A Simple and Effective LED Lighting Solution with AC Input 一個簡單而有競爭力的交流取電 LED 照明解決方案 2010 LED 通用照明研討會 劉興富

2 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Contents AC/DC LED lighting  What do we concern for AC/DC LED lighting? Power efficiency, component number, cost and safety  What issues are we facing?  What can we save about components?  What do we gain while removing transformer?  How can we overcome safety issue if no transformer?  Dose PF have to be 0.99? Limits for Class C equipment  Which controller can achieve our target? Dimming circuit, Passive PFC circuit, Active PFC circuit and DC/DC circuit Design examples for LED lighting via MBI6901 Measurement results  Material source for safety UL1012  Q&A

3 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s What do we concern for AC/DC LED lighting? Power conversion efficiency Component number Safety Power factor V i Space Cost Reliability Heat dissipation

4 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s What issues are we facing in E27? Component count Component count Space Space Safety Safety Power factor Power factor Cost Cost

5 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s What components can we save for space? Transformer is always space-occupying, especially for large current and switching low frequency. Associated Snubber circuit takes space, too. Transformer Transformer Snubber circuit Snubber circuit Photo couple Photo couple

6 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Safety 隔離一定要用變壓器嗎 ? 對於 LED 燈泡的應用可 以考慮不用變壓器隔離 !

7 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s What do we gain while removing transformer? Space down and Cost down Efficiency up 2~3% 20~30% 5~10% Circuit with transformer Circuit without transformer

8 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s How do we overcome safety issue? UL1012: Material to meet: 5VA, 5VB, V-0

9 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Does PF have to be 0.99 ?? EN , 電流諧波規範 From 南樺電機公司

10 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Classification of equipment  Class C: lighting equipment. –equipment with a primary function of generating and/or regulating and/or distributing optical radiation by means of incandescent lamps, discharge lamps or LED's 經由白熱燈泡, 放電燈或 LED 管而產生及 / 或調整及 / 或分 散光學幅射為主要功能的設備

11 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Limits for Class C equipment Active input power >25 W  For lighting equipment having an active input power greater than 25 W, the harmonic currents shall not exceed the relative limits given in Table 2. the harmonic current values for the maximum load condition derived from the percentage limits given in Table 2 shall not be exceeded; in any dimming position, the harmonic current shall not exceed the value of current allowed in the maximum load condition;

12 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Active input power ≤25 W Discharge lighting equipment having an active input power smaller than or equal to 25 W shall comply with one of the following two sets of requirements:  the harmonic currents shall not exceed the power-related limits of Table 3, column 2, or:  the third harmonic current, expressed as a percentage of the fundamental current, shall not exceed 86 % and the fifth harmonic current shall not exceed 61 %. Also, the waveform of the input current shall be such that it reaches the 5 % current threshold before or at 60º, has its peak value before or at 65º and does not fall below the 5 % current threshold before 90º, referenced to any zero crossing of the fundamental supply voltage. The current threshold is 5 % of the highest absolute peak value that occurs in the measurement window, and the phase angle measurements are made on the cycle that includes this absolute peak value. See Figure 2.

13 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Limits for Class C equipment

14 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Limits for Class D equipment

15 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Figure 2 – Illustration of the relative phase angle and current parameters

16 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Therefore, PF do not need to be 0.99/1.0.  The criteria are focus on THD of input current.  High PF will need extra cost. PF=0.99

17 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Which controller can achieve our target? MBI6901 Step-down, High efficiency, AC/DC LED Converter

18 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Features  Universal input from 80Vac to 265Vac  Efficiency > VAC=110V, 350mA, 6-LEDs  Setting current accuracy within ±5%  To driver external MOSFET  Hysteretic PFM improves efficiency at light loading  Full protection: Thermal/UVLO/OVP/LED open/short circuit  Available in package: MSOP-8L

19 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Typical application circuit

20 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Actual Picture With EMI solution

21 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Dimming application

22 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Passive-mode PFC application AC Input DC Output EMI Filter PFC Main Application Circuit of MBI6901

23 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Design example Input voltage range: 85V/AC~265V/AC Input voltage range: 85V/AC~265V/AC Conversion Efficiency: 110Vac, Full load Conversion Efficiency: 110Vac, Full load 220Vac, Full load 220Vac, Full load Conversion Power Factor: 110Vac, Full load Conversion Power Factor: 110Vac, Full load 220Vac, Full load 220Vac, Full load Output Current: 400mA ±5% (ILED = 0.2 / RSEN) Output Current: 400mA ±5% (ILED = 0.2 / RSEN) Safety and EMC: Passed UL and EN55015 Safety and EMC: Passed UL and EN55015

24 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Waveforms of V AC &I AC V LED V AC I AC V D7 VAC = 110V / 60HzVAC = 110V / 60Hz V LED V AC V D7 VAC = 220V / 60HzVAC = 220V / 60Hz

25 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Measurement results V AC V LED (V)I LED (mA)P IN (W)P OUT (W)η (%)PFCTHD (%) 85V / 60Hz V / 50Hz* V / 60Hz V / 60Hz V / 60Hz V / 60Hz V / 50Hz* V / 50Hz*

26 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Conduction Mode EMI

27 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Conduction Mode EMI

28 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Active-mode PFC application Design example  交流輸入電壓 85V~ 135V 且 PF ≧ 0.95  輸出 8W (24V/ 350mA), 效率能大於 80%

29 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Measurement results V AC (V)I AC (mA)P in (W)V LED (V)I LED (mA)η(%)PFTHD (%)

30 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s V AC and I AC VAC and IAC waveformsVAC and IAC waveforms Output waveformsOutput waveforms V AC I AC I LED V LED

31 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s DC/DC application

32 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Material source for safety UL1012 耐燃材料, 5VA/5VB, V-0  PBT 美国 GE 塑胶原料 东莞市（立邦）塑胶原料实业有限公司  星貿國際有限公司 / 星科貿易有限公司 ( 香港 )  …….

33 w w w. m b l o c k. c o m. t w P o w e r U p Y o u r L E D s Q&A