EP0801267A2 - Zündvorrichtung für Brenner mit Unterdrückung von Hochfrequenzstörungen - Google Patents

Zündvorrichtung für Brenner mit Unterdrückung von Hochfrequenzstörungen Download PDF

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Publication number
EP0801267A2
EP0801267A2 EP97830096A EP97830096A EP0801267A2 EP 0801267 A2 EP0801267 A2 EP 0801267A2 EP 97830096 A EP97830096 A EP 97830096A EP 97830096 A EP97830096 A EP 97830096A EP 0801267 A2 EP0801267 A2 EP 0801267A2
Authority
EP
European Patent Office
Prior art keywords
ignition device
circuit
ignition
condenser
flame burner
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.)
Ceased
Application number
EP97830096A
Other languages
English (en)
French (fr)
Other versions
EP0801267A3 (de
Inventor
Bruno Giordano
Nicola Renoffio
Daniele Zaupa
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.)
Brahma SpA
Original Assignee
Brahma SpA
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 Brahma SpA filed Critical Brahma SpA
Publication of EP0801267A2 publication Critical patent/EP0801267A2/de
Publication of EP0801267A3 publication Critical patent/EP0801267A3/de
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/004—Using semiconductor elements

Definitions

  • the present invention refers to an ignition device for a flame burner or the like. This device is realized in such a way to permit a limitation of radio interference.
  • the present art includes appliances in which it is necessary to light the fire for instance in a flame burner or the like.
  • particular electron devices may be used and may be equipped with capacitive discharge transformers.
  • Such transformers generate an electric discharge by using the energy accumulated by a condenser.
  • such devices may be provided with transformers which use oscillatory circuits in order to generate high-frequency electric discharges,for instance in the range of a few kHz.
  • a diode D2 is therefore a diode "flywheel".
  • the repetition frequency of the spark, the tension in the secondary of the transformer T and the generated energy depend on the frequency of the input tension and on the dimensions of the used components.
  • the present invention proposes a solution alternative to the use of the conventional anti-interference filters in order to make the working of the ignition device acceptable as concerns the electromagnetic compatibility in relation to the radio interference.
  • the present invention permits to reach some practical advantages relative to the fact that first of all the adopted measures are more economic than the knwon filters and solutions and above all these measures permit to reduce the dimensions of encumbrance to a minimum so that the same solution may be adopted also in those appliances in which the available spaces are reduced to the simplest terms.
  • an ignition device for a flame burner or the like permitting a limitation or radio interference characterized by the fact of consisting of a circuit in which all or some of the following measures are provided: a SCR connection forms a current ring between the SCR and the transformer; a resistance controlling the charge of a condenser is divided in two parts, a resistance part being connected with a phase and the other part being connected with a neutral; a control synchronizer is used to prevent the formation of an electric discharge during the charge phase of the condenser; a comb is grounded and is placed under an ignition transformer; the transformer is realized by winding a primary on a secondary and in the inner part of both windings there is a ferrite or the like for optimizing the energy transfer; utilization of two condensers which discharge the generated radio disturbances to the ground and above all, such condensers filter all the radio disturbances which are catched by the primary winding; a direct connection of the ignition device or a
  • the first measure refers to the connection for the SCR which is arranged in such a way to form a current ring between the SCR itself and the transformer when there is the discharge. This permits to obtain a good reduction in the generated radio interference, especially as regards the low- frequencies (lower than 1 MHz).
  • the second measure as it appears from Fig. 3 refers to the resistance regulating the charge of the condenser, which resistance is divided in two resistances, the former being connected to the phase (R1) and the latter being connected to the neutral (R2).
  • This solution permits a better balance of the radio interference which occurs in the phase and neutral.
  • the radio interference coupled with the neutral is very higher than the radio interference coupled with the phase.
  • a third measure refers to the use of a synchronizer as it appears from Fig. 4.
  • This synchronizer prevents the formation of an electric discharge during the charging phase of the condenser C1 and during the whole period in which the diode D1 is directly polarized.
  • This measure prevents that a current source be generated when the device is connected to the input voltage through the conduction of the diode D1.
  • this measure permits that the radio interferences be generated only when the device is decoupled from the supply mains through the diode D1 which is denied in this phase.
  • This measure is a further improvement as concerns the radio interferences, especially in case of low-frequencies (lower than 1 MHz).
  • the fourth measure resulting from Fig. 5 concerns the use of a grounded comb A placed under the ignition transformer B in order to absorb the generated radio interference as much as possible.
  • Fig. 6 shows a fifth measure according to which the transformer T is realized by winding the primary 1 on the secondary 2 so that the transformer T acts also as a screening element. In this way, it is not necessary to insert screens realized in conductive materials for screening the transformer according to the known art.
  • a sixth measure refers to the utilization of two condensers (C2 and C3) connected as it results from Figg. 9-12 and used to discharge the generated radio interferences to the ground.
  • these condensers (C2 and C3) filter all the radio interferences which are catched by by the winding of the primary, this winding having also a screening function.
  • These condensers may be connected both upstream and downstream in respect to the resistors R1 and R2, as it is represented in Figg. 9-12. The connection assuring the highest effectiveness is to be determined each time depend ing above all on the arrangement of the components of the printed circuit or in the inside of the ignition device.
  • a further effective measure for reducing the radio interferences consists in directly connecting the ignition device 4 or only a part thereof to the ignition electrode 5, as it is schematically represented in Fig. 19.
  • This measure eliminates the presence of a high-tension cable. This is advantageous since high - tension cables as aerials irradiate electromagnetic waves in the atmosphere. Accordingly, this measure cancels a part of the other measures.
  • Fig. 16 it results in detail the whole circuitry concerning the solution of the problem of radio interference.
  • the command pulse or signal shown in Fig. 4 may be generated by using for instance a diac (Fig. 13), a zener (Fig. 14) or whatever electric component or circuit which may control the conduction of the SCR whenever the voltage across the condenser C1 reaches the wished value (Fig. 15).
  • the SCR discharges the energy which had been previously stored in the condenser C1 on the primary of the transformer T.
  • the diode D2 is thus a "flywheel" diode.
  • the spark is generated during the half wave opposite to the charge half wave. In this way the remaining radio interferences are eliminated, especially in case of frequencies lower than about 1 MHz.
  • the so-obtained solution permits to amply maintain the radio interferences generated by this kind of ignition device within the limits provided for by the relevant provisions.
  • the radio interferences issued by the currently used ignition devices always exceed the upper limit permitted by the provisions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Filtering Materials (AREA)
EP97830096A 1996-04-10 1997-03-04 Zündvorrichtung für Brenner mit Unterdrückung von Hochfrequenzstörungen Ceased EP0801267A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR960037 1996-04-10
IT96VR000037A IT1289096B1 (it) 1996-04-10 1996-04-10 Dispositivo per l'accensione di bruciatori a fiamma o similari atto a consentire la limitazione dei radiodisturbi.

