What is PWM? What are its advantages?

What is PWM? What are its advantages?

 

 

 

 

What is PWM? PWM stands for Pulse Width Modulation, which is an effective technique that uses digital signals to control analog circuits. The basic principle is to simulate a continuous analog signal by varying the width of a series of fixed-frequency pulses and thus adjusting the duty cycle (the ratio of the high level time to the entire cycle time) of those pulses. In PWM, although the pulse itself is a rectangular wave, the effective voltage or power felt by the load connected to the PWM signal (e.g., motors, LEDs, etc.) can be simulated to a desired continuous change by adjusting the duty cycle. This technology enables the use of digital hardware (e.g., microcontrollers) to efficiently and accurately control analog circuits, especially where flexible adjustment of output levels is required, such as dimming, speed control, etc.

 

What are the advantages of PWM?

1. High efficiency: Since most of the time it is either completely on-on or completely cut-off, the power loss is reduced.

2. Low cost: Complex control functions can be realized with only a simple circuit.

3. High flexibility: the pulse width can be changed through software, which is easy to realize dynamic control.

4. Good stability: For load changes, the output can be maintained by adjusting the PWM signal.