SU1410180A1 - Electronic voltage relay - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used to control the voltage level of DC power sources. The aim of the invention is to simplify the device and increase its reliability. As the voltage of the monitored power source increases, the collector current of transistor 1 increases. The relay 4 triggers, closes its contact 7. The division ratio of the voltage divider changes in this case. After the discharge of the capacitor 5, the collector current of the transistor 1 is reduced. 1 il.

Description

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The invention relates to electrical engineering i can be used to control (Voltage level of DC power sources.

The aim of the invention is to simplify the electronic relay and increase its reliability.

The drawing shows the circuit diagram of the proposed electronic voltage relay.

The relay contains a transistor 1, the base circuit is costly connected to the output of a resistive voltage divider consisting of resistors 2 and 3. The coil 4 of the electromagnetic actuator is included in the collector circuit of the ranzistor 1. A capacitor 5 is connected to the output of the voltage divider and an additional resistor 6 is connected in series with each other, and there is no make contact 7 of the actuator. Pins 8 and 9 of the relay are connected to a DC source, the voltage of which must be monitored.

The electronic voltage relay operates as follows.

When the voltage of the monitored power source increases, the voltage at the output of the voltage divider | on the resistor 3 increases and, accordingly, the collector current of transistor 1. When the collector current flowing through the cable 4 of the electromagnetic actuator reaches, the value of the operation current is triggered, This closes the contact 7 and resistor 6 is connected in parallel to the resistor 3, as a result of which the division factor of the voltage divider changes, and the voltage at its output after discharge of the condensate ra 5 decreases. The resistance of the resistor 6 is chosen so that the collector current of the transistor 1 is at the same time slightly higher than the release current of the executive body. The resistance value of the resistor 6 determines the return coefficient of the relay.

The capacitance of the capacitor 5 must be minimal so that the inertia of the relay increases slightly (unless specifically required) and ensures reliable operation of the actuator after the contact 7 is closed.

When the voltage of a controlled power source decreases, the voltage decreases.

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the output of the voltage divider and, accordingly, the collector current of the transistor. When the collector point reaches the value of the release current of the actuator, the latter is released. Contact 7 is open, resistor 6 is disconnected from resistor 3, and the voltage at the output of the voltage divider after charging the capacitor 5 increases. The collector current of the transistor also increases, but it does not reach the actuator actuation current.

When the actuator operates, its contacts (not shown) in the signaling or control circuits are also switched.

Perform the same functions as the well-known, proposed electronic relay is simpler in design and more reliable in operation due to the exclusion from the circuit of the additional electromagnetic relay.

Thus, supplying the electronic voltage relay with a capacitor connected to the output of the voltage divider, and connecting parallel to the capacitor in series an additional resistor and make contact of the electromagnetic actuator, simplifies the design and improves the reliability of the relay, ensuring a high return coefficient. In addition, the reliability of the relay is improved.

Claims (1)

Invention Formula An electronic voltage relay containing a transistor, an executive relay with a closing contact, a resistive voltage divider, a resistor, leads for connecting a power source, the winding of the executive relay and a transistor connected in series and connected to the leads for connecting a power source to which a resistive divider, for example, is connected the medium point of the resistive voltage divider is connected to the base of the transistor, characterized in that, in order to simplify the electronic relay and increase its reliability, A capacitor is introduced, and the capacitor is connected in parallel with the base-to-emitter junction of the transistor, and the resistor is connected via the make contact of the executive relay.