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公开(公告)号：CA1035837A
公开(公告)日：1978-08-01
申请号：CA218475
申请日：1975-01-23
Applicant: CIT ALCATEL
Inventor： MIGEON RENE , LEGRAND YVES
Abstract: 1461235 Automatic current control COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 23 Jan 1975 [24 Jan 1974] 2933/75 Heading G3R A series transistor current regulator includes a current sensing resistor and a constant voltage diode supplied with stabilized current from a resistor network. The diode is connected to the base of the series transistor through the basecollector path of a second transistor and a second constant voltage diode. The base-emitter junction of a third transistor is connected across the series connection of the current sensing resistor and the first diode. As shown, a two-terminal network 2 is connected between a D.C. source 1 and a resistive load 3 in a repeatered telecommunications line. The current is sensed by a resistor 5, the potential across which controls the conductivity of a transistor 12, which in turn controls series transistor 4. A reference potential is provided by a Zener diode 10 which receives a constant current supply from a transistor 9, resistors 7, 11, 13, 14 and a second Zener diode 8. A parallel resistor 6 limits the power dissipated in the series transistor 4, and a pair of Zener diodes 17, 18 limit the total voltage across the network 2. Diodes 15, 16 provide temperature compensation. If a high supply voltage and/or low resistance load are used, several networks of the illustrated.type may be connected in series.
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公开(公告)号：DE2751286A1
公开(公告)日：1978-07-27
申请号：DE2751286
申请日：1977-11-16
Applicant: CIT ALCATEL
Inventor： MARCHASSON BERNARD , MIGEON RENE
Abstract: The present invention concerns the transmission of information, and consists in a continuous regulator responsive to the amplitude of a pilot tone included in the signal whose level is to be regulated, including a variable-gain quadripole through which said signal is passed, an automatic gain control loop including a circuit controlling the gain of the quadripole, and an auxiliary feedback loop through which the control circuit also controls the automatic gain control loop. The regulator is applicable with advantage to transmission systems.
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公开(公告)号：FR2371827A1
公开(公告)日：1978-06-16
申请号：FR7635218
申请日：1976-11-23
Applicant: CIT ALCATEL
Inventor： MARCHASSON BERNARD , MIGEON RENE
IPC: H04B3/10
Abstract: The present invention concerns the transmission of information, and consists in a continuous regulator responsive to the amplitude of a pilot tone included in the signal whose level is to be regulated, including a variable-gain quadripole through which said signal is passed, an automatic gain control loop including a circuit controlling the gain of the quadripole, and an auxiliary feedback loop through which the control circuit also controls the automatic gain control loop. The regulator is applicable with advantage to transmission systems.
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公开(公告)号：FR2359532A1
公开(公告)日：1978-02-17
申请号：FR7622106
申请日：1976-07-20
Applicant: CIT ALCATEL
Inventor： LEGRAND YVES , MIGEON RENE
Abstract: The circuit provides protection for leads which are balanced about a potential referenced to earth. The circuit normally is required when the load impedance to earth varies due to component failure. The circuit is connected in parallel across the load d. c. supply (1, 2) and consists of a zener diode (11) and power transistor (3) in series between the positive and negative supply rails. The transistor is driven from an amplifying transistor (4) both being connected as a Darlington pair. The Darlington pair is controlled from a pilot circuit sensitive to both positive and negative rail variations about earh (6). Variations are detected on two Zener diodes (5, 8) whose common point is grounded, the remainder of the chain consisting of a transistor-resistor-diode combination between the two supply rails.
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