SU1229911A1 - Device for controlling thyristors - Google Patents

Abstract

The invention can be used to control thyristors in multiphase circuits. The purpose of the invention is to reduce energy consumption. A device for controlling thyristors (T) 1 contains control channels (KU) 3. KU 3 L 1 Lb; G 1P .Hftei l jAJr -.- J 5 JiV T Sch / and ±. p i J 14 V1O I1 :: iJ riL J G, t ltI. -if -. J7 --r-iJrt ifVJj L - - rit-iil - - - ---- t-. consists of a sawtooth voltage generator (GPN) 4, a zero-body 5, a source of control voltage 6. The control pulse generator (IGF) 7 is made on the optocoupler, the LEDs (c) 8. all the optocouplers are connected in series and connected to the power source 2. Photo thyristors (F) 10 optocouplers are connected between the control electrode and the anode of the corresponding T1. The indicated connection C8 and F10 of optocouplers and the inverter cascade on the bipolar transistor (W) 19, its connection to the output inverted cascade on the W 20 provide the same current consumed by the IGF 7, regardless of whether they operate simultaneously or indirectly. - a year to which the power consumption of the device is reduced. 1 il. in C AJr -.- J (L Q. GO N9 CD SO L. j

Description

I1

The invention relates to electrical engineering and can be used to control thyristors in multiphase circuits.

The aim of the invention is to reduce energy consumption.

The drawing shows a schematic diagram of the device.

A device for controlling thyristors 1 contains a stabilized power supply 2 and channels 3 controlling thyristors 1. Each control channel 3 consists of a sawtooth voltage generator 4 connected to one of the inputs of the zero-organ; 5, to the other input of which a control voltage source 6 is connected. The output of the zero-organ 5 is connected to the form of control pulses 7, performed on the optocoupler. The LEDs 8 of the optocouplers of all control channels 3 are connected in series and connected through a resistor 9 to the output of the power supply 2. The photo thyristors 10 of the optocoupler are connected between the control electrode and the anode of the corresponding thyristor 1. The sawtooth voltage generator 4 is made in the form of a relaxation generator on a capacitor 11, which is bridged by a bipolar transistor 12, the base of which is connected through the diode 13 to the corresponding phase of the network. The control voltage source 6 is made on a resistive divider, one of whose arms includes a potentiometer 14, zero-organ 5 is made on two oppositely connected diodes 15 and 16, the load resistor 17 is connected to the connection point of the cathodes, the anode of the diode 15 is connected to the control The main electrode of the auxiliary thyristor 18, the cathode of which through the first inverting cascade on the bipolar transistor 19 is connected to the output inverting cascade on the bipolar transistor 20, the anode of the diode 16 and the anode of the thyristor 18 are the inputs of the zero-organ 5.

The device works as follows.

In the positive half-period of the voltage of phase A, the capacitor 11 of the sawtooth-4 generator is shunted by the open transistor 12. In the negative half-period of the voltage of phase A, the transistor 12 is locked and the capacitor 11 is charged from the power source 2. When the voltage

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on the capacitor 11 is compared with the voltage on the load resistor 17 of the zero-organ 5, set from the source 6 of the control voltage, the diode 15 is opened, and a current begins to flow through the control period of the auxiliary thyristor 18. The thyristor 18 is turned on and turns on the transistor 19 of the first inverting stage of the zero-organ 5. The turn-on transistor 19 shunts the base current. the transistor 20 of the output inverting stage of the null organ 5, and the transistor 20 is locked. The current from the power source 2, which previously flowed through the resistor 9 and the open transistor 20, now begins to flow through the LED 8 of the optocoupler of the phase 7 phase L. At the same time, the photo thyristor 10 of the optocoupler of phase former 7 of phase A is opened, and the control current begins to flow through the control transition of the thyristor 1. When thyristor 1 is turned on, it shunts the photo thyristor 10, and the control current is stopped. Thus, the phase control of the power thyristors 1 is performed. As long as the voltage (the phases are negative, the auxiliary thyristor 18 and the transistor 19 are open by the current flowing from the power source 2. When the voltage of the phase A becomes positive, the transistor 12 of the generator 4 is unlocked by the current flowing through the opened diode 13 and shunting the capacitor 11. The thyristor 1B and the zero-organ transistor 19 are turned off, and the transistor 20 is turned on by the source 2, the LED 8 of the optocoupler of phase 7 is shunted. These phases work in a similar way.

Due to the fact that the LEDs of the 8 yuktron shapers 7 of all channels are connected in series, the current consumed by the shaper 7 is the same regardless of whether they work alternately or simultaneously. Thus, the power consumption of the device is reduced.

Claims (1)

Invention Formula A device for controlling thyristors, containing stabilized, power source, resistor and control channels for the number of thyristors, each of which consists of a generator 31229 A sawtooth voltage connected to one of the inputs of the null organ, the other input of which is connected to the control voltage source, and the output to the control driver j pulses made on the optocoupler whose photo thyristor is intended to be connected between the anode and the control electrode of the thyristor .differentiated by the fact that, in order to reduce power consumption, the LEDs of the control pulse formers of all channels are connected in series and connected via a resistor to the output of the stabilized jj power source and the sawtooth generator of each channel is designed as a relaxation oscillator Editor G. Gerber Compiled by V. Zhmurov Tehred M. Khodanich Proofreader A.Zimokosov Order 2457/56 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, d, 4/5 Production and printing company, Uzhgorod, Projecto st., 4 four on a bipolar transistor, the control voltage source is filled in the form of a resistive divider, one of the arms of which includes a potentiometer, the zero-body is executed on two counter-connected diodes, to the connection point of the cathodes of which a load resistor is connected, the anode of one of the diodes is connected to the control electrode of the auxiliary thyristor, whose cathode through the first inverting cascade on a bipolar transistor is connected to the output inverting cascade on a bipolar transistor, and the anode of the auxiliary transistor aiod variable resistor and the second diode are inputs of zero - the body.