Boot and shoe making
Patent
1988-09-15
1990-11-13
Hindenburg, Max
Boot and shoe making
128680, 128682, 128677, 128679, A61B 502
Patent
active
049694669
ABSTRACT:
A blood pressure monitor having a motor driven air pump for inflating an blood pressure cuff, and a control system for controlling the voltage applied to the motor to regulate the rate at which the cuff is inflated. The control system utilizes a microprocessor to calculate a desired inflation rate and then compare the desired inflation rate with the actual inflation rate to generate a control signal in the form of a pulse-width modulated square wave. The square wave is low-pass filtered to generate a voltage reference that is applied to one input of a comparator. The other input of the comparator receives a feedback signal indicative of the voltage applied to the motor. The comparator generates a sqaure wave having a duty cycle that is a determined by the polarity of the comparison at its inputs. The square wave modulates a semi-conductor switch which, in turn, controls the voltage applied to the motor.
REFERENCES:
patent: 4178918 (1979-12-01), Cornwell
patent: 4252127 (1981-02-01), Gemelke
patent: 4378807 (1983-04-01), Peterson et al.
patent: 4493326 (1985-01-01), Hill et al.
patent: 4510940 (1985-04-01), Wesseling
patent: 4567899 (1986-02-01), Kamens et al.
patent: 4832039 (1989-05-01), Perry et al.
Hindenburg Max
Longo Robin R.
SpaceLabs Inc.
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