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Power factor correction in power conversion applications using the dsPIC DSC

Posted: 13 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:digital signal controller? power factor correction? ADC?

Most of the power conversion applications consist of an AC-to-DC conversion stage immediately following the AC source. The DC output obtained after rectification is subsequently used for further stages.

Current pulses with high peak amplitude are drawn from a rectified voltage source with sine wave input and capacitive filtering. The current drawn is discontinuous and of short duration irrespective of the load connected to the system.

Since many applications demand a DC voltage source, a rectifier with a capacitive filter is necessary. However, this results in discontinuous and short duration current spikes. When this type of current is drawn from the mains supply, the resulting network losses, the total harmonic content, and the radiated emissions become significantly higher. At power levels of more than 500 watts, these problems become more pronounced.

This application note focuses primarily on the study, design and implementation of power factor correction using a digital signal controller (DSC).

Please view the PDF document for more information.

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