GB1399636A - Gas detecting apparatus - Google Patents
Gas detecting apparatusInfo
- 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
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).
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2826349A1 (en) * | 1977-06-21 | 1979-01-18 | Efimuschkin | INVERTER |
-
1972
- 1972-08-02 GB GB3615772A patent/GB1399636A/en not_active Expired
Cited By (2)
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 |