Design Power

Jayaprabha Kalappan

***********@*****.***

Home: 914-***-****

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Career Objective:

To contribute to the success of an organization by fully utilizing the skills and knowledge gained in the field of board level hardware design and development in a position offering growth and development.

Technical Skills:

• Proficiency in the designing of Switched Mode Power Supplies DC/DC Converters like Synchronous & Non-synchronous Buck, Boost Topologies

• Proficiency in the designing of Motor Drive circuits like H-Bridge circuits for Solar Tracking System

• Design & Development of Board Design for Analog, Mixed signals & Processor based products

• Circuit simulation tools, including P-Spice and PSIM & MATLAB-SIMULINK

• Schematic tools – OrCAD, ALTIUM DXP(Schematics &PCB)

• Worked with OrCAD PCB Layout

• Board Level & System Level Testing

• Teaching Experience for Engineering Graduates

Work Experience:

HCL Technologies Ltd, Ambattur, Chennai,India.

Designation: Member Technical Staff

Job Profile: 4+ years of experience in Board level Hardware Design

Project Details:

Project Name ULX-Single Phase Solar Inverter & TLX Inverter Support

Duration 7 months

Tasks Involved • Design and Analysis of Power module

• Field Failure analysis of Power module

• Validation of PWM Controller &Optocouplers

• Testing of Flyback supply section

Description:

Unilynx is a single phase solar inverter. The inverter consists of a converter (DC to DC) and an inverter (DC to AC) internally. The inverter draws DC power from the solar PV cells and it converts the DC to AC and fed in to the AC grid. It incorporates a Maximum Power point tracking algorithm which intends to draw the maximum power from the PV and improves the efficiency of the complete system.

The inverter has two variants high voltage (HV) and Medium voltage (MV) with respect to the input DC voltage range. Also the units are manufactured for different power ratings 1.8KW, 3.0KW, 3.6KW and 5.4KW. As the boards are concerned, there are two different variants HV and MV in DC module and three variants 1.8kW, 3.6kW and 5.4kW in AC module.

Project Name EPIC- Digital Cinema Camera

Duration 12 months

Tasks Involved • Power supply Design of RSB Board.

• Designing the Analog Circuitry for Lower IO Board- Snubber circuit design

• Component Engineering & Design analysis

• Testing of power supply Module & OMAP Board

• Power supply optimization for Dual CF & side CF

• Design of SATA devices in Dual CF Board

• Development of FFF BoardDesigning the schematics for power supply Design of RSB Board.

Description:

EPIC is a professional Movie Camera targeted for global market. It can be used either indoor or outdoor as a standalone camera unit or along with a group of cameras in genlock mode. It’s a modular camera system designed to provide the highest available image quality for a variety of professional motion picture, networked video and stills imaging applications.

The design concept is a range of camera “brains” that provide a user choice of image resolution and frame rates, which may be configured via common accessory modules to fit a variety of applications. Each camera brain will be capable of capturing video and still images; the specific maximum frame rate offered by each brain shall be controlled by the attached storage, internal memory buffer and/or limits established by the firmware as expressed via the User Interface.

The camera brain hosts the image sensor, the main electronics for the system like ISP & IOB for image processing and compression, OMAP for system control and audio sub-system. Audio sub system includes two boards Lower IO Board (LIOB) and Right Side Board (RSB).The brain has the provision for side handle which hosts the battery, switches & buttons and also bottom handle with some control buttons attached to it. The brain has the side expansion connector for attaching the storage media and display interface for EVF/LCD.Also the brain has the Rear expansion connector for attaching the storage media, battery pack and I/O expansion module

Project Name Design of DIGITAL PEN

Duration 7 months

Tasks Involved • Design of IR LED Driver.

• Timing Analysis for critical interfaces of OMAP Processor & CMOS Image sensor

• Design of power supplies.

• ORCAD schematics entry & Component Engg.

