A COMBINED FEED FORWARD AND FEEDBACK CONTROL TECHNI QUE FOR OPTIMIZATION OF AC-DC DIGITAL SWITCH MODE POWER CON VERTER

The ac-dc digital switch mode power converter (DSMPC) using combined feed forward and feedback control techniques to achieve wide input voltage range is designed to produce a highly regulated and stable direct current (dc) output power that remains stable irrespective of variations in the input/output or load conditions. The data from the feed forward and feedback network is utilized by the hysteresis controller to generate the signal that is used for the switching of the power transistor between cutoff and saturation in order generate the pulsating dc voltage that is applied to primary terminal of the transformer for the step-down transformation action to take place as well as other peripheral functions. The system is controlled by the stored software assembly programming language codes uploaded to the microcontroller and has the ability to perform other valuable functions. The output is regulated using variable frequency and variable duty cycle. The microcontroller generates the pulse width modulated signal for the oscillator circuit by calculating the time of the required duration of on and off periods of its signal using the program code. The work implements digital design, simulation of the power converters. The output to control transfer function and other parameters shown in table 2.