SU1324098A1 - Alternating current optoelectronic switch - Google Patents

Abstract

The invention relates to a pulse switching technique and can: find application in an automation device, industrial electronics, electrical engineering and electric drive. The purpose of the invention, the improvement of the energy characteristics, is achieved by significantly reducing the electrical conductivity of the key JL in the closed state. The device contains a triac 1, a diode bridge 2, LEDs 3 and 4, optically connected with the photo thyristor 5 and photodiode 6, trigger 7, logic device AND-HE 8, first switch-on inverter 9, control bus 10, load 11, bus 12 and 13 sources of alternating voltage, resistors 14, 15, 17, and 22, source 16 of constant voltage, bus 26 of zero potential. In order to achieve this goal, a delay element 18 is added to the device, a third LED 19, optically coupled to the second photo thyristor 20, and a second key-inverter 21, delay element 18, contains a capacitor 23, a logic element 24, a diode 25. the conductivity of the key in the closed state is significantly reduced, which improves the energy characteristics of the device. 1 il. (L

Description

The invention relates to a pulse switching technology and can be used in automation devices, industrial electronics, electrical engineering, electric drive.

The purpose of the invention is to improve the energy characteristics by drying, effectively reducing the electrical conductivity of the key in the closed state.

To In the initial state, the potential on the control bus 10, and therefore, on the input and output of the delay element 18, on the R input of the trigger 7 and on the input of the inverter key 21 corresponds to O,

The drawing shows a schematic diagram of the proposed device

The optoelectronic switch of the alternating current contains a triac 1, a diode bridge 2, the first 3 and the second 4 light diodes 5, therefore the potentials at the output of the key optically connected with the corresponding inverter 21 and at the inverse output: but with the first photo thyristor 5 and photodiode 6, trigger 7, logical ele.

the trigger 7 is at the level corresponding to 1. As a result, the luminous light IS-NOT 8, the first key-inverter 9 Diodes 3 and 19 are not energized and are not idle and control bus 10. The anode of the triac 20 is illuminated, the photothyristors 5 and 20 are not illuminated, are turned off and open the output circuit of the diode bridge 2,

1 is connected to the first input of the diode bridge 2 and through the load 11 to the first bus 12 of the alternating voltage source, the second bus 13 of which

the current through the circuit with load 11 does not leak, triac 1 is turned off. At the exit

connected to the cathode of the triac 1, the analogical element AND-HE 8, and next, at the S input of the trigger 7 at-. 1. In this state, the device input of the diode bridge 2 is connected via the first resistor 14 to the control input of the triac 1, the first output of the diode bridge 2 is connected to the cathode

, at the S-input 1. In so

thoroughly

is absent

The property is located in

from the source of change

the first photo thyristor 5, and the second high -30 current does not consume.

If on the bus 10 y

If a voltage signal corresponding to 1 is supplied to the control bus 10, then simultaneously 1 is fixed at the inputs of the delayed element 18, the signal corresponding to 1 is generated with a delay of approximately a quarter of a half period

the course is connected with the anode of the first photo thyristor 5 and through the second resistor 15 with the anode of the second LED 4, the anode and cathode of the first LED 3 are connected respectively to the source 16 constant n-35 of the inverter key 21 and the R input voltage and the first output terminal - trigger 7. At the output of the element 18 of the resistor 17, the photodiode 6 is connected to the input of the first key-inverter 9. A delay element 18, a third LED 19, an alternating voltage supplied to the second photo-diode, are inserted into the device. - on tires 12 and 13.

