Low loss digitally controlled voltage converter
US5892672A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Dec 29, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33515
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a voltage converter for producing a controlled output voltage from an input voltage, particularly in an isolating-transformer switch-mode power supply, a digitally realized control circuit is provided. This circuit contains a counter apparatus whose counter state is compared with a digital comparison value derived from the output voltage to be controlled. The pulse-width-modulated driving of a switching element coupled with an inductive element is carried out dependent on the result of the comparison and on a signal indicating the state of demagnetization of the inductive element. By means of a further comparison value for comparison with the counter apparatus, a turn-on blocking voltage is produced for the switching element, in order to raise the switching frequency for standby operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.