How do power supplies switch to constant voltage and constant current?

Question

I’m talking about like bench power supplies. Like how do they know if the positive and negative is shorted and it switches to constant current?

In: 3

Answer 1

they don’t really switch between the two, it is always doing constant voltage but there is circuitry that measures the current and can turn down the voltage

so when the current is over the set limit the voltage is turned down until the current is back at the limit, when the current get under the limit the voltage get turning back up but only up to the voltage you set