Floating power supply using dual npn transistor
US6320452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2000 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Oct 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/46
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low supply voltage for operating an operational amplifier operating as a voltage follower is derived from a high voltage source. Two npn transistors, two Zener diodes and a current source are connected in series across the high voltage source. The input voltage (to the operational amplifier) plus a Zener reference voltage is applied to the base of the transistor near the positive terminal of the high voltage source. Then, a low positive supply voltage V+ nearly equal to the input voltage plus the Zener voltage (Vi+Vz) is derived at the emitter. This low positive supply voltage V- is derived by dropping V+ through the two series Zener diodes to obtain a low negative supply voltage equal to (Vi-Vz).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.