SU1234961A1 - Optronic selector switch - Google Patents

Abstract

This invention relates to the field of digital technical telephones. It can be used in logical. X elements, switch. X, trigger. X, encoders. The purpose of the invention is to increase the speed by introducing a 1Я 9 voltage to current switch with an optical switch with a sin- ingly incompetent .1I11c11noy transfer character and CTHKOI I, KOH; -i.eiicaTopa 10 and a resistor 11. The device also contains a LED 1, optically coupled to photodiode 2, input 3, DC voltage sources 4 and 12, output l (mtr01ppzi switch 5, zero potential 6, inrush 7, output 8. In the description of the invention, a conversion circuit is applied. 1 9. V1zp olnennogo on bipolar transistors. 1 Cp f-crystals, 2 ill. (L yo about QO O) Fig .;

Description

The invention of pkkchy c to digital optoelectronic and can be neiio.ibzovano in logical e-lmeite, switches, tripers. coding device;

The aim of the invention is to improve speed.

In Fig. 1, an 11th representation: 1 is a diagram of a ripe; i,; iarae optoelectronic switch.

The input diode optocount contains a LED 1, optically coupled to a photodiode 2. The control of the diode 1 ocyne is connected to its input 3, the photodiode 2 is shifted in the opposite direction by the source 4 of a constant positive voltage. The output electronic switch 5, connected to the zero potential type 6, is controlled by input 7 and generates an output signal at output 8. The device has a voltage converter 9 injected into current with a palipinal transfer characteristic, a capacitor 10 and a resistor 11. The non-inverting input of converter 9 is connected with the second source 12 of constant positive voltage.

The electro-electrical switch operates in the following manner.

In the absence of a control signal at the input 3, the LED 1 is not excited, the photodiode 2 is not illuminated and does not create a noticeable photobutton, the output electronic switch. 5 is turned off. The inverting input potential of converter 9, which is determined by the voltage drop in the input circuit of switch 5 and on resistor 11, is close to zero and below the potential of the non-inverting input current, and converter 9 (in this mode, converter 9 does not produce a noticeable output current).

When the control signal is applied to the input 3 and the LED 1 is energized, the illuminated photodiode 2 creates a photocurrent flowing through a parallel-connected capacitor 10 and a resistor 11 into the input circuit of the switch o. The process of turning on this switch begins. During the process, the input potential of the switch 5 increases (at the input), in addition, as the capacitor 10 charges, the voltage drop across the resistor 11 increases. As soon as the power of the inverter and non-inverting inputs equalize, the converter 9 generates a significant current in the output circuit. and thereby abruptly stops the photocurrent from being taken into the input circuit of the switch 5. The converter 9 performs the functions of conducting the first element with a well-defined threshold properties.

The process of inverting the voltage at the inverting input of converter 9 summarizes a number of factors acting in a specific sequence. At first, the potential difference across the capacitor plates K) does not change and the increase in voltage on the inverting inverter converts 9 to reflect the process of increasing the voltage on input 7, i.e. the process and fact of the coupling of element 5.

The rate of change of voltage on the plates of the capacitor 10 is proportional to the level of the photocurrent 1f. The capacitance of the capacitor 10 is chosen so that the voltage at the inverting input of the converter 9 reaches a threshold value as soon as the output potential of the device (at output 8) changes to a new logical value.

 level (in the enabled state). As a converter 9 (Fig. 1), it is advisable to use two bipolar transistors connected according to the Darlington scheme. The scheme proposed optoelectronic. A switch with such a converter is shown in FIG. The converter 9 (FIG. 1) is made on bipolar transistors 13 and 14 (FIG. 2).

The proposed optoelectronic switch (figure 2) operates as follows 30 m.

In the absence of a control signal at input 3 (Fig. 2), LED 1 is not excited, photodiode 2 is not illuminated and does not create a photocurrent, switch 5, bipolar transistors 13 and 14 are disconnected. When the photodiode 2 is illuminated, switch 5 is turned on and the potential at the base of transistor 14 continuously increases. As soon as this potential reaches a threshold value, transistors 14 and 13 are unlocked and a significant current is created in their collector circuits, which sharply stops the photocurrent from withdrawing into the input circuit of switch 5 .

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Claims (2)

1. An optoelectronic switch containing an input diode optocoupler, the cathode of the photodiode of which is connected to the bus of the first voltage source, and an output electronic switch, characterized in that, for the purpose of speed, A voltage converter is introduced into the current with a nonlinear transfer characteristic, a capacitor and a resistor, and the inverting input and output of the voltage to current converter, od, capacitor lead, and one resistor lead are connected to the anode 5 of the photodiode, the non-inverting input of the voltage-to-current converter is connected to the thickness of the second voltage source, the second terminals of the capacitor and the resistor are connected to the input of the electronic switch. 2. A switch as claimed in Claim 2, characterized in that the voltage-to-current converter with a non-linear transfer characteristic is formed on two bipolar transistors connected in Darlington circuit, the base of the first, the emitter and the collector of the second The 5 bipolar transistors are respectively inverting and non-inverting inputs and an output of a voltage to current converter. (rig, 2