PRE-REGULATOR WITH PROTECTION AGAINST VOLTAGE RINGPRE-REGULATOR WITH PROTECTION AGAINST VOLTAGE RINGING ON TURN-OFF ING ON TURN-OFF

摘要

A power integrated circuit pre-regulator AC/DC converter circuit which employs a slow turn-off lateral insulated gate bipolar transistor (LIGBT) device as the switching transistor so as to reduce the decay time of a current generated by the parasitic inductance in the circuit upon turn-off of the LIGBT device, thereby to substantially reduce the level of a ringing voltage produced at the drain of the LIGBT device.