Hi Guys,
I have a number of basic power supply units that use a mains tx with a centre tapped secondry with a 35A, 600V bridge rectifier … and these supply equip with a listed load of a max of 8A 24 V. (being centre tapped they only use half of the bridge)
Clearly you would expect these bridge rectifiers to last forever because they are vastly over rated for their load … but they don’t. Lots of them fail .. go short circuit.
I suspect that they are killed by electrical switching noise around the facility, so am planning on fitting some varistors across the input to the rectifier … but I am also wondering if I can use some high speed dual, common cathode diodes in their place.
Eg. FFAF60UA60DN Ultra Fast Rectifiers.
These are rated at 60A 600V, and are designed for use as clamping and freewheeling diodes in switching power supplies etc. … but my question is … is it ok to use them as basic 60Hz rectifiers in place of the original bridges.
Thanks for any help.
Regards, Wes
I have a number of basic power supply units that use a mains tx with a centre tapped secondry with a 35A, 600V bridge rectifier … and these supply equip with a listed load of a max of 8A 24 V. (being centre tapped they only use half of the bridge)
Clearly you would expect these bridge rectifiers to last forever because they are vastly over rated for their load … but they don’t. Lots of them fail .. go short circuit.
I suspect that they are killed by electrical switching noise around the facility, so am planning on fitting some varistors across the input to the rectifier … but I am also wondering if I can use some high speed dual, common cathode diodes in their place.
Eg. FFAF60UA60DN Ultra Fast Rectifiers.
These are rated at 60A 600V, and are designed for use as clamping and freewheeling diodes in switching power supplies etc. … but my question is … is it ok to use them as basic 60Hz rectifiers in place of the original bridges.
Thanks for any help.
Regards, Wes
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