GB1387386A - Protection circuits for transistor circuits - Google Patents

Protection circuits for transistor circuits

Info

Publication number
GB1387386A
GB1387386A GB1712373A GB1712373A GB1387386A GB 1387386 A GB1387386 A GB 1387386A GB 1712373 A GB1712373 A GB 1712373A GB 1712373 A GB1712373 A GB 1712373A GB 1387386 A GB1387386 A GB 1387386A
Authority
GB
United Kingdom
Prior art keywords
circuit
stable
transistor
amplifier
input
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
GB1712373A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1387386A publication Critical patent/GB1387386A/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
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Electronic Switches (AREA)

Abstract

1387386 Overload protection of transistors INTERNATIONAL STANDARD ELECTRIC CORP 10 April 1973 [11 April 1972] 17123/73 Heading H3T [Also in Division H2] A protective arrangement A for a transistorized circuit B comprises a normally non- conducting transistor T1 whose base is connected to a resistor R1 through which flows the supply current to the circuit B, and two gates S1, S2 forming a bi-stable circuit with two outputs, which bi-stable circuit changes its state when the transistor is rendered conducting by the voltage arising across the resistor R1 when a current surge occurs, one bi-stable output disabling the protected circuit B and the other providing an alarm signal. The circuit B may be an amplifier with an input at I and controlling a relay C. The bi-stable circuit may comprise two DTL gates P1, P2 connected so as to cut off the supply to the first transistor of the amplifier in circuit B when the bi-stable circuit changes its state. The output S2 from the gate P2 provides the alarm signal and the gate P1 is connected to the input I so that a short pulse applied to the input may restore the bi-stable circuit to its initial condition and render the amplifier operative. Fig. 2 (not shown) illustrates an arrangement in which the amplifier includes a Darling- ton pair and the load is a winding of a cross-bar switch.
GB1712373A 1972-04-11 1973-04-10 Protection circuits for transistor circuits Expired GB1387386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES401654A ES401654A1 (en) 1972-04-11 1972-04-11 Protection circuits for transistor circuits

Publications (1)

Publication Number Publication Date
GB1387386A true GB1387386A (en) 1975-03-19

Family

ID=8460848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1712373A Expired GB1387386A (en) 1972-04-11 1973-04-10 Protection circuits for transistor circuits

Country Status (2)

Country Link
ES (1) ES401654A1 (en)
GB (1) GB1387386A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285737A1 (en) * 1974-09-18 1976-04-16 Ibm ADDITIONAL PROTECTION CIRCUIT FOR COMMON BUS CONTROL
GB2183955A (en) * 1985-12-09 1987-06-10 Hughes Tool Co Overcurrent protection of power transistor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285737A1 (en) * 1974-09-18 1976-04-16 Ibm ADDITIONAL PROTECTION CIRCUIT FOR COMMON BUS CONTROL
GB2183955A (en) * 1985-12-09 1987-06-10 Hughes Tool Co Overcurrent protection of power transistor

Also Published As

Publication number Publication date
ES401654A1 (en) 1975-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees