GB1473401A - Fire-responsive control device utilizing thyristors - Google Patents

Fire-responsive control device utilizing thyristors

Info

Publication number
GB1473401A
GB1473401A GB3022174A GB3022174A GB1473401A GB 1473401 A GB1473401 A GB 1473401A GB 3022174 A GB3022174 A GB 3022174A GB 3022174 A GB3022174 A GB 3022174A GB 1473401 A GB1473401 A GB 1473401A
Authority
GB
United Kingdom
Prior art keywords
thyristor
oscillator
load
transistor
relay
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
GB3022174A
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.)
Hochiki Corp
Original Assignee
Hochiki 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 Hochiki Corp filed Critical Hochiki Corp
Publication of GB1473401A publication Critical patent/GB1473401A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H03K3/352—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being thyristors
    • H03K3/3525—Anode gate thyristors or programmable unijunction transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H03K17/24—Storing the actual state when the supply voltage fails
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/73—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for dc voltages or currents

Landscapes

  • Fire Alarms (AREA)
  • Power Conversion In General (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Electronic Switches (AREA)

Abstract

1473401 Thyristor switching circuits HOCHIKICORP 8 July 1974 [26 July 1973] 30221/74 Heading H3T [Also in Division G4] Fire responsive apparatus includes a thyristor controlled by a fire responsive device and controlling emergency apparatus, an oscillator for periodically quenching the thyristor so that it goes off when the fire responsive control signal terminates, and delay means maintaining the emergency apparatus operated during the periodic quenching. In the prior circuit of Fig. 1, a thyristor is connected across a D.C. supply in series with an oscillator P and a load Re, for example a relay. When the thyristor is rendered conducting the oscillator causes a relay F intermittently to short circuit the thyristor and switch it off so that if the control signal at the gate is discontinued the thyristor does not reconduct. Fig. 2 shows a circuit according to the invention in which, while the thyristor has a trigger voltage at its gate, contact I of a relay L energizes the load Re and an oscillator F periodically changes over the contact f1 and f2 to periodically extinguish the thyristor, the capacitor C2 maintaining the load energized. In Fig. 3, while the thyristor has a control signal at its gate a transistor Q4 conducts causing Q2 and Q1 to conduct to energize the load Re. Conduction of Q4 also energizes an oscillator comprising charging resistance R7 capacitor C3 and a unijunction transistor PUT the oscillator serving to periodically render transistor Q3 non- conducting so as to cause periodical extinction of the thyristor. Capacitor C4 prevents intermittent energization of the load. In Fig. 4 detection of flame or smoke fires the thyristor to render transistor Q4 conducting and thus cause transistors Q2, Q1 to actuate a relay Re controlling a fire door or a smoke exhaust. Conduction of Q4 also energizes an oscillator comprising R7, C3 and the unijunction transistor PUT and this causes a transistor Q5 to effect the periodical extinction of the thyristor.
GB3022174A 1973-07-26 1974-07-08 Fire-responsive control device utilizing thyristors Expired GB1473401A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8791373U JPS5254272Y2 (en) 1973-07-26 1973-07-26

Publications (1)

Publication Number Publication Date
GB1473401A true GB1473401A (en) 1977-05-11

Family

ID=13928145

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3022174A Expired GB1473401A (en) 1973-07-26 1974-07-08 Fire-responsive control device utilizing thyristors

Country Status (5)

Country Link
JP (1) JPS5254272Y2 (en)
CH (1) CH595018A5 (en)
DE (1) DE2435086B2 (en)
FR (1) FR2239059B1 (en)
GB (1) GB1473401A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722401A (en) * 1982-05-27 1988-02-02 Spectronix Ltd. Actuation circuitry for emergency energization of vehicle fire and explosion detection and suppression system when vehicle is not in operation
CN113513506A (en) * 2021-05-12 2021-10-19 中国人民解放军海军工程大学 Dynamic smoke exhaust system and method based on spatial extinction coefficient measurement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51150285A (en) * 1975-06-18 1976-12-23 Mitsubishi Electric Corp Transistor switch device
US4206502A (en) * 1976-06-09 1980-06-03 Crompton Electricars Ltd. Semiconductor d.c. chopper controllers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722401A (en) * 1982-05-27 1988-02-02 Spectronix Ltd. Actuation circuitry for emergency energization of vehicle fire and explosion detection and suppression system when vehicle is not in operation
CN113513506A (en) * 2021-05-12 2021-10-19 中国人民解放军海军工程大学 Dynamic smoke exhaust system and method based on spatial extinction coefficient measurement
CN113513506B (en) * 2021-05-12 2022-08-16 中国人民解放军海军工程大学 Dynamic smoke exhaust system and method based on spatial extinction coefficient measurement

Also Published As

Publication number Publication date
FR2239059B1 (en) 1977-06-24
FR2239059A1 (en) 1975-02-21
JPS5035157U (en) 1975-04-14
CH595018A5 (en) 1978-01-31
JPS5254272Y2 (en) 1977-12-08
DE2435086B2 (en) 1980-06-12
DE2435086A1 (en) 1975-02-06

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Legal Events

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