CN211457457U - Simple dimming circuit with four-way constant current one-way constant voltage function - Google Patents

Abstract

The utility model discloses a simple and easy dimming circuit with constant voltage function is all the way to four ways constant current, it includes: the AC-DC module comprises an alternating current input end, an EMI anti-interference module, a rectification filter module, a transformer and a primary-secondary-crossing isolation main control chip; the cross primary and secondary isolation main control chip is in the model of INN3468C and is provided with a synchronous rectification driving MOS tube; the constant voltage and constant current output module comprises a constant voltage and constant current control chip which is of the type IMX102U and is connected with the primary and secondary isolation main control chip and the transformer; the constant-voltage constant-current control chip is provided with four constant-current output pins and a constant-voltage output pin, each constant-current output pin is connected with one LED lamp module, the constant-voltage output pin is connected with the 5V USB output module, and the 5V USB output module is connected with the transformer; the dimming circuit module comprises a dimming main control chip and a dimming key module, wherein the dimming main control chip is connected with the constant-voltage constant-current control chip and the LED lamp module and provides PWM signals for the constant-voltage constant-current control chip.

Description

Translated fromChinese

一种具有四路恒流一路恒压功能的简易调光电路A simple dimming circuit with four constant current and one constant voltage function

技术领域：Technical field:

本实用新型涉及电子电路技术领域，特指一种具有四路恒流一路恒压功能的简易调光电路。The utility model relates to the technical field of electronic circuits, in particular to a simple dimming circuit with functions of four channels of constant current and one channel of constant voltage.

背景技术：Background technique:

目前工业照明越来越重要，因为安全是一切作业原则，如何符合安全包含好的习惯与好的作业环境，当然不能在光线不足的环境作业，所以工业照明更加要重视。At present, industrial lighting is becoming more and more important, because safety is all operating principles, how to comply with safety, including good habits and a good working environment, of course, cannot work in an environment with insufficient light, so industrial lighting should be paid more attention.

目前照明设备在单路用反激式AC/DC LED调光输出是很简单的，如果是多组输出大部分为前级AC/DC反激电路和后级降压式LED恒流驱动电路，例如四组LED输出分别为东南西北方向的LED灯都是用共享按钮控制调光，前面会用AC/DC反激电路，加上四组独立控制芯片恒流电路与MCU调光电路，导致线路占了很大的面积。其中，AC/DC反激电路一般都会采用一个控制IC配合一个同步整流IC配合周边电路控制，并且采用光藕来当作初次级的隔离讯号，并使用TL431稳压器形成一个参考电压源，该同步整流IC还会搭配同步整流可驱动MOS管，而四组独立控制芯片恒流电路也必须采用四个恒流芯片配合周边电路控制，导致整个电路的元器件较多，不仅设计布局复杂，成本高，且需要占据很大的面积，不利于小型化复杂，并且也不利于提高市场竞争力。At present, it is very simple for lighting equipment to use flyback AC/DC LED dimming output in a single channel. If it is a multi-group output, most of them are the front-stage AC/DC flyback circuit and the back-stage step-down LED constant current drive circuit. For example, the four sets of LED outputs are the LED lights in the south, east, and northwest directions, all of which are controlled by a shared button. AC/DC flyback circuit will be used in the front, plus four sets of independent control chip constant current circuit and MCU dimming circuit, resulting in the circuit occupies a large area. Among them, the AC/DC flyback circuit generally uses a control IC with a synchronous rectifier IC with peripheral circuit control, and uses an optocoupler as the primary and secondary isolation signal, and uses a TL431 voltage regulator to form a reference voltage source. The synchronous rectification IC will also be equipped with synchronous rectification to drive the MOS tube, and the constant current circuit of the four groups of independent control chips must also use four constant current chips to cooperate with the peripheral circuit control, resulting in many components in the entire circuit, which not only complicated the design layout, but also cost It is high and needs to occupy a large area, which is not conducive to miniaturization and complexity, and is not conducive to improving market competitiveness.

