An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM

An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM
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基于阻尼电流模型的优化无传感器电荷平衡控制器,适用于 DCM 运行的反激式转换器

DOI:
10.3390/en11123478
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发表时间:
2018-12
期刊:
MDPI Energies
影响因子:
--
通讯作者:
Run Min
Run Min
中科院分区:
其他
文献类型:
--
作者:
Run Min

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提出了一种基于阻尼型电流模型的无位置传感器电荷平衡(OSCB)控制器,用于工作在不连续导通模式(DCM)的反激式变流器。通过求解非理想变压器电流的全微分方程组,推导出考虑寄生、变压器漏感和阻容二极管吸收电路的阻尼型电流模型。基于该模型,对无位置传感器电荷平衡(SCB)控制器的电流观测和控制算法进行了优化,形成了无位置传感器电荷平衡(SCB)控制策略。在等效离散小信号模型中考虑了平均电流损耗。此外,频率分析表明,OSCB控制器比SCB控制器具有更高的闭环带宽和更低的超调量,这表明OSCB控制器的暂态性能有所改善。最后,在一台反激式变流器样机上对OSCB控制器和传统SCB控制器进行了实验评估。
This paper presents an Optimized Sensorless Charge Balance (OSCB) controller based on a damped current model for flyback converter operating in Discontinuous Conduction Mode (DCM). By solving total differential equations of non-ideal transformer currents, the damped current model is derived with consideration of parasitics, leakage inductance of transformer, and the Resistor-Capacitor-Diode (RCD) snubber circuit. Based on the proposed model, current observation and control algorithms of the Sensorless Charge Balance (SCB) controller are optimized, which forms the OSCB control strategy. The average current damping is considered in the equivalent discrete-time small signal model. Furthermore, frequency analyses show that OSCB controller achieves higher closed-loop bandwidth and lower overshoot than a SCB controller, which indicates an improved transient performance. Finally, both OSCB and conventional SCB controllers are experimentally evaluated on a flyback converter prototype.
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