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What are the advantages of using diode rectifier over transistor rectifier?

Kaitlin Dean

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Victoria Fowler on November 6, 2018

A1: You have these "transistor rectifier" in you? Supplied by that? You are ill-informed. The transistors can rectify A. C. Stick with the existing technology. Diodes do a good job has nothing to do with gain like in transistor circuits. A2: Transistors can be used for rectification, and there may indeed be transistors specifically designed for this task. In a diode rectifier, you will always have a voltage drop of ~1 - 1.4 volts (.5 - .7 volts per diode). By being creative with transistor arrangements, you can end up with this voltage drop / loss of power almost completely. There are some fairly simple write ups online related search for "transistor rectifier"; this list of some of the drawbacks. The disadvantages all come down to this: you need to carefully design for your application, and if not, the circuit doesn't work (or it may not work for long). Rectifier diodes are more forgiving on over voltaging of a transistor will be; depending on the transistors used, you may not have much directionality control, so that large power capacitors to minimize the ripple may not be usable; the matching of the transistors is a bit more complicated than that of the diodes (the gains may be different, causing some to work better together than others); the Thermal runaway could result, common heat sync is probably a good idea; etc, etc Transistor rectifiers are simply more complicated, but in some situations, the complication is worth the investment. In general, it is best simply to complicate, though.


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