SU1206858A1 - Frequency relay - Google Patents

Description

The invention relates to electrical engineering and is intended for use in telecontrol devices, remote signaling, telemetry and information transmission systems.

The aim of the invention is to improve the accuracy of selection and speed.

FIG. 1 is a block diagram of a frequency relay; FIG. 2 shows an example of implementation of the analog memory block in FIG. 3 - timing charts of the frequency relay.

The frequency relay contains a limiter amplifier 1, a Schmitt trigger 2, a key 3, a generator of 4 stable frequency pulses, a counting unit 5, a comparison unit 6, a setpoint code setting unit 7, an analog memory block 8 and an output amplifier unit 9.

The input of the amplifier limiter 1 is the output of the frequency relay, the output of the amplifier limiter 1 is connected via the Schmitt trigger 2 to the first input of the key 3, to the second input of which a generator of 4 stable frequency pulses is connected, the output of the key 3 is connected to the counting input of the counting unit 5, the outputs the counting unit 5 and the setting code setting unit 7 are connected respectively to the first and second inputs of the comparison unit 6, the output of which is connected to the information input of the analog memory block 8, the control input block of the analog memory 8 is connected to the trigger output Schmitt 2, the control output of the analog memory block 8 is connected to the reset input of the counting unit, and the information output of the analog memory block 8 is connected to the input of the output amplifier block 9, the outputs of which are the outputs of the frequency relay.

An analog memory block 8 (FIG. 2) contains an AND element 10, the first input of which is the information input of the analog memory block 8, the first element NO 11, the input of which is the control input of the analog memory block 8 and the output connected to the second input element and 10.

The output of the And 10 element is through a diode 12 connected to the input of the second element NO 13, the output of which is the information output of the analog memory block 8. The first capacitor 14 and the first resistor 15 are connected to the input of the second element HE 13.

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The output element And 10 through the second resistor 16, the third and fourth elements are NOT 17 and 18 and the second capacitor 19 is connected to the control

5 output of an analog memory block 8 and a third resistor 20. A third capacitor 21 is connected to the third element HE 17.

Fig, 3 presents temporary

1-0. Diagrams of operation of the frequency relay, where 22 is the voltage at its input 23-29, voltage respectively at the Schmitt trigger 2 input, the first input of the key 3, the counting input of the counting unit 5,

 5 in the comparison block 6, the information output of the analog memory block 8, the outputs of the output amplifiers block 9 and the control output of the analog memory block 8.

20 Frequency relay operates as follows.

In the initial state, when no signal arrives at the input of the frequency relay, t, e, there is no signal at the input of the amplifier 5 of the shortener 1, then the signal does not arrive at the input of the Schmitt trigger 2. Since the output of the Schmitt trigger 2 is connected to the first input of the key 3, then

The 30 key will turn out to be locked. At the same time, the 4-frequency stable frequency pulse generator works and the second input of the key 3 receives impulses of a specified frequency. Since in the absence of a signal at its first input the key 3 will be closed, the signal also does not come to the input of the counting unit 5, therefore, it does not go to the first input either.

40 of the comparison block 6, the signal from the output of the counting block 5 is not received. The second input of block 6 of the comparison from the output of block 7 of the code is given a signal in the form of codes given

45 grid frequency elect frequency relay. But since the output of the counting unit 5 is set to zero, there is no signal at the output of the comparison unit 6, there is no signal at the information

to the input of block 5 of analog memory, which is connected to the output of block 6 of comparison, leads to the absence of a signal at the information output of block 8 of analog memory, as well as

55 and at the outputs of the block amps amplifier.

When a signal, for example, of a sinusoidal form, arrives at the input of the amplifier-limiter 1, this signal will be brought to the specified amplitude of the output signal, i.e. depending on the amplitude of the input signal, it is either amplified or weakened. A level driven signal from the output of amplifier limiter 1 is fed to the input of a Schmitt trigger 2, where it is converted from a sinusoidal to a square one of the same frequency as the original signal. The leading edge of the rectangular signal is the open key 3 and the counting input of the counting unit 5 from

generator 4 begins to receive rectangular pulses of a given frequency. These pulses are counted in the counting block until the moment key 3 is closed, i.e. until the moment when the rectangular impulse ends at the first input of the key 3. The impulses in the counting unit 5 can be counted in both binary and binary-ten codes. From the output of block 5, the signal in the form of a code defining the number of pulses arriving at the input is fed to the input of block 6, to the other input of which from block 7 specifying the code the codes of frequencies specified for selection are received. If the code received in block 6 of comparison with block 5 of the account does not coincide with any of the tasks specified in block 7

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codes, the output state of the comparison unit 6, the analog memory block 8 and the output amplifier unit 9 are similar to the initial one, i.e.

5 is unchanged. If the code received in block 6 of the comparison coincides with one of the codes specified in block 7, the code, then a signal appears at the output of block 6 of the comparison.

10 On the falling edge of the signal at the output of the Schmitt trigger 2, the capacitor 14 of the analog memory block receives a signal from the comparison block 6. This signal is remembered for a given

15 time, one or several periods of the input signal, depending on the nature of further processing and the required speed. From the output of block 8 analog signal memory

20 is fed to the input unit 9 output amplifiers. The signal amplified in block 9 of the output amplifiers appears at the output of the frequency relay. With some slowdown relative to the back of the 25 pulse at the output of the Schmitt trigger 2, the analog memory block 8 generates a reset pulse of the counting block 5.

The use of the proposed frequency relay in remote control systems makes it possible to obtain frequency settings in a single relay over the whole range of frequencies used and to achieve higher selectivity and speed.

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Compiled by E. Pantelkin Editor G. Volkova Tehred O. Nece Corrector G. Reshetnik

8723/54

. Circulation 644Subscribe

VNIIPI USSR State Committee

for inventions and discoveries I 3035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

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Claims (1)

A FREQUENCY RELAY containing a pulse shaper, a stable frequency pulse generator, a key and a counting unit, characterized in that, in order to increase the selection accuracy and speed, a setting code setting block, a comparison block, an analog memory block and an output block are introduced into it Walk --------- E; driving amplifiers, and the pulse shaper consists of a limiter amplifier and Schmitt trigger, while the input of the limiter amplifier is the input of the frequency relay, the output of the limiter amplifier through the Schmitt trigger is connected to the first input of the switch, the second input of which is connected to a stable frequency pulse generator, the output the key is connected to the counting input of the counting unit, the outputs of the counting unit and the setting code setting block are connected respectively to the first and second inputs of the comparison block, the output of which is connected to the information input of the unit and an analog memory, the analog control input of the storage unit connected to the output of the Schmitt trigger, the analog control output of the storage unit is coupled to the reset input counting unit, and information output analog memory unit is connected to the input of the output amplifiers whose outputs are the outputs of the frequency relay. SU .. „1206858