US3275784A - Induction heating coil - Google Patents
Induction heating coil Download PDFInfo
- Publication number
- US3275784A US3275784A US294628A US29462863A US3275784A US 3275784 A US3275784 A US 3275784A US 294628 A US294628 A US 294628A US 29462863 A US29462863 A US 29462863A US 3275784 A US3275784 A US 3275784A
- Authority
- US
- United States
- Prior art keywords
- coil
- section
- sections
- current
- pot
- 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
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- the present invention relates to induction heating and is concerned with the construction of a coupling coil for inducing eddy currents in a surface such, for example, as the bottom wall of a pot to heat it for cooking.
- the invention is concerned with cases in which the coil may be required to heat surfaces of different sizes, for example pots of different diameters.
- a coupling coil for inducing eddy currents in surfaces includes two or more sections covering different areas of the surface to be heated and electrically connected in parallel.
- one section surrounds another, for example, in the case of circular coils the two sections may be concentric.
- a coupling coil includes two sections wound spirally in the same direction one within the other, with their inner ends connected to the other terminal.
- the inner end of the inner section and the outer end of the outer section are connected to one terminal of the source of current, while the outer end of the inner section and the inner end of the outer section are connected to the other terminal.
- two sections are wound spirally in opposite directions, one within the other, the inner end of the inner section and the outer end of the outer section are connected to one terminal of the current supply, while the outer end of the inner section and the inner end of the outer section are connected to the other terminal.
- the sections may have approximately equal surface heating areas.
- the invention is primarily concerned with a boiling ring adapted to operate with pots of different sizes.
- the coupling coil should have a diameter roughly equal to that of the largest pot.
- the current flowing in the coil will depend upon the fact that the coil is magnetically coupled to the bottom of the pot which functions as a short-circuited transformer winding.
- a pot is placed on a coupling coil comprising a single winding and the bottom wall of the pot is smaller in area than the coil, the outer portion of the coil will not be coupled to the bottom of the pot and will present an increased inductance thereby cutting down the current not only in this outer portion of the coil but in the inner portion as well.
- the heating power will generally be reduced to a negligible amount.
- a coupling coil constructed in sections which are connected in parallel.
- FIGURES l and 2 are respectively diagrammatic views 3,275,784 Patented Sept. 27, 1966 of two forms of coupling coils with the sections connected in different ways, and
- FIGURE 3 is a sectional view of FIGURE 1 to which has been added a top plate for the coupling coil and on which the pots to be heated are supported.
- the coil 10 comprises two sections 11 and 12 each of fiat annular form wound from narrow conducting tape.
- the ends 13, 14, of the inner section 11 and the ends 15 and 16 of the outer section 12 are brought out and connected to each other so that the two sections are connected in parallel.
- the inner end 13* of the inner section 11 and the inner end 15 of the outer section 1a are connected to a lead 17 while the outer end 14 of the inner section 11 and the outer end 16 of the outer section 12 are connected to a lead 18.
- the leads 17 and 18 are connected by conductors 19 and 20 respectively to -a high frequency generator 21 connected to a source of current 22, and the generator 21 supplies current at a frequency up to 20,000 cycles per second.
- the top surface of the coil 10 is suitably covered with a thin plate 23 of stainless steel on which the pot to be heated is supported.
- the outer end .14 of the inner section 11 and the inner end 15 of the outer section 12 are connected to one line conductor .19 while the inner end 13 of the inner section 11 and the outer end 16 of the outer section .12 are connected to the other line conductor 20*.
- FIGURE 2 The arrangement of FIGURE 2 is similar to that of FIGURE 1 except that the coil 24 has its inner section 25 Wound counterclockwise while the outer section 26 is wound clockwise, the inner end 27 of the inner section 25 and the outer end 28 of the outer section 26 being connected to a lead 29, while the outer end 30 of the inner section 25 and the neighboring inner end 31 of the outer section 26 are connected together at 32 and joined to a lead 33.
- Conductors 3'4 and 35 connect the leads 29 and 33 to a suitable high frequency generator 36 which is connected to a source of current 37.
- the coil 24 is also supplied with an unshown top plate 23 to support the pots to be heated. This arrangement avoids conductors in close proximity at substantially different voltages but also has the characteristic that the inductance rises when the pot is removed.
- the impedances of the two coil sections may be made approximately equal, and this condition is general-ly satisfied when the coils have approximately equal surface areas, for example the inner section could have a diameter of five inches and the outer section an external diameter of seven inches.
