ISOLATED DC/DC CONVERTER, POWER SUPPLY, POWER SUPPLY ADAPTOR, ELECTRONIC DEVICE USING THE SAME, AND PRIMARY SIDE CONTROLLER
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United States of America Patent
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Issued Date -
Jun 23, 2016
app pub date -
Dec 11, 2015
filing date -
Dec 17, 2014
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Abstract
An isolated DC/DC converter includes: a transformer having a primary winding and a secondary winding; a switching transistor connected to the primary winding of the transformer; a rectification element connected to the secondary winding of the transformer; a photo coupler; a feedback amplifier connected to an input side of the photo coupler and configured to generate an error current which increases as an output voltage of the DC/DC converter decreases; a primary side controller having a feedback terminal and configured to switch the switching transistor with a larger duty ratio as a feedback voltage of the feedback terminal becomes lower; and a feedback circuit connected to an output side of the photo coupler and the feedback terminal and configured to reduce the voltage of the feedback terminal as a feedback current flowing through the output side of the photo coupler increases.
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