DE931535C - Circuit arrangement in which a control relay is excited by a switching measure and is made to drop out again when it is repeated - Google Patents

Description

ISSUED AUGUST 11, 1955

M16465 VIII a 121a *

Johannes Lorenz, Stuttgart

has been named as the inventor

Circuit arrangement,

Patent issued July 14, 1955

The invention relates to a circuit arrangement in which a control relay is actuated by a switching measure made to respond and made to fall away when repeated.

Several circuits, usually named clock circuits, have already become known for this purpose. These serve z. B. in Fernsprechtecb <nik to do with one and the same switching measure Trigger switching operations. Arrangements are known in which two relays are used. Around To further reduce this effort, circuits were developed in which only one relay with several Windings is used. So is z. B. a circuit arrangement is known in which a via a high resistance capacitor permanently connected to a power source by a switching action discharged via a response winding of the relay and after the relay has responded via a changeover contact of this relay is connected to a counter-winding in such a way that that when the switching measure is repeated by the discharge current flowing through the counter winding of the capacitor, the excitation of the holding winding of the relay is compensated. Furthermore is a four-stroke circuit is known, which has a winding, a capacitor and two resistors is working.

The object of the invention is to further improve such circuits in order to provide further application possibilities to tap into. This is achieved according to the invention that with only one Winding constantly in a fault current circuit.

arranged relays by discharging the capacitor as a result of the switching measure is made to respond and held in the fault circuit after the capacitor has discharged and that when repeating the 'switching measure by discharging the reloaded during the hold state Capacitor, the relay is thrown off again.

A particular advantage of such an arrangement

ίο consists in the fact that they are taking even when at rest 'Electricity is. This enables the arrangement to be used as a monitoring device, at which the operational readiness is checked. For example, if you create one resistance in the form of a monitoring lamp or some other display device, this is the Operational readiness of the circuit arrangement marked. Another advantage of the arrangement can be seen in it, that the response of the relay is facilitated by the fact that the fault current of the relay and supports the discharge current of the capacitor. That way will the size of the capacitor and thus also the time constant of the discharge circuit are proportionate kept small, which increases the possible switching frequency and at the same time the costs for the arrangement be lowered. According to a further advantage of the invention, there is no particular one for the relay To switch holding circuit, which leads to a saving of contacts. Finally, the circuit arrangement allows trouble-free switching (no cracking noises) in the event that 'the arrangement used in amplifier systems and the source of spam is used at the same time to generate anode voltage.

The invention will be described in more detail using an exemplary embodiment ^{1 shown in the circuit.}

The winding of relay A is in a fault current circuit:

+, Ri, A, R ₂ , -.

A capacitor C is charged via the resistor R 2:

+ ,. al, R ₃ , C, R2, -.

Is the key T to the winding of ReIaisj4. When the capacitor C is applied, it discharges and the relay A responds, since the charge on the capacitor supports the flow of current in the fault circuit. The relay now remains independent even when the capacitor is empty and the button is released again.

Since the contact I is switched when the relay A is activated, the capacitor C charges in the opposite direction in the following way:

+, Ri, A, C, R ₃ , al, -.

If the same switching action is now carried out by pressing button T , the current in the winding of relay A is weakened by discharging the capacitor C, causing it to drop. The relay remains de-energized even when the capacitor is completely discharged, with the current in the winding then increasing to the old level at the same time. If the T key is released, the capacitor is recharged, as described at the beginning, and the process can begin again.

Via a contact all in this way can any shifts such. B. Switching from one headphone of a magnetic device to another can be made.

Claims (1)

Claim: Circuit arrangement in which a control relay is made to respond by a switching measure with the aid of the discharge current of a capacitor and is made to drop out when it is repeated by the capacitor, which has now been recharged, characterized in that the relay (A ) is made to respond by the discharge of the capacitor (C) resulting from the switching action and is held in the fault circuit after the capacitor has discharged and that when the switching action is repeated, the ¹ relay is thrown off again by discharging the capacitor that was reloaded during the hold state. Referred publications:
German patent specification No. 703 740. 1 sheet of drawings © 509 532 8.55