b-10.dc-ac pure sine wave inverter using bubba oscillator

Download B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

Post on 04-Apr-2018

389 views

Category:

Documents

34 download

Embed Size (px)

TRANSCRIPT

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    1/51

    DC/AC Pure Sine WaveInverter

    Section-B:

    Batch No: 10

    ANIL .R(07241A0258)MAHENDRA.P(07241A0275)

    VAMSI KRISHNA.L(07241A02B4)

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    2/51

    Inverter

    Power inverters are devices which can convert

    electrical energy of DC form into that of AC.

    On the market today are two different types of power

    inverters, modified sine wave and pure sine wave

    generators. These inverters differ in their outputs,

    providing varying levels of efficiency and distortion

    that can affect electronic devices in different ways.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    3/51

    OUR OBJECTIVE

    Our goal is to fill a niche which seems to be lacking

    in the power inverters market, one for a fairly

    efficient, inexpensive inverter with a pure sine wave

    output.

    Utilizing PWM and analog components, the output

    will be a clean sinusoid, with very little switching

    noise, combined with the inexpensive manufacturing

    that comes with an analog approach.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    4/51

    COMPOSITION

    The major task of generating a pure sine wave is viewedas the summation of outputs obtained from:

    Bubba oscillator(Reference sine wave generator)

    Carrier wave generator Pulse width modulation

    H-bridge with MOSFET drivers

    Snubber circuit and filters

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    5/51

    Bubba Oscillator

    The Bubba Oscillator is a circuit that provides a

    filtered sine wave of any frequency the user desires

    based upon the configuration of resistors and

    capacitors in the circuit. The circuit completes this task with four operational

    amplifiers that either buffer or amplify the signal and

    produce a total 180 shift.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    6/51

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    7/51

    Output

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    8/51

    Carrier Wave Generator

    Generating a sine wave at 50Hz requires both the

    reference sine wave and a carrier wave at the

    switching speed of the power supply.

    Carrier waves can be either saw tooth or triangularsignals; in this case, a triangular wave will be used.

    The operation of this device is based on basic Schmitt

    Trigger and Integrator circuits.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    9/51

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    10/51

    Output

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    11/51

    Pulse Width Modulation

    Analog PWM control requires the generation of both

    reference and carrier signals that feed into a

    comparator which creates output signals based on the

    difference between the signals. The reference signal is sinusoidal and at the

    frequency of the desired output signal, while the

    carrier signal is often either a sawtooth or triangular

    wave at a frequency significantly greater than the

    reference.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    12/51

    When the carrier signal exceeds the reference, the comparator

    output signal is at one state, and when the reference

    is at a higher voltage, the output is at its second state.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    13/51

    H-Bridge Configuration

    An H-bridge converter is a switching configuration

    composed of four switches in an arrangement that

    resembles an H.

    By controlling different switches in the bridge, apositive, negative, or zero potential voltage can be

    placed across a load.

    The use of P-channel MOSFETs on the high side and

    N-Channel MOSFETs on the low side is easier.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    14/51

    H-Bridge with N-channel

    MOSFETS

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    15/51

    The MOSFET driver on the left side of the bridge will

    receive a square wave and the right side will receive the

    PWM signal.

    Square wave will control the polarity of the output sine wave,

    while the PWM signal will control the amplitude.

    Now, using an H-Bridge MOSFET configuration, and

    utilizing both the above PWM signal and the square wave

    generated, we can obtain unfiltered output signal at the load.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    16/51

    Snubber circuit

    One of the major factors in any electronic device is its

    ability to protect itself from surges that could damage

    the circuitry.

    In the case of the inverter, inductive loads can causespecial problems

    To combat this problem snubber circuits can reduce

    or eliminate any severe voltages and currents.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    17/51

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    18/51

    Filters

    In this inverter , we preferpassive filter than active

    filters.

    L-C filter

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    19/51

    Block diagram of pure sine wave

    inverter

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    20/51

    Total Circuit Diagram

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    21/51

    Final Output at the filter

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    22/51

    Applications

    The purpose of a DC/AC power inverter is typically to take

    DC power supplied by a battery, such as a 12 volt car battery,

    and transform it into a AC power source emulating the power

    available at an ordinary household electrical outlet.

