DE2160330A1 - ELECTRONIC SWITCH - Google Patents

Description

Electronic push button switch.

The invention relates to an electronic key switch, which in his Use in all areas of switching in electrical, especially electronic Plants painted over.

Although technically feasible, no attempt has been made to use electronic To build switches which could fulfill their function without external operating voltage was due to the fact that the working voltage was always present, and thus a separate power supply had to be used with the circuits used up to now A separation of the control circuit from the circuit was made exclusively by relay contacts Pollution, contact smell as well as corfact fire with sometimes dangerous and costly consequences were possible.

With control circuits which contain a thyristor instead of the relay, Badurften an isolating transformer between the control part and the circuit.

In each case four lines were necessary: Two wires for the Operating voltage of the control unit, as well as two wires for the load circuit The control, if it was done by human hands always consisted of bridging at least two Contacts via buttons or finger surface. The disadvantages of mechanical buttons are well known.

When all of these aspects were taken into account, the cost of materials appeared as well as the associated high price disadvantageous.

The invention is based on the object of eliminating ob.gen.iViachteile.

The following points had to be taken into account: a.) Elimination of additional Operating voltages b.) Replacement of the mechanical key by electronic keying c.) Replacement of mechanical contacts in the load circuit.

The overall function of the arrangement should therefore be absolutely contactless work and in addition, due to the lack of additional voltages, with other switches compatible, replace the same.

The tasks set by Dip are solved as follows: At rest the arrangement is at points 4 and 5 by the bridge rectifier G1 Neutralized operating voltage. The transistor T i is therefore initially on a Resistor R3 connected to this voltage while transistor T2 is connected directly to point 4 Without control, only a small residual current flows through the collector-emitter path from T1 and T2 which on the one hand is derived from resistor R2, on the other hand not sufficient to ignite thyristor Th.

Electrical push button switch.

Due to the present emitter follower circuit, the base is from T1 extremely high resistance. This fact allows the use of those in the vicinity AC fields, as well as static charges, which are on the body of the DEVELOP OPERATORS A light touch of the labeling plate (1) generates the, by the housing (2) insulated base plate (3) positive pulses, which in turn lead to the connection of the transistors T1 and T2. The thyristor (Th) is triggered and switches the load circuit. Pure DC voltage is applied to connections (o) and (7) , the thyristor remains in the switched-on state.

Is it a periodic DC voltage or AC voltage, the circuit works as a momentary switch, i.e. it holds the switching state until zero passage falls below the holding current.

The base resistor (R1) serves as a current limiter on the input side, while capacitor (C1) dissipates steep-sided interference peaks.

if the switch is conductive, the operating voltage is of course missing Control circuit whose presence at the time can be disregarded.

The switching status can be deleted by interrupting the load circuit or, by means of a G-reloading function, electronically by means of a second arrangement of the electronic pushbutton switch.

Due to the extensive compatibility with conventional switching devices the invention constitutes a real advance in the field of electrical switching processes the arrangement described is not based on individual parts of the illustrated in the drawing Embodiment limited. Rather, these parts can be due to different Working conditions can be changed or left out without the scope of the invention to leave.

Claims (4)

PATENT CLAIMS Electronic push button switch. 9) EIel <tronic load switch, characterized in that the Arrangement of an electrical switching process including its triggering without exception without moving contacts, as well as being able to increase without additional operating voltage. Touching the metal label plate (1) with your fingers will an impulse is applied to the base plate (3) located behind it, which is thereby insulated from the housing (2) given to the first transistor (T1) of a single or multiple emitter follower, which in turn controls the gate of the thyristor (Th), which is connected to it via a bridge rectifier (gel) neutralized switching voltage which, in turn, is necessary before the switching process Provides operating voltage of the arrangement. In the case of low-voltage plans, the control is isolated the housing (2) is not required. The anode (4) and cathode (5) of the thyristor (Th) are led out, external influencing of the switching state (deletion of the holding current) e.g. by means of To enable capacity reloading by a second electronic pushbutton switch. 2.) Electronic push button switch according to claim 1, characterized in that Then the switching command by touching one of the rest of the switching arrangement given the separated metal plate (1), and as a result a galvanic separation of the operator is enabled by the circuit. 3.) Electronic push button switch according to claim 1, characterized in that that the required high resistance of the input circuit is achieved in that the last transistor of the emitter follower cascade directly at the gate of the thyristor which in turn is very high resistance. 4 Electronic push button switch according to claim 1, characterized in that diR does not require a separate operating voltage by adding the same to the one to be switched Circle is taken Blank page