PERSON SUPPORT APPARATUS WITH ACTUATOR BRAKE CONTROL

摘要

A person support apparatus includes one or more motorized actuators that are braked in different manners depending upon whether or not electrical power is available to the control system. When electrical power is not available, a delay circuit delays closing a first switch that, when closed, short circuits the terminals of one of the motors. When power is available, other switches are opened and closed in a manner that short circuits the terminals of the motor while the first switch remains open. The other switches may be part of an H-bridge. The control system may also detect back emf (electromotive force) generated by the motor when electrical power is available and issue a notification to a technician or other user if an amplitude and/or duration of the detected back emf exceeds a threshold.

主权项

1. A person support apparatus comprising:
a support surface adapted to support a person thereon; an actuator adapted to move a first component of the person support apparatus with respect to a second component; a motor adapted to power the actuator; and a control system adapted to brake the motor in a first manner when electrical power is supplied to the control system and to brake the motor in a second manner when electrical power is not supplied to the control system, the first and second manners being different.