EP0705528B1 - Generateur de haute tension - Google Patents
Generateur de haute tension Download PDFInfo
- Publication number
- EP0705528B1 EP0705528B1 EP94920496A EP94920496A EP0705528B1 EP 0705528 B1 EP0705528 B1 EP 0705528B1 EP 94920496 A EP94920496 A EP 94920496A EP 94920496 A EP94920496 A EP 94920496A EP 0705528 B1 EP0705528 B1 EP 0705528B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- primary
- transformer
- voltage generator
- windings
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/666—Safety circuits
Definitions
- the present invention relates to a generator high voltage intended to supply at least a payload of the unidirectional type such that, for example, a magnetron or an electron tube and comprising a step-up transformer comprising a primary stage connected to a primary circuit, and a secondary stage having a winding connected to a secondary circuit comprising the load of use, said primary circuit being connected to an energy source electric and comprising electronic switching means so as to supply said transformer with high frequency current.
- the primary stage of the transformer comprises first and second windings, mounted in a serial link having an intermediate socket and two end sockets, the primary circuit being connected directly to the intermediate socket.
- the object of the present invention is the realization of a transformer of a reduced price, which is perfectly suited for use in a generator high voltage for microwave oven and susceptible mass production.
- the primary circuit is connected to one of the two end taps via said switching means, a capacity connecting the two end sockets so as to produce, with the first and second windings, an oscillating circuit.
- the generator uses a transformer series resonance whose operation is particularly suitable for a primary circuit comprising means switches consisting of IGBT type switches (Anglo-Saxon initials set for "Insulated Gate Bipolar Transistor ”) or MCT (Anglo-Saxon initials set for "Multiple Collector Transistor).
- IGBT type switches Anglo-Saxon initials set for "Insulated Gate Bipolar Transistor ”
- MCT Anglo-Saxon initials set for "Multiple Collector Transistor
- the high-voltage generator is intended for supplying one or possibly several loads of the unidirectional type such as, for example, a microwave oven magnetron or an electronic tube, and comprises a step-up transformer comprising, as we can see in Figure 1, a primary stage E 1 connected to a primary circuit CP and a secondary stage E 2 having a winding L 3 connected to a secondary circuit S 0 , S 1 comprising the load of use, said circuit primary CP connecting the primary stage E 1 of the transformer T to a source of electrical energy B 0 , B i and comprising switching means K so as to supply the transformer T with high frequency current.
- a step-up transformer comprising, as we can see in Figure 1, a primary stage E 1 connected to a primary circuit CP and a secondary stage E 2 having a winding L 3 connected to a secondary circuit S 0 , S 1 comprising the load of use, said circuit primary CP connecting the primary stage E 1 of the transformer T to a source of electrical energy B 0 , B i and comprising switching
- a series resonance transformer i.e. a transformer with self leakage inductance on a capacity, generally presents itself as an element of type inductive for low frequencies and resonant type when the frequency rises.
- Such an element results from the association of a perfect transformer TP, with a self-inductance L and a capacity C.
- the primary stage E 1 of the transformer T comprises a first and a second winding L 1 , L 2 , the primary circuit being connected on the one hand to the first winding L 1 and, on the other hand, by l intermediary of a capacity C, at the second winding L 2 , said second winding L 2 being mounted in series with the first winding L 1 at the terminals of the capacity C, so as to produce an oscillating circuit.
- a transformer having a primary winding provided with an intermediate socket PI and a socket at each end.
- the primary circuit connects an end socket and the intermediate socket PI to the energy source B 0 , B 1 and the two end sockets are connected together by the capacitor C.
- the inductances of the two windings L 1 and L 2 constituted respectively by the winding on either side of the intermediate tap, are in series in the oscillating circuit which includes the capacity C.
- the high frequency resonant transformer series incorporates the self L and the transformer TP on the same magnetic circuit and thanks to a particular geometrical arrangement of the windings on the magnetic circuit is carried out between the windings couplings adapted to the operation of the load of use likely to be powered.
- Such a transformer consists of three coil carcasses assembled and remains particularly expensive, especially in a mass production application.
