The torque output in a permanent magnet brushless DC motor (BLDCM) is usually controlled by regulating the motor phase currents. In this paper, three kinds of PWM strategies together with some critical review on trad...The torque output in a permanent magnet brushless DC motor (BLDCM) is usually controlled by regulating the motor phase currents. In this paper, three kinds of PWM strategies together with some critical review on traditional current measurements in a BLDCM drive system are discussed. A novel method for assessing the PWM information and measuring the motor phase currents by a dc link current sensor is proposed. An attractive feature of the proposed method is the simplicity with the current sample processing because there is no need to incorporate the conduction information of the power switches or diodes. Only the single sided PWM or the double sided complementary PWM is needed with the proposed technique.展开更多
Aiming at piezoresistive pressure sensors, this paper studies simulation of standard pressure by using benchmark current source and self-calibration of the sampling data characteristics. A data fusion algorithm for sa...Aiming at piezoresistive pressure sensors, this paper studies simulation of standard pressure by using benchmark current source and self-calibration of the sampling data characteristics. A data fusion algorithm for sample set is presented which transforms a surface problem into a curve fitting and interpolation problem. The simulation result shows that benchmark current source simulating pressure is successful and data fusion algorithm is effective. The maximum measurement error is only 0.098 kPa and maximum relative error is 0.92% at 0-45 kPa and -10-45~C.展开更多
高失调电压和低磁场灵敏度严重影响了CMOS集成2D垂直型霍尔传感器的应用。提出了一种新颖的2D垂直型霍尔传感器失调消除和信号放大电路。采用2相旋转电流调制和相关双采样解调技术实现了对霍尔失调有效消除;采用信号复用技术实现了对X轴...高失调电压和低磁场灵敏度严重影响了CMOS集成2D垂直型霍尔传感器的应用。提出了一种新颖的2D垂直型霍尔传感器失调消除和信号放大电路。采用2相旋转电流调制和相关双采样解调技术实现了对霍尔失调有效消除;采用信号复用技术实现了对X轴和Y轴输入的2D霍尔信号进行相同处理,避免了2轴霍尔信号之间的放大误差,大大降低了电路的功耗。基于CSMC 0.8μm高压CMOS工艺进行了电路设计,仿真结果表明该电路能最大消除40 m V霍尔失调电压,并对最小0.4 m V的2轴霍尔信号放大并线性输出霍尔电压。输出霍尔电压的线性度大于99.9%,电路静态功耗小于20 m W。展开更多
文摘The torque output in a permanent magnet brushless DC motor (BLDCM) is usually controlled by regulating the motor phase currents. In this paper, three kinds of PWM strategies together with some critical review on traditional current measurements in a BLDCM drive system are discussed. A novel method for assessing the PWM information and measuring the motor phase currents by a dc link current sensor is proposed. An attractive feature of the proposed method is the simplicity with the current sample processing because there is no need to incorporate the conduction information of the power switches or diodes. Only the single sided PWM or the double sided complementary PWM is needed with the proposed technique.
基金Project supported by the National Natural Science Foundation of China （Grant No.40265001）, and the Science Foundation of Yunnan Province （Grant No.2002C0038M）
文摘Aiming at piezoresistive pressure sensors, this paper studies simulation of standard pressure by using benchmark current source and self-calibration of the sampling data characteristics. A data fusion algorithm for sample set is presented which transforms a surface problem into a curve fitting and interpolation problem. The simulation result shows that benchmark current source simulating pressure is successful and data fusion algorithm is effective. The maximum measurement error is only 0.098 kPa and maximum relative error is 0.92% at 0-45 kPa and -10-45~C.
文摘高失调电压和低磁场灵敏度严重影响了CMOS集成2D垂直型霍尔传感器的应用。提出了一种新颖的2D垂直型霍尔传感器失调消除和信号放大电路。采用2相旋转电流调制和相关双采样解调技术实现了对霍尔失调有效消除;采用信号复用技术实现了对X轴和Y轴输入的2D霍尔信号进行相同处理,避免了2轴霍尔信号之间的放大误差,大大降低了电路的功耗。基于CSMC 0.8μm高压CMOS工艺进行了电路设计,仿真结果表明该电路能最大消除40 m V霍尔失调电压,并对最小0.4 m V的2轴霍尔信号放大并线性输出霍尔电压。输出霍尔电压的线性度大于99.9%,电路静态功耗小于20 m W。
