SU1150748A2 - Switching device - Google Patents

Abstract

SWITCHING DEVICE according to auth. No. 911729, distinguished by the fact that, in order to expand its functionality, it additionally contains a triac. -1U resistor, load contact contacts, first and second contact sensors, with an additional triac connected in series with the load between the cathode of the main triac and the pole of the alternating voltage source, the additional resistor is switched on with the control electrode of the additional triac and the anode of the first diode and a chain of serially connected contacts of the second sensor and load block contacts are connected in parallel with the control transition of the additional simistra. (L

Description

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The invention relates to a pulse technique and is intended for switching active or reactive loads using low-power contact sensors for material level, temperature, etc.

According to the main author, No. 911729, a switching device is known that contains a triac connected in series with the load by the poles of an alternating voltage source, the first and second capacitors, the first and second diodes, resistors, control buttons, the first capacitor being connected between the triac cathode and the junction point the first pin of the First Resistor with the anode of the first diode, the cathode through a series circuit of the second resistor and the second capacitor is connected to the connection point of the load with the pole of the source of change th voltage and the second terminal of the first resistor is connected to a control electrode of the triac yu1tsim, the cathode of the second diode connected to the cathode of the triac and the anode of the second diode saedinen with the cathode of the first diode Cl3.

However, the known device has limited functionality, since it cannot control the power load using low-current contact sensors and simultaneously perform zero load protection, i.e. automatically turn it off regardless of the position of the contact sensors: when the supply voltage disappears.

The purpose of the invention is the expansion of functionality ..

This goal is achieved by the fact that the switching device additionally contains a triac, resistor, load block contacts, first and second contact sensors, with an additional triac connected in series with the load between the cathode of the main triac and the pole of the alternating voltage source an additional triac electrode and the anode of the first diode, the contacts of the first sensor and a chain of series-connected contacts of the second sensor and the block contacts are nag narrow in parallel a control of additional transition triac.

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The drawing shows a circuit diagram of the proposed device.

The device contains the main and

5 additional triacs 1 and 2,

connected in series with load 3, for example, a magnetic starter with auxiliary contacts 4, between poles 5 and 6 of a variable source

0 voltage, first 7 and second 8 diodes, first and second capacitors 9 and 10, first, second and additional resistors 11, 12 and 13, control buttons 14 and 15, contacts

5 16 and 17 sensors, for example, material level. I

A capacitor 9 is connected between the cathode of the triac 1 and the connection point of the first terminal of resistor 11 with the anode of diode 7, the cathode of which is connected to pole 6 of the power supply through a series circuit. The second terminal of the resistor 11 is connected to the control electrode of the triac 1, the cathode of the diode 8 is connected to the cathode of the triac 1, and the anode of the diode B is connected to the cathode of the diode 7. The resistor 13 is connected between the control electrode of the triac 1 and

the anode of diode 7. Contacts 16 and a series of contacts 17 and the auxiliary contacts 4 are connected in parallel with the control switch of the stimulator 2.

The device works as follows.

When supplying the supply voltage, the triacs 1 and 2 are locked and the voltage

0 on the winding of the actuator 3 is zero.

With the closure of the button 14 and the positive potential at the pole 5 of the power source through the contacts of the buttons 15 and 14, the transition cathode - control

5, the triac electrode 1, the resistor 11, the diode 7, the resistor 12 and the capacitor 9 are flowing, causing the triac 1 to open. Simultaneously before the voltage drops across the cathode-control electrode of the triac 1 and the resistor 11, the capacitor 9 is charged through the diode 7 in the other half period of the supply voltage when the current flows from the pole

55 6 through the capacitor 1П, recharging it, the resistor 12 and the diode 7, the triammer 1 will be maintained in the open state due to the discharge of the capacitor

3

9 through the resistor 11 and the triac control transition 1. After the button 14 is opened, the triac 1 remains open due to the flow of current through its control transition under the action of the voltage across the capacitor 9.

If the contacts 16 and 17 of the level sensors are open, for example, when the material level is below the lower level, then under the action of voltage on the capacitor 9 through the transition cathode - control electrode of triac 2 and resistor 13 current flows causing unlocking of triac 2, through unlocked simstors 1 and 2 includes a magnetic starter 3 controlling, for example, loading conveyors. By their break contacts 4, the magnetic starter disconnects the low level sensor contacts 17 from the triac control circuit 2. When the high level sensor contacts 16 are closed by a material, the control transition

50748

triac 2 shunts triac

2 also closes the magnetic starter.

3 turns off. The contacts 4 of the magnetic actuator 3 are closed and through the closed contacts 17 of the low level sensor the control circuit of the triac 2 will be bridged until the low level sensor 17 is opened. In the following process, the switching of the triac 2 is repeated. When the power button 15 opens or disappears in the supply voltage network, the triac 1 closes, de-energizes it, and remains closed in the closed position until the button 14 is closed.

Thus, the invention provides power load management using low-power

20 contact sensors depending on the level of the material in the vessel, the temperature of the control object, etc. and at the same time provides zero load protection, which extends the 25-ton functionality of the switching device.

Claims (1)

SWITCHING DEVICE for ed. No. 911729, characterized in that, in order to expand the functionality, it additionally contains a triac, resistor, load contact contacts, first and second contact sensors, the additional triac being connected in series with the load between the cathode of the main triac and the pole of the AC voltage source , an additional resistor is connected between the control electrode of the additional triac and the anode of the first diode, the contacts of the first sensor and a chain of series-connected contacts of the second sensor and block contacts of the load are connected in parallel with the control transition of the additional triac. (/) a