Power supply circuit with secondary side to primary side communication
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United States of America Patent
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Jul 17, 2018
Grant Date -
Dec 21, 2017
app pub date -
May 19, 2017
filing date -
Jun 20, 2016
priority date (Note) -
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Abstract
An electrical circuit for a power supply includes a primary-side controller integrated circuit (IC) that outputs a drive signal on a switch pin to control a switching operation of a switch that is coupled to a primary winding of a transformer. The primary-side controller IC places the switch pin at high impedance during a sense window and turns on the switch in response to sensing a dynamic detection signal on the switch pin during the sense window. The dynamic detection signal is induced by a secondary-side controller IC by controlling switching of a switch that is coupled to a secondary winding of the transformer when the output voltage drops below a predetermined threshold during standby or other low load conditions.
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