GB1137680A - Protective circuit for switching transistors - Google Patents

Protective circuit for switching transistors

Info

Publication number
GB1137680A
GB1137680A GB2787366A GB2787366A GB1137680A GB 1137680 A GB1137680 A GB 1137680A GB 2787366 A GB2787366 A GB 2787366A GB 2787366 A GB2787366 A GB 2787366A GB 1137680 A GB1137680 A GB 1137680A
Authority
GB
United Kingdom
Prior art keywords
transistor
load
circuit
base
supply
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
GB2787366A
Inventor
John Harbour
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB2787366A priority Critical patent/GB1137680A/en
Publication of GB1137680A publication Critical patent/GB1137680A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Protection Of Static Devices (AREA)

Abstract

1,137,680. Protecting transistor circuits. IMPERIAL CHEMICAL INDUSTRIES Ltd. 1 June, 1967 [22 June, 1966], No. 27873/66. Heading H3T. [Also in Division H2] A protective arrangement for a switching transistor 98 feeding a load 100 comprises a further transistor 94 connected across the base emitter circuit and having its base coupled to the collector circuit so that the second transistor shunts the input circuit of the first when the load current is excessive. In addition, means are provided periodically to reduce the voltage supply but to maintain a steady supply to the base of the first transistor so that load current is restored when the fault is cleared. As shown, the periodic reductions are provided by an unsmoothed supply but an interrupter (Fig. 5, not shown) could be used. The switching circuit is controlled through a transistor 82 from a logic current (not shown) and diode 92 blocks bias current flow through the load when transistor 98 is off.
GB2787366A 1966-06-22 1966-06-22 Protective circuit for switching transistors Expired GB1137680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2787366A GB1137680A (en) 1966-06-22 1966-06-22 Protective circuit for switching transistors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2787366A GB1137680A (en) 1966-06-22 1966-06-22 Protective circuit for switching transistors

Publications (1)

Publication Number Publication Date
GB1137680A true GB1137680A (en) 1968-12-27

Family

ID=10266671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2787366A Expired GB1137680A (en) 1966-06-22 1966-06-22 Protective circuit for switching transistors

Country Status (1)

Country Link
GB (1) GB1137680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168884A1 (en) * 1972-01-25 1973-09-07 Cit Alcatel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168884A1 (en) * 1972-01-25 1973-09-07 Cit Alcatel

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