Flyback converter with feedback and feed forward.

摘要

A constant loop gain is achieved in a flyback type DC to DC converter (102) by use of feedback to correct for load variations and feed forward to correct for line voltage variations. The feedback signal (103) and a reference voltage (Vr) are compared by an error amplifier (104). An output of the error amplifier is multiplied by a constant (112) and is added to a signal (107) proportional to line voltage. The resulting sum (113) causes modification of the slope of a ramp voltage (Vc) which is compared (105) to the voltage at the output of the error amplifier (104) to control the «on times of the converter switching devices.