- FIGS. 2 and 3 which are embodiments of transformers according to the invention show a transformer T consisting of a ferrite 1, a carcass 2 comprising coils 3, 4 and 5 carrying the so-called primary windings L 1 and L 2 and a secondary winding L 3 .
- An arrangement of the windings L 1 and L 2 in an embodiment as shown schematically in Figure 2 results in a relatively weak coupling between the windings L 1 and L 2 .
- the two windings of the primary stage have a mutual coupling coefficient, or degree of coupling, between 0.5 and 0.7 and have values of substantially equal self-inductance. With such values of the coupling coefficient, we reach a coefficient effective coupling of the order of 0.9.
- the secondary circuit including a load of use can be realized according to several variants. Two particularly interesting versions for feeding a magnetron are illustrated in Figures 5 and 6.
- the secondary circuit comprises rectifying means.
- the use load U has two supply terminals M 1 , M 2 connected, on the one hand, to a first terminal N 1 of the secondary winding L 3 , respectively by two diodes D 1 and D 2 polarized so opposite to each other, and, on the other hand, to a second terminal N 2 of the secondary winding L 3 respectively by two capacitors C 1 and C 2 .
- the circuit comprises a magnetron M directly connected to the terminals of the secondary winding L 3 and a filtering capacity connected in parallel to the terminals of the magnetron.
- the capacitor Cf represented in FIG. 6 and which is connected in parallel to the magnetron M in fact represents the association of several capacitors, in particular of filtering capacitors and of capacitors internal to the magnetron.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Description
- la figure 1 est une vue du schéma électrique du transformateur et du circuit résonnant selon l'invention,
- les figures 2 et 3 sont des vues en coupe de différentes géométries de réalisation d'un transformateur selon l'invention,
- la figure 4 est un schéma équivalent d'un transformateur à résonance du type connu,
- les figures 5 et 6 sont des vues schématiques de deux variantes de réalisation du circuit secondaire dans un générateur selon l'invention.
- l'enroulement de l'étage secondaire du transformateur doit se comporter comme un circuit selfique, notamment lorsqu'il est relié à des moyens de redressement comportant par exemple des diodes, de manière à limiter les contraintes sur les diodes ;
- la self L servant à réaliser le circuit oscillant doit être assez fortement couplée avec la self de l'enroulement primaire du transformateur T ;
- la valeur de la self de l'étage primaire doit être assez faible mais l'enroulement primaire doit cependant présenter un nombre de tours assez grand en raison notamment de l'induction maximale admissible, avant saturation du circuit magnétique ;
- l'enroulement secondaire doit enfin être géométriquement séparé, particulièrement pour assurer une bonne isolation de la haute tension de l'étage secondaire.
Claims (7)
- Générateur de haute tension destiné à l'alimentation d'au moins une charge d'utilisation du type unidirectionnel telle que, par exemple, un magnétron ou un tube électronique et comprenant un transformateur (T) élévateur de tension comportant un étage primaire (E1) connecté à un circuit primaire (CP), et un étage secondaire (E2) présentant un enroulement (L3) connecté à un circuit secondaire (S0,S1) comprenant la charge d'utilisation, ledit circuit primaire (CP) reliant l'étage primaire (E1) du transformateur (T) à une source d'énergie électrique (B0,B1) et comportant des moyens de commutation (K) de manière à alimenter le transformateur en courant haute fréquence,
