Circuitry using back EMF of a motor to generate a system wake up signal
US6404157B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jul 27, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jul 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/2637
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wakeup signal generating circuit is connected to an input of an electrically driven motor having a drive shaft that is mechanically coupled to a power sliding door or power lift gate of an automobile. The motor is normally responsive to a motor drive signal to control door/lift gate movement via rotation of the motor drive shaft. In the absence of the motor drive signal, the motor is responsive to rotation of the drive shaft, via manual movement of the door or lift gate, to produce a back electromotive force (EMF) signal at the input of the motor. The wakeup signal generating circuit is responsive to the back EMF signal to produce a wakeup signal. In one embodiment, the wakeup signal is used to cause a control circuit controlling the overall operation of the motor to wake up from a reduced-function, power conserving sleep mode of operation and operate in a full-function, full power wakeup mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.