Why did I design this?

Some people feel that they need a faster rectifier bridge than the normal 1-50 µs in 50/60 Hz applications. I have seen on the internet that there are few products out there which can take max 2-3 A because the don't have any cooling arrangements.

My design can take a lot more current because I have four heatsinks, one for each diode but you can also attach all four diodes to a plane heatsink. If the heatsink is large enough this rectifier bridge can handle as much current as the max rating of the diodes. The chosen MUR3020PT orMUR3020WT can handle 30 A continuously. The new revision of pcb can now also handle TO220 diodes. MUR820 (200V, 25 ns) and MUR860 (600V, 45 ns IR, 25 ns ON-Semi) seem to be good choices. I have chosen MUR820 because ELFA has it.

Two manufactures of diodes can be found here:



The heatsinks can be chosen after demand of cooling and they have a standard profile which can be obtained from Aavid, Fischer, Redpoint and Austerlitz. The heatsinks at the picture are 25 mm (1") high but you can get these in 38 mm (1.5") or 50 mm (2"). If you want to use the diodes at it's maximum you must use an even bigger heatsink. Just bend the diode pins in 90 degrees angle and attach the diodes to a heatsink with a plane surface. Since the diodes are have fully symmetrical pinout you can mount them on the solderside or the component side.