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| Bridge diode thermal problem |
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| Zero999:
--- Quote from: Md Mubdiul Hasan on October 08, 2019, 10:55:00 pm --- --- Quote ---You should only be worried if you plan to use the device in an environment 35oC hotter, than where you tested it and measured these temperatures. --- End quote --- Yes. I did see in Saudi or middle east area, all componets were varified for higher temparature rate! --- Quote ---The bridge rectifier can stand much higher temperatures before being damaged and the forward voltage has a negative temperature coefficient, so power dissipation, thus heating will decrease, with increasing temperature. --- End quote --- Any mathematical equation exists relating those factor? --- End quote --- Yes, the temperate coefficient of an ordinary silicon diode is −2 mV/˚C. A very high currents though, it's not quite so clear cut, as there is a parasitic resistance, but it's normally negligible within the ratings. Another way to reduce the power dissipation is to use Schottky diodes for the bridge, which typically drop half the voltage. |
| Md Mubdiul Hasan:
--- Quote from: RES on October 09, 2019, 09:10:39 am ---You can use an ideal diode bridge controller LT4320, or create a MOSFET bridge yourself (see diagram below) Instead of diodes MOSFETs are used. https://www.analog.com/en/products/lt4320.html --- End quote --- Excellent ! Could you compare part list between yours with mine! Does not it little bit expensive? Reliable for sure. |
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