有鉴于此，本发明人提出以下技术方案。In view of this, the inventors propose the following technical solutions.

实用新型内容：Utility model content:

本实用新型的目的在于克服现有技术的不足，提供一种具有四路恒流一路恒压功能的简易调光电路。The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a simple dimming circuit with the functions of four channels of constant current and one channel of constant voltage.

为了解决上述技术问题，本实用新型采用了下述技术方案：该具有四路恒流一路恒压功能的简易调光电路包括：AC-DC模块，其包括有交流输入端、EMI抗干扰模块、整流滤波模块和变压器、与变压器的初次级均连接的跨初次级隔离主控芯片，该跨初次级隔离主控芯片型号为INN3468C，其带有同步整流可驱动MOS管；恒压恒流输出模块，其包括有恒压恒流控制芯片，该恒压恒流控制芯片的型号为IMX102U，该恒压恒流控制芯片与跨初次级隔离主控芯片及变压器均连接；该恒压恒流控制芯片内置有恒流恒压回路，其具有四个恒流输出脚和一个恒压输出脚，每个恒流输出脚均连接一路LED灯模块，该恒压输出脚连接一路5V USB输出模块，该5V USB输出模块还连接变压器；调光电路模块，其包括有调光主控芯片和与该调光主控芯片连接的调光按键模块，该调光主控芯片连接所述恒压恒流控制芯片，并为该恒压恒流控制芯片提供PWM信号，该调光主控芯片还连接四路所述LED灯模块。In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: the simple dimming circuit with four constant current and one constant voltage function includes: an AC-DC module, which includes an AC input terminal, an EMI anti-interference module, The rectifier filter module and the transformer, and the primary and secondary isolation main control chip connected to the primary and secondary of the transformer. The model of the primary and secondary isolation main control chip is INN3468C, which has synchronous rectification to drive MOS tubes; constant voltage and constant current output module , which includes a constant voltage and constant current control chip. The model of the constant voltage and constant current control chip is IMX102U. The constant voltage and constant current control chip is connected with the primary isolation main control chip and the transformer. The constant voltage and constant current control chip There is a built-in constant current and constant voltage circuit, which has four constant current output pins and one constant voltage output pin, each constant current output pin is connected to a LED light module, the constant voltage output pin is connected to a 5V USB output module, the 5V USB The output module is also connected to the transformer; the dimming circuit module includes a dimming main control chip and a dimming key module connected to the dimming main control chip, and the dimming main control chip is connected to the constant voltage and constant current control chip, The PWM signal is provided for the constant voltage and constant current control chip, and the dimming master control chip is also connected to the four-way LED lamp modules.

进一步而言，上述技术方案中，所述LED灯模块包括有至少两个串联在一起的LED和用于控制该LED通电的第一MOS管，该第一MOS管的D极连接该LED的阳极，该LED的阴极连接所述恒压恒流控制芯片的恒流输出脚，该第一MOS管的G极连接第一电阻后连接所述调光主控芯片，该第一MOS管的S极与D极之间连接有第二电阻，且该第一MOS管的S极连接所述变压器。Further, in the above technical solution, the LED lamp module includes at least two LEDs connected in series and a first MOS tube for controlling the power-on of the LEDs, and the D pole of the first MOS tube is connected to the anode of the LED , the cathode of the LED is connected to the constant current output pin of the constant voltage and constant current control chip, the G pole of the first MOS tube is connected to the first resistor and then connected to the dimming main control chip, the S pole of the first MOS tube A second resistor is connected with the D pole, and the S pole of the first MOS transistor is connected to the transformer.

进一步而言，上述技术方案中，所述5V USB输出模块包括有依次连接的第二MOS管和π型LC滤波回路及USB接口，该第二MOS管的G极连接所述恒压恒流控制芯片的恒压输出脚。Further, in the above technical solution, the 5V USB output module includes a second MOS tube, a π-type LC filter loop and a USB interface that are connected in sequence, and the G pole of the second MOS tube is connected to the constant voltage and constant current control. The constant voltage output pin of the chip.

