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针对正弦波无刷直流电机中霍尔传感器的开关点高对称性要求,设计了一款采用新型迟滞比较器的霍尔传感器。通过Silvaco TCAD仿真软件确定了霍尔盘的磁灵敏度等参数,并利用4个方形霍尔盘对称布局结构以减小失调电压。相比于传统的施密特触发器,所提出的新型迟滞比较器采用完全镜像的电路结构来保证其开关点的对称及其精确设定。采用CSMC 2μm双极工艺对设计进行流片验证,测试结果表明,该霍尔传感器的工作点和释放点的磁感应强度平均值分别为5.57 m T和-5.60 m T,漂移误差为±1.00 m T,等效失调电压为±0.20 m V,具有较小的漂移误差和失调电压以及稳定的温度特性,满足实际需求,具有良好的应用前景。
Aiming at the high symmetry of switching point of Hall sensor in the brushless DC motor with sine wave, a Hall sensor with a new hysteresis comparator is designed. Silvaco TCAD simulation software to determine the Hall magnetic sensitivity and other parameters, and the use of four square Hall plate symmetrical layout to reduce the offset voltage. Compared with the traditional Schmitt trigger, the proposed new hysteresis comparator uses a fully mirrored circuit structure to ensure the symmetry of its switching point and its precise setting. The CSMC 2μm bipolar technology is used to verify the design. The test results show that the average magnetic flux density of the Hall sensor is 5.57 m T and -5.60 m T, respectively. The drift error is ± 1.00 m T , The equivalent offset voltage is ± 0.20 mV, with a small drift error and offset voltage and stable temperature characteristics to meet the actual needs, has a good prospect.