EP0054445B1 - Elektronische Induktionsheizvorrichtung - Google Patents
Elektronische Induktionsheizvorrichtung Download PDFInfo
- Publication number
- EP0054445B1 EP0054445B1 EP81401726A EP81401726A EP0054445B1 EP 0054445 B1 EP0054445 B1 EP 0054445B1 EP 81401726 A EP81401726 A EP 81401726A EP 81401726 A EP81401726 A EP 81401726A EP 0054445 B1 EP0054445 B1 EP 0054445B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switches
- oscillating circuit
- circuit
- electronic
- capacitor
- 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
- 230000006698 induction Effects 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 title claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000010411 cooking Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001869 rapid Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Images
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
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
Definitions
- the present invention relates to electronic induction heating devices.
- FR-A-2 430 679 describes a device intended for electric induction cooking formed by an oscillating circuit, consisting of capacitors and a choke which acts as an inductor, inductor to which the ferromagnetic charge to be heated is coupled .
- the oscillating circuit is connected to the supply circuit by two thyristors subject to a control circuit, this circuit making the thyristors operate successively.
- a resistor and a capacitor are mounted in parallel with each thyristor to limit the variations in voltages across their terminals.
- the supply circuit acts as a DC voltage source, obtained by rectifying the mains voltage.
- DE-A-2 634 667 it describes a device intended to supply energy to the inductor of an induction furnace, this energy being conveyed by an alternating current obtained by an inverter.
- This inverter is connected to a DC power supply.
- the aim of the present invention is to eliminate one of these three conditions, in this case that relating to the fact of being able to withstand a repetitive maximum voltage in the blocked state and this, so as to produce an induction heating device, the design of which is such that it has very high reliability, despite the performance limits of electronic components currently on the market.
- the subject of the invention is an electronic induction heating device, comprising an oscillating circuit comprising a capacitor and a choke which acts as primary winding, the secondary winding being constituted by the load to be heated, this circuit oscillating being connected to the supply circuit by two electronic switches subject to a control circuit, a resistor and a capacitor being mounted in parallel with each of these switches, characterized in that the two electronic switches - for example two thyristors - are subject to a control oscillator making them operate at the resonant frequency of the oscillating circuit to open and close at the same time, these switches playing the role of impedances of very high value when they are opened.
- the oscillating circuit is connected directly to the two supply lines and, thereby, loaded with energy.
- the oscillating circuit 1 of the corresponding device is constituted by a circuit known under the name "circuit-plug".
- the inductor 2 then acts as the primary winding, the secondary being constituted by the charge to be heated, in the corresponding appliance, in this case a cooking utensil (saucepan, frying pan, etc.).
- the oscillating circuit 1 is connected to the two lines 5 and 6 of the power circuit mentation by means of two electronic switches, which are therefore arranged on the other side of this oscillating circuit.
- the oscillating circuit 1 is supplied by a direct current source, this current coming from the rectification of two half-waves of the mains voltage. It is however possible that the power supply to the oscillating circuit is provided by a DC voltage source.
- each of the electronic switches is constituted by a thyristor 7 with which is mounted in anti-parallel a diode 8 whose direction of conduction is therefore opposite.
- each of the thyristors 7 is connected to the secondary of a transformer 9, the primary of which is supplied by a control oscillator 10.
- the arrangement of the control circuit thus formed is rel that the thyristors operate at the resonant frequency of the oscillating circuit 1 by opening and closing at the same time.
- the oscillator 10 of the control circuit is of the astable type, and it is followed by one, or even several, transistor (s) making it possible to obtain compatible control pulses in duration, in polarity and in power to correctly control the power switches.
- the plug circuit is perfectly adequate to fulfill this additional role. Indeed, the overvoltage phenomena of such circuits are well known.
- This inductor can be formed in different ways, for example on air, on a nucleus of different shapes, or more simply by passing the power wire of the oscillating circuit through a toroid of good value.
- This small choke has the effect of slowing down or rather of delaying the action of the heating choke 2, which results in a conduction time of the tyristors of the order of 10 u. seconds in the example.
