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SINGLE PHASE SERIESAND PARALLEL INVERTER

Md mustafa kamal

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Introduction

A device which converts DC into AC isknown as an inverter. It may be definedas the reverse process of rectification.

The block diagram representation maybe consist of 

DC Source

Oscillator circuit

A step up transformer

AC output

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Classification

An inverter can broadly classified into

two types•Voltage source inverter

•Current source inverter

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Single Phase Series Inverter

 The circuit diagram of series inverter is

shown in figure. It consist of LoadResistance R in series with Commutatingcomponents L and C. The value of L and Care so chosen that the RLC circuit forms anunder damped circuit. The two thyristors

 T1 and T2 are turn on one by one so that

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Load Current waveform of the seriesinverter

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 The analysis of basic seriesinverter

• Finding the load current i(t)

• Voltage across inductance

• Voltage across capacitor

• Output frequency

Example: Calculate the output frequency of a series inverter with the following

parameters: Inductance L=6mH,capacitance C=1.2 microfarad, loadresistance R=100 ohms, Toff =0.2ms. If theload resistance is varied from 40 to 140ohms, find out the range of outputfrequency.

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 The analysis of basic seriesinverter

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 The analysis of basic seriesinverter

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 The analysis of basic seriesinverter

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Single Phase Parallelinverter

 The Basic Inverter circuit for a singlephase parallel inverter is shown in figure. Itconsist of two thyristors T1 and T2 andinductor L and capacitor commutated withcentre tapped transformer. The out putvoltage and current are V0 and i0 respectively.

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Operation of Single PhaseParallel inverter

 The operation of the inverter canbe explained in different modes as

underMode I :

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Operation of Single PhaseParallel inverter

Mode II :

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Operation of Single PhaseParallel inverter {Mode II}

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Operation of Single PhaseParallel inverter

Mode III :

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 voltages

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Analysis of Parallel Inverter

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Analysis of Parallel Inverter

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APPLICATIONS

Industrial applications of invertersare

Adjustable speed ac drives

Induction heating

Standby power supply

UPS for computersHVDC transmission lines

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 THANKS