Hi
I am a electronics student struggling to understand how a MIT420 is able to produce an output of >1000V from a 7.5V DC supply.

There is some good information explaining how the hand cranked meggers work using a dynamo and coils, but I can't find a good explanation for an electronic megger.

I have looked into DC-DC boost convertor and transistor operated amplifiers, but it is not immediate obvious which it uses if any.

Any ideas?

 

It has an oscillator inside similar to a camera flash, which charges a capacitor up with DC to approx 500V, however it's low current..

 

Typically this kind of converter uses a blocking oscillator / flyback type circuit. A transformer (or autotransformer) steps tup the low voltage primary side waveform (squarewave of something similar) to a much higher voltage (and lower current) across the secondary. This is then rectified or not,depending on the application.

For example, camera flash tube circuits, that start out at a low frequency and then go higher and higher in pitch as the flash capacitor charges up, usually use a blocking oscillator. It is a very simple circuit with very few parts and almost no brains.

ak