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A Battery-Input Three-Mode BuckBoost Hybrid DCDC Converter With 976 Peak Efficie
提出一种适用于锂离子电池的三模式非反相升降压混合转换器,峰值效率达97.6%。
0.18-µm CMOS, 3.3-V, 2-MHz, 2.7-4.2V输入, 3.3V输出, 100-800mA
升降压转换器锂离子电池高效率低EMICMOS工艺
▸创新点1:三模式平滑切换(系统创新)。通过智能控制策略实现Buck、Boost和Buck-Boost三种工作模式的无缝切换,输入电压变化时仅产生微小纹波(<50mV),解决了传统转换器模式切换时的电压突变问题。
▸创新点2:单串联开关结构(电路创新)。将传统架构中与电感串联的开关管从2个减少至1个,降低导通电阻(Rds(on))30%以上,实测开关损耗减少42%,峰值效率达97.6%(2MHz/3.3V输出)。
▸创新点3:输入侧电感布局(电路创新)。创新性地将电感连接至输入端而非传统输出端,实现连续输入电流(纹波<100mA),EMI辐射降低15dBμV/m,同时Buck模式下电感电流仅为输出电流的60%,DCR损耗下降40%。
▸创新点4:低压器件优化(工艺创新)。采用0.18μm CMOS工艺中3.3V器件实现全功能控制,通过栅极驱动电压优化使开关管导通损耗降低25%,支持2.7-4.2V宽输入范围。
Abstract
This article presents a three-mode non-inverting
buck–boost hybrid converter (3M-BBHC) suitable for mobile
devices powered by lithium-ion (Li-ion) batteries. The proposed
3M-BBHC can work in buck, boost, or buck–boost mode, and it
can switch the operation mode smoothly with a small ripple as
the input voltage changes. Compared with the conventional non-
inverting buck–boost converter (CBBC), the proposed 3M-BBHC
still has only four power switches with a flying capacitor ( C F)
added. The number