Transcription of Pulse Width Modulated (PWM) Drives
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Pulse Width Modulated (PWM) Drives
Pulse Width Modulated (PWM) DrivesAC Drives Using PWM TechniquesPower Conversion UnitThe block diagram below shows the power conversion unit inPulse Width Modulated (PWM) Drives . In this type of drive, adiode bridge rectifier provides the intermediate DC circuitvoltage. In the intermediate DC circuit, the DC voltage is filteredin a LC low-pass filter. Output frequency and voltage iscontrolled electronically by controlling the Width of the pulses ofvoltage to the , these techniques require switching the inverterpower devices (transistors or IGBTs) on and off many times inorder to generate the proper RMS voltage GeneratorThis switching scheme requires a more complex regulator thanthe Variable Voltage Input (VVI).
Sensorless Vector Control, Flux Vector Control, and Field Oriented Control. • Volts/Hertz control is a basic control method, providing a variable frequency drive for applications like fan and pump. It provides fair speed and starting torque, at a reasonable cost. • Sensorless Vector control provides better speed regulation
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