Digital Sensorless Current Mode Control Based on Charge Balance Principle and Dual Current Error Compensation for DC-DC Converters in DCM
Digital Sensorless Current Mode Control Based on Charge Balance Principle and Dual Current Error Compensation for DC-DC Converters in DCM
复制标题
DCM 中基于电荷平衡原理和双电流误差补偿的数字无传感器电流模式控制 DC-DC 转换器
DOI：
10.1109/tie.2015.2464192
复制
发表时间：
2016-01-01
影响因子：
7.7
通讯作者：
Liu, Zhenglin
中科院分区：
文献类型：
--
作者：
Min, Run;Tong, Qiaoling;Liu, Zhenglin
对于具有数字无传感器电流模式（DSCM）控制的不连续导电模式（DCM）DC-DC转换器，由于电流观测器精度低，会出现观测电流误差。此外，由于电流控制器的低精度或电流环的有限直流增益，会出现参考电流误差。传统上，所观察到的电流被补偿以增加电流调节精度，而参考电流误差被忽略。然而，对于基于电荷平衡原理（CBP）的数字散斑相关控制（CBP-DSCM），本文证明了参考电流应补偿与观测电流相同的量。否则，单补偿或不等补偿会导致输出电压稳态误差。为此，提出了CBP-DSCM控制的双电流误差补偿策略。该方法通过电流误差观测器对误差进行等量补偿，该观测器考虑了寄生效应，无需近似计算电流误差。为了验证所提出的策略，小信号模型与寄生的转换器和控制器的关键变量的微分函数构造。此外，在典型的操作条件下，变换器的稳定性进行了分析，而在各种操作条件下的稳定性进行了验证，通过鲁棒性分析。最后，仿真和实验结果验证了分析和改善的变换器的瞬态响应。
For discontinuous conduction mode (DCM) dc-dc converters with digital sensorless current mode (DSCM) control, an observed current error occurs, owing to a low-accuracy current observer. Moreover, a reference current error occurs due to a low-accuracy current controller or a finite dc gain of current loop. Conventionally, the observed current is compensated to increase current regulation accuracy, whereas the reference current error is neglected. However, for charge balance principle (CBP)-based DSCM (CBP-DSCM) control, this paper proves that the reference current should be compensated in a same quantity to that of observed current. Otherwise, single or unequal compensation leads to output voltage steady-state error. For this reason, a dual current error compensation strategy for CBP-DSCM control is proposed. It compensates the errors in a same quantity through a current error observer, which considers parasitics and calculates the current errors without approximation. To verify the proposed strategy, small-signal models with parasitics for both the converter and the controller are constructed by differential functions of key variables. Furthermore, converter stability is analyzed at typical operation condition, while the stability at various operation conditions is verified through robustness analysis. Finally, simulations and experimental results verify the analysis and the improved transient response of the converter.