Pulse Width Modulation (PWM) is the abbreviation of "Pulse Width Modulation" in English, referred to as pulse width modulation. It is a very effective technology that uses the digital output of a microprocessor to control analog circuits, and is widely used in many fields such as measurement, communication, power control and conversion.

Pulse width modulation (PWM) is a method of digitally encoding analog signal levels. Through the use of high-resolution counters, the duty cycle of the square wave is modulated to encode the level of a specific analog signal. The PWM signal is still digital, because at any given moment, the full-scale DC power supply is either completely (ON) or completely absent (OFF). The voltage or current source is applied to the analog load in a repetitive pulse sequence of on (ON) or off (OFF). When it is on, it is when the DC power supply is added to the load, and when it is off, it is when the power supply is disconnected. As long as the bandwidth is sufficient, any analog value can be encoded using PWM.

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