Voltage regulator circuit
US6031363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/227
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage regulator which has two regulation circuits and a comparator for controlling the two regulation circuits is disclosed. The input of the comparator is connected to a power supply voltage such that the output of the comparator changes states when the power supply voltage reaches a predetermined voltage of around 8 volts. The first regulation circuit is enabled to provide the Vcc from the battery voltage until the power supply voltage reaches around 8 volts which is when the comparator changes states. At that point, the first regulation is disabled and the second regulation circuit is enabled to provide the Vcc voltage from the power supply voltage. Since the power supply voltage never reaches the load dump high voltages, the second pass transistors never gets exposed to a high voltage condition. Also, the first transistor can withstand higher voltages since its base is grounded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.