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How PWM and Duty Cycle Works...
PWM is used throughout the automotive industry as a command signal. It is meant to make automotive
components work less, when the demands are not as heavy. And, we created the PWM Bi Directional
controller to help you test and diagnose all solenoids, motors and actuator components.
PWM, or pulse width modulation, is the ability to control a load or component, by pulsing
its electrical current. In this way, the load or component can be made to change its speed,
without any heat causing parts, like resistors. So, if PWM is using pulses to control a load,
then Duty Cycle is the measurement of these pulses.
The Duty Cycle of a PWM signal, tells us the amount of work this signal is supposed to
make the component perform. The duty cycle of the signal is always described in percentage.
So, a 10% duty cycle means, that the component is on 10% of the time. And a 90% duty cycle
means the component is on 90% or most of the time.
Now, there is a close relationship between duty cycle, and how the component is triggered
or turned on, which could be by applying power or ground. This relationship is very important,
so remember that thoroughly. Here is what we mean by that. Suppose a solenoid is activated
by ground. That means, that 12 volts or battery voltage is applied steadily on one side, mostly
through a relay, and the other side receives a PWM ground command signal. Now imagine that
a 10% duty cycle PWM signal is applied. What we then have is to measure is how long the
signal is grounded. And, how long as compared to the entire cycle. A 10% PWM duty cycle
means that the solenoid receives a ground only 10% of the time, and receives power 90%
of the time. Since we have already mentioned that this is a ground controlled solenoid,
the time the drive transistor provides power means that component is off. Why? because
you already have steady power on one side, so power on the other side equals no operation.
If, on the other hand, the component is turned on by power, meaning ground is steadily applied
on one wire, and power is pulsed, that same mentioned signal, will then become a 90% duty
cycle signal. Now with this power actuated component, the positive or 12 volt side is
what matters, and what is taken as the duty cycle. It is worth mentioning that most components
are triggered or actuated by ground. Why? It is because if that command signal is shorted
to chassis ground, the component will simply turn on all the time, like a 100% cycle. If
it were power triggered, then there would be a short, and the fuse would blow rendering
the system useless. But still, some components are power triggered, and be prepared to understand
the nature of PWM to Duty Cycle. Hopefully what you have learned here will give you some
insight on using the PWM Bi Directional Controller to perform your diagnostics.
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How PWM and Duty Cycle Works

760 Folder Collection
kiss08099 published on January 24, 2016
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