Patent ID: 7784127

Claim:
A patient support device comprising: a base; a table assembly supported by the base and configured to support a patient; an actuator assembly electrically coupled to and operable to control motion of the table assembly, the actuator assembly including a motor and a brake; a controller electrically coupled to the actuator assembly, the controller operable to generate a signal to activate the brake when power to the actuator assembly is interrupted; and an dynamic brake assembly electrically coupled to the actuator assembly and the controller, the dynamic brake assembly operable upon deactivation of the brake, the dynamic brake assembly including a passive dynamic load module electrically coupled to the motor to increase speed of the motor, a rectification module electrically coupled to the motor and operable to convert AC voltage to DC voltage when the AC voltage reaches a predetermined value, a controlled dynamic load module electrically coupled to the passive dynamic load module, and a switch operable to deactivate the brake and electrically couple the controlled dynamic load module and the actuator assembly to control a braking operation of the motor.