本文介绍了一种从6伏电池驾驶超过一百个白光LED的创新方式。该电路利用IC 555来驱动升压变压器，其输出最终用于照亮LED。特殊的PWM配置使电路很大效率。
Main Stages of the Design
The main stages of this 6V 100 LED pwm driver using IC 555 are an astable multivibrator stage configured with PWM control facility and an output transformer step-up stage.
由PWM级产生的脉冲用于倾倒和饱和变压器的输入绕组，该输入绕组被放大到变压器的输出绕组的指定水平驱动在那里的束的LED。
Using IC 555 for PWM Control
The IC 555 is wired up in its most usual configuration, as an astable multivibrator. Everything about the circuit looks pretty common as the pin outs of the IC is configured with its usual format, except for the two diodes and a couple of presets which makes the circuit a bit different from the typical 555 astable set ups.
这里包含两个二极管和预设可以离散地控制脉冲形成。
This control of the pulses is termed PWM or pulse width modulation.
通过引用图表和以下几点可以理解电路中的PWM实现：
最初当电路供电时，触发IC的触发引脚的引脚＃2与放电模式中的电容器保持低电平，保持输出低电平。
Once C2 is fully discharged, flips the output which was initially low to high.At this point the capacitor C2 begins charging through D1 and P1, until the voltage across C2 reaches 2/3rd of the supply voltage, when pin #6 of the IC is switched, resulting the output and pin #7 to go low yet again.
Circuit Diagram
The above procedure repeats, causing sustained oscillations at the output.
However since the charging and discharging periods of C2 directly corresponds to the output periods of the pulses, it simply means that by varying or controlling the charging and discharging of C2 separately, we should be able to dimension the output pulses correspondingly.
锅或预设P1和P2are exactly placed for these adjustments and hence constitutes the PWM function.
The PWM application contributes to another important function for the present application. By suitably optimizing the pulses, we can set the circuit to a most economic position for obtaining optimum brightness from the LEDs at relatively lower battery consumption.
来自IC的输出取自其引脚数三，并用于驱动作为电源晶体管。
Since the collector of the power transistor is joined to the secondary (low voltage) winding of an ordinary AC-DC transformer, the entire supply voltage is dumped periodically into this section of the transformer inductor.
As anticipated, this pulsed voltage which is forced into the secondary winding induces a proportional magnitude of voltage into the primary winding of the transformer.
与变压器与其正常的AC-DC适配器应用一起使用时，该过程完全逆转。
电压升级而不是踩到约230伏，这恰好是其正常的初级绕组规范。
This stepped up voltage available at the free winding ends of the transformer is actually used for driving a large number of LEDs which are wired up through long series and a few parallel connections.
电路如何供电
拟议的100 v LED驱动电路驱动经过a SMF battery of 6 volts and around 4 AH of capacity. The power of the battery may appear to be quite high but the parameters are not suitable for driving a very high number of LEDs.
I have already discussed about this issue in number of my earlier posts. Basically LEDs are voltage driven devices and not current, i.e. if the applied voltage satisfies the forward voltage, the LEDs get illuminated with nominal current levels and on the contrary if the voltage does not match the LEDs forward voltage spec, then the LED refuses to light even if the applied current is made 100 times the saturating value.
Another factor associated with LEDs is that, these devices can be run in series with its minimum specified current levels.
That means if the voltage of the series matches the total forward voltage of the series, the current required would be just around the magnitude that would be required for lighting a single LED.
This parameter rather feature with LEDs wiring becomes imperative when the source voltage is quite low.
Thus for driving many numbers of LEDs as discussed for the proposed circuit from a 6 volts source, the above rule becomes necessary and has been effectively employed.
Parts List
制作上述PWM LED驱动电路需要以下部分：
All the resistors are ¼ watt unless otherwise specified.
- R1 , R2 = 1 K,
- R3 = 10 K,
- R4，R5，R6 = 100欧姆，
- P1, P2 = 100 K
- C1 = 10 uF / 25 V,C2 = 0.001 uF, ceramic disc,
- IC = LM 555，
- T1 = TIP 127,
- TR1 = sec. – 0 – 6 V, prim. – 0 – 230 V, 500mA
- Battery – 6 volts, 4 AH, SUNCA type,
- PCB – Veroboard, cut according to the required size.
