Switched-mode power supply control circuit
US5959851A · kind A · utility
36Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.