GB957015A - Electromagnetic time delay apparatus - Google Patents

Electromagnetic time delay apparatus

Info

Publication number
GB957015A
GB957015A GB70960A GB70960A GB957015A GB 957015 A GB957015 A GB 957015A GB 70960 A GB70960 A GB 70960A GB 70960 A GB70960 A GB 70960A GB 957015 A GB957015 A GB 957015A
Authority
GB
United Kingdom
Prior art keywords
circuit
relay
transistor
capacitor
contact
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
GB70960A
Inventor
Gordon Brooks
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.)
Lucas Support Services Ltd
Original Assignee
Rotax 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 Rotax Ltd filed Critical Rotax Ltd
Priority to GB70960A priority Critical patent/GB957015A/en
Publication of GB957015A publication Critical patent/GB957015A/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
    • 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
    • H03K17/292—Modifications for introducing a time delay before switching in thyristor, unijunction transistor or programmable unijunction transistor switches

Landscapes

  • Electronic Switches (AREA)
  • Relay Circuits (AREA)

Abstract

957,015. Transistor switching circuits. ROTAX Ltd. Jan. 5, 1961 [Jan. 8, 1960], No. 709/60. Heading H3T. [Also in Division G3] In an electrical timing device, a transistor is cut-off until a capacitor mounted across the input terminals of the device receives sufficient charge and when the latter condition is reached, the transistor conducts to operate a self-holding relay. The invention may be used in a D.C. circuit but as described the circuit to be controlled uses an A.C. supply fed from terminal 1 via relay contact 16 to the output terminal so that a full-wave rectifier 4 is included in order to power the device. When switch 3 is operated, capacitor 9 receives a charging current from rectifier 4, the rate of charge being determined by resistor 10. A four-layer diode 13 breaks down when the potential across capacitor 9 is sufficient and in so doing, allows transistor 11 to conduct. Consequently relay 14 operates and completes at contact 16 the power lead to the controlled circuit and at contact 17 closes a self-holding circuit. Rectifier 15 is used to ensure that leakage current from the ballast network 7, 8 does not operate the relay prematurely.
GB70960A 1960-01-08 1960-01-08 Electromagnetic time delay apparatus Expired GB957015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB70960A GB957015A (en) 1960-01-08 1960-01-08 Electromagnetic time delay apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB70960A GB957015A (en) 1960-01-08 1960-01-08 Electromagnetic time delay apparatus

Publications (1)

Publication Number Publication Date
GB957015A true GB957015A (en) 1964-05-06

Family

ID=9709166

Family Applications (1)

Application Number Title Priority Date Filing Date
GB70960A Expired GB957015A (en) 1960-01-08 1960-01-08 Electromagnetic time delay apparatus

Country Status (1)

Country Link
GB (1) GB957015A (en)

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