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A Simple Gate-Pulse Generating Circuit for Single-Phase Line-Commutated Thyristor Converter

Tapan Kumar Chakraborty 1, Shahruk Osman 1, and Ariful Islam 2
1. Department of Electrical and Computer Engineering, Presidency University, Dhaka, Bangladesh
2. Department of Electrical and Electronics Engineering, Atish Dipanakar University of Sc. & Tech., Dhaka, Bangladesh
Abstract—The design and implementation of a simple gate-pulse generating circuit for single-phase controlled rectifier under variable input voltage and variable frequency conditions is presented in this paper. The control scheme is consisting of voltage sensor, uncontrolled rectifier, comparator, differentiator, monostable multivibrator, amplifier and pulse transformer. The triggering pulses for the thyristors are generated by comparing the voltage sensor output with the reference dc voltage derived from the uncontrolled rectifier. It is found that the firing angle can be controlled satisfactorily from 0° to 90° by changing the reference voltage. The firing angle, once adjusted, remains constant irrespective of the changes in ac supply voltage and frequency.
 
Index Terms—constant firing angle, converter, natural commutation, thyristor, varable voltage and frequency

Cite: Tapan Kumar Chakraborty, Shahruk Osman, and Ariful Islam, "A Simple Gate-Pulse Generating Circuit for Single-Phase Line-Commutated Thyristor Converter," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 5, pp. 403-407, October 2016. doi: 10.18178/ijeee.4.5.403-407
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