By M. Ramamoorty
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Additional resources for An Introduction to Thyristors and Their Applications
This reduces the base drive of the bottom transistor; the corresponding decrease in its collector current lowers the base drive of the top transistor. Because of this cumulative action, the ocbs of the two transistors decrease, and when their sum is less than 1, internal regeneration stops and the device goes to the off-state. Thus, the gate can be used for both turning on and turning off the device. This is called the gate-controlled switch (GCS) or the gate turn-off switch (GTO), and its operation is limited to low anode-to-cathode currents.
14 shows the electrical equivalent of the thermal circuit. Capacitor C1 corresponds to the thermal capacity of the junction. The 1j - Tc = Pd avRs, Heat input Junction--. J +,_____-" C~Caslng Fig. 14 Electrical equivalent of thermal circuit. thcrm~l resistance between the junction and casing is R.. Cc and Rc are THYRISTORS 31 the thermal capacity and thermal resistance, respectively, of the surrounding medium. The heat input is represented by a current source. When the potential of node J is such that the current through Re is equal to the input current, the steady state is reached.
T---- Max permiss1ble gate current 21 THYRISTORS forward characteristics, and curves OP and OQ correspond to the possible spread of the characteristics for SCRs of the same rating. For best results, the operating point S, which may change from S 1 to S 2, must be as close as possible to the permissible Pv. curve and must be contained within the maximum and minimum limits of gate voltage and gate current. This will provide the necessary hard drive for the device. If Ev. is the source voltage, then the gradient of line AS will give the required gate source resistance Rv,.
An Introduction to Thyristors and Their Applications by M. Ramamoorty
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