EP0167510B1 - Allumage avec un circuit oscillateur - Google Patents

Allumage avec un circuit oscillateur Download PDF

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Publication number
EP0167510B1
EP0167510B1 EP85850225A EP85850225A EP0167510B1 EP 0167510 B1 EP0167510 B1 EP 0167510B1 EP 85850225 A EP85850225 A EP 85850225A EP 85850225 A EP85850225 A EP 85850225A EP 0167510 B1 EP0167510 B1 EP 0167510B1
Authority
EP
European Patent Office
Prior art keywords
winding
primary
circuit
ignition apparatus
feed
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
EP85850225A
Other languages
German (de)
English (en)
Other versions
EP0167510A2 (fr
EP0167510A3 (en
Inventor
Lars Efraimsson
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.)
Svenska Electromagneter AB
Original Assignee
Svenska Electromagneter AB
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 Svenska Electromagneter AB filed Critical Svenska Electromagneter AB
Priority to AT85850225T priority Critical patent/ATE43433T1/de
Publication of EP0167510A2 publication Critical patent/EP0167510A2/fr
Publication of EP0167510A3 publication Critical patent/EP0167510A3/en
Application granted granted Critical
Publication of EP0167510B1 publication Critical patent/EP0167510B1/fr
Expired 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

Definitions

  • a sparking unit with sparking electrodes located in the flame section of the burner.
  • Such ignition electrodes were earlier connected to a transformer coupled to mains voltage, i.e. ignition sparks were obtained with a frequency synchronous with the mains frequency. It was necessary to dimension such ignition transformers so that they could withstand an open spark circuit as well as one that is shortcircuited, and in practice this resulted in large heavy core dimensions.
  • the function of such apparatus is such that by rectifying, for example, half periods of an alternating current (A.C.) mains these are allowed to control the spark interval, during each spark interval, the sparks obtaining a frequency equal to the oscillation frequency of an oscillator included in the circuit.
  • A.C. alternating current
  • Other systems with transistor-controlled oscillation circuits in ignition apparatuses are known from DE-A-2 659 761, US-A-4 358 813 and FR-A-1 392 983 containing a control winding on the primary side of the transformer.
  • the present invention relates to an improvement of the types of apparatus mentioned above, and as will be understood, voltages for the open, i.e. broken, circuit can be kept within values, i.e. substantially constant, which allow considerably simpler insulation of the high-tension section than previously, due to a special implementation of the transformer section itself. Furthermore, the circuit is such that short-circuiting of the sparking side does not result in injurious action on the participating circuit components. There is furthermore achieved that the feed-back winding will be independent of load to a substantial extent.
  • DE-A-2659 761 describes an ignition apparatus comprising an oscillator circuit including a transformer with a primary and a secondary winding, the latter being in communication with electrodes forming a spark gap and comprising an energy generating circuit.
  • US-A-4358 813 refers to a similar ignition apparatus and shows that a feed-back coil for controlling the energy generating circuit is known per se.
  • the ignition apparatus known by US-A-4358 813 is characterized in that the energy generating circuit is connected with a feed-back winding and the primary winding is divided into two part windings coupled in series, the first part winding being inductively coupled with the secondary winding and the second part winding being inductively coupled with the feed-back winding.
  • Two interference-suppressing choke coils or chokes 3,4 are connected to the terminals 1, in an A.C. mains.
  • a rectifier 5 in communication with an interference-suppressing capacitor 6, the other end of which is connected to the free end of the choke 4.
