Correction circuit

Details Correction circuit Correction circuit

1976-10-06

1978-06-06

Schaefer, Robert K.

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

73194E, 73194M, 324 75, H02K 300, H02K 364

Patent

active

040938719

ABSTRACT:
A correction circuit for correcting the frequency of the output pulses produced by a gas flowmeter in dependence on the temperature of the gas comprises a control input for receiving a voltage representative of the difference between the temperature of the gas and a reference temperature. A voltage-controlled oscillator, operative during fixed short periods initiated by each flowmeter pulse, produces auxiliary pulses at a rate dependent on the voltage at the control input, and the auxiliary pulses are counted in a counter. Each time the counter counts a predetermined number of auxiliary pulses, it produces a signal which either blocks one flowmeter pulse or adds an additional pulse to the flowmeter pulses, in dependence on the polarity of the temperature difference.
The correction circuit also includes a power supply which continuously energizes only a first portion of the circuit, such first portion consuming a relatively small proportion of the power requirements of the circuit, and switching means connected to the power supply and responsive to flowmeter output pulses to energize the remainder of the circuit for a relatively short period, thereby to reduce the total power requirements of the circuit.
Also disclosed is a test circuit to cooperate with such a correction circuit including an oscillator for producing test pulses of predetermined frequency, a switch for applying the test pulses to the correction circuit instead of pulses produced by the flowmeter output, and a counter arranged to count the number of pulses between either two successive adding operations or two successive blocking operations.

REFERENCES:
patent: 3610898 (1971-10-01), Yamamoto et al.
patent: 3614892 (1971-10-01), Ottenstein
patent: 3688573 (1972-09-01), Garrett
patent: 3691838 (1972-09-01), Kalotay
patent: 3745827 (1973-07-01), Swanson
patent: 3823310 (1974-07-01), Kalotay et al.
patent: 3905229 (1975-09-01), Togo et al.
patent: 3978727 (1976-09-01), Griverus
patent: 4005603 (1977-02-01), Golahny et al.

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