开关电源的多模式控制策略及实现

发布时间：2018-05-18 10:07

本文选题：待机功耗 + 多模式　；参考：《浙江大学学报(工学版)》2014年09期

【摘要】：为了减小开关电源的待机功耗和提高系统的工作效率,提出一种多模式调制控制策略并予以实现.该策略主要包括3种调制模式:准谐振调制方式、脉冲频率调制方式和跳周期调制方式.准谐振调制方式在重载时效率较高,但随着负载的降低其开关频率上升,从而使得开关损耗变大;脉冲频率调制方式在中载时效率较高,能够根据负载的变化调节开关频率,避免开关损耗过大造成效率降低;跳周期调制方式在轻载时效率较高,能够在一定时间内使开关管不动作,进一步降低开关损耗.采用700VBCD工艺设计一款集成3种调制模式的开关电源芯片,并针对不同的负载进行优化,比起传统脉冲宽度调制方式,在整个负载范围内的系统效率提高,待机功耗降低.基于该芯片开发的开关电源系统(12V/1A),能够根据负载轻重自适应地在3种调制方式之间平稳切换,其实测待机功耗低于90mW,平均效率大于84%,均优于传统脉冲宽度调制模式的开关电源,可完全满足V2.0版本的"能源之星"标准的要求.
[Abstract]:In order to reduce the standby power consumption of switching power supply and improve the efficiency of the system, a multi-mode modulation control strategy is proposed and implemented. The strategy includes three modulation modes: quasi-resonant modulation, pulse frequency modulation and period hopping modulation. The quasi-resonant modulation mode is more efficient at heavy load, but with the decrease of the load, the switching loss increases, and the pulse frequency modulation mode is more efficient at the middle load, which can adjust the switching frequency according to the load variation. To avoid excessive switching loss, the efficiency is reduced, and the hopping period modulation is more efficient under light load, which can make the switch not operate in a certain period of time, and further reduce the switching loss. A switching power supply chip integrated with three modulation modes is designed by using 700VBCD process and optimized for different loads. Compared with the traditional pulse width modulation mode, the system efficiency in the whole load range is improved, and the standby power consumption is reduced. The switching power supply system based on this chip can adaptively switch smoothly between three modulation modes according to the load level. In fact, the power consumption of the waiting machine is less than 90 MW, and the average efficiency is more than 84, which is superior to the switching power supply with the traditional pulse width modulation mode. Fully meet the V2.0 version of the "Energy Star" standard requirements.
【作者单位】：中国科学院微电子研究所;
【基金】：广东省中国科学院全面战略合作资助项目(2011A090100010) 国家自然科学基金资助项目(61006058)
【分类号】：TN86

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