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一种适用于同步整流开关电源的过零检测电路

更新时间:2020-10-23 18:31:31 大小:556K 上传用户:gsy幸运查看TA发布的资源 标签:整流开关电源 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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提出了一种适用于同步整流模式开关电源的过零检测电路。该电路通过将同步整流管的漏端电压信号转化成电流信号,并将该电流与偏置电流进行比较,从而确定同步整流管续流过程中电流是否为零。由于使用与整流管同类型的晶体管做线性化电阻进行电压到电流的转化,从而消除了传统过零检测电路中整流管电阻随温度和工艺变化对过零检测精度的影响。基于0.6um CD工艺,对所设计电路进行了仿真验证。仿真结果表明,该电路在给定的工艺和温度波动范围内都能够实现高精度的过零检测,具有较强的鲁棒性,并且该电路功耗仅为6uA。

A kind of zero-detect circuit applicable to synchronous rectifier mode switching power supply is proposed in this paper. This circuit converts the drain-source voltage of low-side power transistor to current signal, and then conforms whether or not the eurrent of low-side power transistor is zero through comparing the current signal and the bias current. Due to the use of the same type transistor with low-side power transistor as a linearization resistor, the drawbacks of the variations of power transistor's on-resistance with process and temperature can be eliminated. The zero-detect circuit is simulated with a standard 0.6 um CD process. The results indicate that the circuit can realize accura...

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一种适用于同步整流开关电源的过零检测电路.pdf 556K

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