一种低功耗高精度数显扭矩测量系统设计

Design of low-power consumption and high-precision measurement system of digital torque

针对便携式数显扭矩测量系统的功耗及精度问题,设计了一种具有低功耗、高精度的便携式数显扭矩测量系统。系统采用了内部具有16位ADC(SD16)的超低功耗单片机MSP430F425为核心,优化设计了测量模块外围电路及高质量电源电路,保障了系统的高测量精度;同时增设了零功耗RS232通信电路,运用间歇性供电的软件管理模式,有效降低了系统的运行功耗。实验结果表明,系统在低功耗模式下,最大工作电流不超过3μA;测量相对误差小于3‰。有效地延长了电池的使用寿命,提高了系统的测量精度。

For the power consumption and accuracy in the measurement system of portable digital torque ,a low‐power consumption and high‐precision measurement system of portable digital torque is designed in this paper .On the basic of MSP430F425 micro‐controller ,using as the core with MSP430F425 micro‐controller which contains 16‐bit ADC ,the peripheral circuit of measurement module and high‐quality power circuit are optimized and designed ,which ensures high measurement accuracy of the system ;Meanwhile ,that zero‐power RS232 communication circuit is designed working with software management mode of intermittent power reduces operational power consumption of the system .Experimental results show that maximum working current of the system is no more than 3 μA when it is in the low‐power mode ;the relative‐error of measurement is less than 3‰ .The design extended battery life effectively and improved measurement ac‐curacy of the system .