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Abstract: As per international agency regulation (IEC 1000-3-2/EN 61000-3-2) and market
expectation, it is important to reduce current harmonics in the AC line current drawn by SMPS/ UPS
connected to AC Mains as source and also it is desired by the user to deliver maximum power output
by achieving unity power factor. To achieve the above objectives in SMPS/ UPS, APFC is required to
be implemented as front end power interface between SMPS/UPS and AC Mains source. This study
explores low cost design solution – DSP based APFC for Industry involved in manufacturing/supply of
SMPS/UPS.
Key words: Digital signal processor (DSP), active power factor corrector (APFC), sinusoidal current
(no harmonics), power factor (PF), voltage mode controller, current mode controller,
switching mode power supply (SMPS), un-interrupted power supply (UPS)
expectation, it is important to reduce current harmonics in the AC line current drawn by SMPS/ UPS
connected to AC Mains as source and also it is desired by the user to deliver maximum power output
by achieving unity power factor. To achieve the above objectives in SMPS/ UPS, APFC is required to
be implemented as front end power interface between SMPS/UPS and AC Mains source. This study
explores low cost design solution – DSP based APFC for Industry involved in manufacturing/supply of
SMPS/UPS.
Key words: Digital signal processor (DSP), active power factor corrector (APFC), sinusoidal current
(no harmonics), power factor (PF), voltage mode controller, current mode controller,
switching mode power supply (SMPS), un-interrupted power supply (UPS)
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