H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/50 (2006.01) G08C 19/02 (2006.01) H04B 3/54 (2006.01)
Patent
CA 2281156
In an assembly for signal transfer between a receiving station (10) and a transmitting station (12) as well as for power supply of the transmitting station (12) in which these two stations are connected to each other via a two-wire line (14), an analog signal current variable between two limiting values is transmitted via this two-wire line, this signal current representing a measured value sensed by a sensor in the transmitting station (12). This current forms at the same time the supply current needed to operate the transmitting station (12). In the transmitting station (12) a circuit (24) is provided, generating a constant operating voltage for the transmitting station, the transmitting station including a controllable current source (34) which dictates the current flowing via the two-wire line (14) as a function of the measured value and which is fed from a supply voltage source (18) in the receiving station (10). The current regulator (34) is a series current regulator fed from the supply voltage source (18) in the receiving station (10). A charge pump (38) is connected to the output of the current source (34), the charge pump generating from the voltage appearing at the output of the current source (34) the operating voltage needed for operating the sensor (20) and a signal processing circuit (22) connected thereto. A parallel regulator (40, 42) for maintaining the input voltage or respectively the output voltage of the charge pump (38) constant is connected to the input and output respectively of the charge pump (38). Fig. 2
Lalla Robert
Schreiber Ronald
Endress + Hauser Gmbh + Co.
Fetherstonhaugh & Co.
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