By M. Ramamoorty
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Extra info for An Introduction to Thyristors and Their Applications
For controlling the firing angle and maintaining constant load voltagejcurrent. 9 INTERNAL POWER DISSIPATION AND TEMPERATURE RISE The J2R loss due to the forward current is the major component of the THYRISTORS 29 total power dissipation in the SCR. , the losses during the transition period when the device goes from on-state to off-state, and vice versa) at higher operating frequencies will be greater than those at lower frequencies. However, for the present we may ignore these switching losses and the gate power dissipation.
255. Gutzwiller, F. , 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.
Sec. 6 shows the structure of the shorted emitter which is used for SCRs with a capability of withstanding high values of dvfdt. Here, a part of the thermally-generated r1 I I I Cj: ::=: I I t---------------IJ2 N r------------------IJ1 p l_ Fig. 6 Shorted emitter structure. leakage current and the charging current across the reverse-biased junction h are diverted around the gate-to-cathode junction by providing an alternative low-impedance path to the cathode as shown in the figure. Because of the side-gate structure and the highly-resistive P layer, the turn-on time of such an SCR is high.