进一步而言，上述技术方案中，所述变压器的次级包括有一个5V输出绕组，一个是供电给恒压恒流控制芯片的供电绕组，另外一个是LED正端绕组；该5V输出绕组连接所述5VUSB输出模块，该供电绕组连接所述恒压恒流控制芯片，该LED正端绕组连接所述LED灯模块。Further, in the above technical solution, the secondary of the transformer includes a 5V output winding, one is the power supply winding for supplying power to the constant voltage and constant current control chip, and the other is the LED positive end winding; the 5V output winding is connected to the The 5V USB output module, the power supply winding is connected to the constant voltage and constant current control chip, and the LED positive end winding is connected to the LED lamp module.

进一步而言，上述技术方案中，所述调光主控芯片的型号为MC96F8208S。Further, in the above technical solution, the model of the dimming main control chip is MC96F8208S.

进一步而言，上述技术方案中，所述调光按键模块包括有全亮调光按键、亮度减调光按键、亮度加调光按键。Further, in the above technical solution, the dimming button module includes a full brightness dimming button, a brightness reduction dimming button, and a brightness plus dimming button.

进一步而言，上述技术方案中，所述调光电路模块包括有LED指示灯模组，该LED指示灯模组连接所述调光主控芯片。Further, in the above technical solution, the dimming circuit module includes an LED indicator module, and the LED indicator module is connected to the dimming main control chip.

采用上述技术方案后，本实用新型与现有技术相比较具有如下有益效果：由于AC-DC模块中的跨初次级隔离主控芯片型号为INN3468C，其自身带有同步整流可驱动MOS管，可以省掉同步整流IC，也不用再额外增加光藕来当作初次级的隔离讯号，可以省掉TL431稳压器，可以节省掉很多十几颗零件；本实用新型还采用恒压恒流控制芯片，该恒压恒流控制芯片内置有恒流恒压回路，其具有四个恒流输出脚和一个恒压输出脚，每个恒流输出脚均连接一路LED灯模块，该恒压输出脚连接一路5V USB输出模块，以此达到一个恒压恒流控制芯片实现四路恒流输出和一路恒压输出，替代了传统需要四组独立控制芯片恒流电路，大大简化了电路，大幅度简化四组LED调光电路的设计，节省了多个芯片，以致更好的布局电路，且线路占了很小的面积，使用起来更加方便，实现非常高的系统效率，并可实现PWM调光和仿真调光或是混合讯号调光来配合施工厂地的明亮程度。同时并具有一组恒压的5V USB输出，可以用在各种产品的USB输入充电功能，比如锁螺丝的手电披和手机等等，使用起来极其方便，令本实用新型具有极强的市场竞争力。After adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: because the model of the main control chip across the primary and secondary isolation in the AC-DC module is INN3468C, which has its own synchronous rectification and can drive the MOS tube, which can The synchronous rectification IC is omitted, and there is no need to add an additional optical coupler as the primary and secondary isolation signal, the TL431 voltage regulator can be omitted, and many dozens of parts can be saved; the utility model also adopts a constant voltage and constant current control chip. , the constant voltage and constant current control chip has a built-in constant current and constant voltage circuit, which has four constant current output pins and one constant voltage output pin, each constant current output pin is connected to one LED lamp module, and the constant voltage output pin is connected to onechannel 5V USB output module, so as to achieve a constant voltage and constant current control chip to achieve four constant current outputs and one constant voltage output, replacing the traditional constant current circuit that requires four independent control chips, greatly simplifying the circuit, greatly simplifying the four groups The design of the LED dimming circuit saves multiple chips, resulting in a better layout circuit, and the circuit occupies a small area, which is more convenient to use, achieves very high system efficiency, and can realize PWM dimming and simulation dimming. Light or mixed-signal dimming to match the brightness of the construction site. At the same time, it has a set ofconstant voltage 5V USB output, which can be used in the USB input charging function of various products, such as flashlights and mobile phones that lock screws, etc. It is extremely convenient to use and makes the utility model have strong market competition. force.

