POWER CONVERSION APPARATUS

申请公布号：

US2017047855(A1)

申请号：

US201514876848

申请日期：

2015.10.07

申请公布日期：

2017.02.16

申请人：

Excelliance MOS Corporation

发明人：

Yang Poyu

分类号：

H02M3/335

主分类号：

H02M3/335

地址：

Hsinchu County TW

摘要：

A power conversion apparatus including a transformer, a synchronous rectification (SR) transistor and an SR control circuit is provided. A first terminal of a primary side of the transformer receives an input voltage, and a first terminal of a secondary side outputs a DC voltage. A drain terminal of the SR transistor is coupled to a second terminal of the secondary side of the transformer. A source terminal of the SR transistor is coupled to a ground terminal. The SR control circuit receives a signal of the drain terminal of the SR transistor to serve it as a detection signal and generate a duty cycle signal. The SR control circuit converts the duty signal into a charging current and a discharging current so as to charge and discharge an energy-storage device and generate a first voltage. The SR control circuit turns off the SR transistor according to the first voltage.

主权项：

1. A power conversion apparatus, comprising: a transformer, having a primary side and a secondary side, wherein a first terminal of the primary side is configured to receive an input voltage, and a first terminal of the secondary side is configured to provide an output voltage to a load; a synchronous rectification (SR) transistor, having a drain ten Anal coupled to a second terminal of the secondary side, a source terminal coupled to a first ground terminal and a gate terminal configured to receive a control signal; and an SR control circuit, coupled to the SR transistor, receiving a signal of the drain terminal of the SR transistor and serving the signal as a detection signal, and generating at least one duty cycle signal according to the detection signal, wherein the SR control circuit converts the at least one duty cycle signal into a charging current and a discharging current, charges and discharges an energy-storage device according to the charging current and the discharging current to generate a first voltage and generates the control signal according to the first voltage to disable the SR transistor.