Audio power amplifier and a pre-amplifier thereof
US7714646B2 · kind B2 · utility
1Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2008 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | May 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2173
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An audio power amplifier includes a pre-amplifier, an error amplifier, a comparator, a bridge circuit, and a feedback circuit, in which the gain of the pre-amplifier gradually increases when the audio power amplifier is powered on. The comparator generates a PWM signal by comparing a reference signal and an amplified audio signal. The bridge circuit has switches controlled according to the PWM signal such that a driving current alternately flows to and from a load. The feedback circuit generates the feedback signal indicating a condition of the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.