Low power consumption controller for weight sensing article inpu

Details Low power consumption controller for weight sensing article inpu Low power consumption controller for weight sensing article inpu

1990-03-02

1991-03-19

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177 50, G01G 314, G01G 1952

Patent

active

050002759

ABSTRACT:
A low power consumption controller for weight based article input and removal monitoring apparatus comprises a continuously active weight monitoring section responsive to the weight sensor output(s) for producing a first control signal in response to predetermined changes in the sensed weight; and a signal analysis section switchable from an inactive mode to an active mode in response to the first control signal for analyzing the sensor output(s), and for controlling the operation of the weight monitoring section. The weight monitoring section comprises: timing circuitry for generating first and second timing signals in a predetermined timed relation to each other independent of control by the signal analysis section and a third timing signal in predetermined timed relation to the first and second timing signals under the control of the signal analysis section; a switch responsive to the first timing signal for controlling connection of a sensor power supply to the sensor(s) to provide intermittent operation of the sensor(s); signal sensing circuitry responsive to the second and third timing signals for producing successive weight sample signals from the sensor output; signal comparing circuitry responsive to the weight sample signals and to a threshold signal produced by the signal analysis section for producing the first control signal.

REFERENCES:
patent: 4696359 (1987-09-01), Glibbery
patent: 4909340 (1990-03-01), Kazais et al.

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