Post on 17-Dec-2015
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
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ContentsContents
AC/DC LED lighting What do we concern for AC/DC LED lighting?
Power efficiency, component number, cost and safetyWhat 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 equipmentWhich controller can achieve our target?
Dimming circuit, Passive PFC circuit, Active PFC circuit and DC/DC circuitDesign examples for LED lighting via MBI6901Measurement results
Material source for safety UL1012Q&A
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What do we concern for AC/DC LED What do we concern for AC/DC LED lighting?lighting?
Power Power conversion conversion efficiencyefficiency
Component Component number number
SafetySafety
Power factorPower factorVV
ii
SpaceSpace
CostCost
ReliabilityReliability
Heat dissipationHeat dissipation
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What issues are we facing in E27? What issues are we facing in E27?
• Component countComponent count
• SpaceSpace
• SafetySafety
• Power factorPower factor
• CostCost
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What components can we save for space? 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.
• TransformerTransformer
• Snubber circuitSnubber circuit
• Photo couplePhoto couple
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SafetySafety
隔離一定要用變壓器嗎 隔離一定要用變壓器嗎 ??
對於對於 LED LED 燈泡的應用可燈泡的應用可
以考慮不用變壓器隔離 以考慮不用變壓器隔離 !!
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What do we gain while removing What do we gain while removing transformer?transformer?
Space downSpace down
and and
Cost downCost down
Efficiency upEfficiency up 2~3%2~3%
20~30%20~30%
5~10%5~10%
Circuit with transformerCircuit with transformer
Circuit without transformerCircuit without transformer
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How do we overcome safety issue?How do we overcome safety issue?
UL1012:UL1012:
Material to meet: Material to meet: 5VA, 5VB, V-05VA, 5VB, V-0
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Does PF have to be 0.99 ??Does PF have to be 0.99 ??
EN61000-3-2, 電流諧波規範
From 南樺電機公司
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Classification of equipmentClass 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
經由白熱燈泡經由白熱燈泡 , , 放電燈或放電燈或 LEDLED 管而產生及管而產生及 // 或調整及或調整及 //或分散光學幅射為主要功能的設備 或分散光學幅射為主要功能的設備
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Limits for Class C equipment
Active input power >25 WFor 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;
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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.
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Limits for Class C equipmentLimits for Class C equipment
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Limits for Class D equipmentLimits for Class D equipment
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and current parameters
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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=0.99PF=0.99
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Which controller can achieve our target?Which controller can achieve our target?
MBI6901MBI6901Step-down, High efficiency, AC/DC Step-down, High efficiency, AC/DC LED ConverterLED Converter
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FeaturesUniversal input from 80Vac to 265VacEfficiency > 90% @ VAC=110V, 350mA, 6-LEDsSetting current accuracy within ±5%To driver external MOSFETHysteretic PFM improves efficiency at light loadingFull protection: Thermal/UVLO/OVP/LED open/short circuitAvailable in package: MSOP-8L