附图说明：Description of drawings:

图1是本实用新型第一部分的电路图；Fig. 1 is the circuit diagram of the first part of the present utility model;

图2是本实用新型第二部分的电路图。Figure 2 is a circuit diagram of the second part of the present invention.

具体实施方式：Detailed ways:

下面结合具体实施例和附图对本实用新型进一步说明。The present utility model will be further described below with reference to specific embodiments and accompanying drawings.

见图1-2所示，为一种具有四路恒流一路恒压功能的简易调光电路，其包括：AC-DC模块1，其包括有交流输入端11、EMI抗干扰模块12、整流滤波模块13和变压器14、与变压器14的初次级均连接的跨初次级隔离主控芯片15，该跨初次级隔离主控芯片15型号为INN3468C，其带有同步整流可驱动MOS管；恒压恒流输出模块2，其包括有恒压恒流控制芯片21，该恒压恒流控制芯片21的型号为IMX102U，该恒压恒流控制芯片21与跨初次级隔离主控芯片15及变压器14均连接；该恒压恒流控制芯片21内置有恒流恒压回路，其具有四个恒流输出脚和一个恒压输出脚，每个恒流输出脚均连接一路LED灯模块22，该恒压输出脚连接一路5V USB输出模块23，该5V USB输出模块23还连接变压器14；调光电路模块3，其包括有调光主控芯片31和与该调光主控芯片31连接的调光按键模块32，该调光主控芯片31连接所述恒压恒流控制芯片21，并为该恒压恒流控制芯片21提供PWM信号，该调光主控芯片31还连接四路所述LED灯模块22。由于AC-DC模块中的跨初次级隔离主控芯片15型号为INN3468C，其自身带有同步整流可驱动MOS管，可以省掉同步整流IC，也不用再额外增加光藕来当作初次级的隔离讯号，可以省掉TL431稳压器，可以节省掉很多十几颗零件；本实用新型还采用恒压恒流控制芯片21，该恒压恒流控制芯片21内置有恒流恒压回路，其具有四个恒流输出脚和一个恒压输出脚，每个恒流输出脚均连接一路LED灯模块22，该恒压输出脚连接一路5VUSB输出模块23，以此达到一个恒压恒流控制芯片21实现四路恒流输出和一路恒压输出，替代了传统需要四组独立控制芯片恒流电路，大大简化了电路，大幅度简化四组LED调光电路的设计，节省了多个芯片，以致更好的布局电路，且线路占了很小的面积，使用起来更加方便，实现非常高的系统效率，并可实现PWM调光和仿真调光或是混合讯号调光来配合施工厂地的明亮程度。同时并具有一组恒压的5V USB输出，可以用在各种产品的USB输入充电功能，比如锁螺丝的手电披和手机等等，使用起来极其方便，令本实用新型具有极强的市场竞争力。As shown in Figure 1-2, it is a simple dimming circuit with four channels of constant current and one channel of constant voltage. Thefilter module 13, thetransformer 14, and the primary and secondary isolationmain control chip 15 connected to the primary and secondary of thetransformer 14. The type of the primary and secondary isolationmain control chip 15 is INN3468C, which has synchronous rectification to drive MOS tubes; constant voltage The constantcurrent output module 2 includes a constant voltage and constantcurrent control chip 21, the model of the constant voltage and constantcurrent control chip 21 is IMX102U, the constant voltage and constantcurrent control chip 21 is separated from the primary and secondary isolationmain control chip 15 and thetransformer 14. The constant voltage and constantcurrent control chip 21 has a built-in constant current and constant voltage circuit, which has four constant current output pins and one constant voltage output pin, each constant current output pin is connected to oneLED lamp module 22, the constant voltage The output pin is connected to a 5VUSB output module 23, and the 5VUSB output module 23 is also connected to thetransformer 14; thedimming circuit module 3 includes a dimmingmain control chip 31 and a dimming button connected to the dimmingmain control chip 31Module 32, the dimmingmain control chip 31 is connected to the constant voltage and constantcurrent control chip 21, and provides a PWM signal for the constant voltage and constantcurrent control chip 21, and the dimmingmain control chip 31 is also connected to four channels of theLED lights module 22. Since themain control chip 15 across the primary and secondary isolation in the AC-DC module is INN3468C, it has its own synchronous rectification to drive the MOS tube, which can save the synchronous rectification IC, and no need to add an additional optical coupling as the primary and secondary By isolating the signal, the TL431 voltage stabilizer can be saved, and many dozens of parts can be saved; the utility model also adopts a constant voltage and constantcurrent control chip 21, and the constant voltage and constantcurrent control chip 21 has a built-in constant current and constant voltage loop, which has Four constant current output pins and one constant voltage output pin, each constant current output pin is connected to aLED lamp module 22, the constant voltage output pin is connected to a5VUSB output module 23, so as to achieve a constant voltage and constantcurrent control chip 21 It realizes four constant current outputs and one constant voltage output, which replaces the traditional constant current circuit that requires four independent control chips, greatly simplifies the circuit, greatly simplifies the design of four groups of LED dimming circuits, saves multiple chips, and even more Good layout circuit, and the circuit occupies a small area, it is more convenient to use, achieves very high system efficiency, and can realize PWM dimming and simulation dimming or mixed-signal dimming to match the brightness of the construction site . At the same time, it has a set ofconstant voltage 5V USB output, which can be used in the USB input charging function of various products, such as flashlights and mobile phones that lock screws, etc. It is extremely convenient to use and makes the utility model have strong market competition. force.

