SU1707754A1 - Optoelectronic switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in information input devices and proximity sensors. The purpose of the invention is to enhance the functionality of the optoelectronic switches and increase the reliability of the device with a large number of switching cells. A block 9 of cell communication is entered into a device containing a clock generator 1 of pulses, a block of 2 emitters, switching screens 3, photodetectors 4 and a block of 6 switching elements. Channel switching is performed by shutting down the optical communication between the emitter and the photoreceiver by switching screen 3. Unit 9 performs in the device the functions of eliminating the dialogical contact bounce and signal generation, V Tfc / tf bo t j about 1 h, JSb common for all cells

Description

permits switching on the corresponding switching element of block 6. Each cell of block 6 consists of RS flip-flop 7 and a series-connected counting flip-flop 8. RS flip-flop outputs are the first outputs of the device and provide the function of the Latch button, the outputs of the counting flip-flops (second outputs of the device) provide the function of the button with independent latching. The output of the cell communication unit generates a tracking signal, 2p.p. f-ly, 1 ill.

The invention relates to a pulse technique and can be used in switches, contactless sensors, information input devices of various types.

destination.

The aim of the invention is to enhance the functionality and increase reliability by simplifying with a large number of switch cells.

The drawing shows the circuit of the optoelectronic switch.

The optoelectronic switch contains a generator of 1 clock pulses, emitters 2i - 2P, switching screens 3i - 3p, photodetectors 4i - 4p, driver 5 pulses, block 6 of switching elements, switching elements 6i - 6p, RS-triggers, 7i - 7P and counters 81 - 8P, block 9 of cell communication, element AND 10, element OR 11, counter 12, first decoder 13, counter 14, multiplexer 15, second decoder 16.

The clock pulse generator 1 is connected to the input of the first counter 14 and the second input of the imaging unit 5 pulses, the outputs of the counter 14 are connected to the corresponding inputs of the first decoder 13, the outputs of which and the power bus are connected to the emitters 2i - 2P. optically connected with photo detectors 4i-1P, and in each optical communication channel there is a switching screen 3i-3p, photo detectors are connected to the power bus and inputs of the multiplexer 15, control inputs of the multiplexer are connected to the outputs of the counter 14, and the output is connected to the first input of the imaging unit 5 pulses, the output of which is connected to the gate input of the second decoder 16 and the first input of the cell communication block 9, the inputs of the second decoder are connected to the corresponding outputs of the counter 14, and the transfer output of the counter 14 is connected to the second input of the block 9 communication cells.

The outputs of the second decoder 16 are connected to the first inputs of a block of 6 switching elements, the first outputs of which are connected to the third inputs of a cell communication block 9, the output of which is connected to the second inputs of a block of 6 switching elements. Switching elements 6i-6P contain RS-connected triggers 7i - 7P and counters 8i - 8p, respectively, with the S-inputs of the flip-flops connected to the first inputs of the block 6 of switching elements, and the R-inputs to the second inputs. The outputs of the trigger 7i - 7P are connected to the first outputs of the optoelectronic switch, and the outputs

counters - with the second outputs of the device. The cell communication block 9 contains an OR element 11, the inputs of which are connected to the third inputs of the cell communication block 9 and the output to the first input of the cell and 10, the second

the input of which is the second input of the cell communication unit 9, the output of the And 10 element is connected to the counting input of the counter 12. the installation input into O of which is connected to the first input of the cell communication 9 and the output

connected to the output of the optoelectronic switch.

The first and second outputs of block 6 of switching elements and the output of block 9 of cell connections are the outputs of the device.

Optoelectronic switch works as follows.

Each optoelectronic switch cell includes a 2-2p emitter, an optically coupled 4i-4p photodetector, a switching element 6i-6p, and a switching screen 3i-3p, which allows the emitter to interrupt optical communication with the corresponding photodetector.

The control of the radiators is implemented on the basis of the first decoder 13, the inputs of which receive the output signals of the counter 14. A pulse shaping unit for switching elements 6i - 6P

includes an analog multiplexer 15, a pulse shaper 5 and a second decoder 16, which, with the counter 14, constitutes a pulse distributor arriving at the gate input of the decoder 16 from the output of the pulse shaper 5.

In the initial state, the output signal of the driver 5 pulses is absent, and therefore there are no pulses at the output

the second decoder 16 switching

elements 6i - 6P are in the initial (off) state.

When the Zch - Zp switching screen of the optical communication channel overlaps between the emitter 2i - 2P and the corresponding photo receiver 4- | - 4P at the output of the generator 5, pulses appear that cause the appearance of pulses at the corresponding output of the second decoder 16. Which, in turn, determine the inclusion of the corresponding switching element 6i - 6P.

