Full-bridge digital power converter controller and method to compensate volt-second imbalance
US7529108B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2007 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jan 20, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33573
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A digital controller for use with a full-bridge power converter which includes an isolation transformer that conducts first and second currents of opposite polarity during respective power-transfer phases. A current transformer senses the currents, and a non-zero current Iin is generated when either of the first or second currents is >0. The controller includes a sigma-delta modulator arranged to integrate a current applied to its input and to modulate the integrated signal to a bitstream. Iin is integrated by a first integrator and the bitstream is decimated to a digital word by a first decimation filter during the first power-transfer phase, and is integrated by a second integrator and decimated with a second decimation filter during the second phase. The difference between the digital values is used to adjust the pulses that operate the full-bridge switches as necessary to reduce any imbalance between the first and second currents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.