Bidirectional, DC-isolated transmission channel
AssigneePhoenix Contact GmbH & Co. KG
InventorsJoerg Blanke, Heinz-Wilhelm Meier
Life of this patent
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Abstract
Arrangement and method for electrically isolated transmission of direct-current and alternating-current signals. The signals can be transmitted in both directions via the same and only DC-isolated channel. The arrangement comprises a first transmit-and-receive system (1), a direct-current transmitter (4) in short-circuit mode, an operational amplifier arrangement (5), and a second transmit-and-receive system (2) with a message signal transmitter (9).
Claims18
Arrangement for electrically isolated transmission of direct-current and alternating-current signals between a first transmit-and-receive system (1) and a second transmit-and-receive system (2), comprising:
- sections of transmit-and-receive conductor pairs (6a, 6b;
- 7a, 7b;
- 8a, 8b), which connect the two transmit-and-receive systems (1, 2) via a single two-conductor channel;
- a direct-current transmitter (4) including an isolating converter (3) with a primary circuit (45) and a secondary circuit (46), which is short-circuited for the signal transmission with direct-current signals (IN1, IN2), wherein the direct-current transmitter (4) converts direct-current signals (IN1) into alternating-current signals and these back into direct-current signals (IN2) for DC isolation of the conductor sections;
- an electronic I/I or I/U converter (5), on whose input side the signals transmitted via the channel are applied and on whose output side usable signals are output as current or voltage signals to the second transmit-and-receive system (2);
- and
- a message signal transmitter (9), which is connected on the secondary side to the direct-current transmitter (4) for the transmission of the message signal (U2), so that, on the primary side, a change in voltage can be determined, which can be evaluated by the first transmit-and-receive system (1) as the transmitting message signal.
Method for the electrically isolated transmission of direct-current and alternating-current signals between a first transmit-and-receive system (1) and a second transmit-and-receive system (2), the method comprising:
- a) obtaining measurement signals in the first transmit-and-receive system (1), which measurement signals are prepared as direct-current or alternating-current signals for transmission via a two-conductor channel, which has sections that are DC-isolated from each other;
- b) feeding the direct-current and alternating-current signals to an electronic I/I or I/U converter (5) via the two-conductor channel under use of a direct-current transmitter (4) with the isolating converter (3);
- c) recovering, at the electronic I/I or I/U converter (5), a current or voltage signal corresponding to the measurement signal from the direct-current and alternating-current signals and making the current or voltage signal available to the second transmit-and-receive system (2);
- and
- d) in the case of the transmission of a message signal to the first transmit-and-receive system (1) from the second transmit-and-receive system (2), feeding the message signal to the secondary circuit (46) of the direct-current transmitter (4) and supplying the message signal via the primary circuit (45) to the first transmit-and-receive system (1).
Dependencies are inferred from the claim text.