international led drive control and application technology seminar 1 novel driver solution for led...

International LED Drive Control and Application Technology Seminar 1

Novel Driver Solution for LED Lighting

2015.4.17

Novel Driver Solution for LED Lighting

2015.4.17

International LED Drive Control and Application Technology Seminar23/4/21 2

OutlineOutline

Solution for Dimmable MR16 Application

PSR PFC CV controller for 2-stage Application


OutlineOutline



International LED Drive Control and Application Technology Seminar

Dimmers and Their Limitations

Leading edge dimmer

Leading edge dimmers must never be used with a capacitive load extremely high instantaneous current when turning onCheap and easy to get


Trailing edge dimmer

Trailing edge dimmers are not supposed to work with an inductive loadA MOSFET and potentially a commercial IC are needed. Relatively expensive

Dimmers and Their Limitations


Electronic Transformers

The term "electronic transformer" is really a misnomer - it is actually a switch mode power supply (SMPS). A minimum load current is required to assure electronic transformer's functionality

Capacitive load


Compatibility of Dimmer and E-Transformer

TriAC Dimmer Electronic Transformer


ET behaves as a capacitive load to TRIAC

Compatibility of Dimmer and E-Transformer

TRIAC Current

TRIAC Trigger Voltage

ET Input Current

ET Output Voltage

International LED Drive Control and Application Technology Seminar 23/4/21

Dimmable MR16 LED Driver

12V AC

AC Input

Electronic Transformer

Rectifier SY8726A

Dimmer


SY8726A Specifications

Pinout


Schematic Diagram

Boost+buck Topology

Startup bleeding


Efficiency with Dimmer and E-transformer

VIN(VAC) Pin(W) Vout(V) Iout(mA)Efficiency(%)

200 8.47 12.22 491 70.80%

220 8.48 12.19 490 70.43%

240 8.53 12.18 492 70.25%

Philips ET-E60 Full Angle


Typical Waveforms

VIN=220VAC

CH1(blue) : VBOOST_IN CH2(cyan) : VBOOST_OUT

CH3(pink) : IBOOST_L CH4(green): IBUCK_OUT

IBUCK_OUT=500mA


Dimming Curve


Compatibility List


OutlineOutline




BridgeBridge Flyback, PFC, CVFlyback, PFC, CV HF Buck, CCHF Buck, CC

PSR CV eliminating opto-coupler

SY5018SY5018


Constant ON time to achieve high PF

PSR eliminating opto-coupler

QR-mode operation

Excellent short output protection

Good transition performance

Advanced design on fast start up

Features


Constant on time to achieve high PFC

, ( ) 2 sin(2 )IN AC AC ACV t V f t

As long as tON is fixed, although tS(t) is varied with t, high power factor is achieved.

2ACT

ont sT

pi. ss

p

NiN

Constant ON time to achieve high PF

)(

)2sin(

2

2

)(

)(

2

1)(

2,,

, ttL

ttfV

tt

t

L

tontVtI

SM

ONACACIN

S

ON

M

ACIN

ACIN


PSR eliminating opto-coupler

Primary side control

VAUX

IPRI

VG

ISEC

IOUT

tDIS

IPP

ISP

VAUX=VOUT×(NAUX/NS)

Current zero point

VIN

GND

VSEN

SY5018

VSEN_UP

VSEN_DOWN

NAUX

DAUX RAUX

CIN

AUX

S

VSEN_DOWN

VSEN_DOWNVSEN_UPREFOUT N

N)

R

RR(VV

VREF is voltage reference, NS is secondary turns of transformer, VSEN is voltage feedback.


QR-mode operation

VAUX

VG

t2tS

t1 t3

Delay

In order to ensure valley turned ON, t3 should be around 2 tDelay

QR mode is adopted to decrease switching loss, it’s achieved by delay after VSEN detects zero-crossing signal


Excellent short output protection

VOUT

VCC

VGATE

zoom in

Short output

When output is shorted, voltage of VSEN is nearly zero, and IC will work at max toff mode. After 32 times max toff , IC hiccup.

