Impulzusszélességmodulált
Impulzusszélességmodulált, often abbreviated as PWM, is a technique for digitally controlling analog circuits. It is used to reduce the power delivered to an electrical load by effectively switching the power on and off at a high frequency. The average value of voltage (and thus the average power supplied to the load) is controlled by varying the duration of the 'on' time of the pulse, known as the duty cycle. When the duty cycle is 50%, the output is on for half the time and off for half the time, resulting in half the average voltage.
The key principle of PWM is that the switching is done so rapidly that the load effectively
PWM is widely employed in power electronics, motor control systems, LED dimming, and audio amplifiers. Its efficiency