30kA闭环式集成霍尔电流传感器设计

30 kA closed-loop integrated Hall current sensor design

基于0.18μm CMOS工艺设计了一种大量程闭环式集成霍尔电流传感器。采用片内高灵敏度霍尔器件检测待测电流产生的磁场并线性输出霍尔信号,霍尔电压经过线性放大、失调消除和比例积分调节后与三角载波进行比较产生PWM波,驱动全桥式功率放大电路工作。功率放大电路输出的电流送入聚磁环的二次绕组后形成一个闭环的二次侧补偿,使聚磁环气隙中的霍尔器件处于零磁通状态,从而提高了大电流检测的精度。仿真结果表明,所设计的集成霍尔电流传感器的最大测量范围为30 kA,准确度为1级,功耗小于1.08 W,芯片面积仅有0.2 mm2。

A large-scale closed-loop integrated Hall current sensor is designed based on the 0.18μm CMOS technology.The on-chip high-sensitivity Hall device is used to measure the magnetic field generated by the detected current and linearly output Hall signal.After linear amplification,offset cancellation,and proportional integral(PI)regulation,the Hall voltage is compared with the triangular carrier to generate a PWM signal for driving the full-bridge power amplifier.The output current from the power amplifier is then sent to the secondary winding of the magnetic ring to form a closed-loop secondary side compensation,so that the Hall device in the magnetic ring air gap is in a zero magnetic flux state,thereby improving the accuracy of high current detection.Simulation results show that the designed integrated Hall current sensor achieves a high measurement range of 30 kA,the high accuracy level of 1,the low power consumption of 1.08 W,and the low chip area occupation of 0.2 mm^2.