Flyback converter control with feed forward

Details Flyback converter control with feed forward Flyback converter control with feed forward

1980-06-16

1981-11-17

Shoop, William M.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 37, 363 80, 363 97, H02M 3335

Patent

active

043014976

ABSTRACT:
A constant loop gain is achieved in a flyback type DC to DC converter by use of feedback to correct for load variations and feed forward to correct for line voltage variations. The feedback signal and a reference voltage are compared by an error amplifier. An output of the error amplifier is multiplied by a constant and is added to a signal proportional to line voltage. The resulting sum causes modification of the slope of a ramp voltage which is compared to the voltage at the output of the error amplifier to control the "on" times of the converter switching devices.

REFERENCES:
patent: 3818306 (1974-06-01), Marini
patent: 3863140 (1975-01-01), Easter et al.
patent: 3909696 (1975-09-01), Katov et al.
patent: 4079294 (1978-03-01), Teuling
IBM Technical Disclosure Bulletin, vol. 22, No. 6, pp. 2191-2192, "Circuit to Linearize the Control Loop of a Switching Voltage Regulator", R. E. Calvo, G. C. Johari.

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