- the sections connected in parallel and a large pot in position on the top plate 23 for the coils 10 or 24 the currents in the two sections will then be approximately equal. If any pot large enough to cover the outer sections is placed in position both sections of each coil 10 and 24 will contribute power and the full 7 output vw'll be produced. With pots that cover the inner all pots on a cooking stove and it will be unnecessary to provide different sized coils for different sized pots, thus, simplifying manufacture and increasing flexibility for the user.
- the coupling coils may be divided into more than two sections. Where a number of sections are employed it is possible by selecting a suitable combination of sections wound or connected for current flow in the same direction, and sections wound or connected for current flow in opposite directions, to ensure that no change of inductance occurs when the pot is removed.
- a coupling coil for inducing eddy currents in surfaces such as the bottom walls of pots of different sizes to heat the pots said coil comprising at least two coi'l sections one with-in the other to cover different areas of the surface of the pot being heated and wound spirally in opposite directions, means connecting the inner end of the inner c-oil section and the outer end of the outer coil section to one terminal of the source of current, and means connecting the outer end of the inner coil section and the inner end of the outer coil section to the other terminal of the source of current, whereby said coil sections are connected in parallel to a source of current.
- a flat coupling coil for inducing eddy currents in fiat surfaces such as the bottom walls of pots of dilferent sizes to heat the pots, said coil comprising at least two coil sections, one coil section surrounding the other coil section, said coil sections wound spirally in the same direction one within the other, to cover different areas of the surface of the pot being heated, means connecting the inner ends of each coil section to one terminal of the source of current, and means connecting the outer ends of each coil section to the other terminal of the source of current.
- a flat coupling coil for inducing eddy currents in flat surfaces such as the bottom Walls of pots of different sizes to heat the pots, said coil comprising at least two coil sections one coil section surrounding the other coil section, said coil sections wound spirally in the same direction one within the other to cover different areas of the surface of the pot being heated, means connecting the inner end of the inner coil section and the outer end of the outer coil section to one terminal of the source of current, and means connecting the outer end of the inner coil section and the inner end of the outer coil section to the other terminal of the source of current.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Cookers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB30614/62A GB1048081A (en) | 1962-08-09 | 1962-08-09 | Improvements relating to induction heating |
Publications (1)
Publication Number | Publication Date |
---|---|
US3275784A true US3275784A (en) | 1966-09-27 |
Family
ID=10310422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US294628A Expired - Lifetime US3275784A (en) | 1962-08-09 | 1963-07-12 | Induction heating coil |
Country Status (3)
Country | Link |
---|---|
US (1) | US3275784A (ja) |
GB (1) | GB1048081A (ja) |
NL (1) | NL296433A (ja) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3694609A (en) * | 1971-02-01 | 1972-09-26 | Owens Illinois Inc | Method and apparatus for inductive heating |
US3710062A (en) * | 1971-04-06 | 1973-01-09 | Environment One Corp | Metal base cookware induction heating apparatus having improved power supply and gating control circuit using infra-red temperature sensor and improved induction heating coil arrangement |
US3740513A (en) * | 1971-09-23 | 1973-06-19 | Environment One Corp | Improved consumer oriented combined counter and cooking unit using induction heating |
US3906181A (en) * | 1972-08-18 | 1975-09-16 | Mitsubishi Electric Corp | Induction heating apparatus for minimizing vibration and noise |
US3949183A (en) * | 1972-10-20 | 1976-04-06 | Mitsubishi Denki Kabushiki Kaisha | Cover plate for induction heating apparatus |
US4029926A (en) * | 1974-10-29 | 1977-06-14 | Roper Corporation | Work coil for use in an induction cooking appliance |
JPS5564295U (ja) * | 1979-09-28 | 1980-05-01 | ||
US4453067A (en) * | 1982-01-11 | 1984-06-05 | Whirlpool Corporation | Induction heating coil |
