正向電流的意思是從正極流向負(fù)極的電流，簡(jiǎn)稱正向電流。

　　介紹

　　這兩?開(kāi)關(guān)正激變換器的主要優(yōu)點(diǎn)

　　是電源開(kāi)關(guān)只阻斷電源電壓代替兩倍于回掃電壓的電源電壓?jiǎn)?開(kāi)關(guān)正激變換器。

　　在這里，完整的規(guī)范，這兩個(gè)正激變換器的開(kāi)關(guān)?描述：

　　This application note describes the design of 120?W， 125 kHz， two?switch forward current mode converter with the NCP1252 controller. It can viewed the practical implementation of the 2?switch forward converter example described in Ref. ［1］。 The NCP1252 controller offers everything to build cost?effective and reliable ac?dc switching power supplies implementing the forward converter： NCP1252 detects an output overload without relying on the auxiliary Vcc， a Brown?Out input offers protection against low input voltages and improves the converter safety. Finally a SOIC8 package saves PCB space and represents a solution of choice in cost sensitive projects. The power supply described here operates from a dc input voltage， as the forward converter is usually connected after a Power Factor Correction （PFC） stage. It generates a 12?V output at 10 A. The efficiency at full load is close to 90% at the nominal output of the PFC.