DE898640C - Tube connection with two or more tubes connected in parallel - Google Patents

Tube connection with two or more tubes connected in parallel

Info

Publication number
DE898640C
DE898640C DES10890D DES0010890D DE898640C DE 898640 C DE898640 C DE 898640C DE S10890 D DES10890 D DE S10890D DE S0010890 D DES0010890 D DE S0010890D DE 898640 C DE898640 C DE 898640C
Authority
DE
Germany
Prior art keywords
parallel
tubes
cathode
tube connection
tube
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
Application number
DES10890D
Other languages
German (de)
Inventor
Franz Feil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DES10890D priority Critical patent/DE898640C/en
Application granted granted Critical
Publication of DE898640C publication Critical patent/DE898640C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Thermistors And Varistors (AREA)

Description

Die Parallelschaltung von zwei oder mehr Röhren wird z. B.. zur Erhöhung der Betriebssicherheit oder der abgebbaren Leistung angewendet. Meist besteht die Forderung, daß die Schaltung auch dann noch bebri,ebs.fähig bleibt, wenn sie nicht mit allen Röhren bestückt eist. Wird bei parallel geschalteten Röhren die Gittervorspannung im Kathodenkreis erzeugt, dann sieht man üblicherweise für jede Röhre einen eigenen, Kathodenwiderstand Rk vor, der durch einen Kondensarbor Ck überbrückt ist. Dies. Ist in Fig. z z. B. für die Parallelschaltung von zwei Röhren gezeigt. Würde die Giittervorspannung durch nur einen Kathodenwiderstand erzeugt werden, dann würde beim Herausnehmen oder beim Ausfall einer Röhre bei der im: Betrieb bleibenden Röhre die Gittervorspannung abnehmen und der Anoden- und Schirmgitterstrom zunehme, so daß die Röhre eventuell überhastet und beschädigt würde. Bei. der Zuordnung eines eigenen Kathodenwiderstandes zu jeder Röhre wird dieser Nachteil zwar vermieden, jedoch isst der Aufwand größer, da jeder Kathodenwiderstand durch einen eigenen Kondensator wechselstTommäßig kurzgeschlossen werden muß. Diese Überbrückungskondensatoren haben eine sehr erhebliche Kapazität, wenn, der Frequenzbereich bis zu tiefen Frequenzen. reicht, und sind dann groß und treuer.The parallel connection of two or more tubes is z. B .. to increase the operational safety or the deliverable power applied. Usually the Requirement that the circuit still be able to be operated, even if it is not equipped with all tubes. If the tubes are connected in parallel, the grid bias generated in the cathode circle, then you usually see a separate tube for each tube, Cathode resistance Rk, which is bridged by a condensate Ck. This. Is in Fig. Z z. B. shown for the parallel connection of two tubes. Would the Gitter bias would then be generated by only one cathode resistor when removing or failing a tube in the case of the tube remaining in operation the grid bias decrease and the anode and screen grid current increase, see above that the tube might be rushed and damaged. At. the assignment of a own cathode resistance to each tube, this disadvantage is avoided, however, the effort is greater because each cathode resistor has its own Capacitor has to be short-circuited alternately. These bypass capacitors have a very significant capacity, though, the frequency range down to low frequencies. enough, and are then big and more loyal.

Erfindungsgemäß genügt es für die parallel geschalteten Röhren, einen einzigen Kathodenwiderstand und Kondensator vorzusehen, wenn man statt eines normalen. stromunabhängigen Widerstandes einen stromabhängigen Widerstand, beipsielsweise einen Heißleiter HL, benutzt, wie es Fig. a zeigt. Die Größe des Kathodenwiderstandes nimmt dann mit abnehmendem Strom zu. Bei geeigneter Charakteristik des Heißleirtersi läßb es sich erreichen, daß sich die Gittervorspannung nur wenig ändert, wenn man eine Röhre herauszieht.According to the invention, it is sufficient for the tubes connected in parallel to provide a single cathode resistor and capacitor, if instead of a normal one. current-independent resistor a current-dependent resistor, for example a thermistor HL, used, as Fig. a shows. The size of the cathode resistance then increases as the current decreases. Given a suitable characteristic of the hot-air circuit, it can be achieved that the grid prestress changes only slightly when a tube is pulled out.

Die Erfindung beschränkt seich nicht auf zwei parallel geschaltete Röhren, sondern ist auch bei der Parallelschaltung von mehr als zwei Röhren anwendbar. Hier ist die Ersparnis an Schaltelementen noch größer.The invention is not limited to two connected in parallel Tubes, but can also be used when connecting more than two tubes in parallel. The savings on switching elements are even greater here.

Claims (1)

PATENTANSPRUCH: Röhrenschaltung mit zwei oder mehr parallel geschalteten; Röhren, bei der die Gittervorspan, nung durch einen Kathodenwiderstand erzeugt wird, dadurch gekennzeichnet, daß dieser Kathoden-,v%derstand, ein stromabhängiger Widerstand, beispielsweise ein Heißleiter ist, der eine solche Charakteristik hat, daß sich die Gittervorspannung beire Herausziehen oder beim Ausfall einer oder mehrerer Röhren nicht wesentlich ändert.PATENT CLAIM: Tube circuit with two or more connected in parallel; Tubes in which the grid prestress is generated by a cathode resistor, characterized in that this cathode, v% derstand, a current-dependent resistor, for example, a thermistor is, which has such a characteristic that the grid prestress when one or more tubes are pulled out or when one or more tubes fail does not change significantly.
DES10890D 1944-01-19 1944-01-19 Tube connection with two or more tubes connected in parallel Expired DE898640C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES10890D DE898640C (en) 1944-01-19 1944-01-19 Tube connection with two or more tubes connected in parallel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES10890D DE898640C (en) 1944-01-19 1944-01-19 Tube connection with two or more tubes connected in parallel

Publications (1)

Publication Number Publication Date
DE898640C true DE898640C (en) 1953-12-03

Family

ID=7473480

Family Applications (1)

Application Number Title Priority Date Filing Date
DES10890D Expired DE898640C (en) 1944-01-19 1944-01-19 Tube connection with two or more tubes connected in parallel

Country Status (1)

Country Link
DE (1) DE898640C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725603A1 (en) * 1987-08-01 1989-02-09 Asea Brown Boveri Grid bias generating circuit for HF amplifier electron tube - has forward polarised, series semiconductor diodes in feed line from negative anode voltage source to tube cathodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725603A1 (en) * 1987-08-01 1989-02-09 Asea Brown Boveri Grid bias generating circuit for HF amplifier electron tube - has forward polarised, series semiconductor diodes in feed line from negative anode voltage source to tube cathodes

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