一种高效PFM同步整流BOOST型DC-DC变换器的设计

发布时间：2018-05-15 09:08

本文选题：升压型DC-DC变换器 + 峰值电流限制　；参考：《东南大学》2015年硕士论文

【摘要】：随着电子技术的不断发展,不断涌现的便携式电子设备越来越方便和丰富了人们的生活。这些电子设备普遍都是采用电池供电,所以电池供电已经成为主要的趋势,这就对电源管理芯片提出了更高的要求。高精度、高效率、高集成度、低成本、低电源电压、低功耗、快速瞬态响应等方向是未来电源管理芯片发展的重要趋势。随着能源成本的提升,节能成为任何电子产品无法回避的因素,尤其是DC-DC变换器。另外,由于开关电源大部分时间工作在轻载条件下,因此研究轻载下高效率的DC-DC变换器具有重要意义。本文设计了一款轻载下高效率、峰值电流模式的升压DC-DC变换器。它采用峰值电流反馈的电流控制脉冲频率调制(PFM)同步整流的方式,同时内部集成了最大导通时间和最小关断时间逻辑控制模块进一步增加效率。另外芯片还具有自适应重启的功能,当电流超过设定的峰值电流阈值时,内部软启动电路可起到电路保护的作用。当系统恢复正常后,芯片可自适应启动。另外芯片还具有输入欠压锁定、过温保护以及浪涌电流限制和软启动功能。本文所设计的升压型DC-DC变换器,采用了Cadence, HSPICE对电路进行了设计和仿真,采用韩国东部0.35um BCD工艺,并对芯片进行了测试。芯片输入为2V～3.3V时,可稳定输出10V,在轻载2mA时,转换效率高于85%,输出电压纹波小于30mV,静态电流小于30μA,同时具有良好的负载调整率和线性调整率。该芯片可应用于3D眼镜驱动程序和小液晶显示器偏置电源。
[Abstract]:With the development of electronic technology, portable electronic devices have become more and more convenient and enriched people's lives. These electronic devices are generally powered by batteries, so battery power supply has become the main trend, which puts forward higher requirements for power management chips. High precision, high efficiency, high integration, low cost, low power supply voltage, low power consumption and fast transient response are the important trends of power management chips in the future. With the increase of energy cost, energy saving has become an unavoidable factor for any electronic products, especially DC-DC converters. In addition, it is very important to study the high efficiency DC-DC converter under light load because the switching power supply works most of the time under light load. In this paper, a high efficiency and peak current mode boost DC-DC converter under light load is designed. It adopts the current control pulse frequency modulation (PFM) synchronous rectifier with peak current feedback and integrates the maximum on time and minimum turn-on time logic control modules to further increase the efficiency. In addition, the chip also has the function of adaptive restart. When the current exceeds the set threshold of peak current, the internal soft start circuit can play the role of circuit protection. When the system returns to normal, the chip can start adaptively. In addition, the chip also has input undervoltage locking, over-temperature protection, surge current limitation and soft-start function. The boost DC-DC converter designed in this paper is designed and simulated by Cadence and HSPICE, and the chip is tested by 0.35um BCD technology in East Korea. When the chip input is 2V~3.3V, it can output 10V stably. At light load 2mA, the conversion efficiency is higher than 85mV, the output voltage ripple is less than 30mV, the static current is less than 30 渭 A. at the same time, it has good load adjustment rate and linear adjustment rate. The chip can be used in 3 D glasses driver and small LCD bias power supply.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46

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