RU2767604C2 - Combined relay - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to the field of electrical engineering, namely to switching elements used in electronics and electrical engineering; it is intended for controlling electrical devices connected to a DC electrical network. When the actuating voltage is applied to a control module, signals for switching on a semiconductor key and an electromechanical key in a certain sequence are generated, which close or open switching outputs of the device according to a certain algorithm that compensates for transient processes, causing negative consequences. The absence of heating of the entire device as a whole during the flow of current is ensured by closing the switching output with the electromechanical key due to the practical absence of a voltage drop on its contacts. The combined relay consists of an operating voltage generator, a control module, an electromechanical key, a semiconductor key, and a galvanic isolation element.EFFECT: rapid provision of switching without heat generation, absence of the formation of negative consequences in the form of “sticking” of contacts, and reduction in the occurrence of switching interference.1 cl, 1 dwg

Description

The invention relates to switching elements used in electronics and electrical engineering, and is intended to control electrical devices connected to an AC or DC electrical network.

Electromechanical relays with normally closed or normally open contacts are known, as well as electronic relays of various types, which also perform the functions of closing and opening an electrical circuit.

A feature of electromechanical relays is the small dependence of the relay dimensions on the parameters of the switched physical quantities: voltages and currents. Along with this electromechanical relay, negative phenomena are characteristic - contact bounce, spark formation, radio interference, burning and sticking of contacts.

The dimensions of electronic relays largely depend on the values of the switched voltages and currents. These types of relays can be performed in fairly compact versions, but, bearing in mind the need to remove heat generated in a semiconductor junction when a current of any value flows, the total dimensions of electronic relays exceed the dimensions of electromechanical relays that switch the corresponding currents and voltages, which is a significant drawback.

Combined relays are devoid of the above disadvantages, since the switched currents flow through the contacts of the electromechanical relay and the electronic key switched on according to a certain algorithm, excluding heat generation. The processes of turning currents on and off (transients) occur in a semiconductor key, which is also turned on or off according to its own algorithm, logically connected with the algorithm of an electromechanical relay, while contact bounce, spark formation, radio interference, and contact burning are excluded. Thus, the combined relay does not need to organize a heat sink, and due to the absence of sparking, burning and sticking of contacts, it compares favorably with electromechanical relays. The switching on and off times of the combination relay are adjustable. In this case, the switching time is in any case much less than the switching time of the electromechanical relay. The combined relay allows you to increase the estimated life of the electromechanical relay in relation to the same relay used in the traditional switching circuit. In terms of the dimensions of the main construct, the combined relay is similar to the electronic relay, but due to the absence of heat-removing elements, the volume occupied by the combined relay in the circuit is much smaller.

The objective of the invention is to use it as a switching element without the formation of a spark and the exclusion of a long-term flow of the switched current through a semiconductor key.

EFFECT: fast provision of switching without heat generation, absence of negative consequences in the form of "sticking" of contacts and the occurrence of switching interference.

The absence of heating of the entire device as a whole during the flow of current is ensured by closing the switching output with a key due to the practical absence of a voltage drop on its contacts, which, in turn, is ensured by closing the closed state for the entire time by the contacts of the electromechanical key.

The claimed invention is illustrated in Figure 1, which shows a diagram of a combined relay.

The combined relay consists of an operating voltage driver 1, a control module 2, an electromechanical key 3, a semiconductor key 4 and a galvanic isolation circuit 5. The device is mounted in a plastic case with pin, flat or flexible (as required) leads.

The operation of the combined relay is as follows.
A low-voltage control signal, which can be either a DC voltage or an AC voltage of 3 to 30 Volts, is applied to the input of the working voltage driver 1, which generates the DC executive voltage to ensure the operation of the relay circuit. When the executive voltage is applied to the control module 2, it generates switching signals for the semiconductor key 4 and the electromechanical key 3 in a certain sequence, which close or open the switching outputs of the device with keys 3 and 4 according to a certain algorithm. The essence of the switching sequence of keys 3 and 4 is to compensate for transient processes that occur in key 3 and cause negative consequences by closing key 4 - high-speed and does not create negative consequences. The absence of heating of the entire device as a whole during the flow of current is ensured by closing the switching output with key 3 due to the practical absence of a voltage drop on its contacts. Element 5 provides galvanic isolation of the device circuit and semiconductor key 4.

Claims (1)

Combined relay for switching electrical circuits as a power switching element controlled mainly by a low-voltage control signal, consisting of an operating voltage driver, a control module, a galvanic isolation circuit, an electromechanical switch and a semiconductor switch, while the control module turns on and off the semiconductor and electromechanical switches in a certain sequences, with closing and opening of switching outputs by keys according to a certain algorithm, compensating transients in an electromechanical key.

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