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8/14/2019 Control of Boost CRM PFC Converters
1/23
1/23
Prof. Ying-Yu Tzou
808DSP/FPGA
http://pemclab.cn.nctu.edu.tw/
Lab-808: Power Electronic Systems & Chips Lab., NCTU, Taiwan
Digital Voltage Control of Boost CRM PFC AC/DC
Converters with TRIAC Phase Control Dimmer
LAB808
NCTU
Lab808:
Power Electronic Systems & Chips, NCTU, TAIWAN
Depart. of Electrical Engineering,
National Chiao Tung Univ., Hsinchu, Taiwan
8/14/2019 Control of Boost CRM PFC Converters
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Contents
Introduction
TRIAC Phase Control Dimming Method Digital Voltage Control Loop Design
Simulation and Experimental Results
Conclusion
8/14/2019 Control of Boost CRM PFC Converters
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TRIAC Dimming Control Circuit
)(tvin
)(tvtriac
)(tG
Delay
Line Voltage and Dimming Waveforms
AC
DIM
BRIGHT k250R1
k3.3R2
nF100C1
DIAC
TRIAC
GK
A
Basic TRIAC Dimmer
ci
cv
The role of R1 to adjust the size of the capacitive current
Delay time of the decision by the C1 and (R1+R2)
121 C)R(RT
)(tvin
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TRIAC Dimmer Fired with Ideal Line Voltage in Different
Load Conditions
(a) resistive load
(b) inductive load (c) capacitive load
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LM3445 Triac Dimmable Offline LED Driver (NS)
Features:
Triac dim decoder c ircuit for LED dimming
Application voltage range 80VAC 270VAC Capable of contro ll ing LED currents greater
than 1A
Adjustable switching frequency
Low quiescent current
Adaptive programmable off -time allows forconstant r ipple current
Thermal shutdown
No 120Hz flicker
Low profile 10 pin MSOP Package
Patent pending drive architecture
Applications:
Retro Fit Triac Dimming
Solid State Lighting
Industrial and Commercial Lighting Residential Light ing
8/14/2019 Control of Boost CRM PFC Converters
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LT3799 Offline Isolated Flyback LED Controller with
Active PFC
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Digital vs. Analog PFC Control ler
Digi tal control provides flexibility for contro l algori thm realization
Synchronous current sampling and feedback signal reconstruct ion
Interleaved control for load current sharing
Robust performance for line and load variations
Efficient optimization across the entire load curves
(a) Analog PFC Controller (b) Digital PFC Controller
Iin
IL
D
CSLV
in
Kv
Vref
Vv-sam
RviRvfC
vfVp
Viref
Vc-sam
Ki
PWM
EA1
EA2
Rcz C
cz
Rci
Vc Vpwm
PWM
Vout Vout
Vref
Vv-samViref
Vc-sam
Vpwm
Vp
A/D
A/D
ILI
in
Vin
L
D
CSinVinV
inV
inV
Vc
)1()(
)()1()(
4
43
4
43
kVK
KKT
kVK
KKkVkV
c
opwmpwm
MULTMULT
A/D
samvsamv
samvpp
VTKkVKTK
kVKkVkV
212
1
)1()(
)()1()(
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Digital PFC Controller for LED Lighting Applications
85~265V
50~60 Hz
Digi tal PFC
controller
Digital
PWM
Controller
Digital
PWM
Controller
Digital
Lighting
Controller
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Proposed Digital Control Scheme for CRM Boost PFC
Converters
oC
DL
Q
)(tvin
)(tiL )(tiD
Q
i
)(tVi
oV
)(tiin
LR
3R
4R
1R
2R
refvVoltage Loop Controller
S Q
R Q
][* nibL
ZCD(t)
][nVcomp
)(tVo
sR
A/DA/D
D/A
inC
TRIAC
DIMMING
LC Low-Pass Filter
][nVo
][nVerr
)(tVi
][nVi
)(* ti bL
)(tisw
)(tio
ConductionAngle
)(t
ZCDR
zD
refZV ,
8/14/2019 Control of Boost CRM PFC Converters
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Current Control Strategies for Boost PFC Converters
LRfC
fL D
S
PFCController
iL
oV
rV
iave
iL
Peak Current Control
iave
Boundary Control Mode (CRM)
iavehigh reflow ref
Variable Hysteresis Control
TON
iave
Average Current Control
iref
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Comparison of PFC Technologies
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Small-Signal Modeling of Boost PFC Converters
Boost single-phase PFC converter with an inner current loop and an outer voltage loop.
