Active start timing control in failure mode

Abstract

A power switch transistor of the switching power converter is maintained conductive by the Zener breakdown voltage during a restart period after a fault condition of the switching power converter. The source voltage from the power switching transistor is used to charge the VCC capacitor, which stores the supply voltage for the controller of the switching power converter.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to U.S. Provisional Patent Application No. 62 / 446,344, filed January 13, 2017, which is hereby incorporated by reference in its entirety. technical field [0003] This application relates to switching power converter controllers, and more particularly to switching power converter controllers with active start-up timing control. Background technique [0004] The high efficiency of switching power converters such as flyback converters has led to their virtually universal suitability as battery chargers for mobile devices. Because flyback converters convert AC household voltage, fault conditions such as short circuits can be potentially dangerous. It is thus common for flyback converter controllers to monitor various fault conditions. If the controller detects that a fault condition exists, it stops cycling the power switches and enters a restart period. At the end of the re...

AI Technical Summary

Problems solved by technology

Thus, the problem with the prior art dependence on V_IN changes is that the restart timing cannot be accurately predicted

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