Body-diode conduction detector for adaptive controlling of the power stage of power converters
US10320297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2017 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Oct 25, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit to detect body diode conduction in a switch with an adaptive dead-time scheme for a switched mode power supply. The body-diode of a first switch entering conduction means the first switch is OFF and a second switch can be turned ON. The body diode conduction detector circuit (BDCD) uses relative analysis of the switching node voltage (VLX). The BDCD circuit acts as a voltage follower in a first phase and a comparator in a second phase. The BDCD circuit tracks VLX during the first phase and samples and holds VLX+VREF=VHOLD at the end of the first phase. During the second phase, the BDCD circuit compares VLX+VHOLD to VREF. When the body-diode of the first switch enters conduction VLX will become negative and VLX+VHOLD will drop below VREF, and toggle the logic level output of the comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.