Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1985-06-27
1987-03-17
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307479, 307270, 328127, 328115, 328118, 340347NT, H03K 1302, H03L 700
Patent
active
046510273
ABSTRACT:
An analog current-to-frequency converter which produces output pulses whose repetition rate depends on the current value. Included in the converter is an operational amplifier having an inverting input to which is applied a negative input voltage whose magnitude is proportional to the current value. The amplifier functions as an integrator which yields a positive output only when the voltage at its inverting input is negative. The integrator output is so coupled to the input of a one-shot as to cause the one-shot to generate an output pulse each time the integrator output crosses over from negative to positive. A NOR gate coupled to the one-shot acts to activate a switch only when the integrator output goes positive, the activated switch applying a positive reference voltage to the inverting input of the integrator through a balance resistor, thereby initiating a swing from negative to positive until a point is reached at which the integrator output goes from positive to negative. At this point the switch is deactivated to remove the positive reference voltage, the integrator output again going positive as a result of which the one-shot generates another pulse. Thus the integrator output in response to the applied negative input voltage oscillates from positive to negative to cause the one-shot controlled thereby to generate output pulses whose repetition rate is proportional to the value of the current being converted.
REFERENCES:
patent: 4109168 (1978-08-01), Raymond
patent: 4507624 (1985-03-01), Ley et al.
Ebert Michael
Fischer & Porter Company
Miller Stanley D.
Roseen Richard
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