A Prototype model of Field Programmable Gate Array (FPGA) Based Nine Level Cascaded Multilevel Inverter is to be designed and Implemented to produce AC output voltage of desired magnitude and frequency.
2. A Prototype model of Field Programmable Gate
Array (FPGA) Based Nine Level Cascaded
Multilevel Inverter is to be designed and
Implemented to produce AC output voltage of
desired magnitude and frequency.
Xilinx software is used in FPGA for producing
SPWM gating signals to the MOSFETs for
producing the required AC output voltage.
2
3. B.Shanthi, Natarajan.S.P, “FPGA based Fuzzy
Logic Control for Single Phase Multilevel
Inverter”.
International Journal of Computer Applications
(0975-8887)
Volume9-No:3,November 2010.
3
4. Azli, N.A. and Yatim, A.H.M.2001 Modular Structured Multilevel
Inverter (MSMI) for high power Multilevel Inverter (MSMI). In:
Proceedings of the 4th IEEE International Conference on Power
Electronics and Drive Systems PEDS’01, Vol.2, 598-604.
Lai, J.S.and Peng, F.Z.: Multilevel Converters-A New Breed of Power
Converters. In: IEEE Trans. Ind. Application., May/June 1996, Vol. 32,
509-517.
Carrara, G. and Gardella, S., Marchesoni M.,Salutari R.,Sciutto G.. A
New Multilevel PWM Method: A Theoretical Analysis. In: IEEE Trans.
Power Electron, July 1992, Vol. 7, 497–505.
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5. 5
A proto type Single Phase Nine Level Cascaded Multilevel
Inverter with Sinusoidal Pulse Width Modulation
(SPWM) technique is implemented.
A Cascaded Multilevel Inverter consists of four full wave
bridge inverters connected in series on the AC output side.
Each bridge can create three different voltage levels in ac
output allowing an overall Nine Level AC output voltage.
FPGA Programmable Logic Device developed by Xilinx is
used for SPWM generator to supply the approximate signals
to the Power Inverter Switches.
8. Proto type model of a Single Phase Nine Level
Cascaded MLI has been fabricated for an output
voltage of 48v(Peak-Peak). The MOSFET
switches are used in the power circuit.
Gating signals are generated from FPGA
Controller. Driver circuit is used to amplify the
signals.
Hardware model consists of the following circuits
Power circuit.
FPGA controller circuit.
Driver and opto coupler circuit.
Power supply unit.
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11. FPGA controller is used to generate sinusoidal
pulse width modulation gating signals to the
switches.
Xilinix software is used for SPWM generator to
supply the approximate signals to the power
inverter switches.
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13. An FPGA consists of an array of logic blocks,
surrounded by programmable I/O blocks, and
connected with programmable interconnect. A
typical FPGA contains from 64 to tens of thousands
of logic blocks and an even greater number of flip-
flops.
Each logic cell can independently take on any one
of a limited set of personalities. The individual cells
are interconnected by a matrix of wires and
programmable switches.
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14. Key components and features
Clock source.
Switches and leds.
Character led screen.
Rc232 serial port.
Ps/2/mouse/key board port.
Analog to digital converter & digital to analog
converter.
Pwm generator.
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15. * 100,000-gate Xilinx Spartan-3E XC3S100E FPGAin a 144-Thin
Quad
Flat Pack package (XC3S100E-TQ144)
# 2,160 logic cell equivalents
# Four 18K-bit block RAMs (72K bits)
# Four 18x18 pipelined hardware multipliers
# Two Digital Clock Managers (DCMs)
32 Mbit Intel Strata Flash
* 3 numbers of 20 pin header to interface VLSI based
experiment modules
8 input Dip Switches
* 8 output Light Emitting Diodes (LEDs)
* On Board programmable oscillator (3 to 200 MHz)
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16. 16x2 Alphanumeric LCD
* RS232 UART
* 4 Channel 8 Bit I2C based ADC & single Channel DAC
* PS/2 Keyboard/Mouse
* Prototyping area for user applications
* On Board configuration flash PROM XCF01S
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17. Opto coupler is used to isolate the control circuit
from power circuit.
An Driver circuit is designed to connect the gate
directly to a voltage bus with no intervening
resistance other than the impedance of the driver
circuit switch.
Gate driver acts as a high-power buffer stage
between the PWM output of the control device and
gates of the primary switching MOSFET (or) IGBT.
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18. Isolate the control circuit from power circuit.
The 6N137 consist of a high emitting diode and a one chip
photo IC. This unit is 8−lead DIP package.
Pin Details
1 : N.C.
2 : Anode
3 : Cathode
4 : N.C.
5 : GND
6 : Output(Open collector)
7 : Enable
8 : VCC
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22. Single Phase Cascaded Nine Level Inverter with
Sinusoidal Pulse Width Modulation (SPWM)
technique is implemented by using FPGA controller.
It consists of four full bridge inverters connected in
series on the AC output side.
Each bridge can create three different voltage
levels (+Vdc,0,-Vdc) in ac output allowing an
overall nine level ac output voltage.
22
24. It is used to supply dc output voltage to the Inverter and FPGA driver
circuit.
RATINGS
Primary Voltage = 230v AC
Secondary Voltage = 0-9 v AC and 15-0-15v AC
Regulator
IC - 7805 and 7812 = Positive Voltage Regulator (+5v and
+15v).
IC - 7812 = Negative Voltage Regulator (-15v)
Diode = 1N4007
Capacitor = 4700µf/16v,4700µf/25v and 10µf/63v
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37. The performance of multilevel inverter (MLI) with
fundamental and PWM switching schemes are
studied through simulation using Matlab/Simulink.
It is observed that for Nine Level Multilevel Inverter,
the THD is less in the case of PWM switching
scheme. It is further identified that fundamental
switching scheme gives better performance as the
number of levels increases.
37
38. B,shanthi,natarajan.S.P,” fpga based fuzzy logic control for single phase
multilevel inverter”,international journal of computer applications(0975-8887)
volume 9- n0:3,november 2010.
Azli, N.A. and Ning W.S. 2004 Application of Fuzzy Logic in Regulating a
Multilevel Inverter output. In:Proceedings of 2004 International Conference on
Power System Technolpgy, Singapore, 21-24.
Azli, N.A. and Wong, S.N. 2005 Development of a DSP based Fuzzy PI
Controller for an Online Optimal PWM Control Scheme for a Multilevel Inverter.
In: Proceedings of IEEE International Conference on Power Electronics and
Drive Systems PEDS’05, 1457-1461.
Carrara, G. and Gardella, S., Marchesoni M.,Salutari R., Sciutto G.. A New
Multilevel PWM Method: A Theoretical Analysis. In: IEEE Trans. Power Electron,
July 1992, Vol. 7, 497–505.
Yan Deng, Hongyan Wang, Chao Zhang, Lei Hu and Xiangning He. 2005
Multilevel PWM Methods Based on Control Degrees of Freedom Combination
and its Theoretical Analysis. In: Proceedings of the IEEE IAS Conference
Record no.: 0-7803-9208-6 /05, 1692 – 1699
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