基于开关电容DC-DC转换器的两路主从输出策略

doi:10.16180/j.cnki.issn1007-7820.2020.06.007

摘要/Abstract

摘要：

传统的多路输出开关电容直流-直流转换器的线性调整率与负载调整率不够理想。针对这一问题,文中采用两路时分复用的输出方法,在控制开关相位交织的情况下,分别对主路和从路进行能量传输,并给出具体的调制策略。该输出策略中,主路采用脉冲频率调制,从路则采用脉冲跳跃调制。同时,文中引入平均频率概念,实现了对驱动能力的量化表征。在Cadence软件下进行电路设计,并进行仿真。仿真结果表明,主路的线性调整率为3.01%,负载调整率为3.54%;从路的线性调整率为3.75%,负载调整率为4.28%。

关键词: DC-DC转换器, 双路输出, 时分复用, 脉冲频率调制, 脉冲跳跃调制, 线性调整率, 负载调整率

Abstract:

The linear regulation and load regulation of traditional DC-DC converter is not ideal. Aiming at this problem, this paper adopted a output method of dual output time division multiplexing. In the case of control switch phase interleaving, the master-slave output were transmitted respectively, and the specific modulation strategy was proposed. PFM was adopted for the master output and PSM was utilized for the slave output. Meanwhile, the concept of average frequency was introduced to realize the quantitative characterization of driving capability. Circuit design and simulation were carried out under Cadence software. The simulation results showed that the linear regulation of master output was 3.01% and the load regulation was 3.54%; the linear regulation of slave output was 3.75% and the load regulation was 4.28%.

Key words: DC-DC converter, dual output, time division multiplexing, pulse frequency modulation, pulse skipping modulation, linear regulation, load regulation

中图分类号:

TN432

吴涵涵,卜刚. 基于开关电容DC-DC转换器的两路主从输出策略[J]. 电子科技, 2020, 33(6): 35-39.

WU Hanhan,BU Gang. Dual Master-Slave Output Strategy Based on Switching Capacitor DC-DC Converter[J]. Electronic Science and Technology, 2020, 33(6): 35-39.

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设计指标	大小及范围
输入电压	2.64.2 V
输出电压(主/从)	1.8 V/1.2 V
负载电流	≤60 mA
负载电容	20 μF
时钟频率	50850 kHz
飞跨电容大小	300 pF
线性调整率	≤5%
负载调整率	≤5%
上电速度	≤1 ms