DE1462247C - Overload protection circuit for amplifiers, especially for remote-fed carrier frequency charge amplifiers - Google Patents
Overload protection circuit for amplifiers, especially for remote-fed carrier frequency charge amplifiersInfo
- Publication number
- DE1462247C DE1462247C DE1462247C DE 1462247 C DE1462247 C DE 1462247C DE 1462247 C DE1462247 C DE 1462247C
- Authority
- DE
- Germany
- Prior art keywords
- remote
- lightning
- amplifiers
- input
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000969 carrier Substances 0.000 title claims 4
- 238000011105 stabilization Methods 0.000 claims 3
- 230000005540 biological transmission Effects 0.000 claims 2
- 239000003990 capacitor Substances 0.000 claims 2
- 239000004020 conductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 230000001264 neutralization Effects 0.000 claims 1
Description
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (1)
FW2, dem eigentlichen Verstärker V und einer Sta- xs Schließt der Blitzableiter BA 2 am Ausgang durch bilisierungsdiode (Zenerdiode) D, die zusammen mit eine Eingangsstörspannung kurz, so muß im ersten einem Kondensator C aus dem Fernspeisegleichstrom Moment ein großer Strom über die Längsinduktivieine stabilisierte Betriebsspannung für den Verstär- täten der Tiefpässe und dem Kondensator C fließen, ker bildet. Die Blitzableiter begrenzen die an den Die Stromänderung in den Längsinduktivitäten L12 Ein- oder Ausgangsklemmen der Schaltung auftre- 20 und L22 induziert dabei eine Spannung zwischen den tenden Beeinflussungsspannungen auf ihrem An- Sternpunkten, die so groß ist, daß sie den Blitzabsprechwert, der z. B. 600 V beträgt. Die Fernspeise- leiter BA 3 zum Ansprechen bringt. Dadurch kann weichen bestehen aus je einem Hochpaß und einem kein Strom durch die Stäbilisierungsschaltung D, C Tiefpaß, die eingangsseitig parallel geschaltet sind fließen. Die beiden Längsinduktivitäten L11 und : und den Fernspeisegleichstrom von dem hochfre- 25 L21 verhindern, daß der Eingang und der Ausgang quenten Nachrichtenband trennen. des Verstärkers über den Blitzableiter BA 3 hoch-Fig. 1 of the drawing shows as an example the block each one capacitance C1 or C2 in the shunt branch. The circuit diagram of a known carrier frequency line star points are amplified by the BA 3 lightning arrester. It consists of two lightning rods tied together. HPl and HP2 represent the high passes of BAl and BA2, two remote feeders FWl and crossovers. Ci
FW 2, the actual amplifier V and a Sta- xs If the lightning arrester BA 2 closes at the output through bilization diode (Zener diode) D, which shorts together with an input interference voltage, then in the first a capacitor C from the remote supply direct current moment a large current must be generated via the series inductive stabilized operating voltage for the amplifiers of the low-pass filters and the capacitor C flow, ker forms. The lightning conductors limit the current change in the series inductances L 12 input or output terminals of the circuit 20 and L 22 induces a voltage between the influencing voltages on their neutral points, which is so large that it exceeds the lightning badge value, the z. B. 600 V. Makes the remote feeder BA 3 respond. As a result, there can be a high-pass filter and a no current flow through the stabilization circuit D, C low-pass filter, which are connected in parallel on the input side. The two series inductances L11 and : and the remote supply direct current from the high-frequency 25 L 21 prevent the input and output from separating the frequent message band. of the amplifier via the BA 3 lightning rod.
es vorkommen, daß diese über die Eingangsweiche ;
FWl, die Stabilisierungsschaltung D, C und die Aus- Patentanspruch
gangsweiche FW 2 den Blitzableiter BA 2 am Aus- 30 gang vor dem Blitzableiter BA1 am Eingang, und Überlastungsschutzschaltung für Verstärker, zwar infolge ihrer nicht genau übereinstimmenden insbesondere für ferngespeiste Trägerfrequenz-Ansprechspannung zum Ansprechen bringen. Schließt Leitungsverstärker, dadurch gekennzeichder BlitzableiterBA2 am Ausgang infolge der Stör- net, daß die Tiefpässe in den Fernspeiseweichen spannung am Eingang kurz, so fließen während der 35 jeweils als T-Glied ausgeführt und ihre Stern-Blitzdauer ganz große Ströme über die Stabilisie- punkte durch einen Blitzableiter verbunden sind.If interference voltages occur at the input, it can be short-circuited frequently,
it can happen that this over the entrance switch ;
FWl, the stabilization circuit D, C and the patent claim
Soft FW 2 the lightning arrester BA 2 at the output 30 before the lightning arrester BA1 at the input, and overload protection circuit for amplifiers, because of their not exactly matching, especially for remote-fed carrier frequency response voltage to respond. If the line amplifier , characterized by the BA2 lightning arrester, closes at the output as a result of the interference that the low-pass filters in the remote feeder voltage at the input shortens, then during the 35 in each case designed as a T-element and their star-lightning duration, very large currents flow through the stabilization points connected by a lightning rod.
Family
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