Systems and methods to minimize startup transients in class D amplifiers
US7791427B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2007 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Oct 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1515
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods for minimizing startup transients in digital audio controllers that may result in audible artifacts in the output of an audio amplification system. One embodiment comprises a digital PWM amplifier that includes a mechanism for controlling the amount of dead time in the audio output signal. When the amplifier starts up, the PWM signals provided to the output stage are simultaneously deasserted (i.e., there is dead time) for most of each switch period. The amount of dead time is gradually reduced over a series of switch periods until a nominal operating amount of dead time in each switch period is reached. Thus, the PWM signals are slowly ramped up from having a very large percentage of dead time (e.g., nearly 100%) to having a very small percentage of dead time (e.g., 1-2% to prevent shoot-through.)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.