所述LED灯模块22包括有至少两个串联在一起的LED和用于控制该LED通电的第一MOS管221，该第一MOS管221的D极连接该LED的阳极，该LED的阴极连接所述恒压恒流控制芯片21的恒流输出脚，该第一MOS管221的G极连接第一电阻后连接所述调光主控芯片31，该第一MOS管221的S极与D极之间连接有第二电阻，且该第一MOS管221的S极连接所述变压器14。TheLED lamp module 22 includes at least two LEDs connected in series and afirst MOS tube 221 for controlling the power-on of the LEDs. The D pole of thefirst MOS tube 221 is connected to the anode of the LED, and the cathode of the LED is connected to The constant current output pin of the constant voltage and constantcurrent control chip 21, the G pole of thefirst MOS transistor 221 is connected to the first resistor and then connected to the dimmingmaster control chip 31, the S pole of thefirst MOS transistor 221 is connected to the D pole A second resistor is connected between the poles, and the S pole of thefirst MOS transistor 221 is connected to thetransformer 14 .

所述5V USB输出模块23包括有依次连接的第二MOS管231和π型LC滤波回路232及USB接口233，该第二MOS管231的G极连接所述恒压恒流控制芯片21的恒压输出脚。The 5VUSB output module 23 includes asecond MOS transistor 231, a π-typeLC filter circuit 232 and aUSB interface 233 connected in sequence, and the G pole of thesecond MOS transistor 231 is connected to the constant voltage and constantcurrent control chip 21. Press the output pin.

所述变压器14的次级包括有一个5V输出绕组，一个是供电给恒压恒流控制芯片21的供电绕组，另外一个是LED正端绕组；该5V输出绕组连接所述5V USB输出模块23，该供电绕组连接所述恒压恒流控制芯片21，该LED正端绕组连接所述LED灯模块22。The secondary of thetransformer 14 includes a 5V output winding, one is the power supply winding for supplying power to the constant voltage and constantcurrent control chip 21, and the other is the LED positive end winding; the 5V output winding is connected to the 5VUSB output module 23, The power supply winding is connected to the constant voltage and constantcurrent control chip 21 , and the LED positive end winding is connected to theLED lamp module 22 .

