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同步整流Boost变换器中过零检测电路的设计

更新时间:2020-10-27 22:19:23 大小:748K 上传用户:gsy幸运查看TA发布的资源 标签:Boost变换器过零检测电路 下载积分:2分 评价赚积分 (如何评价?) 收藏 评论(0) 举报

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为了减少同步整流Boost变换器在轻载模式下电流倒灌现象的发生,设计了一种新型的过零检测电路,以检测电感续流为零所用时间为依据判断电感电流是否为零,从而及时关闭同步整流管,有效限制电感电流的倒灌。基于0.35μm CMOS工艺进行设计及仿真验证,电感电流在4.4 mA时同步整流管关闭,且静态功耗仅为2μA。应用于一款PFM控制模式的同步Boost变换器芯片,经流片后测试,电感电流稳定,倒灌电流很小,性能优良。

To reduce the occurrence of current backflow in the light-load mode of synchronous rectification boost converter,a novel zero-crossing detection circuit is designed to judge whether the inductor current is zero or not based on the time taken to detect the freewheeling current of the inductor,thus turning off the synchronous rectifier in time and effectively limiting the backflow of the inductor current.The zero-crossing detection circuit is designed and verified based on 0.35 μm CMOS process.The simulation result shows that the synchronous rectifier is turned off when the inductor current is 4.56 mA,and the static power consumption is only 2 μA.It has been applied to a synchronous Boost converter chip in PFM control mode.The inductor current is stable,the reverse current is small and the performance is excellent.

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