Reply to "Rectifier Sizing"

stan2004OGR Forum Member

@gunrunnerjohn posted:
..
If you actually have 10 amps flowing through the bridge, it'll be dissipating around 7 watts, that size of a part package will be hotter than a firecracker.

At any given time, two (2) diodes of a 4-diode bridge rectifier are "ON." Hotter than a firecracker to say the least! wavey I think you can buy a 10 Watt soldering iron - as in hot enough to melt solder.

@Rich Melvin posted:
...
At only 3 amps (30% of its max current rating) it will be quite cool.

3 Amps running thru 2 diodes (~0.7 Volts each) is just over 4 Watts. One would have to be pretty thick-skinned to characterize 4 Watts "quite cool." I've burnt my finger touching a component dissipating a measly 1 Watt.

5/3/218:00 PM

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