SU1709512A2 - Automatic switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in devices for automatically turning off the TV both at the end of the TV program on this channel, and in disrupting synchronization due to malfunctions in the radio channel of the TV and in case of malfunctions in the horizontal scan or the horizontal power supply source. The purpose of the invention is to expand the functionality, for which an element 2117 is introduced into the device. The device contains a resistor 2, an oscillating circuit 3, a diode 8. buttons 9, 23, time specifying an RC circuit 10, transistors 115, 17, a resistor voltage divider 14, a relay coil 18 with closing contacts 19, 20, a discharge resistor 21, source 22 voltage. 1 il.

Description

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The invention relates to a pulse technique and can be used in automatic TV turn-off devices both at the end of a TV program on a given channel, and in the event of a synchronization failure due to malfunctions in the TV channel, and in case of malfunctions in a horizontal scan or a horizontal power supply. , and is an improvement on the famous author. St. No. 945994.

A circuit breaker is known, comprising a series-connected control bus, a resistor, a parallel oscillating circuit, an isolation diode, an RC circuit, a field-effect transistor, a voltage divider, a bipolar transistor, a relay coil, a voltage source, the first button. The second button is connected in parallel to the input of the field-effect transistor. The first terminals of the closing contacts of the relay are connected to the voltage source and output buses, and the second terminals of the contacts are connected to the buses of the voltage source.

At the end of the TV program on this channel, the flow of the control signal stops, the transistors are closed, which causes the relay and the TV to turn off.

A disadvantage of the known automatic switch is the limited functionality, since the known device does not provide for switching off TV sets in the event of faults in the radio channel causing synchronization problems and faults in the horizontal scan or its power source leading to the disappearance of the horizontal sweep pulse.

The purpose of the invention is to enhance the functionality of the device by ensuring that TVs are triggered and disconnected when a radio channel fails, resulting in synchronization failure, and line scan errors or its power source, leading to the disappearance of line flyback. Target achieved by the fact that a circuit breaker containing a voltage source, a signal converter into a harmonic voltage, a KS circuit, a transistor whose collector through the winding of the executive relay is connected to the positive, and the emitter to the negative bus of the voltage source, the first conclusions of the closing contacts of the executive

the relays are connected to a voltage source and output buses, and the second terminals are connected to alternating voltage source buses, a diode, a resistor,

a field-effect transistor and a resistive voltage divider, the output of the signal converter to harmonic voltage is connected via a diode to a common RC circuit terminal and a gate of a field-effect transistor, the drain of which and the other capacitor of the RC circuit are connected to the positive voltage source bus and the other terminal the resistor of the RC circuit and the source of the field-effect transistor are connected via a resistive divider to the negative voltage source bus, and the middle point of the resistive divider is connected to the base of the transistor, while And the negative voltages of the voltage source are shunted by a resistor, in addition, the cathode of the diode and the negative voltage of the voltage source are connected to additional buses. In addition, the signal to harmonic voltage converter is made in the form of a parallel oscillating circuit consisting of a first and second capacitors and an inductance coil, with a common capacitor terminal connected to the control bus, another terminal of the first capacitor and an inductor terminal circuit, and other terminals of the second capacitor and inductance coil with

5 a negative bus voltage source, introduced a logical element 2I, connected in series between the parallel oscillating circuit and the separation diode.

0 A positive effect in the implementation of the proposed technical solution in the TV is to expand the functionality of the circuit breaker by

5 to ensure the activation and shutdown of televisions in the event of faults in the radio channel, leading to a breakdown of synchronization, and malfunctions in the horizontal scan or its power source, leading to the disappearance of the horizontal flyback pulses.

The drawing shows the scheme of the proposed automatic switch. The proposed circuit breaker contains the first control bus 1, a resistor 2, a parallel oscillating circuit 3, containing capacitors 4, 5 and an inductor b, a logic element 2 And 7, a separation diode 8, the first button 9, the time setting

RC circuit 10 containing a resistor 11 and a capacitor 12, a field-effect transistor 13, a resistive divider 14, voltage across resistors 15, 16, a bipolar transistor i, a winding of a relay 18c with closing contacts 19, 20, a discharge resistor 21, a source 22 second button 23.

Logic element 7 has a first input 24 and a second input 25 connected to the second control bus 26.

The voltage source 22 may include, for example, a step-down transformer, a rectifier, a smoothing filter and a voltage regulator or a network rectifier, a pulse voltage converter containing an isolation transformer, a secondary voltage rectifier and a smoothing filter.

The circuit breaker operates as follows.