所述调光主控芯片31的型号为MC96F8208S。The model of the dimmingmain control chip 31 is MC96F8208S.

所述调光按键模块32包括有全亮调光按键321、亮度减调光按键322、亮度加调光按键323，按下全亮调光按键321时，LED全亮，还可通过亮度减调光按键322、亮度加调光按键323实现亮度的调节。Thedimming button module 32 includes a fullbrightness dimming button 321, a brightness reduction dimming button 322, and a brightness plusdimming button 323. When the fullbrightness dimming button 321 is pressed, the LEDs are fully on, and the brightness can also be reduced by adjusting the brightness. The light button 322 and the brightness plusdimming button 323 realize brightness adjustment.

所述调光电路模块3包括有LED指示灯模组34，该LED指示灯模组34连接所述调光主控芯片31。Thedimming circuit module 3 includes anLED indicator module 34 , and theLED indicator module 34 is connected to the dimmingmain control chip 31 .

综上所述，由于AC-DC模块中的跨初次级隔离主控芯片15型号为INN3468C，其自身带有同步整流可驱动MOS管，可以省掉同步整流IC，也不用再额外增加光藕来当作初次级的隔离讯号，可以省掉TL431稳压器，可以节省掉很多十几颗零件；本实用新型还采用恒压恒流控制芯片21，该恒压恒流控制芯片21内置有恒流恒压回路，其具有四个恒流输出脚和一个恒压输出脚，每个恒流输出脚均连接一路LED灯模块22，该恒压输出脚连接一路5V USB输出模块23，以此达到一个恒压恒流控制芯片21实现四路恒流输出和一路恒压输出，替代了传统需要四组独立控制芯片恒流电路，大大简化了电路，大幅度简化四组LED调光电路的设计，节省了多个芯片，以致更好的布局电路，且线路占了很小的面积，使用起来更加方便，实现非常高的系统效率，并可实现PWM调光和仿真调光或是混合讯号调光来配合施工厂地的明亮程度。同时并具有一组恒压的5V USB输出，可以用在各种产品的USB输入充电功能，比如锁螺丝的手电披和手机等等，使用起来极其方便，令本实用新型具有极强的市场竞争力。To sum up, since themain control chip 15 across the primary and secondary isolation in the AC-DC module is INN3468C, it has its own synchronous rectification to drive the MOS tube, so the synchronous rectification IC can be omitted, and there is no need to add additional optical couplings. As the primary isolation signal, the TL431 voltage stabilizer can be omitted, and many dozens of parts can be saved; the utility model also adopts a constant voltage and constantcurrent control chip 21, and the constant voltage and constantcurrent control chip 21 has a built-in constant current and constantcurrent control chip 21. The voltage circuit has four constant current output pins and one constant voltage output pin, each constant current output pin is connected to oneLED lamp module 22, and the constant voltage output pin is connected to one 5VUSB output module 23, so as to achieve a constant The voltage and constantcurrent control chip 21 realizes four channels of constant current output and one channel of constant voltage output, which replaces the traditional constant current circuit that requires four sets of independent control chips, greatly simplifies the circuit, greatly simplifies the design of four sets of LED dimming circuits, saves Multiple chips, so as to better layout the circuit, and the circuit occupies a small area, it is more convenient to use, achieves very high system efficiency, and can realize PWM dimming and simulation dimming or mixed-signal dimming to match The brightness of the construction site. At the same time, it has a set ofconstant voltage 5V USB output, which can be used in the USB input charging function of various products, such as flashlights and mobile phones that lock screws, etc. It is extremely convenient to use and makes the utility model have strong market competition. force.