Torus 20 and the second key-inverter 21. As soon as a control bus 10 is connected to R-BXO-21 to the input of an inverter key, a high potential (1 /) arrives at the trigger house 7, the second key input removes its output potential abruptly from the inverter. 21 and the input of the element 18 for 45 s and the LED 19 is excited by the source 16 of a constant positive voltage across the circuit with a resistor 22. The illuminated photo thyristor 20 turns on and closes the output circuit of the diode element IS-HE 8, the output of which is 50 of the bridge 2 with the resistor 15 and LED

holder, the output of which is connected to the first input of the logic element AND-NOT 8, the output of the first key-inverter 9 is connected to the second input of the logger connected to the S-input of the trigger 7, the inverse output of which is connected to the second output of the 1st resistor 17, the anode of the third LED 19 connected

-four. If the output voltage of the diode bridge 2 is ac, the LED 4 is excited, illuminates the photodiode 6, which turns on

with a source of 16 constant voltage-55 key-inverter 9 and captures the output

torus 22 — with the output of the second key-in-Bfepropa 21, the cathode and anode of the second photo thyristor 20 are connected respectively to the first output of the di-one bridge 2 and the cathode of the second LED 4.

The delay element 18 can be made in the form of a capacitor 23, a logical element 24 and a diode 25. A capacitor 23 is connected to a zero potential bus 26.

The device works as follows

o In the initial state, the potential on the control bus 10, and therefore, at the input and output of the delay element 18, at the R input of the trigger 7 and at the input of the inverter key 21 corresponds to O,

 5 therefore, the potentials at the output of the inverter key 21 and at the inverse output are therefore the potentials at the output of the inverter key 21 and at the inverse output

trigger 7 is at a level corresponding to 1. As a result, the photocurrent along the circuit with load 11 does not leak, triac 1 is turned off. At the exit

a logical element AND-NOT 8, and then, on the S-input of the trigger 7 at -. 1. In this state it is appropriate

is absent

the idle mode is in standby mode and

from the source of alternating voltage

and does not consume.

If the bus 10 controls the post of a key-inverter 21 and the R-input of the gergo 7. At the output of the ground voltage element 18, the incoming bus 12 and 13.

if the voltage signal corresponds to 1, then simultaneously 1 is fixed at the inputs of the element 18 of the delay of the inverter key 21 and the R input of the trigger 7. At the output of the element 18 is the ac voltage applied to the buses 12 and 13.

a signal corresponding to 1 is formed with a delay approximately equal to a quarter of a half period

 key-inverter 21 and the R-input of the trigger 7. At the output of the element 18 e AC voltage supplied to the bus 12 and 13.

-four. If the output voltage of the diode bridge 2 is ac, the LED 4 is excited, illuminates the photodiode 6, which turns on

the potential of this inverter switch is at a low level, corresponding to O. If the alternating voltage at the output of diode bridge 2 passes through zero.

then the LED 4 is turned off and the output voltage of the key-inverter rises to a level corresponding to

tl 4tl

When the alternating voltage passes through zero and the simultaneous action of 1 at the output of the element 18, the e-saver triggers the logical element AND-HE 8, which switches the trigger 7 The switching moment of the trigger 7 can be adjusted by changing the current in the resistor 15 LED 4. As soon as the trigger 7 switches its inverse output potential, the potential of the LED 3 is excited from the source 16 of a constant positive voltage across a circuit with a resistor 17. The illuminated photo thyristor 5 turns on and closes the output diode circuit step 2. A current flows through the control circuit of the triac 1, the triac 1 opens and closes the circuit with the load 11. The triac t remains switched on while a low potential (O) is present at the inverse output of the trigger 7. The included photo-thyristor 5 shunts and de-energizes the circuit with LED 4 and photo-thyristor 20.

To turn off the triac 1, a low potential (O) is applied to the control bus 10, which is fed to the R input of the trigger 7 and returns the latter to the initial state. At the output of the key-inverter 21 and the inverse of the trigger 7, a high potential (1) appears, and the LEDs 3 and 19 are switched on. When alternating voltage passes on the buses 12 and 13 through zero, the photo thyristor 5 and the simulator 1 are turned off, so the current through the load 11 is stopped. The synchronization circuit, consisting of a resistor 15, an LED 4, a photodiode 6, an inverter key 9 and a photothyristor 20, also remains off, and the device goes into suspend mode.

