DE2055142B2 - Circuit arrangement for receiving remote control signals superimposed on a heavy current network, in particular for ripple control systems - Google Patents

Abstract

The receiver, for pulse-coded remote control signals passing via a power distribution network, has two relays (R, R') with independently adjustable response thresholds. The contact (r) of one relay (R) switches the synchronous selector and the contact (r') of the other relay switches the instruction release associated with the selector. The first relay is located in the collector circuit of a directional amplifier (T) and the scone relay in that of an additional transistor (T1) whose base is coupled to the directional amplifier. The advantage lies in the receiver not responding to interference pulses and thereby causing unwanted switching.

Description

35

The invention relates to a circuit arrangement for receiving superimposed power systems Remote control signals according to the time interval method, which with the help of an electrical band filter sifted out from the power network and preferably a sensitive relay via a directional amplifier are supplied, the contact of which sets a synchronous selector in motion after a start pulse as the command trigger also switches the circuits assigned to them (see e.g. electrical engineering pocket book, Vol. 3, published by E. Philippon, VEB Verlag Technik, Berlin, 1969, pp. 1048 and 1049).

With the time interval method, two types of impulses are transmitted to the ripple control receiver, namely a start pulse and one or more time-interval coded command pulses. Possibly Interfering impulses that occur can, for example, put ripple control receivers into operation or when they are already in Operational receivers trigger incorrect switching. Glitches can therefore lead to different Impact.

The invention is based on the object of designing the circuit arrangement such that possibly Interfering impulses that occur can practically not cause any incorrect switching.

This object is achieved according to the invention in a circuit arrangement of the type mentioned at the outset solved that two relays are provided whose response level can be set independently of each other, whereby the contact of one relay is synchro- b5 ler and the contact of the other relay, the circuits of the command trigger assigned to the synchronous selector switches.

The invention is illustrated by means of the drawing, in which an exemplary embodiment is shown schematically explained in more detail

The drawing shows in principle a ripple control receiver in which command pulses assigned to a start pulse are processed by means of a synchronous selector (decoder). Ph the connection to a phase conductor with 0 is the connection to a neutral conductor of a power network referred to low voltage supply of the receiver is a transformer U, which is the primary side Ph and connected to the power terminals 0 The secondary winding is connected to a rectifier GR, downstream the Arrangement supplied with direct current A capacitor CA is used to smooth the direct voltage.

On the secondary winding of the transformer U is a motor M, which is used to drive a decoder. In the illustrated embodiment, the motor M is to rotate continuously and drive a disk, not shown in the drawing, with which when a start pulse is received with the help of a coupling magnet KM Shift arm is coupled. As it rotates, the switching arm actuates contacts me I, ma I, me 2, ma 2 which are assigned to one another and which are in the circuit of the command trigger PRi, PR 2 . The me contacts are switch-on contacts and the ma contacts are switch-off contacts. In the exemplary embodiment shown, the command triggers are polarized relays with two windings connected in opposite directions. The command triggers PR switch the assigned power contacts Ik, which switch the loads on and off.

With the help of a band filter BF , the audio frequency voltage superimposed on the power system is filtered out. For this purpose, the primary winding of the band filter BF is connected to the mains terminals Ph and 0 via a capacitor Cl. A capacitor C 2 is located in the secondary circuit of the band filter BF . The primary and secondary side of the band filter ÄF are preferably designed symmetrically, the band-pass filter circuits being loosely inductively coupled to one another. With the help of a tap on the secondary winding of the band filter, the filtered audio frequency voltage is coupled to a directional amplifier, which consists of a transistor T and an emitter negative feedback resistor R 1 of the amplifier compensates for that of the band filter in the pass band. In the collector circuit of the transistor Γ there is a resistor R 3 and a sensitive relay (comb relay) R through which the amplified, audio-frequency half-wave current flows. The winding inductance of the relay has a differentiating effect on the current function. A capacitor Ci, which is designed so that excessive voltage peaks cannot occur, is therefore parallel to the relay. Since the amplifier determines the current in the relay, fluctuations in the DC voltage supply do not affect the response value from the relay. The response level of the relay R can be set with the aid of the resistor R 1. The contact r of the relay R is assigned to the circuits of the command trigger PR

As can be seen from the drawing, the coupling magnet KM is actuated via a contact r ' , which is assigned to a relay R' . The relay R '

lies in the collector-emitter circuit of a transistor Ti. The emitter is connected to voltage via a resistor A4. The base of the transistor Ti is connected to the voltage between the relay R and the resistor R 3. The response level of the relay R ' can also be set with the aid of the resistor R 4 . Because the response level can be set separately for the start and for the command transmission, faults can be assessed differently from case to case and thus rendered ineffective.

The audio frequency signal filtered out of the network by the band filter BF thus causes the relays R and R 'to respond via the directional amplifier, whereby the relay contacts r and r' are closed. As a result, the coupling magnet KM is excited and the switching arm is taken along by the motor M for one revolution. After covering a given distance, the

Contacts me, ma closed briefly one after the other. If, for example, when the contact me I is closed, a command pulse arrives at the same time, which is also given via the directional amplifier and relay, the circuit is closed via r , so that the polarized relay PR i is thrown into the other position.

The coupling magnetic KM, at each closing of the contact r 'on voltage is applied in order at the de-energizing of the coupling magnet KM to r' to prevent a break sparks, a deletion combination is provided which consists of a resistor R 2 and a capacitor C5

In the case of ripple control receivers that do not have a coupling magnet but work according to the »start-stop principle«, the contact r 'of the relay R' is conveniently in the circuit of the motor M.

1 sheet of drawings

Claims (3)

Patent claims: 1.Circuit arrangement for receiving remote control signals superimposed on a high voltage network according to the time interval method, which are screened out from the high voltage network with the help of an electrical band filter and preferably fed via a directional amplifier to a sensitive relay, the contact of which sets a synchronous selector in motion after a start pulse as well as the The command trigger switches these associated circuits, characterized in that two relays (R, R ') are provided, the response level of which can be set independently of one another, the contact (τ) of one relay (R) being the synchronous selector and the contact (r ¹ ) the other of the relay (R ') a \ e switches the circuits of the command trigger (PR \, PR 2) assigned to the synchronous selector 2. Circuit arrangement according to claim 1, characterized in that one relay (R) is in the collector circuit of the directional amplifier (transistor T) , while the second relay (R ') is in the collector circuit of an additional transistor (Tl) , which has its base on Collector circuit of the directional amplifier (transistor 7) is connected 3. Circuit arrangement according to claim 1 or 2, characterized in that adjustable resistors (R I ₁ R 4) are provided for setting the response level of the two relays (R, R ') , which are in the base-emitter circuit of the transistors (T, T) lie.