| 一种分段输出PWM Buck DC-DC转换器设计 |
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| 引用本文： | 袁军,周怡,毛鼎昌,赵汝法,王巍.一种分段输出PWM Buck DC-DC转换器设计[J].微电子学,2021,51(2):198-202. |
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| 作者姓名： | 袁军 周怡 毛鼎昌 赵汝法 王巍 |
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| 作者单位： | 重庆邮电大学 光电工程学院/国际半导体学院, 重庆 400065 |
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| 基金项目： | 重庆市科技局产业化项目(cstc2018jszx-cyztzx0217,cstc2018jszx-cyztzX0048) |
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| 摘 要： | 为了解决PWMDC-DC在轻负载时转换效率骤降的问题,设计了一种分段输出级PWM DC-DC电路结构,用以优化轻负载时的转换效率.该设计引入了负载电流检测电路,对输出电流进行采样并检测.在重载情况下,所有功率MOSFET同时输出.当负载电流减小,逐级关闭各段功率MOSFET,直至在最轻载情况下用最小尺寸的功率MOSFE...
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| 关 键 词： | 分段输出 PWM 负载电流检测 转换效率 |
| 收稿时间： | 2020/6/12 0:00:00 |
Design of a PWM Buck DC-DC Converter with Segmented Output |
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| YUAN Jun,ZHOU Yi,MAO Dingchang,CHIO U Fat,WANG Wei.Design of a PWM Buck DC-DC Converter with Segmented Output[J].Microelectronics,2021,51(2):198-202. |
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| Authors: | YUAN Jun ZHOU Yi MAO Dingchang CHIO U Fat WANG Wei |
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| Institution: | College of Optoelec. Engineer. / Int. Semicond. College, Chongqing Univ. of Posts and Telecomm., Chongqing 400065, P. R. China |
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| Abstract: | In order to solve the problems that the conversion efficiency of PWM DC-DC dropped sharply at light load, a PWM DC-DC circuit with a segmented output stage was proposed, which was used to optimize the conversion efficiency of light load. A load current detection circuit was introduced to sample and detect the output current. When the load was heavy, all power MOSFETs were output at the same time. When the load current was reduced, the power MOSFETs were turned off from the first stage to the second stage gradually, until the smallest size power MOSFET was only working in the lightest load. The simulation results showed that within a load range of 1~200 mA, the conversion efficiency of the proposed DC-DC converter changed more smoothly. At the light load of 1 mA, the conversion efficiency of the circuit was 81%. |
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