DC Value of Square Wave

Thread Starter

crazyengineer

Joined Dec 29, 2010
156
Okay, so this is one concept I keep trying to understand after my Signals and Systems class. Is there a generalized formula for finding the DC value of a square wave. Here's a very poor picture example.



Also, let say I conceptually connect a DC motor to a voltage source that's emitting the square wave in the above picture. Do that mean the motor will see this DC value?
 

Thread Starter

crazyengineer

Joined Dec 29, 2010
156
The average value is the area under the curve for a full cycle divided by the time period of the cycle

average = ( (5V x 1ms) + (0V x 1ms) ) / 2ms = 2.5V
I see. One more question: if I connected a motor to the square wave in the above picture, then will it see this average value?
 

MrChips

Joined Oct 2, 2009
21,288
A lot depends on the motor, the size, weight, inertia, load, power requirements, frequency of the pulses.

Yes, chances are the motor will see the average value. This is what is know as PWM drive (Pulse Width Modulation).
 
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