The invention relates to a method for signal transmission between a first and a second system (S1, S2) that are interconnected by means of a current loop (L). A direct current signal is transmitted in a first frequency range (AB) and an alternating current signal in a second frequency range (DB) via the current loop (L). The direct current signal and the alternating current signal are superimposed, the alternating current signal being used for digital signal transmission and the direct current signal being used for analog signal transmission. A control unit (CPU) produces a first data flow (U1) in which the direct current signal and the alternating current signal to be adjusted in the control loop (L) are digitally encoded, the first data flow (U1) being transmitted to a current output circuit (S), and the transmitted first data flow (U1) being converted into a current signal by the current output circuit (S), the current signal consisting of the superimposed direct current signal and alternating current signal, or the current output circuit (S) converts the transmitted first data flow (U1) into the direct current signal and the alternating current signal. The current signal or the direct current signal and alternating current signal are adjusted in the current loop (L).

Method and circuit for signal transmission via a current loop

The method involves generating a data stream by a control unit, and digitally encrypting direct current (DC) signal and an alternating current (AC) signal in the control unit. The data stream is transmitted to a power output circuit, and the transmitted data stream is converted into the current signal by a current output circuit. The transmitted data stream is converted into the DC signal and the AC signal by the power output circuit. The current signal, the DC signal and the AC signal are adjusted in a current loop (L). An independent claim is also included for an electrical and/or electronic switch for signal transmission between process control systems.

Method for signal transmission between process control systems of e.g. field device for detecting process variable in process automation industry, involves adjusting direct current signal and alternating current signal in current loop

Die Erfindung betrifft eine Stromausgangsstufe (100), welche einen Eingang (IN), einen Ausgang (OUT) zur Verbindung mit einem Eingang einer mit Strom zu versorgenden Einheit (200), eine Regelstufe (T1, T2, Z1), die den Ausgangsstrom (Iout) einstellt und eine Energieversorgungsstufe (Uv; Uv, –Uv), welche Energie fur den Ausgangsstrom (Iout) zur Verfugung stellen kann aufweist. Die Stromausgangsstufe (100) weist einen ersten Transistor (T1) auf, der den Ausgangsstrom im passiven Betriebsfall regelt und die Stromausgangsstufe (100) enthalt einen zweiten Transistor (T2; T2, T3), der den Ausgangsstrom (Iout) im aktiven Betriebsfall regelt, wobei der erste Transistor (T1) und der zweite Transistor (T2, T2, T3) von einer Regelstufe (OP1) gesteuert wird, und wobei im aktiven Betriebsfall die Energieversorgungsstufe (Uv; Uv, –Uv) so gesteuert wird, dass sie Energie fur den Ausgangsstrom (Iout) zur Verfugung stellt.

Stromausgangsstufe mit automatischer aktiv-passiv Umschaltung

The utility model relates to an isolated AC-DC signal two-way transmission circuit. A first standard DC signal or a first AC signal superimposed on the first standard DC signal which is outputted by first AC/DC electrical signal sending and receiving equipment is converted to an AC signal through a primary circuit of an DC-to-AC conversion circuit; through isolated transmission to a secondary circuit, the AC signal is converted to a second standard DC signal corresponding to the first standard DC signal or a signal which is superimposed on the second standard DC signal and is corresponding to the first AC signal to be outputted; the second standard AC signal or the signal superimposed on the second standard DC signal and corresponding to the first AC signal is converted through a current or voltage conversion circuit to a corresponding voltage or current signal which is transmitted to second AC/DC electrical signal sending and receiving equipment to complete the transmission; and a second AC signal generated by the second AC/DC electrical sending and receiving equipment is transmitted in an isolated mode through an independent AC signal transmission circuit and converted to a feedback signal superimposed on the standard DC signal, and the feedback signal is transmitted to the first AC/DC electrical signal sending and receiving equipment. Anti-interference ability and reliability of two-way transmission are strengthened.

Isolated AC-DC signal two-way transmission circuit

FIELD: data transmission means.SUBSTANCE: disclosed is a data transmission device with galvanic isolation using a pulse transformer, comprising an input Schmitt trigger with a paraphrase output, four univibrators, two buffer amplifiers with output to the transformer, at the output of the transformer there is a differential amplifier, two comparators, an RS-trigger and an output buffer amplifier.EFFECT: high noise-immunity, unambiguous recovery of the shape of the original signal, reduced intersymbol interference.4 cl, 6 dwg

Data transmission device with galvanic isolation by means of pulse transformer

Arrangement and method for the electrically isolated transmission of DC and AC signals. The signals can be transmitted in both directions using the same and only available DC-isolated channel. The arrangement comprises a first transmission and reception system (1), a DC transformer (4) in shorted mode, an operation amplifier arrangement (5) and a second transmission and reception system (2) with an event signal generator (9).

Bidirectional, DC-isolated transmission channel

Anordnung und Verfahren zur potentialgetrennten Ubertragung von Gleich- und Wechselstromsignalen. Die Signale konnen in beide Richtungen uber den gleichen und einzig vorhandenen galvanisch getrennten Kanal ubertragen werden. Die Anordnung umfasst ein erstes Sende- und Empfangssystem (1), einen Stromwandler (4) im Kurzschlussbetrieb, eine Operationsverstarkeranordnung (5) und ein zweites Sende- und Empfangssystem (2) mit Meldesignalgeber (9).

Bidirektionaler, galvanisch getrennter Übertragungskanal

FIELD: electricity ^ SUBSTANCE: device includes the first transceiving system (1), DC transmitter (4) in short-circuit mode, operating amplification device (5) and second transceiving system (2) with sensor (9) of information signal ^ EFFECT: possibility of simultaneous bidirectional transfer of signals from two transceiving systems ^ 18 cl, 10 dwg

Blanke Joerg

Papers

Bidirectional, DC-isolated transmission channel

Bidirektionaler, galvanisch getrennter Übertragungskanal

Bidirectional galvanically isolated channel of transmission