VISEN

VISEN_LIMIT

GATE

MIN TONMAX TOFF


Good transition performance

Better performance on Transition

VSEN

VCOMP

Full load transition to light load

VSEN,HIGH

VREF

VISEN

Maxtoff

VSEN

Vcomp

VSEN,LOW

VISEN

VREF

Light load transition to Full load

VISEN_MAX

IC set VFB,HIGH above VREF IC set VFB,LOW below VREF

When VSEN touch VSEN,HIGH, IC work at Max toff mode to decrease output energy

When VSEN touch VSEN,LOW, IC work at Max Ipeak to expedite output energy

Output voltage could be clamped at VFB,HIGH and VFB,LOW when transition


Advanced design on fast start up

VAUX

VSEN

VISEN

VFB,LOW

t1 t

t

t

Between 0~t1, IC work at peak current mode to speed up the output voltage rise. After VSEN higher than VFB,LOW, IC work at constant mode to realize high PF.

AS the supply voltage at the point VFB,LOW is already enough to supply IC, so smaller capacity of CVIN is needed, so, start up could be very fast.


Design Example


COMP ISEN

VSEN

GND NC

NC VIN

DRV

F11A/250V

L1/1mHφ12

C1330nF/CBB

C2330nF/CBB

R2300K

R3300K

D2RS1M

C32.2nF

R4100K

CY1102

Q110N65

D1KBP207

D3RS1M

R620/1206

C34.7 µF25V

R920k

C10220nF

R7300K

R819K

R10/10

R11/20K

MUR460C8

470uF63V

VOUTPFC+

VOUTPFC-InPut90~264Vac

T1PQ2620360uH

U1/SY5018

R120.68

R130.68

O

R551K

38:17:7

R15.1K

1

2

3

4

5

6

7

8

Circuit Diagram


Load Regulation

Load Regulation

45.0

46.0

47.0

48.0

49.0

50.0

51.0

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90

IO(A)VO(V

)

VIN=90Vac

VIN=110Vac

VIN=220Vac

VIN=264Vac

VIN=90V VIN=110V VIN=220V VIN=2640V

IO(A)

VO(V)

IO(A)

VO(V)

IO(A)

VO(V)

IO(A)

VO(V)

0.80 49.2 0.80 49.3 0.80 49.5 0.80 49.5

0.70 49.3 0.70 49.3 0.70 49.5 0.70 49.6

0.60 49.3 0.60 49.4 0.60 49.6 0.60 49.6

0.50 49.4 0.50 49.4 0.50 49.6 0.50 49.6

0.40 49.5 0.40 49.5 0.40 49.6 0.40 49.6

0.30 49.6 0.30 49.6 0.30 49.6 0.30 49.6

0.20 49.8 0.20 49.8 0.20 49.7 0.20 49.6

0.10 50.0 0.10 49.8 0.10 49.7 0.10 49.7

0.05 49.9 0.05 49.7 0.05 49.8 0.05 49.8

0.00 49.9 0.00 49.9 0.00 50.1 0.00 50.1


Steady Performance

VIN(Vac) VO(V) IO(A) PIN(W) PF THD(%) EFF(%)

90 49.3 0.8 44.53 0.996 7.4 88.57%

110 49.3 0.8 43.91 0.994 9.1 89.82%

132 49.4 0.8 43.61 0.992 8.8 90.62%

176 49.5 0.8 43.40 0.983 9.1 91.24%

220 49.6 0.8 43.49 0.968 11.5 91.24%

264 49.7 0.8 43.61 0.966 10.6 91.17%


Start up & Shut down

VIN=90Vac Start up time=450mS

VIN=110Vac Start up time=330mS

CH1(Blue):VVIN CH3(Pink):VOUT CH4(Green):IOUT


Load Transition

VIN=110Vac

VIN=220Vac

CH3(Pink):VOUT CH4(Green):IOUT

Full load Null load

Full load Null load

Full loadNull load

Full loadNull load

Over shoot 15% Under shoot 20%

Over shoot 15% Under shoot 20%


SilergySilergySilicon Energy-Powering the FutureSilicon Energy-Powering the Future

Total power solution provider Total power solution provider targeting energy conservationtargeting energy conservation

Any enquiry please contact me by Any enquiry please contact me by

[email protected]@silergycorp.com

Thanks!Thanks!

23/4/21 31

international led drive control and application technology seminar 1 novel driver solution for led...

Documents