Line frequency slaved voltage-to-frequency converter system

Details Line frequency slaved voltage-to-frequency converter system Line frequency slaved voltage-to-frequency converter system

1987-11-12

1989-09-19

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

356226, 324322, H03M 160

Patent

active

048685739

ABSTRACT:
The system includes a synchronous voltage-to-frequency converter connected to receive an analog input signal voltage and to generate a train of output pulses. A counter is connected to receive and count the output pulses and a digital register is connected to the counter for periodically receiving and storing the count in the counter. A conversion interval timer circuit is connected to control the operation of the counter and the register to determine a conversion interval during which the output pulses from the synchronous voltage-to-frequency converter are accumulated in the counter and then stored in the register. The conversion interval timer circuit is operable to determine the end of a prior conversion interval and the beginning of a new conversion interval in response to a predetermined phase of a predetermined cycle of the ac power line voltage. A timer is provided for exact measurement of the duration of each conversion interval and a multiplier is provided for multiplying the number stored in the register by a function which is a reciprocal of the exact duration measurement from the timer to thereby contact the number for variations in the conversion interval.

REFERENCES:
patent: 4201472 (1980-05-01), Maeda
patent: 4412744 (1983-11-01), Lee et al.
patent: 4435697 (1984-03-01), Takahashi
patent: 4644323 (1987-02-01), Chamran et al.
"Synchronized Voltage-to-Frequency Converter", by Burr-Brown.
"Monolithic Synchronous Voltage-to-Frequency Converter", by Analog Devices.
"Clocked V-F Converter Tightens Accuracy and Raises Stability", by Burr-Brown.

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