SU1520607A1 - Device for controlling two-position object - Google Patents

Abstract

The invention relates to the automation of technological processes and can be used to control objects with increased demands on the shape of the supply voltage or high switching currents. The purpose of the invention is to increase reliability. The use of two AC relays 3 and 4 with pins 11 and 14, respectively, and three diodes 12, 13 and 17 allows, using two control contacts 15 and 16, to turn on and off load 6 at the beginning of the negative half-wave of the supply voltage. 1 il.

Description

The invention relates to the automation of technological processes and can be used to control objects with increased demands on the shape of the supply voltage or high switching currents.

The purpose of the invention is to increase reliability.

The drawing shows a circuit diagram of a device for controlling a two-stage object.

The device contains an AC power supply 1, the first pin 2 of which is connected to the first winding pin of the first AC relay 3, the first winding pin of the second AC relay 4 and the first pin 5 to connect the load 6 "The second pin 7 of the power source 1 through two parallel chains 8 and 9 are connected to the second output 10 of the load 6o. The first chain 8 consists of a series-connected closing contact II relay 3 and a diode 12 "The second chain 9 consists of a series-connected diode 13 and clamping the contact 1 4 relays 4. The cathode of diode 12 is connected via an opening contact 15 to the cathode of diode 13, and through disconnecting contact 16, shunted by diode 17, to the second terminal of the winding of the first relay Zo. Second terminal of the winding 4 of the second relay is connected to the anode of the diode 12c

The device works as follows.

When a switch-on command is applied to the device (closure of the switch-on contact 15), a positive half-wave of current from the alternating voltage source 1 is fed to the winding 3 of the first turn-off control. If the power of the positive half-wave of alternating current in this half-period is not enough to turn on the first relay, it will turn on the next positive half cycle. After the first relay is switched on, its contact 11 closes, the relay becomes self-picking. Following the first relay’s switching on, the negative half-current of the black Without diode 12 it closes to the winding 4 of the second relay. At the same time, the negative half-wave of the current passes through the load 6 through a circuit, terminal 7 of the alternating voltage source 1 - contact 11 diode 12

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source 1 pe- second relay 4

Load 6 - pin 2 of the belt voltage turns on, closes its contact 14 and becomes self-picking. The next half-wave of current from the alternating voltage source 1 is through diode 18, contact 14 closes on the winding 4 of the second relay and on load 6, and through contact And, opener contact 16 off, on the winding 6 of the first relay

When the device is disconnected, the disconnecting contact 16 of the opening is disconnected and the start of the positive half-cycle of the next half-open disconnects the relay 3, since the positive current half-wave causes the relay to open. At this, the relay 4 remains closed, the same half-wave current is closed along the circuit v ( water 7 of the alternating current source 1 - diode 16 - contact 14 - relay 4 winding - output 2 of the alternating current source 1, and a positive polarity flows through the load 6 With the onset of the negative half yes, the supply voltage is turned off by the relay 4, since the contact P of the relay 3 is open in its power supply circuit. The relay 4 is disconnected, while in the negative half-period the current through the load 6 does not flow

Thus, the proposed device allows switching the supply voltage in the absence of current in the load circuit. In addition, if a number of periods is connected in parallel to the load, the device allows a number of periods to pass through the load, since the load is switched on only from the positive half-wave of the supply voltage, and the load is turned off only when the negative half-wave of the supply voltage

Claims (1)

The advantage of the proposed device is a reduction in the number of contact elements, a decrease in semiconductor elements, which increases the reliability of the device. In addition, the proposed device significantly expanded the range of relays used. A device for controlling a two-stage object containing a closing on contact, a disconnecting disconnect contact, two AC relays with a closing contact each, terminals for connecting the load and three diodes, the first output for connecting an AC voltage source connected to the first output for connecting the load and the first The relays are connected to the windings; It is due to the fact that, in order to increase reliability, the second output is for connecting an alternating voltage source through two para-circuits, the first of which consists of series-connected closing contact of the first pejje and the first diode, the second one of the series-connected second diode and the closing contact of the second relay is connected to the second one for connecting the load and the second one to the winding of the second relay, the connection points of the diodes and the closing contacts of the relay in the specified serial circuits are interconnected via the closing on contact, the connection point the first diode and the closing contact of the first relay through the disconnecting contact disconnected by the third diode, is connected to the second output of the first relay, the first and the second diodes are connected in opposite directions of conductivity, the first and third diodes are connected with each other by the same electrodes. Compiled by A. Karetnikov Editor AoMotyl Tekhred L. Serdyukova Proofreader N. Korol Order 6765/54 Circulation 696 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 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Subscription