摘要:如今，LED已经成为了一项主流技术，它具有光效高、耗电少，寿命长、易控制、免维护、低损耗、低能耗，绿色环保本。对LED驱动电源的基本要求就是高可靠性，保护功能完善，效率高，使用寿命能与LED寿命相匹配。本次设计主要是设计LinkSwitch-PH系列单片隔离式带TRIAC调光和PFC恒流驱动电源集成电路。它具有PFC、TRIAC调光、远程通/断控制，精确恒流控制等功能，他能够满足宽范围交流输入电压范围为85~305V。主要是通过TRIAC调光器来调节电流的大小，进而控制LED灯光的强弱。电源效率可超过85%,功率因素大于0.9，适用于中、小功率的高性能隔离式LED驱动电源。56891

毕业论文关键词 ：TRIAC调光,功率因素,LED驱动电源

Abstract:Now, the LED has become a mainstream technology, it has high photosynthetic efficiency, less power consumption, long service life, easily controlled, free maintenance, low loss, low energy consumption, green environmental protection.For the LED drive power supply is the basic requirement of high reliability, good protecting function, high efficiency, service life can match the LED life. Anyhow, LED lighting has become a focal point of the modern science and technology with social and economic development.

This design is mainly design LinkSwitch - PH series monolithic isolation belt TRIAC dimmer and PFC IC constant-current drive power. It has PFC, TRIAC dimmer, remote on/off control, accurate constant current control, he would be able to meet the wide range of ac input voltage range is 85 ~ 305 v. The mainly through TRIAC dimmer to adjust the size of the current, and then control the strength of the LED lights. Power efficiency can be more than 85%, the power factor is greater than 0.9, high-performance isolation type is suitable for medium and small power LED drive power supply.

Key words:TRIAC dimmer;Power factor; LED drive power supply

目录

1 引言 1

1.1 LED照明的主要特点及应用领域 1

1.2目前国际上LED现状及发展 1

2 课题主要内容及目标 1

3 LED的接线方式 2

3.1 串联LED驱动方式 2

3.2并联LED驱动方式 3

3.3 混联LED驱动方式 3

3.4 多路混联LED驱动方式 4

4 LED驱动电源基本工作原理 4

4.1 开关电源原理 4

4.2 恒压式LDE驱动电源 5

4.2.1 LED驱动电源的类型 6

4.2.2 LED驱动电源工作模式 6

4.3 恒流式LED驱动电源 7

4.4 LED调光方式 7

4.4.1 PWM调光 7

4.4.2 模拟调光 7

4.4.3脉冲调光 8

5带晶闸管调光的LED驱动电源设计 8

6 芯片的设计 8

6.1 引脚功能描述 9

6.2 核心电路 10

6.3 晶闸管调光电路的设计 11

6.4 其它电路设计 12

6.4.1 EMI滤波电路 12

6.4.2整流电路