The principle of the delay element 18 is that at a low potential on the control bus 10, the diode 25 is open and shunts the circuit with capacitor 23. As soon as the high potential (1) enters the control bus 10, the diode 25 closes and the capacitor 23 starts to charge. the input currents of the logic element 24. At the moment when the potential difference on the capacitor 23 reaches the threshold of the logic element 24, this element turns on and

generates a delayed output signal relative to the input signal.

Thus, by introducing into the device of the delay element 18, an LED 19, optically coupled to the photo thyristor 20 and the key-inverter 21, the synchronization circuit of the device most of the working time is open and does not consume appreciable current. The current pulse in the synchronization circuit is short-lived and is formed at the initial moment of switching on (when a signal is sent to the control bus), the duration of this pulse does not exceed the duration of one half-period of alternating voltage. As a result, the electrical conductivity of the key in the closed state is significantly reduced, which improves the energy characteristics of the device.

Formula of invention

An optoelectronic switch of alternating current containing a triac, a diode bridge, the first and second LEDs optically coupled to the first photothyristor and the photodiode, respectively; a trigger, a NAND gate, the first inverter key, a control bus, the anode of the triac connected to the first input of the diode bridge and through the load to the first bus of the alternating voltage source, the second bus of which is connected to the cathode of the triac, the second input of the diode bridge through the first resistor is connected to the control input of the triac, the first output of the diode bridge a is connected to the cathode of the first photothyristor, and the second output is connected to the anode of the first photothyristor and through the second resistor to the anode of the second led, the anode and cathode of the first led are connected respectively to the constant voltage source and the photodiode connected to the input of the first switch -inverter, characterized by the fact that, in order to improve the energy characteristics, a delay element, a third LED, optically coupled to the second photoristor, a second key-inverter, a control bus with It is united with the R-input of the trigger, the input of the second key-inverter and the input of the delay element, the output of which is connected to the first input of the NAND logic element, the output of per5 13240986

of the inverter key is connected to the second, the cathode through the fourth key input of the NAND logic element, the resistor to the output of the second key-output of which is connected to the S-inverter, the cathode and the anode of the second phototrigger, the inverse output which thyristor. They are connected to the second output of the third with the first output of the diode resistor, the anode of the third LED bridge and the cathode of the second is connected to a constant-diode source.

Compiled by A.Sidorov Editor A.Ogar Tehred L.Oliynyk Proofreader A.T.

Order 2972/56. Circulation 901P & write

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim An ac optoelectronic switch containing a triac, diode bridge, first and second LEDs that are optically coupled respectively to the first photo thyristor and photo diode, a trigger, an NAND gate, a first inverter switch, a control bus, and a triac anode connected to the first input of the diode bridge and through the load with the first bus of the AC voltage source, the second bus of which is connected to the cathode of the triac, the second input of the diode bridge through the first resistor is connected to the control input of the triac, the first output of the diode bridge with it is single with the cathode of the first photo thyristor, and the second output with the anode of the first photo thyristor and through the second resistor with the anode of the second LED, the anode and cathode of the first LED are connected respectively to a constant voltage source and with the first output of the third resistor, the photodiode is connected to the input of the first inverter key, distinguishing .ys in that, in order to improve energy performance, a delay element is introduced into it, a third LED optically coupled to the second photo thyristor, a second inverter key, and a control bus connected to The R-input of the trigger, the input of the second inverter key and the input of the delay element, the output of which is connected to the first input of the AND gate, the output of the first inverted key is connected to the second input of the AND gate, the output of which is connected to S- the trigger input, the inverse output of which is connected to the second output of the third resistor, the anode of the third LED is connected to a constant voltage source, and the cathode through the fourth resistor is connected to the output of the second inverter key, the cathode and anode of the second photo thyristor. 5 are connected, respectively, with the first output of the diode bridge and the cathode of the second LED.