Power Supply Unit With Diode

The Drok power supply unit (PSU) does not come with reverse current protection.

If a battery is connected to the output, and the battery has more voltage than the PSU is set to deliver, then the PSU will 'run backwards' likely causing damage to the PSU.

Adding a diode will protect the PSU from backfeed damage.

PSU: https://www.amazon.com/dp/B08LPVWX74

Diode: https://www.amazon.com/dp/B08KDGBFTV

This 20A diode exceeds the capabilities of the 12A PSU.

However, the diode is rated to 50v and the PSU up to 60V. So after this modification, do not run the PSU output over 50V.

Test the PSU.

Makes sure it works as desired before any modifications.

Remove the 3 bolts holding each of the components to the heatsink.

Remove the 4 bolts holding the heatsink to the circuit board.

Set aside the thermal pads; originally mounted between the components and the heatsink.

(keep these protected and clean to retain their effectiveness)

With a sharp knife cut the tracing to the positive (+) output pin, and peel away the section from the circuit board.

(see photo)

Clean the leads on the diode and bend as shown.

observe the bar painted on the diode to get the correct polarity.

solder the diode to bridge the gap created in the tracing.

Ensure correct polarity of the diode; the striped end of the diode connects to the +output pin.

Test the PSU.

Ensure the PSU operates as before.

Reassemble the heatsink.

Patience and caution. Tweezers are helpful aligning the thermal pads and inserting the bolts to mount the components to the heatsink.

Test again.

When complete, the PSU is ready for use.