Regulator and related method capable of performing pre-charging
US6867572B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Sep 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A regulator and related method for providing a regulated voltage. The regulator includes a bipolar junction transistor (BJT) as a charging circuit, a capacitive circuit formed for regulating the regulated voltage by bypass and regulation capacitors, an operational amplifier (OP-AMP), a bandgap circuit, and a pre-charging circuit. The capacitive circuit receives current to establish the regulated voltage. According to the regulated voltage, the OP-AMP biases the base of the BJT to obtain the accurate regulated voltage to control a current conducted to the capacitive circuit by the BJT. When the regulator starts to work, the OP-AMP is disabled to prevent the BJT from providing current. Instead the pre-charging circuit first provides a pre-charging current to charge the capacitive circuit, then the OP-AMP is enabled to turn on the BJT to charge the capacitive circuit and establish the steady-state regulated voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.