Dialog Semiconductor Gmbh

Dialog Semiconductor (uk) Limited

Huaming Guo

Jun Zheng

Jianming Yao

Yimin Chen

Eng Hwee Quek

Zhaowu Luo

A switch detection circuit is provided that senses the voltage on a rectifying component for rectifying a secondary winding current through a secondary winding of a flyback converter's transformer to determine whether a power switch transistor attached to a primary winding of the transformer has ceased cycling.

Input voltage detection for flyback converter

A switching power converter () comprises a transformer () with a parasitic capacitance (), a first switch () coupled to the transformer () and configured to couple or decouple a load () to or from a power source via the transformer (), a switch controller () coupled to the first switch () and configured to generate a switch drive signal () for turning on or off the first switch () according to switching cycles, and a bypass circuit configured to provide a bypass path for the parasitic elements such as the parasitic capacitance (). The bypass circuit may be coupled in parallel with the auxiliary winding (), the primary winding (), or the secondary winding () of the transformer (). High frequency ringing and EMI/RFI is reduced when the bypass circuit is enabled.

Switching power converter for reducing EMI from ring oscillation and its control method

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Shenzhen, China

Huaming Guo