大众科技
大衆科技
대음과기
DAZHONG KEJI
2014年
3期
91-93,102
,共4页
稳流电路%INA202%基准电压源
穩流電路%INA202%基準電壓源
은류전로%INA202%기준전압원
Stable current circuit%INA202%reference voltage source
基于INA202电流检测芯片设计了一种稳流电路。该稳流电路通过INA202把电流检测电阻上的电流以电压的形式反馈到误差放大器与TL431基准源组成的基准电压进行比较，使调整管调整其集电极电流，控制功率管的基极，随着功率管基极电压的变化，集电极输出不同的电流，最后保持输出电流的稳定。实验表明，电路输出的最大负载调整率为0.186%，具有较高的精度，受负载变化影响小。
基于INA202電流檢測芯片設計瞭一種穩流電路。該穩流電路通過INA202把電流檢測電阻上的電流以電壓的形式反饋到誤差放大器與TL431基準源組成的基準電壓進行比較，使調整管調整其集電極電流，控製功率管的基極，隨著功率管基極電壓的變化，集電極輸齣不同的電流，最後保持輸齣電流的穩定。實驗錶明，電路輸齣的最大負載調整率為0.186%，具有較高的精度，受負載變化影響小。
기우INA202전류검측심편설계료일충은류전로。해은류전로통과INA202파전류검측전조상적전류이전압적형식반궤도오차방대기여TL431기준원조성적기준전압진행비교，사조정관조정기집전겁전류，공제공솔관적기겁，수착공솔관기겁전압적변화，집전겁수출불동적전류，최후보지수출전류적은정。실험표명，전로수출적최대부재조정솔위0.186%，구유교고적정도，수부재변화영향소。
Based on INA202, a kind of stable current circuit was designed. By using INA202, the current flowing through current sense resistor is converted to voltage, and then feedback to error amplifier compared with reference voltage. The reference voltage is provided by TL431 and its peripheral circuit. The output voltage of the error amplifier made regulator transistor regulate collector current to control the power transistor base. With the change of the power transistor base voltage, the collector outputs different current. Finally, the output current is stable. Experimental results show that maximum load regulation is less than 0.186%, and the circuit can work with high precision and small influence of load.
