By M. Ramamoorty
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Additional resources for An Introduction to Thyristors and Their Applications
Sylvan, T. , Power semiconductors under transient and intermittent loads, AlEE Trans. (Communications and Electronics), 1960, p. 699. , The ratings ofSCRs when switching into high currents, IEEE Trans. (Communications and Electronics), 1963, p. 575. Newsam, B. al resistance: Its measurement and use in the rating of thyristor, lEE Conference Publication, No. 53, 1969, p. 85. Reed, J. , Dyer, R. , Power thyristor rating practices, Proc. IEEE, 1961, p. 1288. Rice, J. , Nickels, L. , Commutation dv/dt effects in thyristor 3-phase bridge converters, IEEE Trans.
When the device is turned on, the gate acts as a voltage source and charges the capacitor. This charge can provide enough gate current after the anode current ~as stopped, and thereby increase the turn-off time of the SCR. If an inductor is connected across the gate and the cathode, the negative gate current will be maintained by the inductance even after the anode current has stopped, and this will facilitate faster turn-off. However, when pulse-firing is used for gating the device, the negative gate current, which continues to flow out of the gate, can possibly turn off the SCR.
The details of protection schemes will be discussed in Chapter 11. 1 Example An SCR has a continuous average current rating IT av of 2SA and a dynamic resistance RT of 1 o. If the casing temperature is decreased from 32 AN INTRODUCTION TO THYRISTORS AND THEIR APPLICATIONS 40°C to 30°C by efficient cooJing, calculate the per cent increase in the device rating. State the necessary approximations. It is assumed that the total internal power dissipation Pd is due to the forward conduction Joss and that the maximum permissible junction temperature is 125°C.
An Introduction to Thyristors and Their Applications by M. Ramamoorty