Exam 13: Thyristors

The only way to close a four-layer diode is by

The IGBT is a

Commercial triacs have anode currents that extend as high as ________.

Analyzing and thinking in terms of functional blocks,or smaller jobs being done by different parts of the overall circuit is referred to as troubleshooting

A four layer pnpn device used to produce trigger pulses and sawtooth waveforms is

An important application for the SCR is

An important application of the SCR is to protect delicate and expensive loads against overvoltages from a power supply.

The SCR is far more useful than a four-layer diode because the gate triggering is easier than breakover triggering.

A silicon unilateral switch (SUS)is another name for the Schockley diode.

A transistor circuit that remains in either the closed or opened state indefinitely is referred to as a latch.

Which thyristor is the most widely used?

The angle at which the SCR is triggered on is called the

The silicon controlled rectifier is the most widely used thyristor.

With an SCR crowbar circuit,a fuse or current limiting is needed to prevent damage to the power supply.

The triac can control current

With an SCR crowbar,what else is needed to prevent damage to the power supply?

A gate voltage can turn an SCR on and off.

One way to overcome soft turn-on caused by the curved zener breakdown knee is to add voltage gain.

One method used to reduce the effects of SCR switching transients is by using

A low-power thyristor that can be triggered on or off is