Ultrafast rectifiers

Infineon IR HiRel soft recovery ultrafast rectifiers are optimized to reduce losses and EMI/RFI in high frequency power conditioning systems. An extensive characterization of the recovery behavior for different values of current, temperature and di/dt simplifies the calculations of losses in the operating conditions.

If you want to learn more, please visit our website Hornby Electronic.

In most applications, the softness of the recovery eliminates the need for a snubber. These devices are ideal for power converters, motors drives and other applications where switching losses are significant portion of the total losses.

The ultrafast rectifiers are screened to MIL-PRF- equivalent.

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If you want to learn more, please visit our website China Ultra Fast Bridge Rectifier Supplier.

This is again from an HP power supply (PSU). The incoming 230 V is rectified into 340 VDC and is fed to a switched-mode supply. The odd thing here is that the manual for that unit, HPA, has different diodes for CR1, CR3, and CR2, CR4.

CR1 and CR3 are labeled "pwr rect 600V 3A 200ns" (MR856) whereas the other two are just "pwr rect 600V 3A" (1N). In reality the unit did have four identical MUR 460s which is indeed a 200 ns part. If we look at a more recent schematic for a similar PSU (HP) then they are labelled "- diode-power rectifier 600V 3A":

Now - is indeed MUR460 in real life. Is there a reason to use fast recovery diodes in a bridge for 50 or 60 Hz? Is it because it drives a switcher?

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