Phase feed-forward control for output voltage AC line ripple suppression in digital power supply
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United States of America Patent
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May 22, 2018
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app pub date -
May 17, 2017
filing date -
May 17, 2016
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Abstract
A power supply has a first stage for performing AC-DC voltage conversion and power factor correction and a second stage for isolated DC-DC voltage conversion. The power supply includes a feed forward mechanism for transmitting phase information corresponding to AC ripple. The phase information is transmitted from the first stage to a secondary side of the second stage as a digital signal using a low speed optical coupler, where the phase information is utilized by a DC-DC digital controller to implement AC ripple suppression using both phase compensation and amplitude compensation.
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