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GB1141640A - Improvements relating to electric timing circuits - Google Patents

Improvements relating to electric timing circuits

Info

Publication number
GB1141640A
GB1141640A GB5316067A GB5316067A GB1141640A GB 1141640 A GB1141640 A GB 1141640A GB 5316067 A GB5316067 A GB 5316067A GB 5316067 A GB5316067 A GB 5316067A GB 1141640 A GB1141640 A GB 1141640A
Authority
GB
United Kingdom
Prior art keywords
diode
relay
initial charge
capacitor
circuit
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
GB5316067A
Inventor
Malcolm Legg
John Brian Patrickson
Leonard Martin Wedepohl
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and Co 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB5316067A priority Critical patent/GB1141640A/en
Publication of GB1141640A publication Critical patent/GB1141640A/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
    • H03K17/28—Modifications for introducing a time delay before switching
    • 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
    • H02H3/093—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 with timing means

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

1,141,640. Time delay switching circuits. A. REYROLLE & CO. Ltd. 22 April, 1966 [23 April, 1965], No. 53160/67. Divided out of 1,124,492. Heading H3T. [Also in Division H2] The integrating capacitor 20 of a timing circuit is given a small initial charge by connecting the charging terminal of the capacitor through a diode 41 to the junction of a potentiometer 42, 43 and a further diode 44 is connected in series with resistor 43 to compensate for changes in voltage across diode 41 with temperature. The initial charge removes variations in the timing period due to the difficulties of completely discharging the capacitor caused by dielectric absorption and other reasons. In the protective system shown, the operation of reed relay 10 due to overload causes a contact 11 to be made so that the initial charge is applied and progressive charging commences. Charging continues until a complementary type crosscoupled circuit 23 is thereby changed to the conducting state to render transistor 27 conducting and operate relay 30. Contact 32 of this relay operates a relay 34 provided with a holding circuit 37 and also operates the tripping coil 36. A third diode 45 compensates for the voltage drop across the emitter-base diode of transistor 22.
GB5316067A 1965-04-23 1965-04-23 Improvements relating to electric timing circuits Expired GB1141640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5316067A GB1141640A (en) 1965-04-23 1965-04-23 Improvements relating to electric timing circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5316067A GB1141640A (en) 1965-04-23 1965-04-23 Improvements relating to electric timing circuits

Publications (1)

Publication Number Publication Date
GB1141640A true GB1141640A (en) 1969-01-29

Family

ID=10466837

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5316067A Expired GB1141640A (en) 1965-04-23 1965-04-23 Improvements relating to electric timing circuits

Country Status (1)

Country Link
GB (1) GB1141640A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495347U (en) * 1972-04-18 1974-01-17

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495347U (en) * 1972-04-18 1974-01-17

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