I want to create a PWM for my workbench, there are many ways to go about it, however I thought to task others expertise. First of all, the PWM is to be done with op-amps and/or a simple 555. I will list the parameters and you make the call on which setup to use.
I intend to make a PWM power supply for my workbench, and since ALL of my test equipment is precision, I want the PWM generator to be precision as well. Here is what i require:
The PWM must operate from 0Hz to maybe 100mhz (range may be limited by the selection of the semiconductors used).
The PWM must be variable from 0 to 100% duty cycle.
The PWM must have available 4 ranges of frequency which do not overlap more than a few Khz
The PWM Duty Cycle and Frequency controls must NOT interact with each other.
The Amplitude of the PWM output must be variable. (0~12v)
I will design the power supply section with a 24v source and will have both a +12v and -12v rails (fully regulated) for the op-amps. I may also choose to utilize 10-turn precision wire-wound pots for the frequency & duty cycle. I may also add an internal frequency counter and % Duty cycle meter, that can come later. I have thought of other methods as well using a simple function generator chip or microprocessor. In my opinion, both the op-amps and the 555 have been around forever and are also very forgiving to any overloads as well as being extremely versatile. As the "core" of the power supply, it will in the future be subject to many different stress factors. I have weighed the options and I choose the "simple" approach.
I will use the signal output from the "core" to drive various setups of a PWM Power stage using its own power source and drive transistor(s).
If you have any other questions, please contact me.
Thanks,
Don
I intend to make a PWM power supply for my workbench, and since ALL of my test equipment is precision, I want the PWM generator to be precision as well. Here is what i require:
The PWM must operate from 0Hz to maybe 100mhz (range may be limited by the selection of the semiconductors used).
The PWM must be variable from 0 to 100% duty cycle.
The PWM must have available 4 ranges of frequency which do not overlap more than a few Khz
The PWM Duty Cycle and Frequency controls must NOT interact with each other.
The Amplitude of the PWM output must be variable. (0~12v)
I will design the power supply section with a 24v source and will have both a +12v and -12v rails (fully regulated) for the op-amps. I may also choose to utilize 10-turn precision wire-wound pots for the frequency & duty cycle. I may also add an internal frequency counter and % Duty cycle meter, that can come later. I have thought of other methods as well using a simple function generator chip or microprocessor. In my opinion, both the op-amps and the 555 have been around forever and are also very forgiving to any overloads as well as being extremely versatile. As the "core" of the power supply, it will in the future be subject to many different stress factors. I have weighed the options and I choose the "simple" approach.
I will use the signal output from the "core" to drive various setups of a PWM Power stage using its own power source and drive transistor(s).
If you have any other questions, please contact me.
Thanks,
Don