Power transistors are devices that
have controlled turn-on and turn-off characteristics. These devices are used a
switching devices and are operated in the saturation region resulting in low
on-state voltage drop. They are turned on when a current signal is given to
base or control terminal. The transistor remains on so long as the control
signal is present. The switching speed of modern transistors is much higher
than that of Thyristors and are used extensively in dc-dc and dc-ac converters.
However their voltage and current ratings are lower than those of thyristors
and are therefore used in low to medium power applications.
Power transistors are classified as
follows:
- Bipolar junction transistors(BJTs)
- Metal-oxide semiconductor
filed-effect transistors(MOSFETs)
- Static Induction transistors(SITs)
- Insulated-gate bipolar
transistors(IGBTs)
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