design and implementation of cyclo converter for high frequency applications
DESCRIPTION
designing a cycloconverterTRANSCRIPT
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DESIGN AND IMPLEMENTATION OF
3- PHASE CYCLO-CONVERTER FOR HIGH
FREQUENCY APPLICATIONS
PRESENTED BY
ASHOK KUMAR C U* THAMARAICHSELVAN.S
Mr. MUSTHAFA. P M.E (GUIDE)
ASSISTANT PROFESSOR
DEAPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING (EEE)
VEL TECH MULTI TECH DR. RR AND DR.SR ENGINEERING
COLLEGE, CHENNAI-600062
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ABSTRACT
• Designing a 3 phase cyclo-converter using H-bridge inverterwhich could generate the constant voltage at load (RLC load)and it can be regulate and maintain
• Switching device- MOSFET as an advantage of high switchingspeed over IGBT and it can be operate at high frequencyapplications
• Purpose – To convert the low frequency Alternatingcurrent(LFAC) to high frequency alternating current(HFAC).
• Single input multiple output(SIMO) system is used withoutany switching loss
• This design system can be operate at unity power factor
• To verify the design – power circuit-MATLAB simulink andcontrol circuit- Keil software using Microchip PIC16F877A
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BLOCK DIAGRAM
AC VOLTAGE SOURCE
DIODE RECTIFIER
H-BRIDGE INVERTER
RLC LOAD
TRIGGERING CIRCUIT
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Cyclo-Converter Circuit- Existing Topologies
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Cyclo-Converter circuit- Proposed Topologies
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Comparison Between Proposed And Existing System
S.NO PROPOSED SYSTEM EXISTING SYSTEM
1 Single input multi output (SIMO) isused with wide range of frequencywithout switching losses
Single input single output(SISO) system isused
2 Obtain a constant voltage and it canbe regulate and maintain
Obtain a constant voltage but cannot beregulate and maintain
3 Less physical damage More physical damage
4 RLC load is used Inductive load is used
5 harmonic distortion is 0.2459% Harmonic distortion is 0.72%
6 Cost is less Cost is more
7 MOSFET with pair of diode is used to reduced the switching loss
IGBT is used which results is appreciable switching loss
8 Operate at Unity power factor Power Factor may be vary (0.85 to 0.95)
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Modules Involved
Hardware Required:
LC filter Circuit Diode Rectifier H-bridge Series Resonant Inverter RLC Load MOSFET ( 6 nos) LED
Software Used :
MATLAB/SIMULINK software Keil μVersion 4
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Operation Filter Circuit- To remove the ripple from the AC source and fedto the rectifier
Diode Rectifier- RC snubber circuit which eliminates noisefrom the input signal and also converts the AC source to DCsource
H-bridge inverter- A series resonant inverter for determiningthe resonant Frequency at RLC load and converts DC source toAC source
Switching Circuit: MOSFET is used instead of IGBT. MOSFEThas an advantage of High Switching speed and it can be used inhigh frequency applications
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Design Specifications
1. Input source Specifications
• Input Voltage(Vs ) = 110V
• Frequency ( f ) = 50HZ
• Delay angle (α ) = 0
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2.LC Filter Circuit Specifications
Inductor filter = 1mH
Capacitor filter = 2μF
Purpose : To remove the unwanted noise andripple from the input source
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3. Diode Rectifier Specification
Type of Rectifier : Centre Tapped DiodeRectifier
Power Electronics Device : DiodeForward Voltage = 1VNo. of Diode = 4
Purpose : Snubber Circuit – To reduce the total Harmonic distortion (THD) and
convert AC to DC source
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4. H- Bridge Inverter Specifications
Design of MOSFET
Topologies (N) =( 2 * n ) + 2Wheren - output inverter at nth stageFor n=2
N = ( 2 *2 ) +2 = 6No. of MOSFET used = 6
Purpose : Switching Pulse Depends upon Duty Cycle of theSystem
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5. RLC Load Specifications:
Resistance (Ro ) = 9.5 Ω
Inductance ( Lo ) = 60 μH
Capacitor ( Co ) = 0.45 μF
Purpose : To obtain the Resonant Frequency at the load
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Design Calculations Steps
Step 1: To determine the DC voltage link (Vdc )
Step 2: To determine the duty cycle of switchingcircuit for 3 branches and also design thelogical representation of switching circuit
Step 3: Compute the resonant frequency (fo) and Time(T0)
Step 4: Determine the output voltage(V0 ) andcurrent(I0 )
Step 5: Determine the power factor ( cosθ )
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Step 1 :To find the DC voltage link (Vdc )
Vm – Input Peak Voltage = √2 Vs = 155V
Vdc = (2 √2 Vs )/ π = 140V
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Step 2 : Determine the Duty Cycle of switchingcircuit and also logical Design of switchingcircuit
