一种新型地址变化探测技术在SRAM中的应用

本文提出了一种采用两级电路实现的地址变化探测器。与传统地址变化探测电路相比较,该设计显著提高了SRAM的抗噪声、抗干扰能力。

基于无相移同步旋转滤波结构的绕组开放式发电系统无位置传感器控制

绕组开放式多输入源发电系统具有结构简单、生产成本低等优点。为实现绕组开放式系统的无位置运行,提出一种基于无相移同步旋转滤波器法。通过对系统的电压电流关系分析,建立基于绕组开放式发电系统简化数学模型的滑模观测器。分析传统同步旋转滤波结构中低通滤波器产生的相位滞后,论证直接同步旋转滤波算法的误差迭代问题,再将经典锁相方法产生的位置角用于传统同步旋转滤波器中的坐标变换,直接对滑模观测器输出进行滤波,得到一种具有无相位延迟优点的同步旋转滤波新结构。最后在一台基于永磁磁通切换电机的绕组开放式发电系统样机上进行实验,验证了该方法的正确性与有效性。

Rotor Position Estimation for Single-and Dual-Three-Phase Permanent Magnet Synchronous Machines Based on Third Harmonic Back-EMF under Imbalanced Situation

In this paper,an improved rotor position estimation strategy based on third harmonic back-EMF for single-and dual-three-phase permanent magnet synchronous machines(PMSMs)under imbalanced situation is proposed.Due to the imbalanced machine impedance,back-EMF or sensing resistor network,the measured triplen harmonic back-EMF will contain certain fundamental component distortion which may severely deteriorate the performance of rotor position estimation.With the aid of the fundamental component compensator,this distortion can be significantly compensated,and the rotor position estimation error can be minimized considerably.The proposed strategy has been implemented on a dSPACE platform with a prototype of dual-three-phase PMSM with serious imbalanced parameters,and operate at single-and dual-three-phase conditions.The experimental results prove that the proposed strategy can significantly improve the steady-state and dynamic performance of rotor position estimation under imbalanced situation.