Method and apparatus for implementing soft switching in a class D amplifier
US7501889B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 2006 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Feb 10, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/459
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides lossless switching by configuring the output inductor so that the ripple current amplitude at load conditions results in small negative current during switching. The reconfigured output inductor results in increased ripple current amplitude. This increased ripple amplitude may be further controlled using zero ripple steering techniques to eliminate ripple at the output capacitor. A ripple steering technique involves adding a secondary output to the class D amplifier which steers the switching ripple away from the main output thus substantially relieving the main output from a major artifact of prior art Class D amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.