  • the rectifier 5 is in series with a primary winding comprising two parts 7, 8 of an ignition transformer 9, an oscillating circuit capacitor 10 being connected right across both primary windings, the free end of the winding part 8 also being connected to an oscillation energy generating circuit 11 forming part of an oscillator, as will be made clear later.
  • the circuit 11 is in communication with the choke 4 and the capacitor 6, thus forming one path in the circuit of the apparatus.
  • the ignition transformer 9 is provided with a secondary winding 12 which is in communication with electrodes 13, 14 forming a spark gap 15.
  • a feed-back coil 16 for controlling the circuit 11 is also associated with the ignition transformer core, the coil 16 being in current supplying connection with the rectifier 5 via a resistor 17 and a further resistor 18, at the connection point between the resistors 17 and 18 there being connected a capacitor 19 which is in communication with the choke 4.
  • the elements 19 -16 within the dashed line 20 form the oscillator of the circuit.
  • the device operates in the following way.
  • the primary winding is divided into two part windings 7, 8 which are geometrically separated and coupled in series.
  • the primary winding part 7 is magnetically coupled to the secondary winding 12 while the primary winding part 8 is strongly magnetically coupled to the feed-back winding 16.
  • a less strong coupling consequently exists between the winding part 8 and the primary winding 12.
  • the coupling condition described constitutes an oscillation circuit including the primary winding parts 7, 8 together with the load on the secondary winding 12 and the capacitor 10. This oscillation circuit, by geometrical conditions, is such that the reverse voltage towards e.g.
  • transistors in the circuit 11 is kept at a suitable level for all loadings in question, i.e. substantially constant, and there is further achieved that the output voltage is given a suitable load dependence, i.e. it can be kept under control for an open circuit. There is furthermore achieved that the feed-back winding will be independent of load to a substantial extent.
  • the divided primary winding also results in that the output voltage from the secondary side is kept at a uniform level during the half period of the mains frequency, which means that maximum secondary voltage is already obtained at a very early stage of the voltage half period and is thereafter kept at a substantially constant level.
  • a series of spark voltages occur which are so close to each other in time that spark gap ionisation does not normally have time to cease, resulting in the occurrence of an essentially homogenous discharge for each half period the oscillator is in operation.
  • the ignition transformer in one embodiment is built as is apparent from Figure 2.
  • a core 9 of a magnetically conductive material e.g. ferrite or the like
  • a long winding closely coupled to the core and extending substantially along the entire length of the core, this winding being the winding 7 in the diagram according to Figure 1.
  • a winding bobbin carrying the secondary winding 12, which lengthwise in relation to the core only takes up about two-thirds of the core length.
  • the part winding 8 On the remaining third and laterally in relation to the secondary winding 12 there is arranged the part winding 8, which is thus situated outside the winding 7.
  • the feed-back winding 16 is arranged to one side of the part winding 8.
  • the relationship between the windings 7 and 8 is such that the windings 8 has about half the turns of the winding 7.
  • the windings 8 and 16 are to be closely intimate with each other while the winding 8 is less closely intimate with the secondary winding 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Control Of Eletrric Generators (AREA)
  • Plasma Technology (AREA)
  • Ac-Ac Conversion (AREA)

Claims (7)