The device is turned on by briefly (approximately 1 sec) pressing buttons 23, which blocking the closure contacts 19 and 20 of relay 18. The resulting DC voltage of the source of the automatic switch 22 is also applied to the time of the RC circuit 10, causing the charging process capacitor 12 through a high-resistance resistor 11, which creates a voltage drop proportional to the charging current of the capacitor 12. This positive-polarity voltage is applied to the gate of the field-effect transistor 13 and its source through zistors 15, 16, fully compensating the automatic bias voltage that is locking it; formed on the resistors 15, 16 connected to the source circuit of the field-effect transistor 13. From the midpoint of the resistive divider 14 is removed more closely, it is necessary to create an operating mode close to the saturation mode — the output current of the transistor 17. This current flows through the relay coil 18, it triggers and closes contacts 19, 20. This state of the relay is unstable. As the capacitor 12 charges, the voltage on its plates increases and the charge current decreases, which in turn leads to a decrease in the output currents of the transistor 13 and transistor 17, in the circuit of the collector of which the winding 18 is turned on.

The constant time of the charge circuit of the capacitor 12, taking into account the value of the DC voltage of source 22 and the current level of the relay 18 to turn off, is in the order of two minutes, and before the relay 18 to turn off, the horizontal sync pulses appear on the first control bus 1 and the pulse signal of the inverse phase stroke scan on the second control bus 26, which is fed to the second input 25 5 of the logic element 7.

The signal of horizontal sync pulses from the first control bus 1, through the resistor 2 to the oscillating circuit 3, is converted to harmonic in the latter,

0 the signal, whose positive half-wave is in phase with incoming sync pulses, is fed to the second input 24 of logic element 7.

Since during operation of the TV during

5 of the reception of the tele-transmission, the horizontal retracement pulses are generated in phase with the incoming clock pulses, 1 are fed to both inputs of the 2I 7 logic element simultaneously. This results

0 to the appearance at the output of the logic element 7 logical 1. The periodic sequence of the appearance at the output of the logic element 7 is detected by a diode 8 and is integrated by a capacitor 12

5 in the input circuit of the field-effect transistor 13, the drain of which is connected to the source bus

22 voltages The transistor 13 is open all the time of the synchronous action of the horizontal sync pulses and reverse pulses

0 horizontal sweep on control buses 1 and 26, providing an open state of TRZ; istor 17, in the collector circuit of which relb 18 is included, since the base of transistor 17 is connected to the midpoint

5 is a voltage divider 14 connected to the source circuit of the transistor 17.

G1ri O-the presence of a periodic sequence at the output of the logic element 7 1, i.e. stock oh closes

0 diode 8, capacitor 13 begins to slowly discharge through resistor 11, which slowly reduces the voltage drop levels at divider 14, base of transistor 17 and the output current of transistor 17, and at some point in time (i.e. after 1-2 min since the discontinuity of the logic element of a periodic pulse sequence, i.e., 1) the magnetic force of the cortex of the relay 18 is insufficient, the relay 18 is activated by opening the contacts 19 and 20 and the automatic shutdown device is de-energized. The capacitor 12 is quickly discharged through the open diode 8, the output

5 of the logic element 7 and the discharge resistor 11.

When the program of the TV program ends on this channel or when there are malfunctions in the radio channel scheme of the TV, the supply of clock pulses to

the first control bus 1, as a result of which, at the first input 24 of the logic element 7, O is also set to O, and, as a result, the automatic shutdown device is de-energized.

If malfunctions occur in the master oscillator and in the horizontal output stage of the television or horizontal power source, with one to the disappearance of the horizontal reverse scan pulses, O is set to the second input 25 of the logic element 7, O is also output, and as a result , the automatic shutdown device de-energizes.

If malfunctions occur in the horizontal scanning generator, which result in a synchronization failure, the first input 24 and the second input 25 of the logic element 7 receive impulses out of phase, as a result of which the output of the logic element 7 is set to O and, as a result, the automatic shutdown device de-energizes.

The circuit breaker is ready for the next power up. Networking processes are repeated again. The device is turned off during operation by briefly pressing the button 9, while the gate of the field-effect transistor 13 is connected to the negative bus of the voltage source 22, the currents through the transistors 13 and 17 are reduced and the relay 18 triggers on the rdsm contact 19 and 20, resulting in Disconnects from the AC mains.

Technical and economic effect of the application of the proposed automatic shutdown compared to the prototype

is to expand the functionality of the circuit breaker by activating the device and turning off the TV not only at the end of the telecast on this channel, as well as when there are malfunctions in the horizontal scan, in the horizontal power source and in the TV channel, leading to sync violation, loss of clock pulses , pulse reverse flyback tv.

In addition, the use of the proposed device provides increased

reliability and safety of operation of the TV due to the timely shutdown of the latter due to the exclusion of exceeding the electrical modes of the TV elements, including the ignition of the TVs in the event of faults in it; simplifies the circuit and reduces the dimensions of television sets due to the absence of the need to construct protection circuits that are more complex,

than the proposed device (for example, a breaker between the output horizontal transformer and a voltage multiplier, which has mechanical elements in its composition) with smaller

functional capabilities gh.

Claims (1)

Formula of the invention Automatic switch St. Fvfe 945994, I also differ in the fact that. in order to expand its functionality, a logical element 2I is introduced into it, with the oscillating circuit connected to the anode of the isolation diode via element 2I, the second input of which is connected to the second control bus.