SU830648A1 - Electronic switch - Google Patents

Description

(54) ELECTRONIC KEY

  one

The invention relates to a pulse technique and can be used in systems combining AC power circuits. . the AC key is known, consisting of a power circuit with two anti-parallel-connected thyristors, a transformer of resistors and diodes i.

The disadvantage of this device is the limited value of permissible instantaneous values; Ossnyh power given for transistors.

Also known is an AC switch containing the first and second anti-parallel connected thyristors connected in series with the load between the power supply terminals and the starting circuit of the series-connected closed contacts, self-retaining two-winding relay, first diode, capacitor, second diode and open contacts of the first button 2.

A disadvantage of this device is the presence of a contactor relay having a limited permissible operation and significantly reducing the reliability of the device.

The purpose of the invention is to increase reliability ..

To achieve this goal, an electronic key containing the first and second anti-parallel connected thyristors — power supply terminals connected in series with the load and the short circuit starting circuit of the first diode, capacitor, second diode and end button and resistor connected between power supply terminals; a transformer, additional capacitors, diodes, and a disconnecting button are inserted, with the primary winding of the transformer and the disconnecting button connected in series connected in parallel to the load, the first terminals of the secondary windings are connected to the cathodes of the corresponding thyristors, and the second terminals respectively through the third and fourth diodes are connected to the control electrodes of the thyristors,

Claims (2)

at the same time, the control electrode of the first thyristor through the fifth diode is connected to the cathode of the first diode of the starting circuit, and the transitions of the cathode control electrode of the thyristors are shunted by the corresponding capacitor capacitors. The drawing shows a circuit diagram of the device. The electronic key contains on-. anti-parallel thyristors 1 and 2, connected in series with load 3 between terminals of power source 4, start circuit of series-connected diode 5, capacitor 6, diode 7 and make contacts of button 8, resistor 9 connected to the anodes of diodes 5 and 7, connected according to each other, the transformer 10, the primary winding of which is connected parallel to the load through the disconnecting button 11, and the secondary 5 windings — and the first. the leads are connected to the cathodes of the corresponding thyristor 1 to 2, and the second, respectively, through danes 12 and 13 are connected to. the control electrodes of the thyristors .1 and 2, while the control electrode of the thyristor 1 is connected via diode 14 to the cathode of diode 5, in addition, the transitions of the cathode control electrode of the thyristors 1 and 2 are shunted respectively by capacitors 15 and 16. The device operates as follows in a way. In the initial state, the thyristors 1 and 2 are closed and the current through the load 3 does not pass. After pressing button 8 at the moment when voltage of power supply 4 is applied to diodes 5 and 7 in the forward direction, capacitor 6 begins to charge through diodes 5. and 7. At this moment, thyristor 1 is closed by reverse voltage, and thyristor 2 is closed due to the absence of voltage on the control electrode. At the time of the beginning of the decay of the supply voltage WAVE, capacitor b starts up through diode 14, the control electrode is cathoristor 1, and resistor 9. Turning on the tristor 1 occurs at the moment when the next half-wave of the supply voltage starts. Through the transformer 10, the current flows. In the secondary winding this voltage is induced by a voltage in such a way that a positive potential is applied through diode 13 to the control electrode of thyristor 2 and capacitor 16, charging it and preparing the thyristor for opening in the next half-wave (negative). In the case of a negative half wave, the thyristor 2 becomes conductive, and the thyristor 1 is prepared for operation similarly to the thyristor 2 described. Regardless of the starting chain, the operation of the device starts and the button B can be released. To prevent losses in the start-up circuit, there is a diode 5, which is biased in the opposite direction by the control voltage of the thyristor 1 and does not let the current through. To turn off the device, it is necessary to press button 11. At the same time, the primary winding is de-energized and the supply voltage to the control electrodes of thyristors 1 and 2, which are closed, is not supplied. The device returns to its original position. Thus, the proposed key is highly reliable, due to the elimination of the relay contacts, in addition to TOGO), it can be used at considerable power. The invention includes an electronic switch containing the first and second anti-parallel connected thyristors, connected in series with the load between the power supply terminals and the starting circuit consisting of the first diode connected in series, the capacitor, the second diode and the closing button, and a resistor connected between the source terminals power supply, characterized in that, in order to increase reliability, a transformer, additional capacitors, diodes and a disconnecting button are introduced, with the primary winding connected in series The transformer and the disconnecting button are connected in parallel to the load, the first leads of the secondary windings are connected to the cathodes of the respective thyristors, and the second leads, respectively, through the third and fourth diodes are connected to the control electrodes of the thyristors, and the control electrode of the first thyristor is connected through the fifth diode to the cathode of the first the start-up diode, in addition, the transitions of the cathode-control electrode of the thyristors are shunted with appropriate and additional capacitors. Sources of information taken into account in the examination 1. USSR author's certificate number 413627, cl. And 02 K 17/68, 1972. 2. USSR author's certificate number 513500, cl. H 02 K 17/68, 10/15/74.