14-10-2019, 03:52 PM
Selenium rectifiers are still made: https://cougarelectronics.com/power-conv...uppressor/
Similar looking rectifiers use a metal oxide. Both types are often known as "metal rectifiers".
https://en.wikipedia.org/wiki/Metal_rectifier
That wiki articles says there are still a few uses, such as electroplating, where metal rectifiers are still preferred, as they can be designed for lower voltage drop. I find this a little hard to believe though silicon has a drop of at least 700mV and schottky rectifiers at least 200mV. If you want really low voltage drop in modern applications such as low voltage switchmode PSU, then synchronous rectifiers using FETs are the answer.
Similar looking rectifiers use a metal oxide. Both types are often known as "metal rectifiers".
https://en.wikipedia.org/wiki/Metal_rectifier
That wiki articles says there are still a few uses, such as electroplating, where metal rectifiers are still preferred, as they can be designed for lower voltage drop. I find this a little hard to believe though silicon has a drop of at least 700mV and schottky rectifiers at least 200mV. If you want really low voltage drop in modern applications such as low voltage switchmode PSU, then synchronous rectifiers using FETs are the answer.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
