Systems and methods to auto-adjust zero cross circuits for switching regulators
US9257908B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2013 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Aug 8, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Various embodiments of the present invention provide for an adaptive and accurate zero cross circuit that can operate without directly sensing an inductor current. Certain embodiments allow adjustment of a zero crossing condition while eliminating the need for a blanking time. In certain embodiments this is accomplished by detecting the effects of turning off a switch on a switching node voltage of a buck converter. Some embodiments use a counter to lengthen or shorten the delay time between an inductor crossing a zero value and the effect of the switching event. In one embodiment, the effect of the switching event includes a change in the direction of the switching node voltage from which the direction of a current flowing in the buck converter inductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.