1. Dispositif d'allumage, comprenant un circuit oscillateur (20) comportant un transformateur (9) qui présente un enroulement primaire (7, 8) et un enroulement secondaire (12), ce dernier communiquant avec des électrodes (13, 14) qui constituent un éclateur (15), ce dispositif d'allumage comprenant un circuit (11) générant de l'énergie, caractérisé en ce que le circuit (11) générant de l'énergie est relié à un enroulement de rétroaction (16) et en ce que l'enroulement primaire est divisé en deux enroulements partiels (7, 8) couplés en série, le premier enroulement partiel (7) étant couplé inductivement avec l'enroulement secondaire (12) et le second enroulement partiel (8) étant couplé inductivement avec l'enroulement de rétroaction (16), de façon que les tensions de fonctionnement du dispositif puissent être maintenues indépendantes des conditions de charge qui varient substantiellement.
2. Dispositif d'allumage conforme à la revendication 1, caractérisé en ce que le premier enroulement primaire partiel (7) s'étend le long du noyau (9) et le long de l'enroulement secondaire (12) comme du second enroulement primaire partiel (8) et de l'enroulement de rétroaction (16), l'enroulement secondaire (12) et le second enroulement primaire partiel (8) étant disposés latéralement l'un par rapport à l'autre (voir figure 2).
3. Dispositif d'allumage conforme à la revendication 2, caractérisé en ce que l'enroulement de rétroaction (16) est disposé latéralement par rapport au second enroulement primaire partiel (8) en étant éloigné de l'enroulement secondaire (12).
4. Dispositif d'allumage conforme à l'une quelconque des revendications précédentes, caractérisé en ce que le noyau (9) est allongé (figure 2), en ce que le premier enroulement primaire partiel (7) est placé en étroite association avec le noyau (9) et s'étend le long d'une partie substantielle de la longueur de celui-ci, en ce que l'enroulement secondaire (12) est placé à l'extérieur du premier enroulement partiel (7) et s'étend le long d'une partie de celui-ci, et en ce que sont placés sur la partie restante du premier enroulement partiel (7) le second enroulement primaire partiel (8) ainsi que l'enroulement de rétroaction (16).
5. Dispositif d'allumage conforme à l'une quelconque des revendications précédentes, caractérisé en ce que le premier enroulement primaire partiel (7) comporte un nombre de tours qui est sensiblement le double de celui du second enroulement primaire partiel (8).
6. Dispositif d'allumage conforme à l'une quelconque des revendications précédentes, caractérisé en ce que les enroulements primaires (7, 8) font partie du trajet d'alimentation en courant (figure 1) du circuit oscillateur (20).
7. Dispositif d'allumage conforme à l'une quelconque des revendications précédentes, caractérisé en ce que les côtés primaires et secondaires constituent un circuit oscillant limiteur de tension (7, 8, 12) d'un circuit d'étincellement ouvert.
EP85850225A 1984-07-05 1985-07-01 Allumage avec un circuit oscillateur Expired EP0167510B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85850225T ATE43433T1 (de) 1984-07-05 1985-07-01 Zuendvorrichtung mit oscillatorkreis.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403584A SE443220B (sv) 1984-07-05 1984-07-05 Anordning vid gnistgeneratorer
SE8403584 1984-07-05

Publications (3)

Publication Number Publication Date
EP0167510A2 EP0167510A2 (fr) 1986-01-08
EP0167510A3 EP0167510A3 (en) 1987-05-27
EP0167510B1 true EP0167510B1 (fr) 1989-05-24

Family

ID=20356460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85850225A Expired EP0167510B1 (fr) 1984-07-05 1985-07-01 Allumage avec un circuit oscillateur

Country Status (4)

Country Link
EP (1) EP0167510B1 (fr)
AT (1) ATE43433T1 (fr)
DE (2) DE167510T1 (fr)
SE (1) SE443220B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1289096B1 (it) * 1996-04-10 1998-09-25 Brahma S P A Dispositivo per l'accensione di bruciatori a fiamma o similari atto a consentire la limitazione dei radiodisturbi.
ITTO980397A1 (it) * 1998-05-12 1999-11-12 Miller Europe Spa Accendigas elettrico.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1392983A (fr) * 1964-04-29 1965-03-19 Rowenta Metallwarenfab Gmbh Briquet à gaz à allumage par étincelles
IT1060399B (it) * 1975-12-31 1982-07-10 O F R Officine Fratelli Riello Apparecchiatura di comando per bruciatore a combustibile liquido
US4358813A (en) * 1980-11-20 1982-11-09 Matsushita Electric Industrial Co., Ltd. Ignition apparatus for a burner

Also Published As

Publication number Publication date
DE167510T1 (de) 1986-04-10
SE8403584L (sv) 1986-01-06
DE3570512D1 (en) 1989-06-29
EP0167510A2 (fr) 1986-01-08
SE443220B (sv) 1986-02-17
EP0167510A3 (en) 1987-05-27
ATE43433T1 (de) 1989-06-15
SE8403584D0 (sv) 1984-07-05

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