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荧光灯电子镇流器的工作原理是什么? What is the working principle of electronic ballast for fluorescent lamp?

荧光灯电子镇流器是20世纪80年代初由荷兰飞利浦电子公司开发的,

The fluorescent electronic ballast was developed by Philips Electronics in the early 1980s,

与传统的电感镇流器相比,

Compared with traditional inductor ballasts,

它在电气性能上更加独特。

It is more unique in electrical performance.

因此电子镇流器具有很强的生命力。

Therefore, electronic ballast has a strong vitality.

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荧光灯电子镇流器的电路设计有很多种。

There are many kinds of circuit design for electronic ballast of fluorescent lamp.

目前,随着科学技术的飞速发展,

At present, with the rapid development of science and technology,

荧光灯电子镇流器的设计趋于集成化或模块化,

The design of electronic ballasts for fluorescent lamps tends to be integrated or modular,

以简化电路结构。

To simplify the circuit structure.

电气性能更可靠、稳定、安全。下面介绍由模块和少量电子元件组成的电子镇流器的电路图。

Electrical performance is more reliable, stable and safe. The following describes the circuit diagram of the electronic ballast composed of modules and a small number of electronic components.

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hd9712模块主要由整流器、电流跟踪和分级滤波组成。

Hd9712 module is mainly composed of rectifier, current tracking and hierarchical filtering.

荧光灯电子镇流器的功率因数、电流峰值因数和电流谐波含量统称为三项技术指标。

The power factor, current peak factor and current harmonic content of fluorescent lamp electronic ballast are collectively referred to as three technical indicators.

普通荧光灯电子镇流器的三项指标很难同时达到工信部颁发的标准。

It is difficult to reach the standards issued by MIIT at the same time.

hd9712模块的电子镇流器达到了三项指标,

The electronic ballast of hd9712 module has reached three targets,

达到了标准中“H”级的要求。

It meets the requirements of "H" in the standard.

打开电源,通过F1和C1将电流输入hd9712电路的“1,2”引脚。

Turn on the power supply and input the current into "1, 2" pin of hd9712 circuit through F1 and C1.

经hd9712电路整流、电流跟踪、分级滤波后,

After hd9712 circuit rectification, current tracking and graded filtering,

由“3”脚输出约300V直流电压作为镇流器的工作电源,

The "3" pin outputs about 300V DC voltage as the working power supply of the ballast,

经R2降压后加至C3、D2锯齿波发生器。

After R2 depressurization, it is added to C3 and D2 sawtooth wave generators.

C3和D2产生锯齿脉冲触发振荡器电路,使振荡器工作。

C3 and D2 generate sawtooth pulse to trigger the oscillator circuit and make the oscillator work.

工作频率2530kHz的高频电压送至L4、C4升压后,

After the high frequency voltage with working frequency of 2530khz is sent to L4 and C4 for boosting,

荧光灯内气体电离,灯亮。

The gas in the fluorescent lamp is ionized and the lamp is on.

同时,通过C4电路的少量电流对灯丝起辅助加热作用,维持稳定的照明。

At the same time, a small amount of current through C4 circuit plays an auxiliary heating role on the filament to maintain stable lighting.

R5是一个软起动器,可以延长灯的寿命。R1为过电压保护电阻。

R5 is a soft starter that can extend the life of the lamp. R1 is the over-voltage protection resistance.

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