BE901613A - Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs - Google Patents

Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs Download PDF

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Publication number
BE901613A
BE901613A BE0/214421A BE214421A BE901613A BE 901613 A BE901613 A BE 901613A BE 0/214421 A BE0/214421 A BE 0/214421A BE 214421 A BE214421 A BE 214421A BE 901613 A BE901613 A BE 901613A
Authority
BE
Belgium
Prior art keywords
emi
circuit
humidity
triacs
synchronisation
Prior art date
Application number
BE0/214421A
Other languages
French (fr)
Original Assignee
Erumba Gotaha Henri
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 Erumba Gotaha Henri filed Critical Erumba Gotaha Henri
Priority to BE0/214421A priority Critical patent/BE901613A/en
Publication of BE901613A publication Critical patent/BE901613A/en

Links

Classifications

    • 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
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G01N27/225—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D22/00—Control of humidity
    • G05D22/02—Control of humidity characterised by the use of electric means

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electrochemistry (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electronic Switches (AREA)

Abstract

A 10 kHz multivibrator comprising two NOR gates , sets a monostable circuit whose capacitive element is the humidity sensor. The output pulse width is a function of the humidity. A linearisation circuit is coupled by a three-wire cable to an analyser with an A/D convertor driving a seven-segment display. - Above 50% humidity the signal is amplified by a differential amplifier, with comparators operating an LED when it is outside the 60-90% range. A one-minute delay circuit with two differentiating stages drives a Schmitt trigger . Another comparator supplies a synchronising circuit contg. two bistables , the latter acting as a memory for its output.

Description

       

   <EMI ID=1.1> 

  
 <EMI ID=2.1> 

  
1. partie contenant le capteur, fournissant une tension de

  
sortie proportionnelle à la valeur d'humidité dans l'environnement du capteur. (D)

  
 <EMI ID=3.1> 

  
cation chiffrée de 1'humidité
-enclencher ou débrancher en synchronisation avec le cycle de l'alimenta- <EMI ID=4.1> 

  
3. l'humidificateur, laissé au choix de l'utilisateur. Notons  <EMI ID=5.1> 

  
rorisateur à électrodes sans que des phénomènes d'électro-
-lyse apparaissent (rouille d'un ou des deux électrodes).

  
En effet,la moyenne algébrique de la tension d'alimentation est de zéro.

  
 <EMI ID=6.1> 

  
pulsion de sortie dépend donc de la valeur d'humidité détectée. La fonction de transfert du senseur n'étant pas linéaire,un circuit de linéarisation doit être conçu et est formé par D1,
(pour un complément d'information,voir le document PHILIPS).

  
 <EMI ID=7.1> 

  
trois conducteurs, transférant la tension d'alimentation du cir-

  
 <EMI ID=8.1> 

  
 <EMI ID=9.1> 

  
relativement éloigné du circuit d'analyse.

  
Le signal provenant du détecteur est amplifié et envoyé vers <EMI ID=10.1> 

  
 <EMI ID=11.1> 

  
comptée).Ce convertisseur est également puisé dans le document technique précité. 

  
 <EMI ID=12.1> 

  
Un ampli de différence,permettant d'améliorer la sensibilité des comparaisons, amplifie le signal d'entrée de 6,66

  
 <EMI ID=13.1> 

  
 <EMI ID=14.1> 

  
dépasse 901, situation anormale, tandis que le A7 le fait lors-

  
 <EMI ID=15.1> 

  
 <EMI ID=16.1> 

  
ne se modifiera pas pendant une minute.

  
Chacune des sorties de ce circuit de retard alimente une des entrées du comparateur A8 qui lui alimente le-cir-

  
 <EMI ID=17.1> 

  
Ce circuit se compose de deux parties, chacune pour une alternance du courant alternatif du secteur. Ce circuit est

  
 <EMI ID=18.1> 

  
triacs servent d'interrupteur électronique. Chacune des cachettes est branchée sur la sortie phototransistor du coupleur^ optique lui étant associé.