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Typical application circuitTypical application circuit
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Actual PictureActual Picture
With EMI solution With EMI solution
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Dimming applicationDimming application
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Passive-mode PFC applicationPassive-mode PFC application
AC Input
DC Output
EMI Filter
PFC
Main Application Circuit of MBI6901
R1Res Varistor
F1
C2
VDD1
VccG2
GATE3
CS4 GND 5
NC 6
NC 7
Dim 8U1
MBI6901
Q1
R5 L4
C8
D6
R4
C3
C4
+-
P2
DC Output
1
2
3
4
+
-
~
~
D1
DIODE BRIDGE
C5
C6 C7
R3
R2
ZD1
VSSVSS
VSS
GND
D5
D4
D3
D2
L3
L1
C1
R7 C9
R8
LN
P1
AC Input
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Design exampleDesign example
• Input voltage range: 85V/AC~265V/ACInput voltage range: 85V/AC~265V/AC
• Conversion Efficiency: Conversion Efficiency: 85% @ 110Vac, Full load 85% @ 110Vac, Full load 83% @ 220Vac, Full load83% @ 220Vac, Full load
• Conversion Power Factor: Conversion Power Factor: 0.92 @ 110Vac, Full load0.92 @ 110Vac, Full load 0.90 @ 220Vac, Full load0.90 @ 220Vac, Full load
• Output Current:Output Current: 400mA ±5% (ILED = 0.2 / RSEN) 400mA ±5% (ILED = 0.2 / RSEN)
• Safety and EMC: Safety and EMC: Passed UL-60950-1 and EN55015Passed UL-60950-1 and EN55015
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Waveforms of VWaveforms of VACAC&I&IACAC
VLED
VAC
IAC
VD7
•VAC = 110V / 60HzVAC = 110V / 60Hz
VLED
VAC
VD7
•VAC = 220V / 60HzVAC = 220V / 60Hz
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Measurement resultsMeasurement results
VAC VLED (V) ILED (mA) PIN (W) POUT (W) η (%) PFC THD (%)
85V / 60Hz 19.51 398 8.99 7.76 86.31 0.921 30.78
100V / 50Hz* 19.53 400 9.06 7.81 86.20 0.919 29.57
110V / 60Hz 19.56 403 9.18 7.88 85.83 0.915 31.86
135V / 60Hz 19.58 405 9.29 7.93 85.33 0.913 30.78
200V / 60Hz 19.61 411 9.57 8.06 84.25 0.91 29.83
220V / 60Hz 19.65 413 9.71 8.12 83.62 0.908 31.88
230V / 50Hz* 19.70 416 9.85 8.20 83.21 0.909 29.78
265V / 50Hz* 19.72 418 9.94 8.24 82.88 0.901 31.52
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Conduction Mode EMI Conduction Mode EMI
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Conduction Mode EMIConduction Mode EMI
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Active-mode PFC applicationActive-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%
R1
F1
VDD1
VccG2
GATE3
CS4
GND5
NC6
NC7
Dim8
U1
MBI6901
Q1
R7
L3
C10
D4
+-
P2
DC Output
1
2
3
4
+
-
~
~
D1
C4
C5 C9
R2
R5
GND
D3
L2L1
C1
C6
LN
P1
AC InputC2
R8
D2
V+
DIM
R9
C3
R6
Gate
R3
R4 Gate
VCS
VCS
LED+
LED+
GNDGND
R10
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Measurement resultsMeasurement results
VAC (V) IAC(mA) Pin (W) VLED (V) ILED (mA) η(%) PF THD (%)
85 125.06 10.63 24.03 356 80.48 0.968 22.33110 97.91 10.77 24.12 358 80.18 0.968 23.38135 81.41 10.99 24.31 361 80.0 0.965 24.22
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VVAC AC and Iand IACAC
•VAC and IAC waveformsVAC and IAC waveforms •Output waveformsOutput waveforms
VAC IAC
ILED
VLED
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DC/DC applicationDC/DC application
Vin1
VccG2
Gout3
CS4
GND5
NC6
NC7
Dim8
U1
MBI6901
Q1
RSEN L1
COUT1
DR
DF
RLIM
RGS
RG
+-
+LED-
CS
CG
GND
GNDGND
GND
CDIM
RS
GND1
RSEN2
ZD2CIN1
ZD1
+-
+VIN-
RPULL-UP
+-
+DIM-
COUT2COUT3
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Material source for safety UL1012 Material source for safety UL1012
耐燃材料 , 5VA/5VB, V-0http://b2b.chem366.com/cpView.aspx?id=181905
PBT美国 GE 17131塑胶原料 东莞市(立邦)塑胶原料实业有限公司
http://www.starmasterhk.com/tech_pro_2.htm星貿國際有限公司 / 星科貿易有限公司 ( 香港 )
…….
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Q&AQ&A