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Which of the following is not a PWM technique?
Single-pulse width modulation
Single-pulse width modulation
Triangular-pulse width modulation
Sinusoidal-pulse width modulation
Triangular-pulse width modulation
Triangular-pulse width modulation is not a standard PWM technique used in power electronics or control systems. PWM techniques are fundamentally defined by how the pulse width is adjusted based on comparison signals, typically involving carrier waves (like triangular waves) and reference waves (like sinusoidal or DC levels).
Triangular-pulse width modulation is not a standard PWM technique used in power electronics or control systems. PWM techniques are fundamentally defined by how the pulse width is adjusted based on comparison signals, typically involving carrier waves (like triangular waves) and reference waves (like sinusoidal or DC levels).
d=TTonтАЛтАЛ тАФ Definition of Duty Cycle (d)
VavgтАЛ=dтЛЕVsтАЛ тАФ Average Output Voltage for a Chopper
PWM involves comparing a high-frequency carrier signal with a lower-frequency reference modulating signal. The intersection points determine the switching instants of the power semiconductor devices. Techniques like SPWM use a triangular carrier and a sinusoidal reference, whereas Single-pulse PWM uses a simple rectangular pulse variation within each half-cycle.
SPWM (Sinusoidal PWM) is widely used in VSI (Voltage Source Inverters).
Single-pulse PWM is used for basic control of choppers or inverters where only one pulse per half cycle is sufficient.
Triangular waves are typically used as 'carriers' in PWM, but 'Triangular-pulse width modulation' is not a recognized nomenclature for a modulation technique.
The primary goal of PWM is to minimize harmonics and control the effective output voltage.
Improved power quality (lower THD)
Precise control over voltage/current output
Increased switching losses at high frequencies
EMI (Electromagnetic Interference) generation
Variable Frequency Drives (VFDs)
DC-DC Converters (Choppers)
UPS Systems
Common PWM types include Single-pulse, Multi-pulse, Sinusoidal, and Space Vector PWM.
Option C is invalid because 'Triangular' describes the carrier waveform, not the modulation scheme itself.
C is correct тАФ Triangular-pulse width modulation is not a recognized standard PWM modulation classification.
Always distinguish between the 'Carrier Waveform' (e.g., triangular) and the 'Modulation Technique' (e.g., SPWM). A triangular signal is the tool, not the technique.