Patent ID: 8429778
Filing Date: 2013-04-30
Classification: G05B,Y10T

Abstract:
1. A patient-support apparatus comprising: an inflatable support structure; a variable output pump in fluid communication with the inflatable support structure, the variable output pump including an alternating current driver configured to vary the flow of fluid provided to the inflatable support structure by the variable output pump; a drive circuit configured to provide a direct current power signal to the alternating current driver, wherein the drive circuit alternates a current flow of the direct current power signal prior to providing the direct current power signal to the alternating current driver; a power supply configured to provide a direct current power signal to the drive circuit; a processor coupled to the power supply and the drive circuit, wherein the processor is configured to control the current flow provided by the drive circuit, wherein the processor is further configured to control an amount of voltage provided by the power supply to the drive circuit, and the drive circuit is configurable to maintain a substantially similar duty cycle before and after an adjustment in the amount of voltage of the direct current power signal provided by the power supply.