What is the breakdown voltage of the silicon controlled rectifier?

Answer 1

The progression from Shockley diode to SCR is achieved with one small addition, actually nothing more than a third wire connection to the existing PNPN structure. If an SCR's gate is left floating (disconnected), it behaves exactly as a Shockley diode. It may be latched by breakover voltage or by exceeding the critical rate of voltage rise between anode and cathode, just as with the Shockley diode. Dropout is accomplished by reducing current until one or both internal transistors fall into cutoff mode, also like the Shockley diode. However, because the gate terminal connects directly to the base of the lower transistor, it may be used as an alternative means to latch the SCR. By applying a small voltage between gate and cathode, the lower transistor will be forced on by the resulting base current, which will cause the upper transistor to conduct, which then supplies the lower transistor's base with current so that it no longer needs to be activated by a gate voltage. The necessary gate current to initiate latch-up, of course, will be much lower than the current through the SCR from cathode to anode, so the SCR does achieve a measure of amplification. :) sorry its kinda hard to explain. I hope I helped

Answer 2

Because it is a rectifier.

However, it differs from other rectifiers in that it doesn't conduct until current is passed through the gate-cathode junction.

The conduction is therefore controlled.

The advantage over a normal rectifier diode is that the s.c.r. can be made to conduct at any point on a positive excursion of an applied a.c.

Once it conducts it will continue to do so until the applied voltage is almost at zero, at which point it turns off again.

Answer

The term 'rectifier' dates back to the so-called 'War of the Currents', between Thomas Edison, an advocate for d.c. electrical systems, and George Westinghouse, an advocated for a.c. electrical systems. In an attempt to convince people that d.c. was the better system, Edison made a lot of use of language to promote his beliefs; one was to suggest that changing a.c. into d.c. was to 'rectify' it -that is, to change it into the better (d.c.) system! That term has stuck, and we have used it to describe the process of changing a.c. into d.c. ever since.

Another term Edison used to denigrate a.c. systems, which had by then been chosen to power electric chairs, was to describe death by electrocution as being 'Westinghoused'!

Answer 3

Silicon-controlled rectifiers are used in switching circuits, for phase control, for clipper circuits, inverting circuits, and relay-control circuits

Answer 4

The most common use of SCRs is in a bridge network for variable frequency motor drives.

Answer 5

how am i ment to know sorry

Answer 6

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