SU1534672A1 - Device for controlling thyristor - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control alternating current in the load. The purpose of the invention is to simplify the device and increase its reliability. The introduction of a voltage divider on resistors 10 and 11, one output of which is through diode 12, control key 14 and resistor 15 is connected to the collector of transistor 7, the other through capacitor 13 to cathode of diode 12, and the middle point to base of transistor 7, provides a simple source of thyristor 1 control pulses to the mains voltage zero crossing points. The presence of a small number of elements and the inclusion of the thyristor 1 at the moments of the passage of the mains voltage across zero ensures a significant increase in the reliability of the device in the absence of electrical interference. 2 Il.

Description

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The invention relates to electrical engineering, in particular, to the management of the supply of electrical energy to a load in electrical networks of transient current.

The purpose of the invention is to simplify the device and increase its reliability.

FIG. 1 is a schematic diagram of a device for single-half-cycle thyristor control in an alternating current circuit; Fig. 2 is a schematic diagram of a device for two-half-period control.

A device for controlling a thyristor 1, connected to input terminals 2 and 3 in series with a diode 4 and a load 5, contains a diode 6 connected anti-parallel to the thyristor 1, a transistor 7, the collector of which is connected via a switching element 8 to a control electrode thyristor 1, a. emitter - with its cathode, resistor 9 connected between the cathode of diode 4 and one output of a voltage divider made on resistors 110 and 11, in parallel with which are connected in series a diode 112 and a capacitor 13, the average point of the voltage divider is connected to the base the transistor 7, the connection point of the diode 12 diode and the capacitor 13 through the control switch 14 and the resistor 15 is connected to the collector of the transistor 7.

The device works as follows.

At the positive half-wave of the variable voltage (fig, 1), the capacitor 13 is charged through diodes 4 and 12 and resistor 9. In addition, a positive potential is applied to the base of transistor 7 from the resistor 11, which opens up the transistor 7 for almost the entire positive of the non-alternating voltage, and only when the alternating current passes through its zero value, does the transistor 7 close, and if the switch key 14, then a positive pulse appears on the collector of transistor 7 Ichin which readily calculated choice of resistor 15 and capacitor 13, C moments of occurrence of a positive half cycle voltage for each thyristor 1 is opened with almost zero anode voltage uc

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Switches on power surges. To eliminate the application of the reverse voltage on the thyristor I, it is shunted by diode 6, to break the load circuit, use diode 4. Introducing a resistor divider and connecting its drain to the base of transistor 7 provides a simple source of power thyristor control pulses during zero value

The presence of a small number of elements in the circuit and the inclusion of the thyristor 1 at times during the transition of the supply alternating voltage through zero provides a significant increase in the reliability of the device as a whole with the practical absence of electrical interference, which makes this device very promising for widespread use in almost any national household. Properties where previously thyristors were not used due to electrical interference from which they originated,

With full-wave power supply, load 5 through the thyristors 1 and 1, diodes 4 and 4 in one half-period the corresponding thyristor is shunted, and in the other half-period the load current flows through them, i.e. they are used with greater effect than in the half-wave scheme.

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Claims (1)

Invention Formula A device for controlling a thyristor connected in series with a power diode and a load on an alternating current circuit comprising a first diode designed to be connected anti-parallel to the thyristor, and a circuit consisting of a series-connected switching element, one terminal of which is intended to be connected to the control electrode of the thyristor key, characterized in that, in order to simplify the device and increase "reliability", a resistive voltage divider is introduced, serially connected to the second an iodine and a capacitor, a resistor and a transistor, the second diode and the capacitor connected in series are connected in parallel to a voltage divider, one output of which is connected to one output of the resistor and the anode of the second diode, 5J534672 the other is designed to connect the key and the emitter to another output to the cathode of the thyristor, and the midpoint of the resistive voltage divider is connected to the base of the transistor, the collection of another output of the control key is connected to the connection point % element and one output managed A dinene with the cathode of the second diode, and another output of the resistor is intended for connection to the cathode of a power diode. Compiled by A. Merkulova Editor M.Blanar Tehred M. Khodanych Order 53 Circulation 480 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 key, and the emitter is connected to another output of a resistive voltage divider, another output of a controllable switch key dinene with the cathode of the second diode, and Druklyucha, and the emitter - to another pin of the resistive voltage divider, another pin of the controlled key of the junction This output of the resistor is intended to be connected to the cathode of a power diode. YU & / IV b Faye. 2 Proofreader M.Sharoshi