power supply behavior question

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pianomania

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power supply behaviour

all we know power supply is a power " source " to provide current to the load.
can it " sink " current ?
since the internal should be a big capacitor
if it can't , why ?
does it have any extra circuit to prevent this ?
 

Why would someone want to sink current into a power supply? The idea is that the device requiring the power IS the current sink.

There are power supplies with reverse protection so if more voltage appears at the output than input, they are not damaged. There are also regulators that dump excess current to maintain stabilization called "shunt regulators".

Brian.
 


I just wanna to know the exact behavior of power supply inside.
for example , if your power supply has two channels , you can do experiement below,
first , setting two channel with different voltage
second, connect the two positive plug together , same as the negative plug.
third , series connect a current meter between two positve connector , and measure the current.

and then change the setting voltage!

finally , you can see the meter show positive curret or negative .

it means the power supply not only source current but also sink current!
 

Hi,

You should remember the KVL and KCL.

Workout and study your voltages and current direction.

Now you will become very clear.

Regards,
senthil
 

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