Method of blower control
US5182826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1991 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G2203/34
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for controlling the blower that supplies gas to the gas sacks of a patient support system uses a blower control circuit, a microprocessor, and a pressure sensor. The blower control circuit controls the power that is supplied to operate the blower. The microprocessor activates the blower control circuit with a control signal that causes the control circuit to supply power to the blower. A pressure sensor measures the pressure of the gas exiting the blower and supplies a signal indicative of this pressure, to the microprocessor. The microprocessor stores the measured pressure signal and calculates a reference pressure for the blower. The microprocessor compares the reference pressure to the measured pressure and determines any discrepancy resulting from this comparison. The microprocessor sends a signal to the blower control circuit, wherein the signal is indicative of the discrepancy from the compared pressure and the reference pressure of the blower. The second control signal is such as to enable the blower circuit to reduce the discrepancy calculated by the microprocessor between the reference pressure and the measured pressure. Only discrepencies of a certain magnitude w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.