• Aditya Sankar Sengupta
• G. Raam Dheep

This paper presents circuit methodology in which a constant DC voltage source or power supply has been given from which an exponentially decaying voltage can be generated by the application of buck converter circuit. The circuit methodology presented shows the generation of switching pulse of exponentially decaying duty ratio decaying from 1 to zero which will be used to operate the controlled switch of the buck converter. This in turn will result in the generation of output voltage which will follow the decay curve of the duty ratio. Also it must be kept in mind that the amplitude of the switching pulse must be high enough to trigger the controlled switch of the buck converter. This decaying voltage can be used in charging devices in which voltage decreases over time as the device charges or could be used to resemble the characteristic of discharging supercapacitor. The components used in the circuit have been specified. The current at the beginning of the exponentially decaying voltage shall be decided by the load connected at the output of the buck converter or the load running on the exponentially decaying voltage and operating frequency of converter ranges from 1to 2Khz.

loop ,control, duty ratio, buck, switching pulse

"Generation of Exponentially Decaying Voltage of Desired Time Constant ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.151-154, January 2019, Available :http://www.jetir.org/papers/JETIRDX06024.pdf

"Generation of Exponentially Decaying Voltage of Desired Time Constant ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp151-154, January 2019, Available at : http://www.jetir.org/papers/JETIRDX06024.pdf