Circuit module with hot-swap control circuitry
US5530302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1994 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Jan 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/1414
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit board capable of live-insertion or hot-swapping into a live chassis backplane. The circuit board is provided with a power control circuitry for gracefully ramping up board power after insertion, or gracefully removing power just prior to physical removal of a circuit board from the board slot. A pair of ejector levers are provided on each side of the circuit board. A push button switch is provided proximate one ear thereof and is selectively opened or closed depending upon the position of an ejector cover which can be secured thereover in an interlocking relationship. Upon retraction of the extractor cover, the switch is opened, and the converse applies. Power MOSFETs are provided between the card edge and the board power busses which are gracefully turned on and off as a function of the switch position. A high-side gate driver provides an increased bias voltage, which bias voltage is communicated through the closed switch to the gates of the MOSFETs. An RC network is coupled to the MOSFET gate to determine the time constant at which bias voltage will be ramped up or ramped down to correspondingly ramp power up or down to the circuit board power busses. A power supply mon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.