CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady POWER ELECTRONICS CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady

Relationship of Power Electronics 4/20/2017

POWER ELECTRONICS TECHNOLOGY As the technology for the power semiconductor devices and integrated circuit develops, the potential for applications of power electronics become wider. There are already many power semiconductor devices that are commercially available, however, the development in this direction is continuing. The power semiconductor devices or power electronic converter fall generally into four categories : -AC to DC Converter (Controlled Rectifier) -DC to DC Converter (DC Chopper) -AC to AC Converter (AC voltage regulator) -DC to AC Converter (Inverter)  The design of power electronics converter circuits requires design the power and control circuits. The voltage and current harmonics that are generated by the power converters can be reduced or minimized with a proper choice of the control strategy.

Power Electronics Application Power Electronics defined as the application of solid-state (devices) electronics for the control and conversion of electric power. Power electronics have already found an important place in modern technology and are now used in a great variety of high-power product, including heat controls, light controls, electric motor control, power supplies, vehicle propulsion system and high voltage direct current (HVDC) systems.

POWER ELECTRONIC SWITCHING DEVICES 1.Uncontrolled turn on and off (Power Diode) 2.Controlled turn on uncontrolled turn off (Thyristors) 3.Controlled turn on and off characteristic (Power Transistor, BJT, MOSFET, GTO, IGBT) 4.Continuous gate signal requirement (BJT, MOSFET, IGBT) 5.Pulse gate requirement (SCR(Silicon-Controlled Rectifier) , GTO) 6.Bidirectional current capability (TRIAC) 7.Undirectionalcurrent capability (SCR, GTO, BJT, MOSFET, IGBT)

Diagram Block of Converters

Diode Rectifiers. A diode rectifier circuit converts AC voltage into a fixed DC voltage. The input voltage to rectifier could be either single phase or three phase.   AC to DC Converters. An AC to DC converter circuit can convert AC voltage into a DC voltage. The DC output voltage can be controlled by varying the firing angle of the thyristors. The AC input voltage could be a single phase or three phase. AC to AC Converters. This converters can convert from a fixed ac input voltage into variable AC output voltage. The output voltage is controlled by varying firing angle of TRIAC. These type converters are known as AC voltage regulators. DC to DC Converters . These converters can converte a fixed DC input voltage into variable DC voltage or vice versa. The DC output voltage is controlled by varying of duty cycle.

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Examples of Some Applications 4/20/2017

History of Power Electronics 4/20/2017

Types of Power Devices 4/20/2017

General Purposes Diodes 4/20/2017

Thyristors 4/20/2017

GTOs 4/20/2017

Power Ratings of Devices 4/20/2017

Ratings of Power Devices 4/20/2017

Devices Symbols and Characteristics 4/20/2017

Devices Symbols and Characteristics 4/20/2017

Applications of Power Devices 4/20/2017

Control Characteristics of Devices 4/20/2017

Control Characteristics of Devices 4/20/2017

Switching Characteristics 4/20/2017

Ideal Characteristics 4/20/2017

Voltage and Current Waveforms 4/20/2017

Diode Rectifiers 4/20/2017

Ac-dc Converter Input voltage AC to DC Converters -Single phase, half wave AC to DC converter Input voltage Waveform of single-phase, half wave AC to DC converter α Output average voltage : rms value of Output voltage :

AC-DC Converter

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1. AC to DC Converters -Single phase, Full wave AC to DC converter The average output voltage can be found from : 4/20/2017

AC to DC Converters Single phase, Full wave AC to DC converter 4/20/2017

3 Phase Half-Wave Uncontrolled Rectifier with Inductive Load 4/20/2017

3 Phase Half-Wave Uncontrolled Rectifier with Inductive Load 4/20/2017

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Three Phase Controlled Rectifier with Resistive Load 4/20/2017

Three Phase Controlled Rectifier with Inductive Load 4/20/2017

3 Phase Half-Wave Controlled Rectifier With Inductive Load 4/20/2017

4/20/2017 AC to DC Converters -Three-phase, Half wave AC to DC converter with inductive load If the phase voltage is : van= Vm Sin(wt). The average output voltage for a continuous load current is : 4/20/2017

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AC to DC Converters -Three-phase, Half wave AC to DC converter 4/20/2017

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AC-AC Converter 4/20/2017

IGBT in DC-DC Converter 4/20/2017

DC-AC Converter 4/20/2017

UPS System 4/20/2017

RMS Values of Waveforms 4/20/2017

RMS Values of Waveforms 4/20/2017

Power Converter System 4/20/2017

Drive System 4/20/2017

Smart Power System 4/20/2017

Summary Power electronics uses low power electronics (ICs, microprocessors, controllers ), and switching power devices for power converter and/or processing from one form of power to another. The characteristics of the power devices play a major role in the speed and effectiveness of the power conversion. 4/20/2017