Publications (2)

Publication Number Publication Date
EP0801267A2 true EP0801267A2 (de) 1997-10-15
EP0801267A3 EP0801267A3 (de) 1999-09-01

Family

ID=11428177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830096A Ceased EP0801267A3 (de) 1996-04-10 1997-03-04 Zündvorrichtung für Brenner mit Unterdrückung von Hochfrequenzstörungen

Country Status (2)

Country Link
EP (1) EP0801267A3 (de)
IT (1) IT1289096B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957315A3 (de) * 1998-05-12 2000-05-31 Miller Europe S.p.A. Elektrischer Gasanzünder
EP0957316A3 (de) * 1998-05-12 2000-05-31 Miller Europe S.p.A. Elektrischer Gasanzünder
EP0969251A3 (de) * 1998-06-30 2001-09-26 Daewoo Electronics Co., Ltd Zündvorrichtung für Heizkessel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723723A (en) * 1980-07-18 1982-02-08 Yamatake Honeywell Co Ltd Transistor ignition device
AU2020783A (en) * 1982-10-20 1984-05-03 Technical Components Pty. Ltd. Gas ignition circuits
SE443220B (sv) * 1984-07-05 1986-02-17 Svenska Electromagneter Anordning vid gnistgeneratorer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957315A3 (de) * 1998-05-12 2000-05-31 Miller Europe S.p.A. Elektrischer Gasanzünder
EP0957316A3 (de) * 1998-05-12 2000-05-31 Miller Europe S.p.A. Elektrischer Gasanzünder
US6242866B1 (en) 1998-05-12 2001-06-05 Miller Europe S.P.A. Electric gas-lighter
US6449138B2 (en) 1998-05-12 2002-09-10 Miller Europe S.P.A. Electric gas-lighter
EP0969251A3 (de) * 1998-06-30 2001-09-26 Daewoo Electronics Co., Ltd Zündvorrichtung für Heizkessel

Also Published As

Publication number Publication date
ITVR960037A1 (it) 1997-10-10
ITVR960037A0 (it) 1996-04-10
EP0801267A3 (de) 1999-09-01
IT1289096B1 (it) 1998-09-25

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