Open-Loop Instability of the Bridge Rectifier with Input Filter

The instability characteristics of the bridge rectifier with input filter are described. A stability criterion based on the perturbational analysis is proposed. According to this criterion, the steady-stale circuit variables during stable operation are employed to examine the stability of the rectifier. Thereby, a simple and flexible stability method is developed. The method is applied to six-pulse and two-pulse bridge circuits with LC type input filter. The accuracy of the results is verified by experiment. The effects of converter output ripple, input voltage distortion, and type of gating circuit on the stability of the converter are examined experimentally and justified theoretically. Finally, the stability condition is determined explicitly in terms of the circuit parameters.