Date post: | 07-Mar-2016 |
Category: |
Documents |
Upload: | anilgshastry |
View: | 216 times |
Download: | 0 times |
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 1/31
Design of Digital Control circuit
for power Power FactorCorrection in power
converters( Boost) and reductio
of EMISUBM
"#&''
(C%
Under t+e &uidance of ,Dr'M Ma+es+ ME-P+'D
Professor-Depart.ent of EEE-PESI/ - B"&"0O%E
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 2/31
Introduction Most of electrical and electronics e4uip.ent wor5ing on dc - w+ic+ get conn
.ains using diode recti7er at t+e input'
/+e non8linear nature of diode recti7er causes signi7cant line current +ar.onic
t+e6 degrade power 4ualit6- increases losses'
/+erefore- stringent international standard IEC 2***889 is i.posed to res
allowed /;D ;ence- +ar.onic reduction circuits .ust <e incorporate in Power E
Boost PFC converters wit+ digital controller is one of t+e .ost suita<le conver
power factor (PF) and decrease t+e total +ar.onic distortion (/;D) of its input c
"n adaptive control tec+ni4ue and DSP8<ased DCM detection .et+od to pr
control of t+e <oost PFC for wide range of load'
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 3/31
O<=ective of Pro=ect /o i.prove power 4ualit6 for <oost PFC converters operating in .i:ed co
For t+e "C8DC <oost PFC converter <6 introducing a novel digital >ero8cu
tec+ni4ue'
Several e:isting .et+ods to detect >ero inductor current e.plo6 co.ple:
and1or au:iliar6 circuit re4uire.ents for DCM detection-eit+er digital tec+
circuit'
;ig+ speed DSP co.parator is used to detect t+e >ero inductor current e
for costl6 au:iliar6 winding'
separate DCM and CCM average current .ode co.pensators are used -d
detected .ode of operation'
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 4/31
Power Factor:
?
@+ere 5A ? cosA is t+e displace.ent factor-
is distortion factor'
/+e displace.ent factor and distortion fact
relates /;D and power factor directl6 given<6
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 5/31
E:a.ples of dierent current s+apes s+ow t+edierent distortion factors and displace.ent
factors
(a) k θ <1, k d <1, (b) k θ =1, k
d <1
(c) k θ <1, k d =1, (d) k θ =1, k
d =1
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 6/31
Overall block diagram
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 7/31
Boost converter as a power factorcorrector
".ong 8<asic power converters <uc5- <oost- <uc58<oost- t+e <oost converter is
for use in i.ple.enting PFC'
Because series inductor will ac+ieve s.aller current ripple and easier to i.ple.e
current .ode control'
"dvantages of t+e <oost PFC converter includes
Its low cost and less co.ple:it6
;ig+ switc+ing fre4uencies- allowing a reduction in t+e p+6sical si>e of capacito
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 8/31
Operation of t+e PFC Boost Converte
Positive line input +alf8c6cle operation of t+e PFC <oost converter wit+ switc+ G cl0 isstoring energ6 and output capacitor C is disc+arging energ6 to load'
Sa.e positive line input +alf c6cle operation of t+e PFC <oost converter wit+ switc
Inductor 0 is suppl6ing energ6 to t+e load and c+arging C at a voltage greater t+avoltage'
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 9/31
@avefor.s of <oost converter
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 10/31
"verage Current Mode Control• The principle of average current mode control is to control the average inductor current I
L to be propo
to the rectified input voltage.
• Current tracking forces the average inductor current to track the current reference so that it has th
shape as the input voltage, as shown in Fig. This task gives the input a unity PF.
