Power-saving circuit and method thereof
US7538452B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2007 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Jun 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a power-saving circuit applied in a portable electronic device, which includes a voltage input module for outputting a first enable signal after receiving an external voltage, a power switch for being operated by a user to output a second enable signal and a start signal, a switching module electrically coupled to the voltage input module and the power switch for selectively receiving the first and second enable signals to determine whether or not to turn off the switching module, and a voltage conversion module electrically coupled to the switching module for receiving one of the external voltage and a battery voltage from the voltage input module when the switching module is closed. Thus, the battery voltage cannot be sent to the portable electronic device when the switching module is opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.