SU1160554A1 - Frequency-to-voltage converter - Google Patents

Description

The invention relates to measuring equipment and can be used, called in the systems of automatic control and regulation.

. The aim of the invention is to improve the accuracy and the expansion of the range of convertible frequencies.

The drawing shows the functional diagram of the proposed Converter. ' ten

The converter contains a pulse former 1 connected to the converter input, a generator 2 of the reference frequency, a pulse counter 3 3 pulses, a register 4, a code-analog converter 5 connected in series. The output of the pulse former 1 is connected to the reset input of the 6 Tact counter, the counting input of which is connected to the output of the element OR 7, the first and second inputs of the latter are connected to the discriminator 8 zero and the comparator 9.

The output of the counter 3 pulses connected to the input of the discriminator 8 zero 25 and to the first input of the comparator 9, the second input of which is connected to the output of the register 4.

The frequency to voltage converter operates in the encoding mode of the duration of the period of the frequency to be converted into a binary code and in the conversion mode of the binary code of the duration of the period into a voltage.

The coding mode is characterized by the presence of zero signals at the first and second information outputs of the counter 6 cycles and the operation of the counter 3 pulses in the counting mode, and the conversion mode is characterized by the presence of single signals at the first or second information outputs of the counter 6 cycles and resetting the counter 3 pulses.

The Converter operates as follows.

With the arrival of the next impulse to the converter input, the former 1 generates a single signal to the counter reset input of 6 cycles, at the first information output ^:

which appears a single signal arriving at the control input of register 4 and producing a record of the binary code recorded in the counter of 3 pulses for the previous period of the frequency being converted.

From the output of register 4, the binary code is fed to the converter 5 of the code-, analogue and to the first input of the comparator 9, the second input of which receives the binary code & the output of the counter of 3 pulses. The comparator 9 performs the operation of controlling the entry in the register 4 of the binary code from the counter of 3 pulses. When the codes are equal at the inputs of the comparator 9, a signal is generated at its output, which through the element OR 7 goes to the signal input of the counter 6 cycles, at the second information output of which a single signal appears, which arrives at the reset input of the counter 3 pulses. The resetting of the pulse counter 3 is fixed by the discriminator 8 zero. At the output of the latter, a single signal is generated, arriving through the element OR 7 at the counting input of the counter of 6 cycles, which leads to the resetting of its first and second information outputs.

A single signal is taken from the counter zeroing input · 3 pulses and 'it starts counting pulses coming from the reference frequency generator 2 before the next pulse of the converted frequency arrives.

The presence in the frequency converter in the voltage of functional feedback on the execution allows you to increase the speed of its work to the limit values, limited only by the parametric speed of the applied integrated circuits.

Achieving such speed allows you to expand the range of ', the converted frequency and improve the accuracy of converting frequency to voltage in this range by 2-3 times.

The use of the proposed frequency to voltage converter in control systems provides an increase in the accuracy and quality of machining of parts on metal-cutting machines with numerical program control by eliminating machining errors arising during intense modes of machining parts characterized by high speeds of movement of the actuators of the machines.

1160554

entrance

For processing

Claims (1)

FREQUENCY CONVERTER IN VOLTAGE, containing a pulse shaper, whose input is connected to the converter input, a reference frequency generator, the output of which is connected to the counting input of a pulse counter, the register of which inputs are connected to the outputs of the count-; pulse, and the outputs - to the inputs of the converter code-analogue, about tl. contemplating that increasing the accuracy and expanding the range of convertible frequencies, a clock counter, an OR element, a zero discriminator, a comparator are entered into it, the counting clock counter input is connected to the output of the OR element, its zeroing input is connected to the output of the pulse shaper, the first information output is connected to the control input of the register and the second information output of the clock counter is connected to the input of the pulse counter reset, the first input of the comparator is connected to the output of the pulse counter, and the second input to the register output, the output of the comparator oedinen to the first input of the OR gate, the second input of which is connected to the output of zero discriminator whose input is connected to the output of the counter momentum <pulses. „ЗЦ,, 1160554 > 1 - 1160554 2