Because many of you have wanted to know more about dc to dc power supplys I have looked up some things that helped me learn more about them.
Most engineers use black box devices to put a system together rather than build from scratch. We will not build from scratch but will open the case on the blackbox.
Building an a PWM source can be troublesome so I use the arduino project to feed the buck circuit to avoid many problems. Fact is the play area of the arduino website has published a project for a buck supply with a circuit we will use.
Other tools we will use include TopSpice just download the free version.
Next we will use the text file found in the tutorial on the ecircuit website files named basic buck. Much more can be gleened there but that can get you started.
Using a p channel fet driven by a npn small signal transistor with the PWM signal, and following the project published on the arduino site, you can have any size dc to dc supply you care to build.
Use the ecircuit site to learn why it works. See the results in action using the spice file supplied in the file from ecircuit in the downloaded TopSpice program.
You will find much on voltage dividers and a voltage divider calculator online. Build a divider and test it before you connect it to the arduino board. This input is feed to an analog pin on the board. It is used to read the output of the circuit so the program can adjust the output via the PWM duty cycle.
The output voltage can be 1/4 of the supply voltage. This means that a 48 volt supply can provide 12volts.
Have fun,
Kevin
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