What's a iosolated DC DC converter and non-isolated DC DC converter ?

[Lucy Huang]

Hey, What's a iosolated DC DC converter and non-isolated DC DC converter ?

Who can find the compeletely answer?

thanks

[HEC]

The main difference between isolated and non-isolated (apart of the inner differences in the circuitry / module itself) is that on non isolated converters one of the potentials (usually the ground) is connected / common while on isolated ones the input and output are completely separated (hence isolated). Depends on the application you might need / prefer one or another.

[lizardmech]

Isolated lacks a physical connection, it's transferred via a magnetic field in a transformer. It has a few advantages, if you try to draw too much current the transformer magnetic field collapses and nothing breaks. If there's any sort of surge or failure the damage will usually stop at the transformer, non isolated ones will kill everything they are connected to. You can also use them for floating voltages, take mosfet drivers in a motor controller as an example, they must be supplied with 15v higher than the voltage at the motor, if your motor is running on 100v where do you get the 115v from? All you need to do is take a 15v isolated dc-dc converter and ground it to the motor phase, the isolated converter will now output what ever voltage the motor phase is + 15v.

The downside is they can't carry much current for their size and cost more.