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Old 18th October 2003, 09:52 AM   #1
MaXiZ is offline MaXiZ  Italy
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Default good rectifier

I don't know if that the right place but i'll try!
What's the best rectifier to use on heave current SMPS?
Sorry i mean this symbol that i don't know the name..
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Old 18th October 2003, 10:25 AM   #2
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this is the symbol for a mosfet
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Old 18th October 2003, 10:54 AM   #3
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Default Re: good rectifier

Quote:
Originally posted by MaXiZ
I don't know if that the right place but i'll try!
What's the best rectifier to use on heave current SMPS?
Sorry i mean this symbol that i don't know the name..
Click the image to open in full size.
Choice of diode strongly depends of the switching frequency but in general you must have faster diodes than normal recifier diodes (50/60 Hz applications), shottky or fast recovery diodes

The mosfet symbol is a special type of mosfet which has a zener like body diode.
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Old 18th October 2003, 11:05 AM   #4
MaXiZ is offline MaXiZ  Italy
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Quote:
depends of the switching frequency
I work around 50kHz and with a car battery with +12V@50A
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Old 18th October 2003, 11:11 AM   #5
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Quote:
Originally posted by MaXiZ

I work around 50kHz and with a car battery with +12V@50A
Do you have any schematics? Where are the diodes placed?
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Old 18th October 2003, 11:31 AM   #6
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Sure...
Click the image to open in full size.
And the mosfet are the IRFZ44N
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Old 18th October 2003, 01:33 PM   #7
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Default no diode

Sorry but I cant see any diodes except the Ultrafast Bridge.
The mentioned iodes are integrated into the MosFets!
You dont need extra diodes in these places!

Uli
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Old 18th October 2003, 01:40 PM   #8
MaXiZ is offline MaXiZ  Italy
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Exactly i meana good power mosfet for 50A
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Old 18th October 2003, 01:51 PM   #9
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You don't need 4 50A mosfets. Why can't you use the ones which are suggested?

How many amperes are you planning to take out? I'll see a 6.3 A fuse in the schematic.

BTW: Isn't this thread in the wrong forum. Car audio would be better. Maybe a moderator will move it?
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Old 18th October 2003, 02:17 PM   #10
MaXiZ is offline MaXiZ  Italy
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That a modified version.. the original schematic suggest the MTP75N that are 75A and the IRFZ44N are 49A!
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