Audio amplifier
US6844777B2 · kind B2 · utility
9Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2003 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Dec 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/331
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transformer 11, which converts input current into voltage output, is arranged between a power switch 1, which amplifies and outputs audio signals based on the power source voltage VDD supplied to MOS transistors Q1 to Q4, and a speaker 3. Through appropriately determining the turns ratio (Ns/Np), without causing the power source voltage VDD of the power switch 1 to be large, large voltage Vs is made to occur at both ends of the speaker 3 from such small power source voltage VDD. Through this, large output power can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.