According as the sinusoidal pulse width modulation ( SPWM) technology, this contravariant device adopts the contravariant bridge circuit of three-phase and double-electrode as its main circuit, the power field effect transistor as its contravariant tube and the digital integrated circuit as its control circuit. 依据正弦波脉宽调制(SPWM)技术,汽车空调蒸发风机逆变器主电路采用三相双极性逆变桥式电路,逆变管采用功率场效应晶体管,控制电路采用数字集成电路。
As designing technique of the digital system and manufacturing process of integrated circuit are improving, the kinds of faults caused by transistor defect have became a main effect to digital circuit, which bring a strong challenge to the traditional testing methods. 随着数字系统设计技术的发展和电路集成度的提高,由晶体管缺陷导致的各种故障对电路的影响也越来越大,这给传统的测试技术带来了严峻的挑战。