US2022406A - Protective device in amplifier circuit - Google Patents

Protective device in amplifier circuit Download PDF

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Publication number
US2022406A
US2022406A US549184A US54918431A US2022406A US 2022406 A US2022406 A US 2022406A US 549184 A US549184 A US 549184A US 54918431 A US54918431 A US 54918431A US 2022406 A US2022406 A US 2022406A
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US
United States
Prior art keywords
circuit
grid
amplifier circuit
tube
protective
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 - Lifetime
Application number
US549184A
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English (en)
Inventor
Jr Joseph Francis Cook
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to US549184A priority Critical patent/US2022406A/en
Priority to FR739733D priority patent/FR739733A/fr
Application granted granted Critical
Publication of US2022406A publication Critical patent/US2022406A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03F1/548—Protection of anode or grid circuit against overload

Definitions

  • This invention relates to an improved amplifier circuit, and more particularly to improvements in power amplifier circuits.
  • the object of the invention is to provide a proper means of protecting a power amplifier circuit from building up high frequency, high voltage surges which build up in the plate and grid circuits of amplifiers.
  • Another object of this invention is to provide adequate protection to the apparatus used in an amplifier circuit such as transformer windings, local wiring, etc.
  • the present invention is of particularly great importance in large power amplifier circuits, for the reason that interruption of service in such cases usually affects a large group of users.
  • the invention consists of placing a neon lamp or other gas discharge tube in an amplifier circuit in such a manner that if a surge or oscillation is set up in the circuit to be protected,- such surges and oscillations are suppressed thus preventing the building up of surges which are liable to result in damage to the transformer windings, and the associated wiring.
  • the magnitude of the charge around the grid varies directly with the pressure of internal gases existing for any reason.
  • the frequency of oscillations or motor-boating is probably controlled gas pressure, internal interelectrical capacities and external circuit constants.
  • the present invention is adapted to eliminate v ltages resulting from any cause, which would 2 greater than the negative bias on the grid of tube.
  • the invenn provides a neon tube having a normal b: akdown voltage not greater than 110 percent the grid bias at which the tube is working connected in the circuit so that the grid voltage is not impressed on the gas discharge tube.
  • the protective device may be placed in the plate circuit, however, a more effective protection of the circuit is obtained when the neon tube is placed in the grid circuit, than when placed in the plate circuit, although the higher the plate circuit impedance, the more effective the protective gas discharge tube becomes.
  • FIG. 1 is a portion of an amplifier circuit in which in accordance with the invention protective lamps are provided;
  • Figure 2 is a. plan view of a convenient mounting of a pair of protective lamps.
  • Figure 3 is an end View of the mounting shown in Figure 2.
  • a pair of space discharge tubes 5, 6 are shown connected in push-pull.
  • Each of tubes 6, 6 includes a grid element 7, an anode 8 and a cathode 9.
  • the output circuit of the pushpull arrangement includes an output transformer II, the secondary of which is provided with taps l2, l3 and M for obtaining various impedance values.
  • the input circuit of the push-pull arrangement includes an input transformer 5 across the secondary of which there is connected in accordance with the present invention a pair of protective lamps or neon tubes 3, 3 in series, the common point of which is grounded at H).
  • the various anode, cathode and biasing sources have been purposely omitted in the drawing in order to more clearly present the invention.
  • two protective lamps or neon tubes 3, 3 are shown mounted in standard sockets 2, 2.
  • the sockets are of well known construction and are adapted to be mounted on the upright portion of an L frame I which may be suitably held in position by screws or rivets adapted to be passed through holes l5, in the base plate of frame I.
  • Suitable leads 4, 4 are provided for the various connections to the tube sockets.
  • a space discharge device having an input circuit and an output circuit, grid biasing means in said input circuit, circuit protective means comprising gas discharge means connected across said input circ it, said means being adaped to suppress volt in said system greater than the n the input of the space discharge device.
  • circuit protective means comprising a gas discharge path connected eifectively across the input circuit, said path being adapted to discharge at a slightly greater potential than the bias potential applied to said devices whereby said system is protected from high voltage surges.
  • means for protecting the amplifier and associated circuits and elements from the effects of abnormally high voltage surges and the like which comprise a normally non-conductive electrical path shunted across the input circuit, said path having a pre determined breakdown voltage and being arranged so as to by-pass damaging high voltage surges when the voltage surges exceed a predetermined value to thereby prevent such voltage surges from passing through the portions of the amplifying system liable to be damaged, the normally non-conductive electrical path being adapted to breakdown at a voltage which is slightly greater than the biasing voltage of the discharge device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
US549184A 1931-07-07 1931-07-07 Protective device in amplifier circuit Expired - Lifetime US2022406A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US549184A US2022406A (en) 1931-07-07 1931-07-07 Protective device in amplifier circuit
FR739733D FR739733A (fr) 1931-07-07 1932-07-07 Perfectionnements aux systèmes amplificateurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US549184A US2022406A (en) 1931-07-07 1931-07-07 Protective device in amplifier circuit

Publications (1)

Publication Number Publication Date
US2022406A true US2022406A (en) 1935-11-26

Family

ID=24191982

Family Applications (1)

Application Number Title Priority Date Filing Date
US549184A Expired - Lifetime US2022406A (en) 1931-07-07 1931-07-07 Protective device in amplifier circuit

Country Status (2)

Country Link
US (1) US2022406A (fr)
FR (1) FR739733A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654857A (en) * 1949-10-27 1953-10-06 Finkel Julius Antenna accessory
US2871410A (en) * 1957-06-24 1959-01-27 Elox Corp Michigan Electrical discharge machining watchdog circuit
US3740686A (en) * 1970-06-25 1973-06-19 Itt Ignition device for high pressure discharge lamps

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654857A (en) * 1949-10-27 1953-10-06 Finkel Julius Antenna accessory
US2871410A (en) * 1957-06-24 1959-01-27 Elox Corp Michigan Electrical discharge machining watchdog circuit
US3740686A (en) * 1970-06-25 1973-06-19 Itt Ignition device for high pressure discharge lamps

Also Published As

Publication number Publication date
FR739733A (fr) 1933-01-16

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