LED节能灯驱动电路（毕业设计论文doc）.doc

本科生毕业设计(论文)
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LED节能灯驱动电路
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LED节能灯驱动电路
LED efficient lightbulb lamp drive ciruit

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摘要
当今在提倡环保、节能,LED作为二十一世纪的新型半导体绿色照明灯,具有能耗低、寿命长、响应时间短、安全低压、环保、调节方便等诸多优点。本文概述了开关电源、PWM脉宽调制和驱动电路。LED灯不能像一般的白炽灯一样直接使用公用的电网电压,因此,设计了两种LED节能灯驱动电路。驱动电路采用PWM方式来调节节能灯的亮度,以便于实现颜色的多样化。
本系统用PIC16F684单片机为微处理器,采用开关电源的方式,用PWM调光,驱动效率高,输入范围广,抗干扰性强,调光方便。系统中红、绿、蓝三色各自采用单独的驱动电路,并且通过PIC16F684单片机的引脚进行PWM控制来调节LED的亮度,以便于实现颜色的多样化。系统电路中,市电经过AC-DC变换电路得到直流电,再经过DC-DC变换电路得到13V的电压给电路供电,电路中还有电压调节器可以得到5V的电压也供电路使用,输出部分还设有过流保护电路,使得电路更加安全。
关键词:LED;节能;驱动电路;PWM
ABSTRACT
Today in the promotion of environmental protection, energy saving, LED as a new type of semiconductor green lighting in twenty-first Century, has the advantages of low energy consumption, long service life, short response time, safety, environmental protection, convenient adjustment, low pressure. This paper outlines the switching power supply, PWM pulse width modulating and driving circuit. LED lamp can not be like incandescent general as a direct use of grid voltage, public therefore, two kinds of LED energy saving lamp driving circuit design. The driving circuit to adjust the brightness of energy-saving lamps using PWM mode, so as to realize the variety of colors.
The system used PIC16F684 SCM as microprocessor, using switching power supply, PWM dimming, high drive efficiency, input range, strong anti-interference, convenient adjustment. The system of red, hot, blue use separate drive circuit respectively, brightness and through the PIC16F684 microcontroller pin to PWM control to regulate the LED, so as to realize the variety of colors. The system circuit, power after the AC-DC transform circuit DC, after DC-DC conversion circuit of 13V voltage to the circuit, circuit and voltage regulator can get 5V voltage supply circuit, the output part is provided with over-current protection circuit, the circuit more safely and.
key words:LED ; Fuel-efficient ;Drive circuit ;PWM
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