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MLVR REV X8 Design documentation

By Peggy Rogers,2014-04-10 22:23
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MLVR REV X8 Design documentation

Design and development of driving and measurement

    hardware for the MLVR HB VS Converter: Rev X8

ENEL664 Special Topic

Hari Kallingalthodi

Student ID number: 39736811

    CONTENTS

I. Main PCB

1. Driving Circuit

    2. Interface side measurement 3. Output voltage and current measurement

    4. Power supply unit

II. Auxiliary PCB

    1. Fault multiplexer

    2. Future work

III. Reference

IV. Appendix

Introduction

    The project is to design and implement a simple prototype of MLVR Voltage Source Reinjection Converter in which the drive and measurements are done based on the TMS320F2812 Digital Signal Controller. The design is based on the Rev.X4 design submitted earlier but many changes have been made to the Rev.X4 design for the ease of hardware realization. Two PCB’s are made; one for the signal-level circuitry and DSP

    interface and the other consisting of connectors and system fault indication.

    The design has rolled through from X4 to X8, and the Rev.X8 design is explained in the rest of the report.

I. Main PCB

    1. Driving Circuit

     The drive signal from the JP508 is buffered through an inverting buffer U121 and it is isolated from the high voltage side using a Schmitt trigger output optocoupler. The input side of the optocoupler is operated from a 3.3V power supply and output side is driven from a +15V power supply. Drive signals for the Reinjection and main drives are taken through JP501 which mates with JP8 of the auxiliary board and given to the Semikron driver using BNC connectors.

    2. Interface side measurement and ZCD

     This includes the Zero crossing Detection, interface side measurement of three isolated voltages and three currents in the Phases A, B and C.

Zero crossing detection

    Precision zero crossing detectors come in a fairly wide range of topologies, some interesting, others not. One of the most common and is used for the application. The

    exclusive OR (or XOR) gate makes an excellent edge detector, as shown in the figure below