当然，以上所述仅为本实用新型的具体实施例而已，并非来限制本实用新型实施范围，凡依本实用新型申请专利范围所述构造、特征及原理所做的等效变化或修饰，均应包括于本实用新型申请专利范围内。Of course, the above are only specific embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made in accordance with the structures, features and principles described in the scope of the patent application of the present invention are not intended to limit the scope of the present invention. It should be included in the scope of the patent application of this utility model.

Claims (7)

1. A simple dimming circuit with four constant current and one constant voltage functions is characterized in that: it includes:

the AC-DC module (1) comprises an alternating current input end (11), an EMI anti-interference module (12), a rectifying and filtering module (13), a transformer (14) and a primary-secondary-crossing isolation main control chip (15) connected with the primary and secondary sides of the transformer (14), wherein the type of the primary-secondary-crossing isolation main control chip (15) is INN3468C, and the primary-secondary-crossing isolation main control chip is provided with a synchronous rectification drivable MOS (metal oxide semiconductor) tube;

the constant voltage and constant current output module (2) comprises a constant voltage and constant current control chip (21), the model of the constant voltage and constant current control chip (21) is IMX102U, and the constant voltage and constant current control chip (21) is connected with a primary-secondary-crossing isolation main control chip (15) and a transformer (14); the constant-voltage constant-current control chip (21) is internally provided with a constant-current constant-voltage loop which is provided with four constant-current output pins and a constant-voltage output pin, each constant-current output pin is connected with one LED lamp module (22), the constant-voltage output pin is connected with one 5V USB output module (23), and the 5V USB output module (23) is also connected with a transformer (14);

dimming circuit module (3), it is including dimming main control chip (31) and with dimming button module (32) that this dimming main control chip (31) is connected, this dimming main control chip (31) are connected constant voltage constant current control chip (21) to for this constant voltage constant current control chip (21) provide the PWM signal, this dimming main control chip (31) still connect four ways LED lamp module (22).

2. The simple dimming circuit with four paths of constant currents and one path of constant voltage function as claimed in claim 1, wherein: the LED lamp module (22) comprises at least two LEDs connected in series and a first MOS tube (221) used for controlling the LEDs to be electrified, the D pole of the first MOS tube (221) is connected with the anode of the LEDs, the cathode of the LEDs is connected with a constant current output pin of the constant voltage and constant current control chip (21), the G pole of the first MOS tube (221) is connected with a first resistor and then is connected with the dimming main control chip (31), a second resistor is connected between the S pole and the D pole of the first MOS tube (221), and the S pole of the first MOS tube (221) is connected with the transformer (14).

3. The simple dimming circuit with four paths of constant currents and one path of constant voltage function as claimed in claim 1, wherein: the 5V USB output module (23) comprises a second MOS tube (231), a pi-type LC filter loop (232) and a USB interface (233) which are sequentially connected, and the G pole of the second MOS tube (231) is connected with the constant-voltage output pin of the constant-voltage constant-current control chip (21).

4. A simple dimming circuit with four constant current and one constant voltage functions as claimed in any one of claims 1 to 3, wherein: the secondary side of the transformer (14) comprises a 5V output winding, one is a power supply winding for supplying power to the constant-voltage constant-current control chip (21), and the other is an LED positive end winding; the 5V output winding is connected with the 5V USB output module (23), the power supply winding is connected with the constant-voltage constant-current control chip (21), and the LED positive end winding is connected with the LED lamp module (22).

5. The simple dimming circuit with four paths of constant currents and one path of constant voltage function as claimed in claim 4, wherein: the model of the dimming main control chip (31) is MC96F 8208S.

6. The simple dimming circuit with four paths of constant currents and one path of constant voltage function as claimed in claim 4, wherein: the dimming key module (32) comprises a full-bright dimming key (321), a brightness dimming key (322) and a brightness dimming key (323).

7. The simple dimming circuit with four paths of constant currents and one path of constant voltage function as claimed in claim 4, wherein: the dimming circuit module (3) comprises an LED indicating lamp module (34), and the LED indicating lamp module (34) is connected with the dimming main control chip (31).

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