What is Pulse-width modulation (PWM)?
A method that adjusts average voltage or power by varying the high time of an output while keeping the period constant. Used to dim LEDs and control motor speed.
Field: Embedded Systems & Firmware
Pulse-width modulation (PWM) in the explanations
Averaging a PWM signal with a low-pass filter gives an output of amplitude × duty cycle—about 2 V for 40% of 5 V.
When a microcontroller produces an analog voltage by passin…PWM (pulse-width modulation) adjusts average voltage or power by changing the high time while keeping the period constant.
A PWM signal has a period of 1000 counts, with the output h…This linearity is used to generate sawtooth waves, in integrating ADCs, and to create the triangle wave for pulse-width modulation.
When a constant current keeps flowing into a capacitor, how…
Questions that mention Pulse-width modulation (PWM) (6)
- When a microcontroller produces an analog voltage by passing a PWM signal through a low-pass filter, what determines the output voltage?
- A PWM signal has a period of 1000 counts, with the output high (1) for 250 counts of each period. What is the duty cycle?
- When a constant current keeps flowing into a capacitor, how does its voltage change?
- What is the main role of an inverter in power electronics?
- How many switching devices does a typical three-phase inverter for driving a three-phase motor use?
- Which method is commonly used by microcontrollers to adjust LED brightness or motor speed?
Related terms
Microcontroller Duty cycle Baud rate Bootloader Brown-out detection Contact bounce Debouncing GPIO Hard real-time I2C