Backup circuit for electricity supply, elevator system, and method for ensuring electricity supply of an electronic overspeed governor

摘要

A backup circuit for supplying electricity to an electronic overspeed governor in connection with a malfunction of a main electricity supply is disclosed. The backup circuit includes an energy storage. The backup circuit is configured to disconnect the supply of electricity from the energy storage to the electronic overspeed governor with a delay when the malfunction of the main electricity supply is detected, and when the malfunction of the main electricity supply continues for a predetermined amount of time, restarting the supply of electricity from the energy storage to the electronic overspeed governor.

主权项

1. A backup circuit for supplying electricity to an electronic overspeed governor in connection with a malfunction of a main electricity supply, the backup circuit comprising:
an energy storage; a switch provided between the energy storage and the electronic overspeed governor; and a releasing delay circuit which forms a control signal for opening the switch in order to disconnect the supply of electricity supply from the energy storage to the electronic overspseed governor with a delay when a malfunction of the main electricity supply is detected, wherein the disconnection delay for the electricity supply of the electronic overspeed governor is determined on the basis of a stopping delay of an a apparatus monitored by the electronic overspeed governor, and when the malfunction of the main electricity supply occurss, the switch of the backup circuit is configured to close for restarting the supply of electricity from the energy storage to the electronic overspeed governor.