- the oscillating circuit is charged with energy through the two power tyristors 7.
- the plug circuit is then normally connected directly to lines 5 and 6 of the supply circuit.
- the oscillating circuit (comparable in this phase to an energy generator) will find at its terminals the open switches 7. The voltage across these terminals is indirectly linked to the internal parameters of the switches.
- each switch supports at its terminals half of the voltage developed by the oscillating circuit, ie 300 volts in the example.
- the voltage developed by this type of oscillating circuit is lower than in other types of oscillating circuits. In this case, this voltage is of the order of 600 to 700 volts instead of 800 to 900 volts.
- the particular design of the device according to the invention therefore greatly multiplies the safety coefficients, since the voltages at the terminals of the switches are divided by two.
- this design has the advantage of eliminating the usual drawbacks of electronic induction heating devices, including the risks of thermal runaway of the active components (power switch). In this case, one switch effectively protects the other, knowing that the components are never perfectly identical, and moreover, never exposed to the same temperatures.
- the main advantage of the device according to the invention lies in the fact that, for the same voltage of the oscillating circuit, the voltage safety margin of the electronic switches is considerably increased.
- the device according to the invention is not limited to the single preferred example described above.
- the oscillating circuit of this device can be produced differently.
- the power tyristors could be replaced by power transistors, with some touch-ups inherent in the equipment used.
- FIG. 3 represents the diagram of an embodiment in which the tyristors 7 of the previous example are replaced by transistors 7a.
- the present device is not limited to the production of cooking appliances for household use, since it can be the subject of various applications.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Inverter Devices (AREA)
- Air-Conditioning For Vehicles (AREA)
- Near-Field Transmission Systems (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81401726T ATE15576T1 (de) | 1980-12-05 | 1981-10-28 | Elektronische induktionsheizvorrichtung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8025847A FR2495876B1 (fr) | 1980-12-05 | 1980-12-05 | Dispositif electronique de chauffage a induction |
FR8025847 | 1980-12-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0054445A1 EP0054445A1 (de) | 1982-06-23 |
EP0054445B1 true EP0054445B1 (de) | 1985-09-11 |
Family
ID=9248708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81401726A Expired EP0054445B1 (de) | 1980-12-05 | 1981-10-28 | Elektronische Induktionsheizvorrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0054445B1 (de) |
AT (1) | ATE15576T1 (de) |
DE (1) | DE3172256D1 (de) |
FR (1) | FR2495876B1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2197995B (en) * | 1986-11-25 | 1991-06-19 | Ti Creda Ltd | Improvements in or relating to induction heating circuits for cooking appliances |
GB2198296B (en) * | 1986-11-25 | 1990-08-08 | Ti Creda Ltd | Improvements in or relating to induction heating circuits for cooking appliances |
FR2712763B1 (fr) * | 1993-11-15 | 1996-02-02 | Moulinex Sa | Générateur de courant ondulé à self saturable. |
WO1995022237A1 (en) * | 1994-02-10 | 1995-08-17 | Aktiebolaget Electrolux | An energy converter for heating units for foodstuffs |
AU1756595A (en) * | 1994-03-09 | 1995-09-25 | Aktiebolaget Electrolux | A circuit for the control of energy supply in a resonance converter |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2180584B1 (de) * | 1972-04-21 | 1976-01-16 | Thomson Csf Fr | |
US4037044A (en) * | 1975-08-04 | 1977-07-19 | Ajax Magnethermic Corporation | Power control system for single phase induction melting or heating furnace |
FR2430679A1 (fr) * | 1978-07-04 | 1980-02-01 | Orega Electro Mecanique | Circuit de securite, notamment de temperatures maximales, pour plaque de cuisson par induction |
-
1980
