This circuit can greatly enhance stability and accuracy of gas sensors which have start resistance drift but basically constant sensitivity.
该电路适用于起始阻值漂移，而灵敏度基本不变的气敏元件，可大大提高此类元件的稳定性与准确性。
2
A three phase half controlled bridge circuit with constant current and high efficiency is designed in the charged loop of the welding power supply. So a limiting current resistance is canceled.