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 11/31
Types of Inductor CurrentModes
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 12/31
EIS/I& S!S/EM
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 13/31
PROPO!" #T!$
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 14/31
Small-signal Models for the CCM and CM !oost "#C
Converters
/+e lineari>ed s.all8signal .odel of t+e CCM <oost PFC control8to8output /ransfer function is given <6
/+e lineari>ed s.all8signal .odel of t+e DCM <oost PFC control8to8output
/ransfer function is given <6
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 15/31
C$rrent Com%ensator esign in CCM&
the designed continuous%time transfer function of the P& compensator is given by
The 'ilinear Transformation is used to transform the controller into a discrete e(uivalent, through t
transformation
S6ste. <loc5 diagra. of CCM <oost PFC converter
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 16/31
Discreti>ation of t+e CCM co.pensator wit+ t+e Bilinear /ransfor.ation is given <6
C$rrent Com%ensator esign in CM
In t+e sa.e fas+ion t+at t+e CCM current co.pensator was designed- t+e DCM
co.pensator is designed in M"/0"B to ac+ieve t+e desired response c+aracte
given <6
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 17/31
Design of Voltage Compensator
/+e control s6ste. includes a discrete proportional8integral voltage co.pensaw+ic+ regulates t+e converterJs output voltage
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 18/31
Sim$lation modal
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 19/31
Sim$lation 'es$lts
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 20/31
Sim$lation 'es$lts
&nput voltage at different loads.
output voltage wavefor. of Boost converter
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 21/31
voltage error
output of voltage co.pensator
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 22/31
%ecti7ed input voltage
%eference current
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 23/31
Boost Inductor Current wavefor.
current error
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 24/31
output wavefor. of co.parator for DCM detection'
output wavefor. fro. current co.pensators
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 25/31
/riangular carrier wavefor. for DP@M
P@M single for MOSFE/
switc+
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 26/31
(a) "t load 23*@ (<) "t load H@
Input current and input voltage at dierent loads
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 27/31
(a) "t load H@ (<) "t load 23*
/;D at dierent loads
Su..ar6 of power factor and /;D .easure.ents for various output power for
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 28/31
Conventional digital controller "ro%osed digital controller
"o$t(att) T)" *+ Power factor T)" *+ Power factor
* -./ 0.1234 4./4 0.1114
1+ 5.4 0.1161 /.36 0.1114
. 4.64 0.114 /.41 0.111
/+ /.1 0.114 /.45 0.1111
/. /.-- 0.11 /.01 0.1111
0++ /.65 0.111/ 0.11 0.1111
+. /.4- 0.1113 0.16 0.1111
+*+ /./5 0.1113 0.14 0.1111
+. /.06 0.113 0.10 0.1111
Su..ar6 of power factor and /;D .easure.ents for various output power for
eac+ of t+e Conventional Digital- and Proposed Digital Controllers (vac ? 9* #- f l
? 2* ;>)
COC0USIOS
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 29/31
• "s a contri<ution to +ig+84ualit6 input current for electronic devices- t+is
contri<uted control tec+ni4ues ena<ling i.prove.ents in power 4ualit6'
• In t+is regard- a novel adaptive MCM control tec+ni4ue for Boost PFC converter
wide load range +as <een presented'• In particular- a DCM detection .et+od +as <een proposed using DSP integr
t+ere<6 ena<ling si.pli7cation and cost8reduction over e:isting DCM and >ero
.et+ods'
• B6 using 5nowledge of t+e detected .ode of operation- MCM controller wa
appropriate CCM or DCM co.pensator selection for t+e detected .ode of operat
• I.prove.ents in power 4ualit6 <6 lowering /;D and i.proving power factor i
conventional digital control tec+ni4ue +as <een reali>ed <6 si.ulating pr
M"/0"B8SIMU0I$ environ.ent'
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 30/31
/+is section provides possi<le reco..endations to e:pand on t+e wor5
dissertation'
• /+e +ardware .odel of proposed s6ste. can <e i.ple.ented using /M
series DSP as a controller'
• Controller can <e designed wit+ still reduced Switc+ing Fre4uencies, wit
switc+ing speed- t+e DSP would +ave .ore ti.e to service t+e >ero8cu
and t+erefore provide potentiall6 greater power 4ualit6
Future scope
7/21/2019 Digital Controller for the Mixed Conduction
http://slidepdf.com/reader/full/digital-controller-for-the-mixed-conduction 31/31
/ ;"
$ ! O U