- LEDs – 5 mm, white, high bright, high-efficiency.CAUTION - THE CIRCUIT IS BASED ON THE ASSUMPTIONS MADE BY THE AUTHOR AND HAS NOT BEEN PRACTICALLY VERIFIED, VIEWERS DISCRETION IS ADVISED.
Hi Kiran,
If you are finding the above circuit difficult, you can try the following circuit, it's similar but does not incorporate a transformer rather a coil wound over a ferrite rod. Use 100 turns of any thin enameled copper wire over a 5 inches ferrite rod:
//www.addme-blog.com/2013/03/how-to-convert-12v-dc-to-220v-ac-using.html
You can remove all components that's shown at the right hand side of the mosfet and at its gate.
hello sir
i will be glad if u help me in guiding as in how to design a 5 volt led circuit comprising of about 59 led's, with a dimmer
你好，先生
i want to make light up around 50 led's from a 5volt dc supply. can u plz help me building it?
hi Anirudh
您想要使用哪种类型的LED？请提供LED的电流和电压等级。
先生，我想使用常规5毫米的白色LED。
The circuit u designed "100 led's from 6 volt" is a nice circuit but I guess it will be caught flickering in the video frames as I am making this for my videography work.
所以我正在寻找5-6伏电池供电的电路，以照射大约50个LED。
Anirudh, you will have to connect all the LEDs in parallel with one resistor for each LED.
For 6v supply the value of the resistors will be 150 ohms 1/4 watt
Thanks a lot sir. It helped me a lot.
你是欢迎Anirudh。
Hello sir, please I have Purchase all the components but I am confused about how the resistors are connected to the LEDs. Please could you kindly expand the diagram at the point where the LEDs are connected to the resistors..i have 100 LEDs
HELO 1WORLD.
电阻器与LED串联连接。
you will have make one modification in the circuit.
Don't use the mentioned transformer for TR1.
通过卷绕200制造的线圈更换它，转换为铁氧体杆。电线可以是任何薄的搪瓷铜线，用于降压变压器。
This coil must be connected across the collector of the transistor and ground.
Don't include the diode across the coil.
现在只需将LED连接，如直接平行于上述线圈所示。
Sir can we use a 4 volt 3 Ah battery for this circuit and if yes what changes do we have to make.
Rahul，是的，你可以使用它。不需要更改。
Sir, is there any dmx controlling board circuit as i wanted to controll rgb led strips using dmx controller
Raja, I do not have a dmx controller circuit at the moment, I'll try to find it…. although a simpler version can be studied in this article:
//www.addme-blog.com/2015/01/rgb-led-flasher-circuit.html
斯里。Majumdar，
电池如何被充电？
svs.
晚安先生！你有一个简单的6伏LED闪光灯电路吗？
jindro，您可以尝试以下文章中提供的设计：
//www.addme-blog.com/how-to-make-any-light-strobe-light/
Hi Swagatam, I want to power couple of 3 watt 220 volt AC led bulbs (which are commercially available) from a DC power source which gives 5 volt DC @ 500 mA as the output. Can I connect two such 3 watt led bulbs in parallel to your: 'Illuminating 100 LEDs from 6 Volt Battery Circuit' and will it give me the same brightness as it does when running from the mains supply? If that is not possible, can you please suggest a suitable circuit which will be low in cost and can give the desired output for 1 or 2 hrs with minimal components and current consumption? Regards, Raj.
Hi Raj,
您可以使用上述功能，但由于铁芯Trafo的参与，亮度可能会减少......甚至可以在以下文章中看到的更简单的设计：
//www.addme-blog.com/2013/03/how-to-convert-12v-dc-to-220v-ac-using.html
6.V can also be used for getting 220V from this circuit, basically the coil turns determine the maximum output voltage.
您可以忽略并删除MOSFET右侧显示的所有显示，以及BC547晶体管。
使用0.3mm超搪瓷铜线可以将线圈卷绕在铁氧体环或铁氧体棒上
Hi,
In this circuit, 4 rows of 50 LED’s each, right?
You have, for what I can see, 3 rows, of 50 LED each, that gives 150 LED’s.
如果每行约为1A（50×20mA），我可以通过5W LED替换所有50个LED。
我的假设是否正确？
Best Regards.
Nelio
Hi, current in a series string is always the same. So for each vertical column the current will be 20 mA only.