Performance Analysis of Tri-state Boost Converter with Dynamic Reference Current Control
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摘要: 为了提高工作于伪连续导电模式（pseudo continuous conduction mode，PCCM）的三态Boost变换器的效率、负载范围和瞬态响应性能，研究了一种动态参考电流（dynamic reference current，DRC）控制策略. 详细分析了DRC控制三态Boost变换器的工作原理，并比较了采用恒定参考电流（constant reference current，CRC）控制和DRC控制的三态Boost变换器的效率和负载瞬态响应性能，分别推导了它们的负载范围表达式，最后，通过实验对理论分析进行验证. 研究结果表明：与CRC控制相比，DRC控制三态Boost变换器的轻载效率提高了14%；在全负载范围内均能工作于PCCM模式，负载范围宽；负载减轻和增加时，调节时间分别减少了37.5%和32.0%，电压超调量分别减小了69.7%和61.9%，瞬态响应性能好.
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关键词:
- 三态Boost变换器 /
- 动态参考电流控制 /
- 效率 /
- 负载范围 /
- 瞬态响应
Abstract: To improve the efficiency, load range, and transient response performance of a tri-state boost converter operating in the pseudo continuous conduction mode (PCCM), the dynamic reference current (DRC) control was studied. First, the principles of the DRC controlled tri-state boost converter were analysed. Further, its conversion efficiency and load transient response performance were compared with those of the tri-state boost converter with constant reference current (CRC) control. Furthermore, their corresponding load range expressions were deduced. Finally, the theoretical analyses were verified by experiment. The results show that the efficiency of the DRC controlled tri-state boost converter in the light-load condition is improved by 14% compared with that of the CRC controlled tri-state boost converter. Moreover, the DRC controlled tri-state boost converter can operate in PCCM within full-load range. When the load is reduced and increased, the regulation time is decreased by 37.5% and 32.0%, and the voltage overshoot is decreased by 69.7% and 61.9%, respectively. -
图 2 负载减轻后电感电流的稳态波形示意
Figure 2. Steady-state waveforms of inductor current after the load decreases
图 3 负载增加后电感电流的稳态波形示意
Figure 3. Steady-state waveforms of inductor current after the load increases
图 4 CRC控制三态Boost变换器的稳态实验波形
Figure 4. Experimental steady-state waveforms of CRC controlled tri-state Boost converter
图 5 DRC控制三态Boost变换器的稳态实验波形
Figure 5. Experimental steady-state waveforms of DRC controlled tri-state Boost converter
图 6 CRC控制和DRC控制三态Boost变换器的效率曲线
Figure 6. Efficiency curves of CRC controlled and DRC controlled tri-state Boost converters
图 8 CRC控制三态Boost变换器的负载瞬态实验波形
Figure 8. Experimental load transient waveforms of CRC controlled tri-state Boost converter
图 9 DRC控制三态Boost变换器的负载瞬态实验波形
Figure 9. Experimental load transient waveforms of DRC controlled tri-state Boost converter
表 1 三态Boost变换器参数
Table 1. Parameters of the tri-state Boost converter
参数 物理量 取值 Vg 输入电压/ V 10 Vo 输出电压/ V 25 L 电感/μH 270 C 电容/μF 470 R 负载电阻/Ω 12.5～25.0 T 开关周期/μs 20 Idc 谷值参考电流/ A 5 k1 iL增益系数 0.5 k2 io增益系数 0.5 × 2.5 
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表 2 三态Boost变换器负载瞬态性能
Table 2. Load transient performance of tri-state boost converter
控制方法 调节时间/ms 超调量/V 减载 加载 减载 加载 电压型CRC 13.6 10.0 3.3 2.1 电压型DRC 8.5 6.8 1.0 0.8
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