應用於LED照明之調光介面電路設計

Abstract

一般市面上除了Triac調光介面外就屬線性調光與PWM調光為大宗，因此要設計一款兩種調光方式均能兼容使用的介面電路就是本篇論文的主要目標。LED照明對於地球環保是有一定程度的貢獻，但在電路設計上，必須考慮關機不能消耗功率、待機狀態下，若有其他電路應維持功率小於0.5瓦、輸入功率因數(Power Factor, PF)必須設計高於0.7，因此挑選合適的PFC架構是必須的，因為輕便，體積小是現代化電路設計的趨勢，所以主動式PFC (Power Factor Correction) 架構是比較適合LED照明使用，另外在挑選驅動電源電路由於成本考量、安規上的需求，因此有隔離介面且使用元件數較少的Flyback架構就是我們的首選，另外控制迴路的選擇上，因為PSR (Primary Side Regulation)架構比SSR(Secondary Side Regulation) 架構少掉二次側所需元件，包含 : 光耦合器、誤差放大器、參考電壓REF，既可以減少元件且能減少PCB面積使用，符合LED照明在設計條件上輕便、低成本的目標，因以上三種條件，於是挑選虹冠電子的電源控制晶片CPU6563C 做為能源控制架構，在加上我們所設計的調光介面電路來進行調光，並探討在調光設計上所會遇到的問題與解決方案。

In addition to the Triac dimming interface, linear dimming and PWM dimming is most used in the dimming market, in this paper, we will design a dimming control interface for two dimming methods(linear dimming and PWM dimming). LED lighting for the Earth's environmental protection is helpful, so in the circuit design for LED lighting, you must be consided the shutdown can not consume power; in standby state, if having other circuits should maintain power less than 0.5 watts; input power factor (PF) must be designed higher than 0.7, so select an appropriate PFC (Power Factor Correction) architecture is necessary. Light and small size is the trend of design circuit for LED lighting, so active PFC architecture is the first choice for LED lighting. Due to cost considerations and safety requirements, when we select the type of power supply, Flyback converter is our first choice, because it have advantages of isolation and the fewer components. In the selection of the control loop circuit, the numbers of components that Primary Side Regulation (PSR) is less than Secondary Side Regulation (SSR). It mean if we choose PSR, we can save some components including optical coupler, error amplifier, reference voltage. That can help saving the using PCB area and reduce the components. According to the above three conditions, we choice the power control chip CPU6563C of Champion microelectronic Corp. to design circuit of power control and add our design of the dimming interface circuit to dimmer, to explore the dimming design will encounter problems and solutions.