SU1285520A1 - Information board - Google Patents

Abstract

The invention relates to visual information tools and can be used to display educational information. The purpose of the invention is to improve the reliability of the scoreboard, which is achieved by introducing a switch and connections, which allow to eliminate the effect of a false trigger due to contact bounce. The display board contains display units, each of which consists of a control element 4, connected slightly to power buses 2, 3 and a light source b, switching unit 8, the movable contact of which is made in the form of a conductive pointer 9 connected to switch 11, and the fixed contacts are made in the form of conductive plates 10 connected to the inputs of the control elements 4. In this case, the control element may contain a thyristor and a zener diode with corresponding connections, or a dynistor and a diode with corresponding connections. 2 hp ff, 3 ill. W

Description

Yu

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The invention relates to visual information tools and can be used to display educational information.

The aim of the invention is to improve the reliability of the scoreboard.

FIG. 1 shows the principle of the scoreboard; Fig. 2 is a diagram of a board with a thyristor-based control element; in fig. 3 - the same with the control element on the basis of the dinistor.

The information board contains the display unit 1, the first 2 and second 3 power buses, the control element 4, the matching element 5, the light source 6 made in the form of a resistor, the load element 7, made in the form of a resistor, the switching unit 8, the movable contact of which is it is a conductive pointer 9, and the fixed contacts are conductive plate 10, switch 11, thyristor 12, zener diode 13, diode 14, diistor 15 and the third power bus 16.

The device works as follows. .

Due to the absence of the control switching potential on the conductive plates 10 at the corresponding input of the node 1, after the power is supplied, the control elements 4 remain in the off state and the sources are extinguished.

When touched with a pointer 9 to the conductive plate 10 of the selected display unit 1 at the input control P855202

Zener diode 13 and diode 14 with a small direct voltage drop.

Due to the presence in the circuit of the control electrode of the thyristor 12 of the subtractive 5 Zener diode 13, the current in the circuit does not reach the minimum control turn-on current and after supplying the supply voltage to buses 2 and 3, the thyristor 12 remains in the fO off state.

When touched by the pointer 9 to the plate 10, the zener diode 13 opens and the load element 7 provides the control electrode current sufficient to turn on the thyristor 12.

The diode 14 prevents the flow of the control input current of the control element 4 to the power circuit of the thyristor 12.

20 . To turn off the control element 4, it is necessary to switch the switch 11 and touch the plate 10 with the pointer 9 to do this. When this happens, the switched thyristor 12 is bypassed by the direct voltage of the diode 14, the cathode current of the thyristor 12 becomes less than the holding current, and it turns off. After disconnecting the pointer 9 and the plate 10, the light source 6 goes out.

Managed element 4 can be implemented (Fig. 3) on dynistor 15 and diode 14.

Since the supply voltage on buses 2 and 3 is chosen below the turn-on voltage of the dynistor 15, after it is supplied, the dynistor 15 remains in the off state.

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When the pointer 9 touches the 40 plate 10, the potential of the third power supply bus 16, which exceeds the turn-on voltage of the dynistor 15, turns on the latter, while the diode 14 prevents the flow of reverse current through the matching element 5 and the light source 6, which lights up after the pointer is disconnected 9 and plates 10, since the dynistor 15 remains switched on-H1M after they are disconnected.

A connecting element 4 appears on the bus 2 circuit - element 7 - switch 11 - pointer 9 - plate 10, which sets it to the on state and light source 6 lights up.

To turn off the selected information element, switch 11 should be switched and a pointer 9 should be touched to plate 10. At the input of element 4, a signal appears to switch off the gshastin circuit 10 - pointer 9 - switch 11 - bus 3, which returns control element 4 in the initial state, and the light source 6 goes out.

The control element 4, potentially controlled by one input, can be realized (Fig. 2) on the unlocked thyristor 12, subtracting When the pointer 9 touches the plate 10, the potential of the third power supply bus 16, which exceeds the turn-on voltage of the dynistor 15, includes the latter, while the diode 14 prevents the flow of reverse current through the matching element 5 and the light source 6, which lights up after disconnecting the pointer 9 and the plate 10, since the distor 15 remains switched on after it is disconnected.

In order to disconnect the control element 4, it is necessary to switch the switch 11 and touch the plastic pointer 10 with the pointer 9. In this case, the switched on dynistor 15 is shunted, the current through it becomes less than the holding current, and it is turned off. After disconnecting the pointer 9 and the plate 10, the light source 6 goes out.

Claims (2)

1. Information board containing display units, each of which consists of a control element, the first output of which is connected through a matching element to a light source, the second output of the control element is connected to the first power bus, a load element, one of the terminals of which is connected to the second power bus, and the switching node, the movable contact of which is made in the form of a conductive pointer, and the fixed contacts are made in the form of conductive plates connected to the inputs of the control elements. in that, in order to increase the reliability of panels, it comprises a switch, one of the terminals of which is connected to the other terminal of the load element, the other terminal  The switch is connected to the first power bus, and the common pin is connected to the current pointer. 2. The panel according to claim 1, wherein the control element comprises a thyristor, the control electrode of which is connected to the anode of the zener diode, the cathode of which is the input of the element connected to the cathode of the diode, the anode of which is the first output of the element and is connected to the anode of the thyristor, the cathode of which is the second output of the element. 3ri Tablo according to claim 1, wherein the control element contains a dynistor, the anode of which is the input of the element and is connected to the cathode of the diode, the anode of which is the first output of the element, the second output which is the cathode of the dynistor. - eleven 2 ABOUT Yu ////// 7 2SI73 2 J o F "/ g.2 t 71 .З ABOUT ten //////// Л -about