CAJ | 학술논문

随着科技的进步，电子秤原有的精度已经不能满足市场要求，影响其精度的因素主要有：传感器、模数转换器（ADC）的选择．文章提出一种简单实用并且精度高的电子秤设计方案，使测量精度得到大大提高．设计分四个模块：称重传感器、滤波电路、A／D转换电路，通过外部LED显示模块显示称量结果．电路应用电阻应变桥式传感器来采集电压的微小变化，通过电感与电容组成的抗干扰滤高频杂波作用的EMI滤波器，减小外部环境对电子秤电路的影响，由电阻和电容组成的一阶RC滤波器，用来限制输入信号的带宽，降低输入信号的噪声；经过内部集成差分放大电路和高性能的∑-△ADC（过采样模数转换器）的A／D转换芯片AD7799，对输入电压信号进行放大并转换成数字量输出；显示模块采用驱动器PS7219驱动四位八段LED显示器构成，显示实际测量值．电子秤系统总体设计实现了测量精度的大幅度提高．另外，设计电路集成度高、抗噪声能力强、滤波效果显著，因而具有很好的系统稳定性和测量准确性．
수착과기적진보，전자칭원유적정도이경불능만족시장요구，영향기정도적인소주요유：전감기、모수전환기（ADC）적선택．문장제출일충간단실용병차정도고적전자칭설계방안，사측량정도득도대대제고．설계분사개모괴：칭중전감기、려파전로、A／D전환전로，통과외부LED현시모괴현시칭량결과．전로응용전조응변교식전감기래채집전압적미소변화，통과전감여전용조성적항간우려고빈잡파작용적EMI려파기，감소외부배경대전자칭전로적영향，유전조화전용조성적일계RC려파기，용래한제수입신호적대관，강저수입신호적조성；경과내부집성차분방대전로화고성능적∑-△ADC（과채양모수전환기）적A／D전환심편AD7799，대수입전압신호진행방대병전환성수자량수출；현시모괴채용구동기PS7219구동사위팔단LED현시기구성，현시실제측량치．전자칭계통총체설계실현료측량정도적대폭도제고．령외，설계전로집성도고、항조성능력강、려파효과현저，인이구유흔호적계통은정성화측량준학성．
Alongwith the progresses in technology, the accuracy of the original electronic scale can no longer meet the market requirements. Judging from the status, the factors affecting the accuracy are the selections of sensors and ADC. A simple practical and high - precision design of the electronic scale has been proposed in this research, which makes measurement accuracy be greatly enhance. The circuit is composed of four modules:weighing sensors, filtering, A/D conversion and external LED display module which display weighing results. Application of the resistance strain sensor in design to capture small changes in voltage;the EMI filter, composed of anti, clutter the role of high - frequency, to reduce the impact from external environment to the circuit, using the first - order RC filter, to limit the bandwidth of input signal, elbow input signal noise;using the A/D conversion chip AD7799 that contains the differential amplifier circuit and a high- performance ∑ -△ADC (over sampled ADC), to enlarge the input voltage signal then convert it into digital output; using PS7219 to drive the LED displays which can show the actual measured values. The design of Electronic scale system achieve a substantial increase in measurement precision. In addition, its high integration density, strong noise resisting ability and obvious filtering effect for circuit, which make good stability and measurement accuracy for system.