Power Electronics, Third Edition by Cyril W. Lander

By Cyril W. Lander

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2-2c is given by Vmean=(1/2n) f 9='" VmaxsinOdO (2-4) 9=0 and is lower than the case of no inductance. The single-phase half-wave circuit can be controlled by the use of a thyristor as shown in Fig. 2-4a. The thyristor will only conduct when its voltage VT is positive and it has received a gate firing pulse ig. net/rushd 46 POWER ELECTRONICS (a) Q( ~I ‫ﻣ‬ I ‫ﻜﺘﺒ‬ I ' ~I ‫ﺷﺪ‬ ‫ُﺭ‬ ‫ﺔ‬ I I I I I - -~ Vmean I ~ I I I Yl I ~ (b) I 1---' (c) Figure 2-4 Single-phase half-wave controlled circuit with commutating diode.

Current value at each condition. SOLUTION Figure 1-34 shows the current waveform with the current length shown as fjJ. S. value 1 = (f 21£ 1/2 '" 2 I pk dfjJ 0 ) = Ipk fjJ 1/2 () 21£ ' fjJ Mean value = I pk-, ‫ﻣ‬ 21£ I mean I pk 60 170 1020 416 90 196 784 392 120 218 654 377 ‫ﺷﺪ‬ ‫ُﺭ‬ ‫ﺔ‬ Irm. s. value of the current gives a better consistent guide to the rating than does the mean value, but note must be taken of the current waveform in selecting a thyristor for a particular application. Example 1-5 Two different conditions during the turn-on of a thyristor are shown in Fig.

Using Eq. (1-4) to illustrate overload conditions, the final maximum temperature rise Om,x will be higher because the value of P in Eq. (1-5) will be higher. Reference to Fig. 1-30 shows the temperature rise from the initial cold conditions giving 0m,x) as the rated rise, and 0m,x2for the overload condition. In practice, the junction must not exceed 0m,x)' otherwise the device will be destroyed, hence the overload condition can be tolerated up to the time t) when the junction has reached its maximum rated value.

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