Low Power DC/DC converter

[tpsengineer]

I am looking to design a precision 100V output DC/DC converter. The input voltage will be less than 36V and the output current needs to be limited to 75mA. Space is an issue and I would like to avoid using a transformer. Suggestions would be greatly appreciated.

 

[MMAshwin]

Hi,

One method is yo use a voltage tripler then regulate the voltage to 100V.

As your starting of with DC you would need to chop it up and feed it through a capacitor to make it symetrical 36VAC.
A simple 555 switching a series transistor should do it. As for the regulator at the end of the multiplier you could use a series regulator with a 100V (+.6) zener on the base of the series transistor.

See the following for examples on multipliers

http://www.tpub.com/neets/book7/27m.htm

The use transformers in the initial stage but as I said if your uusing DC convert it to AC by the method above.

Another method (which still requires AC on the input) is a Cascade Voltage Multplier. See the following link for info

http://63.229.238.60/kv2/kv2/hv/multplier/

Good luck
Any help ?, yes no let me know.

Regards

 

[xray]

HELLO;
I am going to through this out there. A high voltage can be developed across an inductor with little input voltage. I have seen 120volts developed across an inductor with as little as a 5 volt supply. V=(Ldi)/dt the circuit utilized a bjt to switch the current off of the inductor creating a spike in the voltage. The current a small vaule being switched off in an even smaller time yields big values. if this was done in a cyclical fasion would one be able to regulate the voltage spikes. I am only musing outloud. hope I have wasted anybodies time.

Sincerely;

XRAY

 

[jbartos]

Suggestion: Visit

http://www.thomasregister.com

and type dc-dc converters, which will return 7 companies to contact for more info about the product since the engineering and design of DC-DC converters can become very involved, if the non-linear phenomena are considered, e.g. chaos, bifurcation, frequency doubling, nonlinear oscillations, etc.