Selective restart circuit for an electronic device

Details Selective restart circuit for an electronic device Selective restart circuit for an electronic device

H - Electricity

02

J

H02J 7/00 (2006.01) H04B 1/16 (2006.01) H04M 1/00 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2166881

Radiotelephones often are powered by batteries (12). When a radiotelephone is bumped, the battery (12) can lose electrical contact with the radiotelephone. When power is interrupted (40), a timer is started (42). When the power is reapplied (44), the timer is sampled (46) and compared against a predetermined period of time. If the power was interrupted for a short time, then the radiotelephone is turned on (50). If the power was interrupted for a long time, then the radiotelephone stays off (48). The timer in the circuit is implemented as an RC circuit (26) starts to discharge. If the voltage level falls below Vref, the radiotelephone will not turn on when the power is reapplied.

Les radiotéléphones sont souvent alimentés par des batteries (12) qui, si l'appareil reçoit un choc, peuvent cesser d'être en contact. Un minuteur (42) s'enclenche en cas d'interruption (40) de l'alimentation et lorsque l'alimentation se rétablit (44) le minuteur est échantillonné (46) et comparé avec une durée de temps prédéterminée. Si l'interruption a été courte, l'appareil téléphonique est mis en marche (50). Si l'interruption à été longue, l'appareil reste à l'arrêt (48). Le minuteur du circuit de met en route lorsqu'un circuit RC (26) commence à se décharger. Si la tension tombe au-dessous d'un niveau de référence Vref, l'appareil ne se remet pas en marche lorsque l'alimentation est rétablie.

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