UNIVERSAL TRIGGERING CIRCUIT FOR POWER ELECTRONICS DEVICES

Electrical Engineering

Power electronic devices are most widely used in an industry for power conversion and for effective control of the various electric equipment. SPWM or sinusoidal pulse width modulation is used for the power electronic devices to control it and to reduce harmonic content present in the system. Nowadays SPWM signal can be generated with the help of microcontroller, microprocessors and FPGAs. But all of these methods require programming or coding which is very tedious and time consuming job. This paper represents how to generate SPWM signals with variable frequency, amplitude, and duty cycle using simple (OP-AMP) circuit and function generator IC’s for triggering and control of various power electronic devices used in the industry. The given circuit is rugged, simple, consumes less power and space. In this circuit SPWM can be generated by comparing high frequency triangular carrier wave with sinusoidal reference wave of desired frequency. The width of each pulse can be in proportion to the amplitude of sine wave. The advantage of sinusoidal pulse width modulation is that it reduces harmonic content of the converter output when fed to the power electronic devices as compare to single pulse width modulation. So this circuit can be effectively implemented in inverters for triggering of power electronic devices to get smooth output. This circuit is also able to generate negative voltage pulse which can be used for turning off of the gate turn off thyristor (GTO). So this circuit can be effectively used for wide voltage and current ratings of various types of power electronic devices.

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