GB1399636A - Gas detecting apparatus - Google Patents

Gas detecting apparatus

Info

Publication number
GB1399636A
GB1399636A GB3615772A GB3615772A GB1399636A GB 1399636 A GB1399636 A GB 1399636A GB 3615772 A GB3615772 A GB 3615772A GB 3615772 A GB3615772 A GB 3615772A GB 1399636 A GB1399636 A GB 1399636A
Authority
GB
United Kingdom
Prior art keywords
voltage
gas
gas detecting
energized
transformer
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
GB3615772A
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.)
Yazaki Corp
Original Assignee
Yazaki Sogyo KK
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 Yazaki Sogyo KK filed Critical Yazaki Sogyo KK
Priority to GB3615772A priority Critical patent/GB1399636A/en
Publication of GB1399636A publication Critical patent/GB1399636A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53846—Control circuits
    • H02M7/53862—Control circuits using transistor type converters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
    • H02M7/53846—Control circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Emergency Alarm Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

1399636 Gas detecting apparatus YAZAKI SOGYO KK 2 Aug 1972 36157/72 Heading G1N [Also in Division G3] In a gas detecting device having at least one semi-conductor gas detecting element ELEM, an A.C. voltage, sufficiently low so as not to produce self-heating of the element, is applied to electrodes of the element, the change in resistance of the element due to the gas being converted into a voltage which is applied to a differential amplifier. As shown, the element is arranged in a bridge with resistances R 1 , R 2 and R 3 , the heater of the element, which also forms one electrode being applied with a voltage tapped from a transformer T, and the A.C. voltage applied to the electrodes also being tapped from the transformer. The bridge output is connected to a differential amplifier having a pair of transistors Tr 1 , Tr 2 . Upon detection of gas, a relay is energized to operate a switch which causes an alarm to be energized, and a gas supply to be switched off. As shown in Fig.4, a number of elements may be connected in parallel. When the device is to be used at a location where an A.C. supply is not available, means may be provided to convert a D.C. voltage into an A.C. voltage, Fig.6 (not shown).
GB3615772A 1972-08-02 1972-08-02 Gas detecting apparatus Expired GB1399636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3615772A GB1399636A (en) 1972-08-02 1972-08-02 Gas detecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3615772A GB1399636A (en) 1972-08-02 1972-08-02 Gas detecting apparatus

Publications (1)

Publication Number Publication Date
GB1399636A true GB1399636A (en) 1975-07-02

Family

ID=10385504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3615772A Expired GB1399636A (en) 1972-08-02 1972-08-02 Gas detecting apparatus

Country Status (1)

Country Link
GB (1) GB1399636A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2826349A1 (en) * 1977-06-21 1979-01-18 Efimuschkin INVERTER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2826349A1 (en) * 1977-06-21 1979-01-18 Efimuschkin INVERTER
FR2395635A1 (en) * 1977-06-21 1979-01-19 Efimushkin Jury CONTINUOUS VOLTAGE CONVERTER TO ALTERNATIVE VOLTAGE

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Legal Events

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