  
 <EMI ID=19.1> 



   <EMI ID = 1.1>

  
 <EMI ID = 2.1>

  
1. part containing the sensor, providing a voltage of

  
output proportional to the humidity value in the environment of the sensor. (D)

  
 <EMI ID = 3.1>

  
quantified humidity cation
- switch on or off in synchronization with the power cycle - <EMI ID = 4.1>

  
3. the humidifier, left to the user's choice. Denote <EMI ID = 5.1>

  
electrode wiper without electro-
-lyse appear (rust of one or both electrodes).

  
Indeed, the algebraic mean of the supply voltage is zero.

  
 <EMI ID = 6.1>

  
output pulse therefore depends on the humidity value detected. As the transfer function of the sensor is not linear, a linearization circuit must be designed and is formed by D1,
(for more information, see the PHILIPS document).

  
 <EMI ID = 7.1>

  
three conductors, transferring the circuit supply voltage

  
 <EMI ID = 8.1>

  
 <EMI ID = 9.1>

  
relatively far from the analysis circuit.

  
The signal from the detector is amplified and sent to <EMI ID = 10.1>

  
 <EMI ID = 11.1>

  
This converter is also taken from the aforementioned technical document.

  
 <EMI ID = 12.1>

  
A difference amplifier, which improves the sensitivity of comparisons, amplifies the input signal by 6.66

  
 <EMI ID = 13.1>

  
 <EMI ID = 14.1>

  
exceeds 901, abnormal situation, while the A7 does so

  
 <EMI ID = 15.1>

  
 <EMI ID = 16.1>

  
will not change for a minute.

  
Each of the outputs of this delay circuit supplies one of the inputs of comparator A8 which supplies it with the circuit

  
 <EMI ID = 17.1>

  
This circuit consists of two parts, each for alternating the alternating current of the sector. This circuit is

  
 <EMI ID = 18.1>

  
triacs serve as electronic switch. Each of the hiding places is connected to the phototransistor output of the optical coupler associated therewith.

  
 <EMI ID = 19.1>

Claims (1)

<EMI ID=20.1>  <EMI ID = 20.1> <EMI ID=21.1>  <EMI ID = 21.1> <EMI ID=22.1>  <EMI ID = 22.1> comparateur AS.Mnsi cette mémoire enregistrera une donnée que toutes'les périodes du signal secteur et au passage par'zéro de comparator AS.Mnsi this memory will record a data that all the periods of the sector signal and the passage by zero of <EMI ID=23.1>  <EMI ID = 23.1> Les deux triacs re se fermeront uniquement qu'au début d'une période du signal secteur.Ce la remet d'alimenter un vaporisateur à électrodes sans risque de voir ceux-ci rouiller par effet d'électrolyse,comme cela se passerait avec des contac- The two triacs re will only close at the start of a period of the mains signal. This puts it back to supply a vaporizer with electrodes without risk of seeing them rust by electrolysis effect, as would happen with contac - <EMI ID=24.1>  <EMI ID = 24.1> <EMI ID=25.1>  <EMI ID = 25.1>
BE0/214421A 1985-01-31 1985-01-31 Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs BE901613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE0/214421A BE901613A (en) 1985-01-31 1985-01-31 Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/214421A BE901613A (en) 1985-01-31 1985-01-31 Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs
BE901613 1985-01-31

Publications (1)

Publication Number Publication Date
BE901613A true BE901613A (en) 1985-05-17

Family

ID=25654446

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/214421A BE901613A (en) 1985-01-31 1985-01-31 Humidity detector and controller - performs comparison and synchronisation by circuit driving two separate triacs

Country Status (1)

Country Link
BE (1) BE901613A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590354A1 (en) * 1985-11-19 1987-05-22 Aero Plast Improved ventilation installation
EP0582279A1 (en) * 1992-08-07 1994-02-09 Honeywell Ag Circuit for exploitating the signal of a capacitive sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590354A1 (en) * 1985-11-19 1987-05-22 Aero Plast Improved ventilation installation
EP0582279A1 (en) * 1992-08-07 1994-02-09 Honeywell Ag Circuit for exploitating the signal of a capacitive sensor

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: ERUMBA GOTAHA HENRI

Effective date: 19860131