SU1354127A1 - Capacitor charge frequency meter - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the voltage frequency of an industrial network and harmonic signals. The aim of the invention is to reduce power consumption. To achieve this goal, a ferroelastic vibrator 6, voltage regulator 7, three-pole switch 8 and storage capacitor 10 are additionally introduced into the capacitor frequency meter, and the first resistor 1, the first and second zener diodes 3 and 4, and the second resistor 2 are connected in series to form a limiter stabilizer 5. In addition, the frequency meter contains a measuring capacitor 9, measuring circuit 11 connected in parallel to capacitor 10. Circuit 11 fixes the average value of the discharge current, which is proportional to of the input frequency 2 yl. (L SO EL ISD Ri-1

Description

The invention relates to a measurement technique and can be used to measure the frequency of a voltage of an industrial network and harmonic signals.

The aim of the invention is to reduce power consumption.

Fig. 1 is a functional diagram of a capacitor frequency. The stabilization voltage is selected.

measure; FIG. 2 shows timing diagrams explaining his work.

The device contains the first and second resistors 1 and 2, the first and second zener diodes 3 and 4, forming a limiter-stabilizer 5, a ferroelastic vibrator 6, a voltage regulator 7, a three-pole switch 8, a measuring capacitor 9, a storage capacitor 10 and a measuring circuit 11 which is connected in parallel to the storage capacitor 10, the second plate of which is connected to the first fixed contact of the three-pole switch 8, and the first plate to the first plate of the measuring capacitor 9; common bus voltage regulator 7 and the second output of the stabilizer 5, the third output of which is connected to the second terminal of the ferroelastic vibrator 6, which controls the three-pole switch 8, and the first output to the first terminal of the ferroelastic vibrator 6 and the voltage regulator 7 , the output of which is connected to the second fixed contact of the three-pole switch 8, the movable contact of which is connected to the second plate of the measuring capacitor 9, while the stabilizer-stabilizer 5 consists of a first resistor connected in sequence 1, the first and second Zener diodes 3 and 4 and the second resistor 2, the input restrictor -stabilizer 5 are free terminals of the first and second resistors 1 and 2, the first output - the point connecting the first resistor 1. and the first Zener diode 3, the second output is the connection point of the first and second Zener diodes 3 and 4, the third output is the connection point of the second Zener diode 4 and the second resistor 2, the device works as follows

way ,,

one

At the input terminals of the limiter - stabilizer 5 (Fig, 1) serves ne15

20

equal to the response voltage of the sensing element of the ferroelastic vibrator 6, which controlled the three-pole switch 8 (Fig. 2c).

From the first and second outputs of the limiter stabilizer 5, positive unipolar pulses with frequency F follow to the inputs of the voltage stabilizer 7 (Fig. 2d),

8, the voltage stabilizer 7 is selected and set, for example, in the range from 3 to 15 V (FIG. 2d),

25 In the three-pole switch position 8 (FIG. 1), the measuring capacitor 9 is charged (FIG. 2e),

In the opposite position of the three

The 30 pole switch 8 transmits the electrical energy of the measuring capacitor 9 to the memory capacitor 10, if the capacitances of the measuring capacitor are equal

9 and a storage capacitor 10, half of the charge is transferred to the latter as a result of the arrival of charge Q

to a storage capacitor 10, the latter being charged as shown in Q, Fig 2;

The storage capacitor 10 is discharged through measuring circuit 1 during periodic operation of device 45, measuring circuit 11 records the average value of the discharge current of FIG. 2h, which is proportional to the frequency of the input signal.

35

50

55

Claims (1)

Invention Formula A capacitor frequency meter containing the first and second resistors, the first and second stabilizers connected in series, the measuring capacitor and the measuring circuit, characterized in that, in order to reduce the consumption A periodic signal (FIG. 2a), whose frequency is to be measured, From the first and third outputs of limiter-stabilizer 5, an amplitude-limited and stable-value voltage (FIG. 26) is fed to the first and second electrical inputs of the ferroelastic vibrator 6, five 0 equal to the response voltage of the sensitive element of the ferroelastic vibrator 6, which controls the three-pole switch 8 (Fig. 2c). From the first and second outputs of the limiter-stabilizer 5, positive unipolar pulses with a frequency F followed to the inputs of the voltage regulator 7 (Fig. 2d), 8, voltage stabilizer 7 is selected and set, for example, in the range from 3 to 15 V (FIG. 2d), 5 In the position of the three-pole switch 8 (FIG. 1), the measuring capacitor 9 is charged (FIG. 2e), In the opposite position of the three-pole switch 8, the electrical energy of the measuring capacitor 9 is transferred to the storage capacitor 10. If the capacitances of the measuring capacitor are equal 9 and the storage capacitor 10, half of the charge is transferred to the latter. As a result of the arrival of charge Q to a storage capacitor 10, the latter being charged as shown in Q, Fig 2; The storage capacitor 10 is discharged through the measuring circuit 11, during periodic operation of the device 5, the measuring circuit 11 fixes the average value of the discharge current of FIG. 2, which is proportional to the frequency of the input signal. five 50 55 Invention Formula A capacitor frequency meter containing the first and second resistors, the first and second stabilizers connected in series, the measuring capacitor and the measuring circuit, characterized in that, in order to reduce the consumption power, a ferroelastic vibrator, a voltage regulator, a three-pole switch and a storage capacitor, the first resistor connected in series, the first and second zener diodes and the second resistor are introduced in it, and the first and second inputs are free terminals of the first and the second resistor, the first output of the stabilizer limiter is the junction point of the first resistor and the first zener diode, the second output is the junction point of the first and second zener diodes a ,, third output - the second point of connection of the zener diode and the second resistor, the second a capacitor, a storage capacitor and a first input of the measuring circuit, the second input of which is connected to the second plate of the storage capacitor and the first fixed contact of a three-pole switch, the moving contact of which is connected to the second plate of the measuring capacitor, and the second fixed contact is connected to the output of a voltage regulator whose input is connected to the first terminal of a ferroelastic vibrator and the first 15 output of the limiter-stabilizer, the third output of which is connected a second terminal segnetoelastichnogo vibrator, one side of the sensing element which is fixed nepo10 the output of the stabilizer limiter is co-moving, and the other is mechanically connected to the common busbar of the stabilizer with a moving contact of a three-pole voltage, the first plates of the switch. 4127 a capacitor, a storage capacitor and the first input of the measuring circuit, the second input of which is connected to the second plate of the storage capacitor and the first fixed contact of the three-pole switch, the moving contact of which is connected to the second plate of the measuring capacitor, and the second fixed contact is connected to the output-. voltage regulator house, the input of which is connected to the first terminal of the ferroelastic vibrator and the first 15 output of the limiter stabilizer, the third output of which is connected to the second terminal of the ferroelastic vibrator, one side of the sensitive element of which is not fixed  I if v, and.  ft t