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Energy Storage Devices for Electronic Systems by Nihal Kularatna

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Appendix A

capacitors and AC line filtering

Co-author: Nicoloy Gurusinghe

One of the most common applications of capacitors is to apply them as AC line frequency filters in AC to DC converters. Usually a half-wave or a full-wave bridge rectifier is used together with an electrolytic capacitor of a sufficient value, to smoothen out the rectified waveform so that the output is an average DC voltage with a limited peak to peak 50/60 or 100/120 Hz ripple waveform superimposed on the DC average. In this short discussion we will compare the performance of electrolytic capacitors and supercapacitors in AC-DC converters to show why the present-day supercapacitors are not suitable for the specific application.

Figure A.1 depicts a simple full bridge ...

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