An Introduction to Thyristors and Their Applications by M. Ramamoorty

By M. Ramamoorty

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It is often used as a relaxation oscillator to obtain shaTp pulses with a good rise time in triggering circuits for SCRs. It has a fast switching action. The conventional UJT is made up of an N-type silicon base (with terminals bt and b2) to which is alloyed a P-type emitter with terminal e, as shown in Fig. 3a. The symbolic diagram and characteristics of a UJT are shown in Figs. 3c, respectively. A complementary UJT is formed by a P-type base and an N-type emitter. Except for the polarity of voltage and current, the characteristics of a complementary UJT are similar to those of a conventional UJT.

13 are applicable only when the applied voltage is sinusoidal. It is a normal practice to specify the continuous average rating h av of the SCR,. and also its h RMS rating, on the assumption that the SCR carries a full halfcycle sinusoidal current at the specified frequency (50 Hz). As the frequency of operation increases, the SCR has to be derated to account for the additional switching losses. Having computed the internal power dissipation from Eq. 6), it is assumed that this dissipation takes place at the internal junctions of the device.

The gate source voltage is the off-state voltage across each SCR. Because of diode D2, the potential of points c, d will not be the same. The resulting circulating currents may turn on the SCRs. These currents must be minimised by selecting appropriate equalising circuit parameters so that the string is turned on only when a gate signal is applied to the bottom SCR. Another convenient method of firing a string of SCRs employs optical triggering. In this case, a light-activated SCR (LASCR) is connected between the gate and capacitor C through a suitable resistance.

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