor R12 is connected to the other end of the voltage divider resistor R13 and one end is connected to the linear dimming receiving pin LD of the PWM chip U3, the voltage divider The other end of the resistor R13 is connected to the ground, one end of the voltage dividing resistor R10 is connected to the positive electrode VB+ of the DC bus voltage B, the other end of the voltage dividing resistor R10 is connected to the VIN pin of the PWM chip U3, and the cathode of the freewheeling diode D3 is connected to the positive electrode of the DC bus voltage B. VB+, the anode of the freewheeling diode D3 is connected to one end of the energy storage inductor L3 and the D pole of the field effect switch Q3, the other end of the energy storage inductor L3 is connected to the negative electrode of the filter capacitor C5 and the green LED string of the LED light board is connected. The negative pole V-GLED-, the positive pole of the filter capacitor C5 is connected to the cathode of the freewheeling diode D3 and the positive pole V-GLED+ of the green LED string of the LED light board, and the G pole of the FET field effect switch tube Q3 is connected to the PWM output of the PWM chip U3 Pin GATE pin, the S pole of the FET field effect switch Q3 is connected to one end of the constant current detection resistor R14 and the current detection pin CS pin of the PWM chip U3, and the other end of the constant current detection resistor R14 is grounded.
启动电阻R4一端接直流母线电压A的正极VA+，启动电阻R4另一端接PWM芯片U2的供电脚VIN脚，续流二极管D2阴极接直流母线电压A的正极VA+，续流二极管D2的阳极接储能电感L2的一端同时接场效应管场效应开关管Q2的D极，储能电感L2另一端接滤波电容C3的负极同时接LED灯板的白色LED串的负极V-WLED-，滤波电容C3的正极接续流二极管D2的阴极同时接LED灯板的白色LED串的正极V-WLED+，场效应管场效应开关管Q2的G极接PWM芯片U2的PWM输出脚GATE脚，场效应管场效应开关管Q2的S极接恒流检测电阻R8的一端同时接PWM芯片U2的电流检测脚CS脚，恒流检测电阻R8另一端接地。One end of the starting resistor R4 is connected to the positive electrode VA+ of the DC bus voltage A, the other end of the starting resistor R4 is connected to the VIN pin of the PWM chip U2, the cathode of the freewheeling diode D2 is connected to the positive electrode VA+ of the DC bus voltage A, and the anode of the freewheeling diode D2 is connected to the storage One end of the energy inductance L2 is connected to the D pole of the FET field effect switch Q2 at the same time, the other end of the energy storage inductance L2 is connected to the negative electrode of the filter capacitor C3 and the negative electrode V-WLED- of the white LED string of the LED light board is connected, and the filter capacitor C3 The positive pole is connected to the cathode of the freewheeling diode D2 and the positive pole V-WLED+ of the white LED string of the LED light board. The G pole of the FET field effect switch tube Q2 is connected to the PWM output pin GATE pin of the PWM chip U2. The S pole of the switch tube Q2 is connected to one end of the constant current detection resistor R8 and the current detection pin CS pin of the PWM chip U2, and the other end of the constant current detection resistor R8 is grounded.
本发明的双母线调色温的工作原理：The working principle of the double busbar color temperature of the present invention:
红色LED串和绿色LED串交叉围绕白色LED均匀排列，当调节直流母线电压A和直流母线电压B的大小和比值时，通过分压电阻R1、分压电阻R3、分压电阻R5、分压电阻R6、分压电阻R9、分压电阻R11、分压电阻R12以及分压电阻R13的分压使PWM芯片U1和PWM芯片U3的线性调光接收脚LD脚的电位发生变化，从而改变红色LED和绿色LED的电流变化，根据色彩的混合原理从而改变整改LED的色温。The red LED strings and the green LED strings are evenly arranged around the white LEDs. When adjusting the size and ratio of the DC bus voltage A and the DC bus voltage B, the voltage dividing resistor R1, the voltage dividing resistor R3, the voltage dividing resistor R5, the voltage dividing resistor The voltage division of R6, the voltage dividing resistor R9, the voltage dividing resistor R11, the voltage dividing resistor R12 and the voltage dividing resistor R13 makes the potential of the linear dimming receiving pin LD of the PWM chip U1 and PWM chip U3 change, thereby changing the red LED and The current change of the green LED changes the color temperature of the rectified LED according to the color mixing principle.
以上内容仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明权利要求书的保护范围之内。The above content is only to illustrate the technical idea of the present invention, and cannot limit the protection scope of the present invention. Any modification made on the basis of the technical solution proposed in accordance with the technical idea of the present invention falls within the scope of the claims of the present invention. within the scope of protection.
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| CN204014221U (en) * | 2014-08-25 | 2014-12-10 | 北京澄通光电股份有限公司 | The single colour temperature regulating circuit that drives of two-way LED illumination |
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