How do i isolate a dc supply , like isolation transformer used in ac circuits?

i need to know that there is torroidal transformer is used as isolation transformer for ac circuits. like that is there any method to isolate a dc supply ?How do i isolate a dc supply , like isolation transformer used in ac circuits?
without knowing your project it is difficult to answer


Only a DC/DC converter will do that


How much isolation do you need, how much power voltage/current


frequency....








DHow do i isolate a dc supply , like isolation transformer used in ac circuits?
If your current requirement is not too high, DC-DC isolated power supplies are available and reasonably priced.





If you require additional current, you can use multiple power supplies in parallel in many cases.





Toroidal transformers are used in DC-DC supplies, yes, BUT they are being switched rapidly, as is required for a transformer, to create the output voltage.
Yes. Convert your DC to AC with a power oscillator, pass that through a transformer and rectify it back to DC. Use a high frequency (a few tens of kHz) so you can get away with less steel in the core.





Add a tertiary winding if you want to take feedback. The turns/volt will be the same on the tertiary as the secondary, so you can work out what's coming out of the secondary by measuring what's coming out of the tertiary.
The normal way of blocking a DC Component in a circuit is to use a capacitor. The capacitor will pass any AC component in the signal but block DC. It will not isolate the DC from the supply in the same way that a double wound transformer does with AC