Current-Mode Variable Frequency Control Technique for SIDO Switching Converter with Independent Charge and Discharge Sequence
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摘要:
单电感双输出（single-inductor dual-output，SIDO）开关变换器工作在共享充放时序下存在电感电流纹波大、输出支路间交叉影响严重以及电路参数宽范围变化下控制电路不能正常工作等问题. 为此，本文提出一种独立充放时序电流型变频控制（current-mode variable frequency control, C-VF）技术. 首先，具体描述变换器在连续导电模式（continuous conduction mode，CCM）下的工作原理，并推导主电路开环传递函数；进一步构建闭环小信号模型，推导闭环交叉阻抗，详细分析不同输出电压及负载电流下变换器的交叉影响特性. 理论分析表明：相较于共享充放时序，独立充放时序C-VF CCM SIDO buck变换器减小了交叉影响，改善了负载瞬态响应性能；当两支路负载电压不等时，减轻某一支路负载可以降低该支路的交叉影响；当两支路输出电压相同但负载不同时，重载支路对轻载支路的交叉影响更小. 仿真和实验证明了上述结论的准确性.
Abstract:Single-inductor dual-output (SIDO) switching converters with shared charge and discharge sequence have problems of the large inductor current ripple and cross-regulation between output branches, and the control circuit fails to work normally under the wide range of changes in circuit parameters. To solve these problems, a current-mode variable frequency control (C-VF) technique with an independent charge and discharge sequence was proposed. First, the working principle of the converter in continuous conduction mode (CCM) was specifically described, and the open-loop transfer function of the main circuit was derived. Furthermore, a closed-loop small signal model was constructed, and the closed-loop cross-regulation impedance transfer functions were derived. The cross-regulation characteristics of the converter with different output voltages and load currents were analyzed in detail. The theoretical analysis shows that compared with the shared charge and discharge sequence, the C-VF CCM SIDO buck convert with independent charge and discharge sequence reduces the cross-regulation and improves the transient load response performance. When the load voltages of the two branches are different, decreasing the load of one branch can reduce the cross-regulation of this branch to another one. When the output voltages of the two branches are the same, but the loads are different, the branch with heavy loads has small cross-regulation on the branch with light load. Simulations and experiments demonstrate the accuracy of the above conclusions.
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图 1 独立式充放时序C-VF CCM SIDO buck变换器
Figure 1. C-VF CCM SIDO buck converter with independent charge and discharge sequence
图 3 独立充放时序CCM SIDO buck变换器小信号等效电路
Figure 3. Small signal equivalent circuit of CCM SIDO buck converter with independent charge and discharge sequence
图 4 独立充放时序C-VF变换器电感电流波形
Figure 4. Inductor current waveforms of C-VF convert with independent charge and discharge sequence
图 5 独立充放时序C-VF小信号模型
Figure 5. Small signal model of C-VF with independent charge and discharge sequence
图 6 开关频率与谷值电流参考值的关系
Figure 6. Relationship between switching frequency and valley current reference value
图 7 负载不同时的闭环交叉影响阻抗Bode图
Figure 7. Bode diagrams of closed-loop cross-regulation impedance with different loads
图 8 独立充放时序C-VF CCM SIDO buck变换器实验装置
Figure 8. Experimental device of C-VF CCM SIDO buck convert with independent charge and discharge sequence
图 9 Iv=0.5 A和Iv=1.1 A时稳态实验波形
Figure 9. Steady-state experimental waveforms with iv = 0.5 A and iv = 1.1 A
图 10 负载不同、负载电压不等时ioa跳变的瞬态实验波形
Figure 10. Transient experimental waveforms with sudden variation of ioa under different loads and unequal load voltages
图 11 负载不同、负载电压不等时iob跳变的瞬态实验波形
Figure 11. Transient experimental waveforms with sudden sudden variation of iob with different loads and unequal load voltages
图 12 负载不同、负载电压相等时负载跳变的瞬态实验波形
Figure 12. Transient experimental waveforms with sudden variation of loads under different loads and equal load voltages
图 13 负载不同、负载电压相等时负载跳变的瞬态实验波形
Figure 13. Transient experimental waveforms with sudden variation of loads with different loads and equal load voltages
表 1 独立充放时序C-VF CCM SIDO buck变换器电路参数表
Table 1. Circuit parameters of C-VF CCM SIDO buck converter with independent charge and discharge sequence
名称 参数值 名称 参数值 Vin/V 20 Ioa/A 1 L/μH 22 Iob/A 1 Voa/V 12 Coa/μF 470 Vob/V 5 Cob/μF 470 
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表 2 不同工况下闭环交叉影响
Table 2. Closed-loop cross-regulation under different working conditions
输出电压/V 负载电流/A 负载跳变/A Fa Voa=12，Vob=5 ioa=1.0，iob=1.0 ioa：1.0→1.5 0.0424 ioa=1.5，iob=1.0 ioa：1.5→2.0 0.0720 ioa=1.0，iob=1.0 iob：1.0→1.5 0.0173 ioa=1.0，iob=1.5 iob：1.5→2.0 0.0300 Voa=5，Vob=5 ioa=1.0，iob=1.5 ioa：1.0→1.5 0.0760 iob：1.5→2.0 0.0672 ioa=1.5，iob=1.0 ioa：1.5→2.0 0.0606 iob： 1.0→1.5 0.0812
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