Voltage supply circuit, audio output apparatus, and voltage supplying method
US9118291B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 2013 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Jan 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage supply circuit is provided. The voltage supply circuit includes a voltage amplifier and a power selecting circuit. A power terminal of the voltage amplifier receives an operation power and outputs a gain voltage for driving an output device. The power selecting circuit receives a plurality of supply voltages and supplies one of the supply voltages to the power terminal of the voltage amplifier as the operation power according to a volume level of an audio signal. An audio output apparatus and a voltage supplying method thereof are also provided. The audio output apparatus includes the voltage supply circuit and a speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.