SU59168A1 - Multistage time relay - Google Patents

Description

The known time relays have major drawbacks, first of all, a very limited range of exposures and low accuracy, and for some types of relays, a large dependence of the extracts of time on the supply voltage.

Particularly difficult is the task of obtaining a time relay, which ensures long shutter speeds and does not have it, with the disadvantages indicated above. The design of electronic time relays offered so far could not be dried: for long time exposures (about 10–30 minutes or more), since this would require very large capacitances and resistances, which would greatly increase the cost of the relay and lead to completely unacceptable for practice dimensions.

The subject of this author's certificate is a multi-stage time relay, which provides it, but the inventors' assumptions, to obtain sufficiently long time exposures without the use of large capacitances and resistances; The proposed multi-stage time relay consists of a series of sequentially triggered, their circuits, each consisting of a capacitor and a discharge device. In this case, according to the invention, the connection between the stages (circuits) is carried out with the help of transformers, and a rectifier is sequentially connected to each (excluding the first) stage for charging the capacitors.

The drawing shows the basic electrical circuit of the proposed time relay.

As can be seen from the diagram, when the key K is closed, the capacitor C will be charged from the supplying constant voltage U through the resistance.

Through time t- equal to

L ,,

where Oz is the voltage of the ignition threshold of the discharge gap Yar, the voltage across the capacitor Ci reaches Uy, the discharge gap PI will break through and the discharge current through the primary winding of the interstage MT transformer will cause a corresponding alternating voltage on the secondary winding of the transformer L1T. The current created by him, passing through the kenotron L, rectifies and causes the capacitor C to charge (through co-stimulation /,).

In this case, the alternating voltage will exist in the secondary circuit of the interstage MT transformer only for a short period of time tsK of penetration of the discharge gap PI by the discharge voltage t / 8 of the capacitor Cj.

After discharging capacitor C, after a discharge gap PI, the process will repeat, i.e. capacitor Ci will start to charge, and so on.

Such a process will be repeated until those voltages until the voltage on the capacitor Cz reaches the ignition threshold of the discharge gap P3, breaks through it and initiates an intermediate relay 5, which will send a pulse to the operating price.

If 4 is the time spent from one breakdown gap to another, t-i is the charging time of the capacitor C3 through the resistance R "with continuous power, then the total time delay for the cascade connection of two electronic relays is 4asc. express the formula

/ rt-,

helmets -

SK

Since 4k can be quite: small (on the order of 0.5-10 sec.), And t and Z. are relatively large (on the order of 0.3-0.5 sec.), The range of exposures can be obtained up to 30 -60 minutes The resistances and capacitances in the proposed circuit are very small.

Therefore, wire resistances and precision mica capacitors can be used.

The timing adjustment can be made by varying the resistance or capacitance.

The supply voltage may also be variable; in this case, you can put a cuprox rectifier.

In order to obtain independence of time exposures from voltage, one can apply stabilization by its glowing discharge.

The subject matter of the invention.

A multi-stage time relay made up of a series of successively operating circuits each consisting of a capacitor and a discharge mushroomor, characterized in that the cascade connection (circuits) is made using transformers and for charging the capacitor into each (starting from the second) cascade included sequentially straightener.

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