Transformerless fast current limiter with symetry correction for a switched-mode power supply
US4293902A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1979 |
| Grant date | Oct 6, 1981 |
| Priority date | — |
| Expiry date | Dec 4, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/3378
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switched mode power supply employs a pulse width modulation controlled DC-to-DC converter to change a first voltage from a source of DC power into a regulated power source providing direct current at a second DC voltage. A transformerless current-sensing device is adapted for connection in the path between said source and said converter and provides a control signal which is representative of the current flowing in said path. A current-limiter control circuit is responsive to said control signal and provides an enabling output state when the sensed-current exceeds a predetermined value. The enabling state overrides the pulse width modulator control and inhibits the converter, thus terminating the output pulse when the sensed current exceeds said predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.