Power supply unit and portable device
US8120344B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2005 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Feb 15, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A power supply unit, adapted to provide a predetermined output voltage from its output circuit, compares a feedback voltage associated with the output voltage of the output circuit with a reference voltage so as to control the output circuit. The power supply unit is enabled and disabled in response to an externally supplied operation command signal. The reference voltage is generated by a reference voltage generation circuit, which is operable on the voltage of the operation command signal, and is controllably enabled when the voltage of the operation command signal exceeds a predetermined level, but otherwise disabled. Thus, the reference voltage is stabilized to improve the ripple rejection characteristic of the power supply unit without increasing its current consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.