- 1980-12-05 FR FR8025847A patent/FR2495876B1/fr not_active Expired
-
1981
- 1981-10-28 EP EP81401726A patent/EP0054445B1/de not_active Expired
- 1981-10-28 DE DE8181401726T patent/DE3172256D1/de not_active Expired
- 1981-10-28 AT AT81401726T patent/ATE15576T1/de active
Also Published As
Publication number | Publication date |
---|---|
ATE15576T1 (de) | 1985-09-15 |
EP0054445A1 (de) | 1982-06-23 |
FR2495876B1 (fr) | 1985-06-07 |
FR2495876A1 (fr) | 1982-06-11 |
DE3172256D1 (en) | 1985-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2525412A1 (fr) | Circuit de demarrage de moteur electrique alternatif monophase | |
EP0340049A1 (de) | Versorgungseinrichtung für eine selbststrahlende Lampe | |
FR2772975A1 (fr) | Relais hybride de puissance | |
EP0054445B1 (de) | Elektronische Induktionsheizvorrichtung | |
EP0623991B1 (de) | Leistungs oder Geschwindigkeitssteuerung einer Last | |
EP0986288B1 (de) | Wechselstromwandlervorrichtung mit gesteuerter Leistungsabgabe | |
CA2087453A1 (fr) | Dispositif-variateur de l'intensite du courant electrique dans un recepteur | |
EP0031780B1 (de) | Vorrichtung zur Rückgewinnung der Energie eines Wechselrichters | |
EP0044776A1 (de) | Zerhackerschaltkreis mit freier Kommutierung | |
EP0978941B1 (de) | Elektrische Bogenerzeugungsschaltung | |
EP0843324B1 (de) | Stromversorgungsschaltung für Elektromagnet | |
EP1324478A2 (de) | Hochspannungswandler mit schneller Antwortzeit | |
CA2033030C (fr) | Circuit d'alimentation electrique d'une charge unidirectionnelle telle qu'un magnetron | |
FR2550399A1 (fr) | Dispositif d'aide a la commutation | |
EP0578575A1 (de) | Einrichtung zum Betreiben einer Entladungslampe mit einer hochfrequenten Hochspannung | |
FR2578697A2 (fr) | Convertisseur continu/alternatif pour l'alimentation d'un organe utilisateur avec une composante inductive | |
FR2513038A1 (fr) | Dispositif de demarrage d'un moteur asynchrone monophase | |
FR2571562A1 (fr) | Convertisseur continu-alternatif | |
FR2699783A1 (fr) | Générateur à induction à puissance délivrée variable. | |
EP0148085A1 (de) | Einrichtung zum Anschalten einer Stromversorgung eines Magnetrons, insbesondere für einen Mikrowellenofen | |
CH477128A (fr) | Circuit générateur d'impulsions | |
FR2502863A3 (fr) | Dispositif reducteur de tension, notamment pour materiel de soudage a l'arc | |
CH533385A (fr) | Dispositif convertisseur statique pour l'obtention de courant alternatif triphasé à partir de courant alternatif monophasé | |
CH523644A (fr) | Dispositif de commande du courant d'alimentation d'un appareil de chauffage par induction | |
FR2657487A1 (fr) | Circuit d'alimentation electrique d'une charge unidirectionnelle telle qu'un magnetron. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE GB IT LU NL SE |
|
17P | Request for examination filed |
Effective date: 19821005 |
|
ITF | It: translation for a ep patent filed | ||
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE GB IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19850911 Ref country code: AT Effective date: 19850911 |
|
REF | Corresponds to: |
Ref document number: 15576 Country of ref document: AT Date of ref document: 19850915 Kind code of ref document: T |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19850930 |
|
REF | Corresponds to: |
Ref document number: 3172256 Country of ref document: DE Date of ref document: 19851017 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19851031 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
ITTA | It: last paid annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19940914 Year of fee payment: 14 Ref country code: CH Payment date: 19940914 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19940915 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19940916 Year of fee payment: 14 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19951028 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19951031 Ref country code: CH Effective date: 19951031 Ref country code: BE Effective date: 19951031 |
|
BERE | Be: lapsed |
Owner name: ETS EUGENE SCHOLTES Effective date: 19951031 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19951028 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960801 |