Microchip (PWM) - difference between duty cycle and frequency

Therefore, adjusting the duty cycle does not affect the frequency, but adjusting the frequency does affect the duty cycle.In summary, the conversation is about the concept of PWM and how it is used to vary the speed of motors. There are different registers that allow for adjusting the frequency and duty cycle of the PWM peripheral. The confusion arises from thinking that the duty cycle and frequency are the same, when in fact they are two separate parameters that affect each other. Adjusting the duty cycle does not change the frequency, but adjusting the frequency does affect the duty cycle.
  • #1
LM741
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Hey guys.

Just trying to program a microchip.

Trying to grasp the concept of PWM.

I know that varying the duty cycle will vary the speed of my motors...but there are other registers that allow you to set the frequency of the PWM peripheral...NOw I'm getting confused...isn't the duty cycle the frequency because essentially you're adjusting the time that the wave is on or off...?? hence your adjusting the frequency...?

Thanks
 
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  • #2
PWM can be done at either a fixed frequency (where you vary the on time and off time both to maintain the same total time for each cycle), or with variable frequency (like with a fixed off time and variable on time).
 
  • #3
Duty cycle is the pulse duration divided by the pulse period. Frequency equals the reciprocal of the period.
 

Related to Microchip (PWM) - difference between duty cycle and frequency

What is a microchip?

A microchip is a small electronic device that contains integrated circuits and is designed to perform a specific function, such as processing data or controlling other devices.

What is PWM?

PWM stands for Pulse Width Modulation, and it is a method for controlling the amount of power supplied to a device by varying the width of the electrical pulses.

What is the difference between duty cycle and frequency?

Duty cycle refers to the percentage of time that a signal is on compared to the total time of a cycle. Frequency, on the other hand, refers to the number of times a signal repeats in a given time period. In PWM, duty cycle and frequency are inversely related - a higher duty cycle means a lower frequency and vice versa.

How is PWM used in microchips?

PWM is commonly used in microchips to control the speed of motors, dim the brightness of LEDs, and regulate power to various electronic devices. It is also used in communication protocols, such as infrared and radio frequency.

What are the benefits of using PWM?

PWM provides a more efficient way of controlling power compared to traditional methods, such as linear voltage regulation. It also allows for precise control of devices, reduces power consumption, and minimizes heat dissipation.

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