Csmc Technologies Fab2 Co., Ltd.

Southeast University

Congming Qi

Sen Zhang

Longxing Shi

Weifeng Sun

Shen Xu

Lihui Gu

Siyu Zhao

Xiaoyu Shi

A synchronous rectification control system and method for a quasi-resonant flyback converter are provided. The control system includes a switching transistor voltage sampling circuit configured to sample an output terminal voltage of the switching transistor to obtain a sampled voltage of the switching transistor; a sampling calculation module configured to obtain a dead-time based on the sampled voltage of the switching transistor and a preset relationship, the preset relationship being a correspondence between the duration of the sampled voltage of the switching transistor being below a first preset value and the dead-time during an on-time of a switching cycle of the switching transistor, the dead-time being a time from when the switching transistor is turned off to when the synchronous rectification transistor is turned on; and a control module configured to receive the dead-time and control switching of the synchronous rectification transistor based on the dead-time.

Synchronous rectification control system and method for quasi-resonant flyback converter

An integrated circuit chip and a manufacturing method therefor, and a gate drive circuit, the integrated circuit chip comprising: a semiconductor substrate (), a high voltage island () being formed in the semiconductor substrate (); a high voltage junction terminal (), the high voltage junction terminal () surrounding the high voltage island (), a depletion type MOS device (N) being formed on the high voltage junction terminal (), a gate electrode and a drain electrode of the depletion type MOS device (N) being short connected, and a source electrode of the depletion type MOS device (N) being connected to a high side power supply end (VB) of the integrated circuit chip; and a bipolar transistor (Q), a collector electrode of the bipolar transistor (Q) being short connected to the substrate and being connected to a low side power supply end (VCC) of the integrated circuit chip, an emitter of the bipolar transistor (Q) being connected to a gate electrode of the depletion type MOS device (N).

Integrated circuit chip and manufacturing method therefor, and gate drive circuit

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Wuxi New District, China

Congming Qi