l'étage primaire (E1) du transformateur (T) comprenant un premier et un second enroulements (L1,L2) montés en une liaison série présentant une prise intermédiaire (PI) et deux prises d'extrémités, le circuit primaire (CP) étant relié, d'une part, directement à la prise intermédiaire caractérisé en ce que le circuit primaire est relié, d'autre part, à l'une des prises d'extrémités via lesdits moyens de commutation (K), et en ce qu'une capacité (C) relie les deux prises d'extrémités de manière à réaliser, avec le premier et le second enroulements, un circuit oscillant. - Générateur de haute tension selon la revendication 1,
caractérisé en ce que les deux enroulements de l'étage primaire ont un coefficient de couplage mutuel compris entre 0,5 et 0,7 et présentent des valeurs de self-inductance sensiblement égales. - Générateur de haute tension selon la revendication 1 ou 2,
caractérisé en ce que les deux enroulements des étages primaire et secondaire sont réalisés sur une seule carcasse. - Générateur de haute tension selon l'une quelconque des revendications précédentes,
caractérisé en ce que le circuit secondaire comprend en outre des moyens de redressement. - Générateur de haute tension selon la revendication 4,
caractérisé en ce que la charge d'utilisation (U) présente deux bornes d'alimentation (M1,M2) reliées, d'une part, à une première borne (N1) de l'enroulement secondaire (L3) par respectivement deux diodes de redressement (D1,D2) polarisées de façon opposée l'une par rapport à l'autre, et, d'autre part, à une seconde borne (N2) de l'enroulement secondaire (L3) respectivement par deux capacités (C1,C2). - Générateur de haute tension selon l'une quelconque des revendications 1 à 3,
caractérisé en ce que le circuit secondaire comprend une capacité de filtrage branchée en parallèle aux bornes d'un magnétron. - Générateur selon l'une quelconque des revendications précédentes,
caractérisé en ce que les moyens de commutation sont des commutateurs du type IGBT ou MCT.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9307565A FR2707052B1 (fr) | 1993-06-22 | 1993-06-22 | |
FR9307565 | 1993-06-22 | ||
PCT/FR1994/000748 WO1995001083A1 (fr) | 1993-06-22 | 1994-06-21 | Generateur de haute tension |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0705528A1 EP0705528A1 (fr) | 1996-04-10 |
EP0705528B1 true EP0705528B1 (fr) | 1998-02-11 |
Family
ID=9448419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94920496A Expired - Lifetime EP0705528B1 (fr) | 1993-06-22 | 1994-06-21 | Generateur de haute tension |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0705528B1 (fr) |
DE (1) | DE69408535T2 (fr) |
FR (1) | FR2707052B1 (fr) |
WO (1) | WO1995001083A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20020071126A (ko) * | 2001-03-03 | 2002-09-12 | 주식회사 테크노.티 | 인터넷상에서 전송된 영상을 입체로 볼 수 있도록 한 시스템 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2180442A1 (fr) * | 1972-04-17 | 1973-11-30 | Tibbs Christopher | |
JPS6049554A (ja) * | 1983-08-30 | 1985-03-18 | Mitsubishi Electric Corp | マイクロ波放電光源装置用電源装置 |
JPS61259488A (ja) * | 1985-05-14 | 1986-11-17 | 松下電器産業株式会社 | 高周波加熱装置 |
DE3853733T2 (de) * | 1987-02-10 | 1996-02-29 | Matsushita Electric Ind Co Ltd | Hochfrequenz-Heizapparat. |
US4747034A (en) * | 1987-03-05 | 1988-05-24 | David V. Dickey | High efficiency battery adapter |
JPH01313884A (ja) * | 1988-06-13 | 1989-12-19 | Sharp Corp | 高周波加熱装置 |
US4882666A (en) * | 1989-03-23 | 1989-11-21 | North American Philips Corporation | High frequency high voltage power supply with controlled output power |
JPH03295189A (ja) * | 1990-03-28 | 1991-12-26 | Sharp Corp | インバータ電子レンジの駆動回路 |
-
1993
- 1993-06-22 FR FR9307565A patent/FR2707052B1/fr not_active Expired - Lifetime
-
1994
- 1994-06-21 WO PCT/FR1994/000748 patent/WO1995001083A1/fr active IP Right Grant
- 1994-06-21 DE DE69408535T patent/DE69408535T2/de not_active Expired - Fee Related
- 1994-06-21 EP EP94920496A patent/EP0705528B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2707052B1 (fr) | 1996-10-11 |
FR2707052A1 (fr) | 1994-12-30 |
EP0705528A1 (fr) | 1996-04-10 |
DE69408535T2 (de) | 1998-07-30 |
DE69408535D1 (de) | 1998-03-19 |
WO1995001083A1 (fr) | 1995-01-05 |
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