FINAL REPORT

FINAL REPORT - 250 WATT PREREGULATOR USING UC3854 CHIP...

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1 250 WATT PREREGULATOR USING UC3854 CHIP FINAL REPORT PREPARED FOR EE567 INTEGRATED POWER ELECTRONICS STATE UNIVERSITY OF NEWYORK AT BUFFALO BUFFALO, NY I&STRUCTOR: DR. D C HOPKI&S Dept. of Electrical Engineering University at Buffalo PREPARED BY ASHWIN KRISHNAN HARIHARAN Graduate, Dept. of Electrical Engineering University at Buffalo and ABILASH ETHANUR THUPPALE Graduate, Dept. of Electrical Engineering University at Buffalo May 2009
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2 &OTICE This report was prepared by Ashwinkrishnan Hariharan and Abilash Ethanur Thuppale, in the course of performing work for and sponsored by the State of New York and the university at buffalo. The opinions expressed in this report do not necessarily reflect those of the Sponsors or the State of New York, and reference to any specific product, service, process, or method does not constitute an implied or expressed recommendation or endorsement of it. Further, the Sponsors and the State of New York make no warranties or representations, expressed or implied, as to the fitness for particular purpose or merchantability of any product, apparatus, or service, or the usefulness, completeness, or accuracy of any processes, methods, or other information contained, described, disclosed, or referred to in this report. The Sponsors, the State of New York, and the project group make no representation that the use of any product, apparatus, process, method, or other information will not infringe privately owned rights and will assume no liability for any loss, injury, or damage resulting from, or occurring in connection with, the use of information contained, described, disclosed, or referred to in this report.
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ABSTRACT A 250 W Pre-regulator for the purpose of supplying constant output power at a voltage of 380V is designed using a UC3854 IC chip that can change the power factor of an input. The UC3854 chip provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. In addition, the UC1854 contains a power MOSFET compatible gate driver, line anticipator, load-enable comparator, low-supply detector, and an over-current comparator. The UC3854 uses average current-mode control to accomplish fixed frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients. The UC3854's high reference voltage and high oscillator amplitude minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200 kHz. The UC3854 can be used in single and three phase systems with line voltages that vary from 75 to 275 volts and line frequencies across the 50Hz to 400Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC3854 features low starting supply current. This
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This note was uploaded on 02/04/2011 for the course EE 587 taught by Professor Dr.mohammedsafiuddin during the Spring '11 term at SUNY Buffalo.

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FINAL REPORT - 250 WATT PREREGULATOR USING UC3854 CHIP...

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