GB1062119A - Coupling device for protecting electrical components from excessive voltage levels - Google Patents

Coupling device for protecting electrical components from excessive voltage levels

Info

Publication number
GB1062119A
GB1062119A GB2409164A GB2409164A GB1062119A GB 1062119 A GB1062119 A GB 1062119A GB 2409164 A GB2409164 A GB 2409164A GB 2409164 A GB2409164 A GB 2409164A GB 1062119 A GB1062119 A GB 1062119A
Authority
GB
United Kingdom
Prior art keywords
diode
crg
transistor
crs
transmitter
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
GB2409164A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1062119A publication Critical patent/GB1062119A/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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/191—Tuned amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

1,062,119. Protective cut-out systems. COMPAGNIE FRANCAISE THOMSON - HOUSTON-HOTCHKISS BRANDT. June 10, 1964 [June 11, 1963], No. 24091/64. Heading H2K. [Also in Division H4] In an arrangement for protecting electrical apparatus, from excessive input voltages, two different types of semi-conductor diode each having a different conductivity threshold are connected in the input circuit of the device to be protected in such manner that a first diode is normally conducting but the occurrence of an excessive input voltage causes the second diode to conduct and generate a bias voltage to block the first diode. As described, the arrangement protects the input transistor of a portable transmitter-receiver during transmission and may also serve to protect a radio receiver situated in the vicinity of a highpower transmitter. In Fig. 1 a transmitter includes a transistor Q1 and tuned circuit C1, L1 feeding via lead J1 an aerial common to the transmitter and receiver. The receiver includes an R.F. amplifier comprising transistor Q2 and tuned circuit C2, L2, the apparatus being controlled by a send-receive switch I controlling also the power supply S1. A germanium diode CRG serves as a coupling and switching element in the protective device and a silicon diode CRS, having a higher conductivity threshold than diode CRG, acts as a control element for CRG. In the receive position the collector current of transistor Q2, supplied via resistor R1 and choke L3, renders diode CRG conductive to connect the aerial to the receiver R.F. stage, the diode CRS remaining non-conductive. With the transmitter in operation the transistor Q2 is not energized and no D.C. voltage is supplied to the diodes CRG, CRS. The transmitted signal is supplied to the diodes CRG, CRS, respectively, via tappings P1, P2 which are arranged so that a lower voltage is applied to the diode CRG than to the diode CRS. For signals of low amplitude neither of the diodes conducts and no signal reaches the base of the transistor Q2. For medium amplitude signals the diode CRG commences to conduct and if the signal amplitude continues to increase the diode CRS conducts and capacitor C3 is charged thus biasing diode CRG until it becomes non-conductive and the transistor Q2 is completely isolated. The diode CRG may be fed with a neutrodyning voltage to reduce the effects of its capacitance.
GB2409164A 1963-06-11 1964-06-10 Coupling device for protecting electrical components from excessive voltage levels Expired GB1062119A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR937662A FR1367612A (en) 1963-06-11 1963-06-11 Improvements to protective devices

Publications (1)

Publication Number Publication Date
GB1062119A true GB1062119A (en) 1967-03-15

Family

ID=8805754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2409164A Expired GB1062119A (en) 1963-06-11 1964-06-10 Coupling device for protecting electrical components from excessive voltage levels

Country Status (4)

Country Link
DE (1) DE1276759B (en)
FR (1) FR1367612A (en)
GB (1) GB1062119A (en)
NL (1) NL146350B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304241A (en) * 1983-08-09 1997-03-12 British Aerospace Electromagnetic interference protection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789218A (en) * 1952-11-13 1957-04-16 Underwood Corp Width control apparatus
DE1139572B (en) * 1961-03-18 1962-11-15 Elektronisches Entwicklungsins Protection device for the inputs and / or outputs of electrical, especially electronic, devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304241A (en) * 1983-08-09 1997-03-12 British Aerospace Electromagnetic interference protection
GB2304241B (en) * 1983-08-09 1997-06-18 British Aerospace Electromagnetic interference protection

Also Published As

Publication number Publication date
NL6406612A (en) 1964-12-14
DE1276759B (en) 1968-09-05
NL146350B (en) 1975-06-16
FR1367612A (en) 1964-07-24

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