Measuring and testing – Volume or rate of flow – System
Patent
1977-09-06
1979-03-20
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
361154, G01F 160
Patent
active
041447514
ABSTRACT:
A square-wave signal generator circuit for generating a rectangular waveform signal particularly for application to the field coil of an electromagnetic flow meter. A coil excitation current from a direct current source is switched to provide a current flow in alternate directions through the field coil. During the transient time of the coil excitation current following the switching operation, a higher output voltage from the source is used to shorten the current rise and fall times while a lower voltage from the source is used during a steady state time of the excitation current to minimize power losses. A switching circuit using a switching transistor is used to select the higher voltage while a back-biased diode is used to immediately introduce the lower voltage when the excitation current has reached a steady state. A voltage comparator is used to compare the voltage generated by the excitation current with a reference voltage to produce an output signal for operating the switching transistor between its on and off states during the transient and steady state current conditions, respectively.
REFERENCES:
patent: 3396314 (1968-08-01), Corson et al.
patent: 3550446 (1970-12-01), Tucker et al.
patent: 3634733 (1972-01-01), Boyer
patent: 3852646 (1974-12-01), Mason
patent: 3955413 (1976-05-01), Steele et al.
Burton Lockwood D.
Halista Mitchell J.
Honeywell Inc.
Marhoefer Laurence J.
Ruehl Charles A.
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