    Power inverters are used today for many tasks like powering

    appliances in a car such as cell phones, radios and televisions.

    They also come in handy for consumers who own camping

    vehicles, boats and at construction sites where an electric grid

    may not be as accessible to hook into.

    Inverters allow the user to provide AC power in areas where

    only batteries can be made available, allowing portability and

    freeing the user of long power cords.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    23/51

    Simulation part of

    the circuits

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    24/51

    Simulation of bubba oscillator

    circuit

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    25/51

    Output

    R = 33Kohm, C = 100nF then Freq = 50HZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    26/51

    R = 26.7Kohm, C = 100nF then Freq = 60HZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    27/51

    R = 15Kohm, C = 150nF then Freq = 70HZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    28/51

    Simulation of carrier wave circuit

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    29/51

    OutputRtot = 100 Kohm , C = 200 pF, Freq = 2 KHZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    30/51

    Rtot = 8.2 Kohm , C = 100 pF, Freq = 50 KHZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    31/51

    Rtot = 50 Kohm , C = 150 pF, Freq = 8 KHZ

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    32/51

    Simulation of PWM circuit

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    33/51

    Output

    B.O : R=33Kohm, C=100nF

    C.G : Rtot = 50Kohm , C= 200pF

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    34/51

    B.O : R=26.7Kohm, C=100nF

    C.G : Rtot = 50Kohm , C= 150pF

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    35/51

    B.O : R=15Kohm, C=150nF

    C.G : Rtot = 100Kohm , C= 200pF

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    36/51

    B.O : R=15Kohm, C=150nF

    C.G : Rtot = 8.2Kohm , C= 100pF

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    37/51

    List of major components

    Op amps:

    LM348

    TL084MC3302

    IR2110(Mosfet driver)

    IR549P Mosfet

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    38/51

    LM348

    Pin diagram : Ratings :

    Supply voltage :

    Vcc : -18 to +18 V

    Input voltage :Vi : -18 to +18 V

    Differential Input Voltage :

    Vi(Diff) : 36 V

    Operating & storage

    Temperature :

    0 to +70 C & -65 to 150 C

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    39/51

    TL084

    Pin Diagram : Ratings :

    Supply voltage :

    Vcc : -18 to +18 V

    Input voltage :

    Vi : -15 to +15 V

    Differential Input Voltage :

    Vi(Diff) : -30 to +30 V

    Power Dissipation :

    P(tot) : 680mw

    Operating & storageTemperature :

    0 to +70 C & -65 to 150 C

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    40/51

    MC3302

    Pin Diagram : Ratings :

    Supply voltage :

    Vcc : -15 to +15 V

    Input Differential VoltageRange :

    Vidr : 30 V

    Power dissipation :

    Pd: 1 W

    Operating & storage

    Temperature :

    -40 to 85 C & -65 to 150 C

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    41/51

    IR2110

    Pin Diagram : Ratings :

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    42/51

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    43/51

    Hardware work

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    44/51

    Bubba Oscillator

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    45/51

    Carrier wave generator

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    46/51

    PWM pulse generator

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    47/51

    H-Bridge configuration of MOSFETS

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    48/51

    Output of bubba oscillator circuit

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    49/51

    Output of carrier wave generator

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    50/51

    Conclusion

    After the total connections of internal

    circuits,the obtained reference sine wave and

    triangular waves are sent to the PWM

    generator circuit,from which the accuratePWM pulses are obtained with disturbances

    which couldnt properly drive the MOSFET

    drivers to give the desired output.

  • 7/30/2019 B-10.Dc-Ac Pure Sine Wave Inverter Using Bubba Oscillator

    51/51

    Scope of the project

    This project is a stepping stone to a cheaperand efficient pure sine wave inverter.

    Using the data collected in this report as well

    as the schematics and recommendations theproduct produced here can be improved

    upon.

    Simple additions such as circuit protection anda closed loop control system could greatly

    improve the performance of this project.