By V. R. Moorthi
"Power Electronics: units, Circuits, and commercial purposes presents an exhaustive insurance of assorted energy digital units, with emphasis at the thyristor. The features of recent strength semiconductor units comparable to the facility transistor, MOSFET, and IGBT also are mentioned. additionally coated intimately are managed rectifiers, ac and dc drives, cycloconverters, brushless dc cars, microprocessor Read more...
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Extra resources for Power electronics : devices, circuits and industrial applications
Example text
42. iA VRSM VRRM PFV VDRM VFBO vAK Fig. 2 Current Ratings All semiconductor devices need to be guarded against high temperature by limiting their currents, the maximum temperature for which a device is designed being normally higher than the IA2 Rd t heating, where IA is the rated forward current, Rd is the resistance of the device, and t is the conduction time. Though this provides some factor of safety to the device, the thyristor is a unique semiconductor device for which the temperature attained may exceed the designed maximum under certain special conditions.
The operation of the circuit is initiated by firing Th1 , thus passing current through the load. , the battery, R1 , C, and Th1 . When Th2 is triggered after a lapse of time, the capacitor voltage is impressed 40 Thyristor Physics across Th1 in a reverse fashion, thus turning it off. The capacitor C now charges in the reverse direction (with the X-plate positive) through the path consisting of the battery, Rld , C, and Th2 . In this process, the time taken by the Y -plate to attain zero voltage is the duration for which reverse voltage is applied across Th1 .
When the supply voltage vs is impressed across the circuit, the circuits R1 , SR, R2 on the one hand and R1 , C on the other come into operation. The voltage vc across C lags the supply voltage vs and that across the reactor SR (not shown) leads it. The value of R1 is made much greater than R2 so that even if the reactor were to be saturated the voltage across R2 is insufficient to trigger the thyristor Th. vc becomes positive at time t1 ; at t2 the reactor becomes saturated and its inductive reactance collapses to zero.