The circuit implementation of the switching elements 6i-6P and the cell communication unit 9 determines the functionality of the optoelectronic switch: Without latching, With dependent latching, With independent latching. The circuit implementation of the switching elements 6i-6P and the cell communication unit 9 provides the implementation of the Non-latching and C-independent latching functions. At the same time, the output pulses from the imaging unit 5 pulses, arriving at the first input of the cell communication unit 9 and further to the installation input in O of the counter 12, set the counter 12 to the zero state, the output signal of the higher bit of the counter goes to the R inputs RS-trigger - ditch 7i - 7n. by enabling the RS-flip-flop.

The pulses arriving at the S-inputs of the RS flip-flops from the output of the second decoder 16 cause the RS flip-flop to start. the output signal of the RS flip-flop is fed to the output of the optoelectronic switch, as well as to the input of the counter 81 - 8n. causing it to switch to the next state, and to the third input of the cell communication unit 9. From the third input of the cell communication unit 9, the output signal of the RS-trigger through the element OR 11 goes to the first input of the element 10. It allows the pulses from the counter 14 to the counting input of the counter 12

At the initial and final moments, the switching screen 3i - 3p of the optical communication channel between the emitter and photoreceiver is possible due to the effect, similar to the bounce effect of the contacts of a mechanical switch, the appearance and disappearance of pulses at the output of the imaging unit 5 pulses, and consequently, at the installation input a About counter 12. Since the clock pulses at the counting input of the counter continue to flow (through the element And 10). the counter will be filled. The capacity of the counter is chosen so that the short-term disappearance of pulses at its installation input into O does not cause switching of the most significant bit of the counter.

After the overlap of the optical channel between the emitter and photodetector stops, there are no pulses at the output of the imaging unit 5 pulses, and therefore no input at the installation to the counter 12, the counter is completely filled with pulses coming to the counting input and the signal (single) from the output of the last discharge of the counter at the output of the communication unit of the cells, at the output of the optoelectronic switch and at the inputs of the installation in RS-type flip-flops 7i-7P. causing the switched on trigger of the activated cell of the switch to the zero state, thereby stopping the flow of pulses to the input of the counter 12 through the AND 10 element.

Similarly, the optoelectronic switch works when any switch cell is turned on; when the same switch cell is turned on again, the output signal of the RS flip-flop 7i-7p switches the counter 8i-8p to the next state.

The output signal of the RS-flip-flop 7i-7P (switch output) can be used as an output signal when implementing the switch function Non-latching — an electronic button (counter 8i-8p is not used at the same time).

When used as a counter 81 - 8n counting trigger its output signal (output) is used to implement the functions of the switch With independent latching.

When switched on as a switching element 6 i - bp register, the device will function as a code switch. In this case, the data inputs of the register receive information from the outputs of the counter 14, and the information is recorded by the output signal of the driver 5 pulses. The OR element of the cell communication unit 9 is replaced by the NOT element whose input is connected to the output of the counter 12.

Claims (3)

Claim 1. An optoelectronic switch comprising a clock pulse generator, an emitter optically coupled to a photodetector, a switching screen in the optical communication channel of the emitter and photoreceiver, as well as a pulse counter whose input is connected to a clock generator, characterized in that in order to expand functionality and increase reliability, a block of switching elements, the first decoder, are introduced into it, between the outputs of which and the power bus are connected emitters, and the inputs are connected to the corresponding outputs of the pulse counter, a multiplexer, between the inputs of which and the power bus are connected photo detectors optically connected to the corresponding radiators and having switching screens in the optical links, the control inputs of the multiplexer are connected with the corresponding outputs of the pulse counter and the inputs of the second decoder, and the output of the multiplexer is connected to the first input of the pulse former, the second input of which is connected to the output of the clock pulse generator, and the output is connected to the gate input of the second decoder and the first input of the cell communication unit, the second input of which is connected to the transfer output of the pulse counter; the outputs of the second decoder are connected to the first inputs of the switching element unit, the first outputs of which are connected to the third inputs of the cell communication unit, the first outputs of which are connected to the second inputs of the block of switching elements, the first and second outputs of which, as well as the output of the communication unit of the cells, are outputs real estate. 0 five 2. The switch according to claim 1, about tl and h and y - y and so that the block of switching elements contains cells by the number of photodetectors, which are made of series-connected RS-flip-flop and counter, and the inputs S and R of the flip-flops connected respectively with the first and second inputs of the switching unit, the outputs of the RS-flip-flops are connected to the inputs of the respective counters and the first outputs of the switching elements of the block, the outputs of the meters connected to the corresponding second outputs of the block of switching elements. 3. The switch according to claim 1, about tl and h and y - n and with so. that the communication unit of the cells contains a counter, the element AND and the element OR, whose inputs are connected to the third inputs of the communication unit of the cells, and the output to the first input of the element AND, the second input of which is connected to the second input of the communication unit of the cells, and the output the counter input of the counter, the installation input of O which is connected to the first output of the communication unit of the cells, and the output of the higher bit of the counter connected to the first outputs of the communication unit of the cells and the output of the device.