Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 66 views

    Exp.-6: Study of DC DC Converter: Electrical Drives Lab (ELE220A)

    Uploaded by

    m sri
    This document summarizes an experiment on DC-DC converters. It introduces DC-DC converters and their applications in motor control and power supplies. It describes the operating principle of converters using a switching device to control output voltage. It then provides details on calculating output voltage and current. Specific examples of a buck converter, which steps down voltage, and a boost converter, which steps up voltage, are examined. The document concludes by demonstrating speed control of a DC motor using a buck converter.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Exp.-6: Study of DC DC Converter: Electrical Drives Lab (ELE220A)

    Uploaded by

    m sri
    66 views16 pages
    This document summarizes an experiment on DC-DC converters. It introduces DC-DC converters and their applications in motor control and power supplies. It describes the operating principle of converters using a switching device to control output voltage. It then provides details on calculating output voltage and current. Specific examples of a buck converter, which steps down voltage, and a boost converter, which steps up voltage, are examined. The document concludes by demonstrating speed control of a DC motor using a buck converter.

    Original Description:

    Original Title

    Exp-6 DC-DC converter

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document summarizes an experiment on DC-DC converters. It introduces DC-DC converters and their applications in motor control and power supplies. It describes the operating principle of converters using a switching device to control output voltage. It then provides details on calculating output voltage and current. Specific examples of a buck converter, which steps down voltage, and a boost converter, which steps up voltage, are examined. The document concludes by demonstrating speed control of a DC motor using a buck converter.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    66 views16 pages

    Exp.-6: Study of DC DC Converter: Electrical Drives Lab (ELE220A)

    Uploaded by

    m sri
    This document summarizes an experiment on DC-DC converters. It introduces DC-DC converters and their applications in motor control and power supplies. It describes the operating principle of converters using a switching device to control output voltage. It then provides details on calculating output voltage and current. Specific examples of a buck converter, which steps down voltage, and a boost converter, which steps up voltage, are examined. The document concludes by demonstrating speed control of a DC motor using a buck converter.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 16

    Exp.

    - 6: STUDY OF DC DC CONVERTER

    Electrical Drives Lab (ELE220A)

    Subham Kumar Jalan


    EDM19D009

    Department of Electronics & Communication Engineering


    IIITDM Kancheepuram
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 1
    Presentation Layout

    ØIntroduction
    ØMerits and Demerits
    ØOperating Principle
    ØCalculation Work
    ØBuck Converter
    ØBoost Converter
    ØSpeed Control by Buck Converter
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 2
    Introduction
    • Converts fixed DC source into variable DC source
    simultaneously with step up and step down the
    voltage/current level.
    • DC equivalent to an AC transformer with variable
    turns ratio.
    • Works on high switching frequency (>10kHz).
    • Mainly, MOSFET or IGBT is used.
    • Applications
    1. Motor Control
    2. Voltage Regulators
    3. Power factor correction converters
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 3
    Introduction: Cont…
    • The purpose of this experiment is to efficiently
    control the speed of DC motor.
    • Moreover, it can also be used for variable DC
    application like power supply, etc.
    • Further, speed control of DC motor by buck
    converter (or Class-A chopper) is used when high
    voltage DC source is available with low voltage
    drives, whereas for low voltage battery source
    boost converter (or Class-B chopper) is used.
    • Additionally, speed control of DC motor by boost
    converter is also used for regenerative braking.
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 4
    Merits and Demerits
    Merits
    • High efficiency and wide range
    • High power density
    • Low cost
    • Easy to control
    • Minimum component used
    Demerits
    • Low gain
    • No isolation
    • High electromagnetic interference (EMI)
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 5
    Operating Principle
    • Switch SW is known as
    a “chopper” or “device”
    • Use MOSFET, or IGBT
    • Close for time t1
    – VS appears across R
    • Open for time t2
    – Voltage across R = 0
    • Repeat
    • Period T = t1 + t2

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 6


    Calculation Work
    Average output voltage
    t1
    1
    Va = vO dt
    T 0
    t1
    1
    Va = VS dt
    T 0
    t1
    Va = VS = ft1VS
    T
    Va = kVS
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 7
    Calculation Work: Cont…
    Average load current RMS output voltage
    1
    Va kVS kT
    Ia = = VO =
    1 2
    v dt
    2

    R R T
    O
    0
    T = period 1
    kT
    t1 1 2

    k = = dutycycle VO = 2
    VS dt
    T T 0
    f = frequency VO = kVS

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 8


    Buck Converter
    Buck converter is chosen in applications where the
    output voltage needs to be always less than the input
    voltage in the same polarity and is not isolated from
    the input.

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 9


    Buck Converter: Cont…
    Switching frequency:- 10kHz, Duty cycle:- 40, Stop Time:- 30e-4 sec

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 10


    Buck Converter: Cont…

    Vin:- 100 V, Pulse width:- 40, and Vout:- 38.12 V


    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 11
    Boost Converter
    Boost converter is chosen in applications where the output
    voltage needs to be always greater than the input
    voltage in the same polarity and is not isolated from the
    input.

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 12


    Boost Converter: Cont…
    Switching frequency:- 10kHz, Duty cycle:- 40, Stop Time:- 250e-4 sec

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 13


    Boost Converter: Cont…

    Vin:- 100 V, Pulse width:- 40, and Vout:- 164.2 V


    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 14
    Speed Control by Buck Converter
    Simulation Stop Time:- 1000e-4 sec

    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 15


    Thank You
    Tuesday, September 22, 2020 Subham Kumar Jalan (EDM19D009) 16

    You might also like