Duty Cycle (§ )= Ton/ T
T= Total Time = Ton + Toff
Ton= On time in ms ; Toff = off time in ms
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BRANCH 1 : Q1 , Q2 are in the same branch
%501002
1
211)()(
;100)(
1)(
1)(
DutyCycle
msoffTonTT
T
onTDutyCycle
msoffT
msonT
onQuantisati
Q2 Must be Complement of Q1
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BRANCH 2 : Q3 , Q4 are in the same branch
%401002
8.0
22.18.0)()(
;100)(
2.1)(
8.0)(
DutyCycle
msoffTonTT
T
onTDutyCycle
msoffT
msonT
Q3 Must be Complement of Q4
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BRANCH 3 : Q5 , Q6 are in same branch
%201002
4.0
26.14.0)()(
;100)(
6.1)(
4.0)(
DutyCycle
msoffTonTT
T
onTDutyCycle
msoffT
msonT
Q5 Must be Complement of Q6
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Step 3: Compute the Resonant Frequency ( fo )and Time(T ):
sec/3^10192
6^1045.06^1060
1
;1
;1
tanRe_tan_
_
rad
LC
CL
ceaccapacitivecereacinductive
resonanceAt
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sec30000
11
302
3^10192
2
foT
Time
KHzfo
frequency
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Step 4: To determine output Voltage( Vo ) and outputcurrent (Io )
;2)^1
(2^
);1
(
;
:_
110
2
)02sin(01110
π2
α)Sin(2
π
α1VV
_
SO
CLRZ
CLjRZ
Z
VoIo
MeasuredCurrent
VVo
voltageOutput
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AIoCurrent
Z
Z
C
C
L
L
FCHLR
125.9
110)(
5.9)(
;2)^57.1152.11(2^5.9
;57.111
;6^1045.0502
11
;52.11
;6^1060502
45.0;60;5.9
Design parameters
Inductive Reactance
Capacitive reactance
Impedance
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Step 5: To determine the power factor ( cos θ )
)(1_
1)3015.0cos(cos_
;3015.05.9
05.0tan
5.9
05.057.1152.11
tan
unityfactorpower
factorpower
R
X
R
X
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MATLAB/SIMULINK SIMULATION RESULT
1. PROPOSED CYCLO-CONVERTER CIRCUIT
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2. DESIGN LOGIC DIAGRAM OF SWITCHING CIRCUIT
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3. INPUT VOLTAGE AND CURRENT
INPUT VOLTAGE
INPUT CURRENT
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4. DC VOLTAGE LINK
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5. SWITCHING PULSE OF MOSFET
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6. OUTPUT VOLTAGE AND CURRENT AT 50% DUTY CYCLE
OUTPUT VOLTAGE
OUTPUT CURRENT
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7. Output Voltage and Current at 40% duty cycle
OUTPUT VOLTAGE
OUTPUT CURRENT
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8. Overall Simulation Result
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Photograph of Hardware module
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Applications
High Frequency Applications:
• High power low speed AC motor drive
• Metal heat treatment
• Thermal treatment process such as forging and casting
• Electromagnetic induction based plasma generationprocess
• High-speed dissolution process for the new materialsand melting process of semiconductor manufacturing
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High frequency Industrial Applications
• Induction Heating purpose
• Supply power to Aircraft Engine
• Gearless cement mills,
• Steel rolling mills,
• Ore grinding mills,
• Pumps and compressors,
• Mine winders
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Conclusion
In that system ,we describes how to design
and implement an 3 phase cycloconverter.
The main objective is convert To low
Frequency AC input into High Frequency AC
output. The main feature of the inverter is to
reduced switch count and lightweight. To
overcome that voltage spike and high losses,
we are using MOSFET as switching devices.
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Future Enhancement
• By using Cycloconverter, we can develop usinginverter named as Cyclo-inverter for industrialpurpose which can be design and simulateusing PROTEUS 7.9 software.
• By specifying a multi-output series-resonanthigh frequency inverter, an inverter isobtained fulfilling the requirements.
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Literature Survey
• V.K Mehta and R. Mehta, Principles of Electronics(MulticolorIllustrative Edition),Copy right-2004,2003,2002, S. Chand and CompanyLtd, New Delhi.
• M. H. Rashid, Power Electronics Circuits, Devices and Application 6thedition, Copy right 2009, Prentice Hall, Inc Upper Saddle River, NJ.
• A. K. Chattopadhyay, „„Cycloconverters and cycloconverter-feddrives—A Review.’’ J. Indian Inst. Sci.
• T. J. Rao, „„Simplified control electronics for a practicalcycloconverter.’’ Int. J. Electronics
• B. R. Pelly, Thyristor Phase-Controlled Converters andCycloconverters, John Wiley, New York, 1971
• J. Davies and P. Simpson, Induction Heating Handbook. New YorkMcCraw Hill (U.K.) Limited.
• Vineeta Agarwal and Sachin Nema, “Resonant AC to AC”, ISIE, 20-23June, 2005, Vol.2, Dubrovnik, Croatia
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