Voltage-to-frequency squared circuit

Details Voltage-to-frequency squared circuit Voltage-to-frequency squared circuit

1989-03-31

1991-05-28

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

307271, 361 86, 361 88, H02H 326

Patent

active

050199366

ABSTRACT:
A voltage-to-frequency converter is provided for generating a frequency which is proportional to the square of the input voltage provided to the converter. Since the input voltage is correlative to current flowing in a conductor, the output frequency exhibits a proportionality similar to the relationship between the temperature of the conductor and the current flowing in it. The arrangement includes two charging circuits which receive the input voltage and are alternately charged as a function of the input voltage. While the first charging circuit charges to a predetermined voltage, the second charging circuit discharges. Upon exceeding the predetermined voltage, the output of a flip flop is set to discharge the first charging circuit, and to charge the second charging circuit. When the second charging circuit charges to a predetermined voltage, the output of the flip flop is reset, so that the first charging circuit charges again. As the input voltage rises, the charging time for each circuit decreases, thus causing the output of the flip flop to switch at a higher frequency. In effect, the frequency of the output of the flip flop changes at a rate proportional to the square of the input voltage.

REFERENCES:
patent: 4005283 (1977-01-01), Rhodes
patent: 4259706 (1981-03-01), Zocholl
patent: 4513342 (1985-04-01), Rocha
patent: 4782422 (1988-11-01), Jones et al.

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