Post on 16-Jan-2016
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
International LED Drive Control and Application Technology Seminar23/4/21 3
OutlineOutline
Solution for Dimmable MR16 Application
PSR PFC CV controller for 2-stage Application
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
Compatibility of Dimmer and E-Transformer
TriAC Dimmer Electronic Transformer
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
SY8726A Specifications
Pinout
International LED Drive Control and Application Technology Seminar
Schematic Diagram
Boost+buck Topology
Startup bleeding
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
Typical Waveforms
VIN=220VAC
CH1(blue) : VBOOST_IN CH2(cyan) : VBOOST_OUT
CH3(pink) : IBOOST_L CH4(green): IBUCK_OUT
IBUCK_OUT=500mA
International LED Drive Control and Application Technology Seminar
Dimming Curve
International LED Drive Control and Application Technology Seminar
Compatibility List
International LED Drive Control and Application Technology Seminar23/4/21 16
OutlineOutline
Solution for Dimmable MR16 Application
PSR PFC CV controller for 2-stage Application
International LED Drive Control and Application Technology Seminar23/4/21 17
BridgeBridge Flyback, PFC, CVFlyback, PFC, CV HF Buck, CCHF Buck, CC
PSR CV eliminating opto-coupler
SY5018SY5018
International LED Drive Control and Application Technology Seminar23/4/21 18
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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.
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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.
International LED Drive Control and Application Technology Seminar
Design Example
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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%
International LED Drive Control and Application Technology Seminar
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
International LED Drive Control and Application Technology Seminar
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%
International LED Drive Control and Application Technology Seminar
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
larry.huang@silergycorp.comlarry.huang@silergycorp.com
Thanks!Thanks!
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