Switched-mode power supply control circuit

Details Switched-mode power supply control circuit Switched-mode power supply control circuit

1996-09-13

1998-10-20

Hecker, Stuart N.

Electric power conversion systems

Current conversion

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

363 56, H02M 3335

Patent

active

058256385

ABSTRACT:
A controller for a switch mode power supply includes an undervoltage protection circuit responsive to an input supply voltage indicative signal. The input supply voltage indicative signal is also coupled to a foldback point correction circuit. The correction circuit causes a decrease in a maximum duty cycle of a control signal when the input supply voltage increases and is still smaller than a predetermined magnitude. A zener diode limits the input supply voltage indicative signal in a manner to prevent a further decrease in the duty cycle when the input supply voltage exceeds the predetermined magnitude.

REFERENCES:
patent: 4315305 (1982-02-01), Siemon
patent: 4809150 (1989-02-01), Limuti et al.
patent: 5227964 (1993-07-01), Furuhata
patent: 5349515 (1994-09-01), Megeid
patent: 5359276 (1994-10-01), Mammano
patent: 5453921 (1995-09-01), Shutts
patent: 5508588 (1996-04-01), Wu
patent: 5528483 (1996-06-01), Mohandes
patent: 5534768 (1996-07-01), Chavannes et al.
Siemens--Function and Application of the Switch Mode Powersupply IC TDA 4606, 27 Jul. 1989, pp. 1-50.

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