GB2020504A - Transistor protection circuits - Google Patents

Transistor protection circuits

Info

Publication number
GB2020504A
GB2020504A GB7914061A GB7914061A GB2020504A GB 2020504 A GB2020504 A GB 2020504A GB 7914061 A GB7914061 A GB 7914061A GB 7914061 A GB7914061 A GB 7914061A GB 2020504 A GB2020504 A GB 2020504A
Authority
GB
United Kingdom
Prior art keywords
protection circuits
current
voltage drop
transistors
sensing resistor
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.)
Granted
Application number
GB7914061A
Other versions
GB2020504B (en
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.)
ZF International UK Ltd
Original Assignee
Lucas 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB7914061A priority Critical patent/GB2020504B/en
Publication of GB2020504A publication Critical patent/GB2020504A/en
Application granted granted Critical
Publication of GB2020504B publication Critical patent/GB2020504B/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

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

A circuit employing parallel power transistors (10, 11) intended to share the current in a load (12), includes a separate current sensing resistor (13, 14) for each power transistor and independently operating protection circuits including transistors (18, 19) controlled by the voltage drop across the associated sensing resistor (13, 14) to limit the current in each power transistor to a safe level. The protection circuits each include zener diodes (26, 27, 30, 31) and resistors (24, 25, 28, 29) connected to vary the current limit in accordance with the voltage drop across the power transistors. <IMAGE>
GB7914061A 1978-05-05 1979-04-23 Transistor protection circuits Expired GB2020504B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7914061A GB2020504B (en) 1978-05-05 1979-04-23 Transistor protection circuits

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1792378 1978-05-05
GB7914061A GB2020504B (en) 1978-05-05 1979-04-23 Transistor protection circuits

Publications (2)

Publication Number Publication Date
GB2020504A true GB2020504A (en) 1979-11-14
GB2020504B GB2020504B (en) 1982-06-09

Family

ID=26253011

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7914061A Expired GB2020504B (en) 1978-05-05 1979-04-23 Transistor protection circuits

Country Status (1)

Country Link
GB (1) GB2020504B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119159A1 (en) * 1983-03-14 1984-09-19 Siemens Aktiengesellschaft Circuit with a switching transistor
EP0166125A1 (en) * 1984-05-30 1986-01-02 i f m electronic gmbh Electronic switching device, preferably operating without making contact
GB2161337A (en) * 1984-07-05 1986-01-08 Teledyne Ind Protection circuit
EP0263343A2 (en) * 1986-09-30 1988-04-13 STMicroelectronics S.r.l. Power transistor with self-protection against direct secondary breakdown
WO2000013279A1 (en) * 1998-08-31 2000-03-09 Siemens Aktiengesellschaft Circuit configuration and method for an electronic fuse

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119159A1 (en) * 1983-03-14 1984-09-19 Siemens Aktiengesellschaft Circuit with a switching transistor
EP0166125A1 (en) * 1984-05-30 1986-01-02 i f m electronic gmbh Electronic switching device, preferably operating without making contact
GB2161337A (en) * 1984-07-05 1986-01-08 Teledyne Ind Protection circuit
GB2161337B (en) * 1984-07-05 1989-07-12 Teledyne Ind Current overload protected solid state relay
EP0263343A2 (en) * 1986-09-30 1988-04-13 STMicroelectronics S.r.l. Power transistor with self-protection against direct secondary breakdown
EP0263343A3 (en) * 1986-09-30 1989-10-11 Sgs Microelettronica S.P.A. Power transistor with self-protection against direct secondary breakdown
WO2000013279A1 (en) * 1998-08-31 2000-03-09 Siemens Aktiengesellschaft Circuit configuration and method for an electronic fuse

Also Published As

Publication number Publication date
GB2020504B (en) 1982-06-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee