Frequency responsive circuit

Details Frequency responsive circuit Frequency responsive circuit

1974-11-27

1976-05-11

Shoop, William M.

321 1, 328138, 328133, H02M 522

Patent

active

039566854

ABSTRACT:
A capacitor of limited storage capacity is charged and discharged under control of a switching arrangement. The switching arrangement functions to connect the capacitor to a first steady current source of one polarity for a fixed first interval in each cycle of an input signal, and connects a second steady current source of opposite polarity to the capacitor for the remainder of the input signal cycle so that the voltage stored by the capacitor changes polarity when the frequency of the input signal traverses a threshold value. By shunting the capacitor with a fixed resistor, an output voltage linearly dependent on the input frequency can be obtained. By connecting the switching arrangement to connect the first current source to the capacitor for a fixed interval of time in each cycle of a first input signal, and to connect the second current source to the capacitor for a fixed interval of time in each cycle of a second input signal, a difference frequency discriminator function can be provided. Transistorized current sources and switching circuits, operated under control of a monostable multivibrator are described. The circuit may be used to control a change in the gas-air mixture strength fed to the combustion chamber of an internal combustion engine above a predetermined threshold engine speed.

REFERENCES:
patent: 3014169 (1961-12-01), MacIntyre
patent: 3166704 (1965-01-01), Jansons
patent: 3614581 (1971-10-01), Frost
patent: 3683270 (1972-08-01), Mattis
patent: 3727081 (1973-04-01), Davis et al.
patent: 3737754 (1973-06-01), Katz

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