U MAP Universiti Malaysia Perlis
INVENTORS
MOHO HAFIZ ARSHAO IAHARUDOIM ISMAIL AZRALMUKIIIM AZMI MOHO SYAHRIL MOOR SHAH OR. MUZAIIIIR ISA • MOHO ZULHISltAIil MOHO RADZI
CONTACT DETAILS
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SINGLE PHASE CASCADED MULTILEVEL INVERTER WITHSHEPWM
SWITCHING TECHNIQUE
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Collaborallonwllh:• leXsolar GmbH
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Strehlener StraBe 24 01069 DresdenUK Copyright No.: 284680292
PRODUCT DESCRIPTION
• Single Phase Cascaded Multilevel Inverter with Selective Harmonic Elimination Pulse Width Modulation (SHEPWM).
• Using SHEPWM switching technique, the selected harmonic order can be eliminated and can contribute to the low Total Harmonic Distortion (THD) for the voltage output waveform.
• The field programmable gate array (FPGA) use to generated SHEWPM switching pulses.
• Light and compact design allows the product to be portable.
• The energy from different renewable energy sources can be used simultaneously.
• This product can produce up to 9 levels output waveform with various frequencies and different switching pattern.
• Thus, it gives a lot of potential for research and educational application.
• Capable of generating 240 AC with a maximum power of 1500 Watt.
• Choose between different output levels, frequencies and multiple switching angles in real time
• LowerTHD
• Higher efficiency.
• Using low switching frequency
• Less weight
• Less cost
I
NOVELTIES
• Develop programming by using VERILOG VHDL program to generate multiple selected outputs waveform from 3 to 9 levels.
• Selected number of level from 3 to 9 with different frequency from 5Hz to 120Hz. Number of level and frequency will be display at the 7-segment.
• Selected single and multiple switching angles (switching pattern) for each level (from 1 to 3 from the quarter cycle of the waveform). This can be done by using selected level, switching and pattern button.
• Use with the different power source such as wind and solar energy.
• Transformerless.
Figure 1: Block Diagram
. Germany
_ COMMERCIAL POTENTIALS
• Great potential for education institution such as universities, colleges and the polytechnics that offer electrical and electronics courses for training or study.
• Residential or rural application in alternative energy.
II APPLICATIONS
• Renewable energy application
• Multilevel inverter design AC Drive
High Voltage
Peak Power: 1500W
• DC Input Voltage: 90VDC x 4Set
• AC Output Voltage: 240VAC
• AC Output Frequency: 10Hz - 90Hz
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U ·~MAP Universiti Malaysia Perlis
INVENTORS
lilt MooRHAFIZA MUHAMMAD IU,IMAPI MOHD SHUHloAN SALEH IU,iMAP) DR. BENEDICT RoGfRS ITIIt UnJnnIIy of
... chI.FI .. , UK) PROFESSOR UN II (Tt. UniWlralty of MlicUlrtlH', UK)
CONTACT DETAILS
MULTI-PHASE
SMOOTHED PARTICLE HYDRODYNAMICS
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T.I : +104-0185142 Fal: +OIM-UI5ON HN :. ... 01 .... 021011
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(SPH) MODELLING FOR LASER MICROMACHINING
Copyright Registration Number: 284680429
PRODUCT DESCRIPTION
This invention overcomes the problem to model the laser micromachining process by introducing meshless method. Conventional modelling methods using generated mesh have been problematic in capturing the melt splashing or droplets during the material removal in laser machining.
SPH is differ from the conventional methods due to the meshless characteristics which are able capture the physical process in laser micromachining with high accuracy down to micro/ nan a scale without requiring massive computer resources. It is also allows for flexibility in domain creation where water can be included underneath the metal to model wet machining.
_ COMMERCIAL POTENTIAL
This invention has high potential for laser machining industry which is useful in predicting the process parameters and product quality after laser processing for different type of materials.
II NOVELTIES
• The mesh less method, SPH is introduced forthe firsttime to capture the physical process in laser micromachining applications provides an important contribution to the field of laser processing,
• Meshless characteristics allows for flexibility in domain creation
• Able to model the physical process of laser micromachining with high accuracy Physical process to be captured In SPH model
Figure 1: The configuration of the laser and t:-'e workpiece.
Figure 2: The physical process in laser micro-
mach.ining and drilling process with a static beam,
(aj inItial arrangement (bj Partial penetration depth.
Figure 3: Mechanism of eiected molten metal behaviour In tube machining, (aj Ory machining
and (bj Wet machining
II PROCESS FLOW
This work developed a smoothed particle hydrodynamics (SPH) model to simulate the three- phase laser micro-machining process. The open-source code SPHysics is used to model the interaction between the laser beam and workpiece. This enables the melt flow behaviour in the non-linear pulsed fibre laser micro-machining process to be modelled. The developed model considers the conversion of laser energy into heat within a very thin surface layer, heat conduction into the parent material and the phase transition between solid, liQuid and vapour. Water is also incorporated in this model to help explain the mechanism in laser wet micromachining. It is demonstrated that the mesh less characteristics of SPH are able to model the droplets ejected from kerf where it is difficult for conventional modelling.
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IFigure 4: Cross section of the workpiece showing the phase changes. Full depth penetration with single pulse (Peak power, P, = 100 W, pulse duration, t = 0.15 ms).
Figure 5: Snapshots of melt ejection time history during wet cutting (water velOCity, Vw = 0.241 ms·'). (a) 0,15 ms (b) 0.175 ms (c) 0.2 ms and (d) 0,25 ms.
• Meshless (no mesh or grid required)
• Reduce time (mesh generation, computing time, trial time) Reduce cost (computing resources. trial cost)
• High accuracy (able to capture ejected droplets at scales as small as micro/nano scale)
In Collaboration with
N .• Rogers. B.D., and Li, L. Understanding the behaviour of pulsed laser dry and wet micromachining processes by multi-phase smoothed particle hydrodynamics (SPH) modelling, Journal of Physics 0:
I ,2013.46: p. 1-13. (IF: 2.528)
' _.MIII"mm.n N. and Li, L, Underwater femtosecond laser micromachining of thin n~inol tubes for medical coronary stent manufacture. Applied Physics A: Materials Science and Processing. 2012.107(4): p. 849-861. (IF:
N., Whitehead, D., Viejo. F., Boor. A .• Oppenlaendar. W .• Uu, Zoo and Li, L. Characteristics of picosecond iaser micromachining of nitinol and platinum for coronary slent applications, Applied Physics A: Ma·
Processing. 2011. 106 (3): p.607·617. (IF: 1.545) ,
D .• Boor. A.. and U. L, Comparison of dry and wet fibre laser profile cutting ofthin 316L stainless steel tUbeS for medical devica appli.ations. Journal of Materials Processing Technology, 2010.
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