Small-signal model of the PFC converter
)(sZin
)(sZin
InputImpedance ofPFC Converter
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Input Impedance In Consideration of Input Filter
Q
DL
PFC
Controller
Li
ov
*
ov
TRIAC
Dimmer
gvInput Impedance'
inZ
)()(1
)()('
ssZCC
sZsZ
inacdc
inin
)1
(1
)(
)(
)()(
2
nl
s
z
l
s
in
inin
LgR
Rs
sp
gR
R
sI
sVsZ
)(sHc
sL1
sR
)(sIin)(sV
in
m
o
V
V
)(sIR refl
)(sL
(a) The ringing input current greater than holding current ofTRIAC (b) The ringing input current less than holding current of TRIAC.
8/14/2019 Control of Boost CRM PFC Converters
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LC Filter with Damping Resistor Circuits
LPFL
LPFC
damperR
)(tvin
+
-
)(tIin
FB+
PFC
PowerSource
+TRAICDimmer
L
C
damperR
)(tvtriac
+
-
)(tIin
FB+
PFC
PowerSource
+
TRAICDimmer
Small-signal equivalent circuit of the boost PFC converter.
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Output Power as a Function of Conduction Angle
)degree(
2
T
Full power
Dimming state
(a) Full load and half load input voltage waveform.
The linear area of output power is from the conduction angle 30 degreeto 150 degree.
When the conduction angle becomes smaller (
8/14/2019 Control of Boost CRM PFC Converters
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Dimming with Variable DC Link Voltage
DC-link voltage as a function of conduction angle.
is the conduction angle, b is a parameter to adjust the drop slop. The dc link voltage decrease from conduction angle 90 degree to 0
degree.
The minimum dc link voltage must greater than maximum input voltage,since the PFC is a boost circuit.
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Modeling amd Control of the PFC Preregulator
(a) Detail of the resistor emulator control scheme.(b) Ideal waveforms with no ripple on the error amplifier.
(c) Real waveforms.
Low-pass filter corner frequency
Maximum power that complies with IEC 61000-3-2 regulations for different corner frequencies
of the voltage regulator.
VREF
vo
C2
R2vea
B
Current Loop
Voltage Loop
Sinusoidalwaveform
Multiplier
vea
Current reference
Control SignalVoltage Loop
1
2
RRAR
222
1
CRfC
Vea vea(t)
CurrentReference
CurrentReference
)sin( tVin
)sin( tk
VV inea )sin( t
k
VV inea
)sin( tVin Sinusoid Sinusoid
R1
voi1
i1
0 10 20 30 40 50 60 70 80 90 100500
1000
1500
2000
2500
3000
3500
4000
P(W)
AR
fC=1kHz
fC=500Hz
fC=100Hz
(c)
(a)
(b)
X
F f th di it l lt l i
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Frequency responses of the digital voltage loop gain
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Simulation Results of Steady-State Responses
Simulation results of steady-state response of the input line current and the inputvoltage through the TRIAC dimmer with a rated load of 25 W.
(a) no damping resistor. (b) with a 1 k damping resistor.
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Simulation Results of Transient Responses
Simulation results of transient response of the output voltage for dimming time is0.1s. Load changing from 25 W to 4 W
(a) Constant dc-link voltage. (b) Variable dc-l ink voltage.
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System Parameters and Experiment Setup
Monitor PC
Emulator
TMS320F2812
TRIAC
AC InInterfaceCircuitFLYBACK
Converter
LEDsLoad
DC power supply
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Experimental results for the dimmable LED system with
digital PFC control at different phase control angles.
150
90
30
(a)
(b)
(c)
0 20 40 60 80 100 120 140 160 1800
5
10
15
20
25
30
35
40
45
50
Conductin Angle (degree)
OutputPower(W
)
Dimming Curve
Output pow er as a function of phase conduction angle.
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Conclusion
Wide Dimming Control Range 5~100% Rated Power
No Flickering
Digital PFC Control Scheme for TRIAC Dimming Control
Passive Damping Technique to Reduce TRIAC Ringing
Variable DC-link Voltage Modulation Method
Experimental verification has been carried out on a DSP(TMS320F2812) controlled PFC CRM Converter.