Description:

The XEPHY Pen is a device to capture the XEPHY code image printed on paper. The image sensor, optics and illumination system are used to capture the code image from the paper. The captured code image is decoded in real time using XEPHY code decode algorithm running in the application processor and result is stored in the system. The decoded result is transferred to the host system though USB or Bluetooth interface. The XEPHY Pen also supports the transfer of the data to the host system when in use. XEPHY Pen is powered by a battery. The battery is rechargeable either in the system or using external charger. USB power is used when the recharging of the battery is done in the system.

Project Name SF-70T-PV –Solar Tracking System

Duration 10 months

Tasks Involved • ORCAD schematics Entry.

• Component Engineering.

• Motor Control Testing using SUNDOG Unit

• MTBF Calculation for the SUNDOG Unit

• Design of H-Bridge circuit, optocoupler and IGBT circuits

Description:

The SF-70T-PV is comprised of a solar tracker and an open-loop tracker controller. The

SolFocus SF-70T-PV tracker is an intelligent dual axis tracker for photovoltaic arrays. Dual axis tracking maximizes the energy production from every installed watt, yielding up to 40% more energy production than fixed systems.

SolFocus PV trackers are engineered for optimal flexure, pointing accuracy, and tracking range to deliver the highest energy production for locations around the world. Using ephemeris-based open-loop tracking, the SF-70T-PV tracker can track the position of the sun in all environmental conditions. Tracker software (installed with the controller) automatically calibrates the tracker for maximum output power. Reliability is assured through a robust design and self-monitoring dynamic wind stow mode.

Project Name Remote Electric Power Unit (REPU)

Duration 10 months

Tasks Involved • Symbol creation & schematics entry – Altium & Design analysis

• Component Engineering like selection of Power Mosfets and other ICs

• Design of power supply & protection circuits

• Worst case analysis and timing analysis

Description:

The REPU is the main part of the Solid State Electrical Plant Management System for an aircraft. The scope of this unit in the system is to implement a secondary power distribution, i.e. this unit distributes electrical power to all final users in the aircraft and protects wiring from over current or other faults. Moreover, the REPU coupled with a Display is able to manage the basic plants of the aircraft.

The REPU will continuously monitor the status of the loads (normal, over current, arc fault, etc) and trip open when predetermined levels are exceeded. The REPU will transmit the system data to a Display where the data can be viewed along with any anomalies. The Display also provides an interface between the user and the ON/OFF status of the REPU power outputs. A serial communications bus will control the outputs and transmit the system data (status, current, voltage, etc). All events such as trips due to over-current will be initiated inside the REPU

Academic Background:

Year Program Board/University Percentage

2005-2007 M.E

( Power Electronics & Drives ) Anna University 76%

2000-2004 B.E

(Electrical & Electronics Engg.) Madras University 80%

1998-2000 Intermediate

(Class-XII) State Board 80%

1998 S.S.C

(Class-X) State Board 84.4%

M.E. Thesis:

“ANALYSIS OF BIFURCATION AND CHAOS IN CUK CONVERTER”

Description:

The CUK converter studied in this thesis is a very popular design choice for DC-DC converters, but its non-linear dynamics is seldom seriously analyzed. The analysis of bifurcation and chaotic behavior of a CUK DC-DC converter has been performed in this thesis. Simulation results are presented for (1) CUK converter under open loop condition,(2) Fixed Frequency current mode controlled CUK converter and (3) Free-running current mode controlled CUK Converter. In this project work, the Hopf bifurcation analysis of hysteretic current mode controlled CUK converter has been performed. For this, state space averaged model is used. Analysis of the describing autonomous equations reveals that the system loses stability via Hopf bifurcation. It is also shown that as the control parameters are varied the nominal periodic orbit undergoes a Hopf bifurcation, quasi periodicity and finally enters into chaotic regime. The MATLAB-SIMULINK simulation results obtained reveal the typical bifurcation from a stable equilibrium state to chaos, via limit cycles, and quasi-periodic orbits. Due to their simplicity, free-running switching converters are commonly used in the construction of low-cost power supplies.

Declaration:

The information given above is true to the best of my knowledge.

K.JAYAPRABHA

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