Fast-transient PCCM switching converter with freewheel switching control

被引：42
作者：
Ma, Dongsheng [1 ]
Ki, Wing-Hung
机构：
[1] Univ Arizona, Dept Elect & Comp Engn, Tucson, AZ 85721 USA
[2] Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Hong Kong, Hong Kong, Peoples R China
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2007年 / 54卷 / 09期
关键词：
current ripple; freewheel switching; pseudo-continuous-conduction mode (PCCM); switching converter; transient response; voltage ripple;
D O I：
10.1109/TCSII.2007.900903
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This brief presents a new switching converter operating in pseudo-continuous-conduction mode (PCCM) with freewheel switching control. Compared with conventional discontinuous-conduction mode (DCM) converters, this converter demonstrates much improved current handling capability with reduced current and voltage ripples. The control-to-output transfer function exhibits a single-pole behavior, making the load transient response much faster than its CCM counterparts. Simulation and experimental results show that, with a 6-V, 6-W load and a 10-V unregulated supply, the PCCM converter has a current ripple of only 1.1 A and a ripple voltage of only 58 mV, while a DCM converter has a current ripple of 2.2 A and a ripple voltage of 220 mV. In addition, the PCCM converter takes only 25 mu s to respond to a 500-mA load current change while a CCM one requires 1.4 ms.
引用
收藏
页码：825 / 829
页数：5
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