Apparatus and method for controlling a power supply
US9454169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 2014 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | May 20, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/468
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatuses and methods for controlling a power supply are provided. First power supply selecting circuit selects a higher voltage from USBIN and ACIN to be first output voltage; first LDO decreases the first output voltage to second output voltage, and closes self-start circuit after receiving reference voltage; second power supply selecting circuit selects a higher voltage from second output voltage and VBAT to be third output voltage; second LDO supplies the third output voltage as the first input voltage to reference circuit; reference circuit outputs the reference voltage according to first input voltage; second LDO closes self-start circuit after receiving the reference voltage; voltage detecting circuit supplies an enable signal to second LDO when determining that USBIN or ACIN reaches a threshold voltage according to the reference voltage; and second LDO provides the first input voltage to reference circuit after receiving the enable signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.