## Power ElectronicsPower Semiconductor DevicesThyristors - Silicon Controlled Rectifiers (SCR's) - BJT - Power MOSFET - Power IGBT and their characteristics and other thyristors - Basic theory of operation of SCR - Static characteristics - Turn-on and turn-off methods - Dynamic characteristics of SCR - Turn-on the Turn-off times - Salient points.Devices and Commutation CircuitsTwo transistor analogy - SCR - UJT firing circuit - Series and parallel connections of SCR's - Snubber circuit details - Specifications and ratings of SCR's, BJT, IGBT - Numerical problems - Line commutations and forced commutation circuits.Single Phase Half Controlled ConvertersPhase control technique - Single phase Line commutated converters - Mid point and Bridge connections - Half controlled converters with Resistive, RL loads and RLE load - Derivation of average load voltage and current - Active and reactive power inputs to the converters without and with free wheeling diode - Numerical problems.Single Phase Fully Controllers ConvertersFully controlled converters, Mid point and Bridge connections with Resistive, RL loads and RLE load - Derivation of average load voltage and current - Line commutated inverters - Active and Reactive power inputs to the converters without and with free wheeling diode, Effect of source inductance - Derivation of load voltage and current - Numerical problems.Three Phase Line Commutated ConvertersThree phase converters - Three pulse and six pulse converters - Mid point and bridge connections, Average load voltage with R and RL loads - Effect of source inductance - Dual converters (both single phase and three phase) - Waveforms - Numerical problems.AC Voltage Controllers and Cyclo Converters AC voltage controllers - Single phase two SCR's in anti parallel - With R and RL loads - Modes of operation of Triac - Triac with R and RL loads - Derivation of RMS load voltage, current and power factor. Waveforms - Firing circuits - Numerical problems - Cyclo converters - Single phase mid point cyclo converters with resistive and inductive load (Principle of operation only) - Bridge configuration of single phase cyclo converter (Principle of operation only) - Waveforms.ChoppersChoppers - Time ratio control and current limit control strategies - Step down choppers-Derivation of load voltage and currents with R, RL and RLE loads - Step up chopper - Load voltage expression.Morgan's chopper, Jones chopper and Oscillation chopper (Principle of operation only)- Waveforms-AC chopper, Problems.InvertersInverters - Single phase inverter - Basic series inverter - Basic parallel capacitor inverter-Bridge inverter-Waveforms-Simple forced commutation circuits for bridge inverters - McMurray and McMurray Bedford inverters-Voltage control techniques for inverters-Pulse width modulation techniques-Numerical problems. |

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### Contents

UnitVII Chapter4 | 1-4 |

Chapter 2 Single and Threephase Controlled Converters 2 1 to 2112 | 151 |

Amit Residency 412 Shaniwar Peth Pune 411030 M S Im | 260 |

Chapter 3 AC Voltage Controllers and Cyclo Converters 3 1 to 3 | 3-3 |

Chapter5 Inverters 51to562 | 5-1 |

Appendix B Important Laplace Transform gelations B1teB3 | A-3 |

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### Common terms and phrases

AC voltage controller anode average output voltage average value base drive capacitor current capacitor voltage cathode circuit diagram circuit-I commutation circuit Controlled Converters current flows cycloconverter DC supply device duty cycle Equivalent circuit Example firing angle forward biased Fourier series freewheeling diode frequency full converter full wave controller gate drive given by equation half bridge inverter harmonic Hence above equation IGBT inductive load LC circuit line voltage load current load inductance load resistance load voltage maximum mode modulation index MOSFET motor negative half cycle o(av o(rms output voltage waveform Power Electronics pulse width modulation Putting values quadrant regenerative braking resistive load rms output voltage rms value semiconverter shown in Fig shows the circuit shows the waveforms single phase snubber Solution square wave step down chopper supply current supply voltage switch transistor triac turn-off turn-on value of output Vo(av voltage is given waveform of Fig