便携式车载高增益DC-DC变换器大信号稳定控制策略:基于扰动观测器的反步技术

充电效率低和可用里程短等问题严重阻碍了电动汽车的进一步发展。由于前级电动汽车输出电压较低,需采用便携式高增益DC-DC变换器实现电动汽车间快速能量交互。该文以交错并联双升压变换器为研究对象,采用基于扰动观测器的反步控制算法,提高变换器抵抗内外干扰的能力。扰动观测器对系统寄生参数进行等效估计,提高了系统抵抗内部参数扰动的鲁棒性;同时实时估计输出功率和输入电压,减少使用传感器以降低系统成本。利用扰动观测器的输出,进一步设计了反步控制器,以严格保证系统大信号意义上的稳定性。此外,文中采用相电流平衡补偿器,解决了六通道之间的均流问题,减少热损失并提高了设备的使用寿命。最后,仿真和实验结果验证了提出控制器的有效性。

Delta Sigma调制器非理想因素建模(英文)

系统构建并研究了开关电容积分器DeltaSigma调制器非理想因素行为级模型.重点实现一种运放非线性直流增益模型,仿真表明它更有效反映奇次谐波失真,为保证模型真实性,综合考虑调制器其他非理想因素,如时钟抖动、量化器失配、采样噪声、开关非线性电阻以及运放参数(色化噪声、饱和电压、增益带宽、摆率等).

ΣΔ调制器中非线性直流增益建模

分析了运算放大器有限直流增益和非线性直流增益对ΣΔ调制器的影响,通过双曲正切函数模拟运算放大器的输入输出特性,由积分器的递归解法构造了一个调制器模型.该模型可用于系统级仿真来预测非线性直流增益对调制器性能的影响,系统级仿真和电路级仿真证明此模型行之有效.

High-Consistency Behavior Modeling of a Switched-Capacitor Sigma-Delta Modulator in SIMULINK

To improve the simulation accuracy of SIMULINK, a novel inclusive behavior model of an integrator is proposed that introduces the effects of different circuit nonidealities of a switched-capacitor sigma-delta modulator into SIMULIK simulation. The nonlinear DC gain and nonlinear settling process are introduced into the op-amp module. The signaldependent charge injection and nonlinear resistance are introduced into the switch module. In addition, the noise source including flicker and thermal noise is introduced into system as an independent module. The novel model is verified by SIMULINK behavioral simulations. The results are compared with results from circuit level simulation in Cadence SPICE using TSMC 0.35μm mixed signal technology. It shows that the novel model succeeds in introducing the influences of the nonidealities into behavior simulation to more realistically describe the circuit performances and increase the accuracy of SIMULINK simulation.

Delta Sigma调制器非理想因素建模

提出并构建了开关电容积分器Delta Sigma调制器非理想因素行为级模型,该模型基于Matlab中的Simulink工具,包含开关非线性、时钟抖动、量化器非线性和积分器非线性等调制器非理想因素,能为电路模块的设计提供精确的设计指标.重点研究并实现一种运放非线性直流增益模型,仿真结果表明它能更有效反映奇次谐波失真.同时综合考虑调制器其他非理想因素,例如采样噪声、开关非线性电阻以及运放参数(色化噪声,增益带宽,摆率,饱和电压),仿真得到其对调制器性能的影响.