Question
Download Solution PDFWhich modulation technique is commonly used in power modulators to achieve variable power output?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFPulse-width modulation
PWM in power modulators involves varying the width of the pulses in a square wave signal to control the effective power delivered to a load.
By adjusting the duty cycle of the PWM signal, the average voltage and current supplied to the load can be controlled, allowing for precise regulation of power.
In power electronics, PWM signals can be classified into different types based on the waveform and control method:
- Unipolar PWM: The signal swings between zero and a positive voltage level (or zero and a negative voltage level), with a single polarity.
- Bipolar PWM: The signal swings between positive and negative voltage levels, providing a symmetric waveform around zero.
Additional Information
Frequency modulation
- In frequency modulation, the frequency of the carrier signal is varied in proportion to the amplitude of the modulating signal. The carrier signal has a constant amplitude and phase but a varying frequency.
- FM is widely used in radio broadcasting, television audio, and two-way radio communication.
Amplitude modulation
- In amplitude modulation, the amplitude of a high-frequency carrier signal is varied in proportion to the amplitude of the low-frequency modulating signal. The frequency and phase of the carrier remain constant.
- AM is commonly used in radio broadcasting, television, and various communication systems.
Delta modulation
- Delta modulation involves encoding the change or difference between consecutive samples of the analog signal. Instead of transmitting the exact value of each sample, delta modulation transmits whether the signal has increased or decreased relative to the previous sample.
- This simplifies the encoding process and reduces the amount of data that needs to be transmitted.
Last updated on May 29, 2025
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