基于闭环霍尔电流传感器驱动电路的设计

Design of Drive Circuit Based on Closed-loop Hall Current Sensor

基于零磁通霍尔电流传感器的原理和特性,传统的霍尔电流传感器多采用模拟驱动电路,电路输出功率小、调试不方便、抗干扰能力差;针对传统传感器的弊端,介绍了一种基于DSP为核心的数字驱动系统的构成及技术实现。采用DSP作为主控制器,结合CPLD实现信息的分配;设计了驱动系统的硬件电路,包括运算放大电路、DSP处理电路、光耦电路、功率放大电路。设计了系统应用软件,包括主控板的DSP程序、CPLD信息分配程序、上位机应用软件等。分析实验测试的波形和数据,表明设计的传感器数字驱动系统具有良好的不确定度、线性度、抗干扰性,各项指标均已达到设计时的要求,具有广泛的实用性。

The research is mainly according to the principle and characteristics of zero-flux Hall current sensor.Analog driving circuits are mostly adopted in the traditional Hall sensors,which have disadvantages such as low output power,debugging difficulty and low anti-interference capacity.Focusing on the problems of traditional sensors,a DSP based digital driving system is introduced.In which DSP is adopted as main controller,and CPLD is used to allocate information.In addition,the design of hardware circuits and software procedures are presented.The hardware circuits include the operational amplifier circuit,the process circuit,the optocoupler circuit and the amplifier circuit;and the software includes the DSP program,the CPLD program and the host computer software.By analyzing the experiment data and test waveforms,it demonstrates that the system meets the design request and has advantages of uncertainty,linearity and anti-jamming capability.All the indicators have reached the design requirements and have a wide range of practicalities.