Power supply controller having frequency foldback and volt-second duty cycle clamp features
US5710697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Mar 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33546
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply controller implementing frequency foldback and volt-second duty cycle clamp features. An oscillator timing capacitor is charged with a fixed current and is discharged with a fixed current when the output voltage is above a predetermined level and with a decreasing current when the output voltage falls below the predetermined level, so as to decrease the power supply operating frequency during short circuit or overload fault conditions. A volt-second duty cycle clamp circuit limits the duty cycle to a maximum value which is independent of the tolerance of a capacitor which sets the maximum duty cycle as a function of the power supply input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.