Constant-voltage power supply circuit
US8232783B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2009 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Dec 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/573
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A constant-voltage power supply circuit which limits the consumption current inside at startup or when overloaded and suppresses the occurrence of an overshoot at startup, comprises an error amplifying part; an output part having an outputting PMOS; a load current monitoring part that monitors a load current flowing through the PMOS and increases the bias current of the error amplifying part according to the load current; and a gain adjusting part having a current limiting resistor and that monitors the load current and decreases a gain of the error amplifying part according to this load current. Hence, at startup or when overloaded, the gain adjusting part operates as a limiter circuit. Hence, at startup or when overloaded, the consumption current inside can be limited. Further, at startup, the response is made slower by this limiter operation, thus suppressing the occurrence of an overshoot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.