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

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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w w w . m b l o c k . c o m . t wP o w e r U p Y o u r L E D s

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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w w w . m b l o c k . c o m . t wP o w e r U p Y o u r L E D sFigure 2 – Illustration of the relative phase angle

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

Documents

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

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