Multi-stage precharging system to limit power supply transients when printed circuit boards are plugged in
US5909065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/004
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system for limiting power supply transients in a powered up backplane when a printed circuit (PC) board is plugged in. The PC board includes first connecting pins with different lengths connecting to precharge planes on the backplane where each sequentially longer pin length is connected to a precharge plane providing a sequentially lower voltage. The first connecting pins are further connected by precharge circuits to power planes on the PC board. The precharge circuits are configured to ramp current to minimize power supply transients. In one embodiment, the precharge circuits each include a transistor and RC circuit connecting each first connecting pin to a power plane on the PC board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.