Buck (or boost) converter with very fast output current transitions and low ripple voltage
US6897641B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jun 24, 2004 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Jun 24, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33573
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a multiphase buck converter running at precise duty cycles which have an inverse integer relationship with the number of phases and a precise synchronized phase relationship, it is possible to have zero output ripple. If the output inductors are replaced with coupled inductors having nominally the same inductance, and the second windings of the inductors are wired in a loop with correct phasing, under steady state conditions the voltage drop around the loop will be zero. A small voltage injected into the loop can cause very fast transitions in current in the loop, and those currents will be reflected to the first windings of the inductors as a very rapid transition in the output current. This converter has no dc voltage control capability, so it is preferably used with a pre-regulation stage as the control of the dc output voltage. Dynamic voltage control is very fast, as the current into the output capacitor can change very rapidly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.