SU1483626A1 - Device for futomatic disconnection of radio equipment - Google Patents

Abstract

The invention relates to a pulse technique and can be used in devices for the automatic shutdown of radio engineering devices having a linear output. The purpose of the invention is to increase reliability and sensitivity. The device for automatic shutdown of radio equipment contains buses 1, 2 alternating voltage sources, input buses 3, 4 sources 5 DC voltage, control key 6, ADC 7, ROM 8, register 9, output buses 10 source 5, frequency divider 11 , clock generator 12, adder 13, relay 14, through closing contacts 15 and 16 of which bus 1 and 2 can be connected to buses 17 and 18 of radio equipment power (MOUTH), control bus 19, polling counter 20, closing contacts of button 21, multiplier voltages 22 and logic elements are NOT 23, AND-NOT 24, NOT-OR 25, NOT 26 and 27. Eliminating the deadband when comparing signals comparable to each other eliminates accidental operation of the ADC when the input voltage is located at the boundary of the quantization zones. 1 il.

Description

The invention relates to a pulse technique, in particular to an electronic switching technique, and can be used in devices for automatically turning off televisions, tape recorders and other radio engineering devices (MOUTH) having a linear output.

The purpose of the invention is to increase reliability and sensitivity.

The drawing shows a functional block diagram of the proposed device.

The device contains buses 1 and 2 of the alternating voltage source, input buses 3 and 4 of the source 5 of constant voltage, control key 6, analog-to-digital converter (ADC) 7, permanent memory (ROM) 8, register 9, output bus 10 source 5 DC voltage, frequency divider 11, its input connected to the output of the clock generator 22, the adder 13, the winding of the relay 14, through the closing contacts 15 and 16 of which bus 1 and 2 and

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The alternating voltage point can be connected to the buses 17 and 18 of the power supply of the radio equipment of the MOUTH, the control bus 19, the interrogation counter 20, the closing contacts of the button 21, the voltage multiplier 22 and the logic elements NOT 23, NON 24, NOT OR 25 , NOT 26 and 27.

The output of the frequency divider 11 is connected to the synchronization input of the polling register 9 and the input of the logical element IS-NOT 24, the other input of which is connected to one output of the adder

13, its other output through sequentially connected logical elements is NOT-OR 25 and NOT 27 is connected

to the reset input of the poll counter 20. The outputs of the ADC 7 are connected to the address inputs of the lower bits of the ROM 8 and the first inputs of the adder 13.

The principle of operation is based on the disconnection of the mains voltage from a radio engineering device in the absence of a signal at its linear output.

When the constant voltage button 21 is pressed, the output buses 10 of the constant voltage source 5 are supplied to the control key 6, which commutes the power supply to the relay coil

14. The contacts 15 and 16 of the latter connect the MOUTH to the buses 17 and 18 of the alternating voltage source, at the same time the contact 16 blocks the contacts of the button 21. During the warm-up period of the MOUTH (about 1 min), the clock generator 12 operates, the pulses from which through, the frequency divider 11 on logic elements, the adder 13 and the counter 20 of the survey. The disconnection of the MOUTH from the network does not occur due to the absence of a signal at the output of the polling counter 20.

After warming up, the signal from the linear output of the MOUTH comes to the bus 19 and the voltage multiplier 22, the constant component of which goes to the ADC 7, from the output of which to the lower bits of the address input of the ROM 8, in which a certain code is preliminarily flashed. Register 9 receives information from the output of ROM 8 and loaded through the element NOT 23 to the higher address bits of ROM 8 forms a circuit for eliminating accidental operation of the A / D converter 7, if the constant component is located at the boundary of one of the four ADC quantization zones 7.

The interrogation of the state of the circuit occurs with the frequency specified by the clock generator 12 and the divider frequency 11. The frequency of the clock generator 12 is selected from the condition of the implementation of 16 polls for 180 s. In case of coincidence of the current code from the output of the A / D converter 7 and the code of the accident prevention circuit detected by the adder 13, the polling pulse through the logic elements is NOT-OR 25, NOT 27 is fed to the reset input of the poll counter 20. If the signal level at the output of the ADC 7 does not change in 16 polling pulses, then the telecentre does not work. In this case, a logical 1 signal appears at the reset input of the interrogation counter 20, a logical O signal appears at the output, and a key 6 is opened through the logical element NOT 26, which causes the relay 14 and, accordingly, the MOUTH to disconnect from the mains. Disconnection occurs within no more than 180 s after the end of the broadcast on the received channel of the TV. To re-enable it in the network, it is necessary to press the button 21. When the telecentre is operating, the AND-24 logic element supports the poll counter 20 in the counting mode and the MOUTH remains under network voltage during the operation of the transmitting center.

Special attention should be paid to the operation of the ADC 7 deactivation scheme in the case of a constant component voltage at the boundary of one of the four working quantization zones of the ADC 7. Random operation may occur as a result of referring the value of the measured value to the nearest value of the same measured value in the quantization process.

Claims (1)

Compared with the prototype, the proposed device eliminates the dead zone when comparing the signals comparable to each other and improves the reliability of the device. In addition, in the proposed device, the accidental operation of the ADC is eliminated if the input voltage is located at the boundary of the quantization zones. Invention Formula A device for automatic shutdown of radio equipment containing a controllable key, the power terminals of which are connected in series with a relay winding and output buses of a constant voltage source, the first input bus of which is connected to the first power supply bus of the radio equipment and through the first pair of relay contacts, which are shunted by the closing contacts of the button, connected to the first bus of the source of alternating voltage, the second bus of which is connected to the second input bus of the source of constant voltage and through the second pair of relay contact closures. With a second bus power supply to the radio equipment, and a control bus, characterized in that, in order to increase reliability and sensitivity, a voltage multiplier, analogue-to-digital converter, read-only memory, register, clock generator, frequency divider, adder, polling counter, three logical elements NOT, logical elements NAND, NOT-OR, and the input of the voltage multiplier is connected to the bus control, output - with the input of an analog-digital converter, the outputs of which are connected to the address inputs of the lower bits of the permanent storage device and the first inputs of the adder, the output of which through serially connected logical elements is NOT-OR, is not connected to the reset input of the poll counter, the transfer output of the adder is connected to one input of the NAND logic element, the other one whose input is connected to the output of a frequency divider, the input of which is connected to the output of a clock generator a, to the output of a frequency divider under The register polling synchronization input is turned on, the output of the NAND logic element is connected to the counting input of the polling counter, the output of which is NOT connected to the input of the controlled key via the second logic element, the Permanent storage device outputs are not connected to the most significant bits via the register and the third element. this storage device and the second inputs of the adder.  BUT 1KV.P1b. “L. nineteen 18 HI 21