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Home > Archive > Electrical Engineering > January 2007 > Rectifier Getting Too Hot
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Rectifier Getting Too Hot
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| 66chevypickup@cox.net 2007-01-17, 5:25 pm |
| Hello Friends,
I have a simple question for you. Im using a 12volt rectifier to
convert A/C power from my 100watt AC transformer, to 12volt DC. The
problem Im having is, the rectifier im using is rated to about 12 amps,
but while only drawing around 5-6 amps, it starts getting REALLY hot.
It requires a heatsink and fan, and even then it stays very hot. Are
there any More efficient Rectifiers, that can handel 8 amps or so,
without Heating up very much? or atleast only requiring a heatsink and
not a fan?
Thanks a lot for your time
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| Bill Kaszeta / Photovoltaic Resources 2007-01-17, 9:25 pm |
| On 17 Jan 2007 14:47:29 -0800, 66chevypickup@cox.net wrote:
>Hello Friends,
>
>I have a simple question for you. Im using a 12volt rectifier to
>convert A/C power from my 100watt AC transformer, to 12volt DC. The
>problem Im having is, the rectifier im using is rated to about 12 amps,
>but while only drawing around 5-6 amps, it starts getting REALLY hot.
>
>It requires a heatsink and fan, and even then it stays very hot. Are
>there any More efficient Rectifiers, that can handel 8 amps or so,
>without Heating up very much? or atleast only requiring a heatsink and
>not a fan?
>
>Thanks a lot for your time
>
MBR3045WT SCHOTTKY RECT 45V 30A TO-247AC
about $0.76 at Digikey
Schottky rectifiers have a lower forward voltage (about 0.35v) drop
than regular rectifiers (about 0.0 - 1.0v). The heating is caused by
the product of voltage draop and current. One-half the voltage
drop is one-half the heating.
Bill Kaszeta
Photovoltaic Resources Int'l
Tempe Arizona USA
bill@pvri-removethis.biz
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