FR2608348A1 (fr) * | 1986-12-10 | 1988-06-17 | Electricite De France | Appareil electrique de cuisson par induction a emission d'harmoniques reduite |
EP0376760A1 (fr) * | 1988-12-27 | 1990-07-04 | Bonnet S.A. | Plaque de cuisson par chauffage par induction |
US4947464A (en) * | 1985-12-07 | 1990-08-07 | Sumitomo Electric Industries, Ltd. | Heating coil assembly for an electromagnetic induction cooking assembly |
WO1993013634A1 (de) * | 1991-12-23 | 1993-07-08 | Deutsche Thomson-Brandt Gmbh | Verfahren und vorrichtung zum induktiven beheizen von behältern unterschiedlicher grösse |
EP0716560A1 (fr) * | 1994-12-09 | 1996-06-12 | Cidelcem Industries | Dispositif de chauffage par induction de récipient et procédé de commande d'un tel dispositif |
WO2006092179A1 (de) * | 2005-03-01 | 2006-09-08 | BSH Bosch und Siemens Hausgeräte GmbH | Heizeinrichtung für ein induktionsgargerät |
US20170295611A1 (en) * | 2016-04-07 | 2017-10-12 | Andre Castro GURGEL | Electric stovetop |
WO2020122599A1 (en) | 2018-12-13 | 2020-06-18 | Samsung Electronics Co., Ltd. | Induction heating apparatus |
US20210227643A1 (en) * | 2020-01-16 | 2021-07-22 | Samsung Electronics Co., Ltd. | Induction heating apparatus and method of controlling the same |
EP3858107A4 (en) * | 2018-12-13 | 2021-11-24 | Samsung Electronics Co., Ltd. | INDUCTION HEATING DEVICE |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2198020B (en) * | 1986-11-25 | 1990-10-10 | Ti Creda Ltd | Improvements in or relating to induction heating coils for cooking appliances |
GB2198618B (en) * | 1986-11-25 | 1990-06-13 | Ti Creda Ltd | Improvements in or relating to induction heating circuits for cooking appliances |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1052119A (en) * | 1911-10-30 | 1913-02-04 | John L Anderson | Universal electric induction heating and cooking element. |
US1924409A (en) * | 1929-08-28 | 1933-08-29 | Manson George James | Heated die for drying fibrous articles |
US1992515A (en) * | 1928-12-29 | 1935-02-26 | Aktis Studiengesellschaft Fur | Apparatus for the preparation of foodstuff |
DE808474C (de) * | 1948-10-26 | 1951-07-16 | Conz Elek Citaets Ges M B H | Einrichtung zum Trocknen lackierter Bleche nach dem Wirbelstromverfahren |
US2659069A (en) * | 1951-09-12 | 1953-11-10 | Magic Chef Inc | Operating signal for electric ranges |
FR1111423A (fr) * | 1953-11-04 | 1956-02-27 | Brown | Inducteur plat bifilaire |
US2752472A (en) * | 1953-04-21 | 1956-06-26 | Westinghouse Electric Corp | Induction heater coil |
US3068340A (en) * | 1957-09-16 | 1962-12-11 | Gen Motors Corp | Domestic appliance |
US3108169A (en) * | 1959-08-14 | 1963-10-22 | Siemens Ag | Device for floating zone-melting of semiconductor rods |
-
0
- NL NL296433D patent/NL296433A/xx unknown
-
1962
- 1962-08-09 GB GB30614/62A patent/GB1048081A/en not_active Expired
-
1963
- 1963-07-12 US US294628A patent/US3275784A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1052119A (en) * | 1911-10-30 | 1913-02-04 | John L Anderson | Universal electric induction heating and cooking element. |
US1992515A (en) * | 1928-12-29 | 1935-02-26 | Aktis Studiengesellschaft Fur | Apparatus for the preparation of foodstuff |
US1924409A (en) * | 1929-08-28 | 1933-08-29 | Manson George James | Heated die for drying fibrous articles |
DE808474C (de) * | 1948-10-26 | 1951-07-16 | Conz Elek Citaets Ges M B H | Einrichtung zum Trocknen lackierter Bleche nach dem Wirbelstromverfahren |
US2659069A (en) * | 1951-09-12 | 1953-11-10 | Magic Chef Inc | Operating signal for electric ranges |
US2752472A (en) * | 1953-04-21 | 1956-06-26 | Westinghouse Electric Corp | Induction heater coil |
FR1111423A (fr) * | 1953-11-04 | 1956-02-27 | Brown | Inducteur plat bifilaire |
US3068340A (en) * | 1957-09-16 | 1962-12-11 | Gen Motors Corp | Domestic appliance |
US3108169A (en) * | 1959-08-14 | 1963-10-22 | Siemens Ag | Device for floating zone-melting of semiconductor rods |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3694609A (en) * | 1971-02-01 | 1972-09-26 | Owens Illinois Inc | Method and apparatus for inductive heating |
US3710062A (en) * | 1971-04-06 | 1973-01-09 | Environment One Corp | Metal base cookware induction heating apparatus having improved power supply and gating control circuit using infra-red temperature sensor and improved induction heating coil arrangement |
US3740513A (en) * | 1971-09-23 | 1973-06-19 | Environment One Corp | Improved consumer oriented combined counter and cooking unit using induction heating |
US3906181A (en) * | 1972-08-18 | 1975-09-16 | Mitsubishi Electric Corp | Induction heating apparatus for minimizing vibration and noise |
US3949183A (en) * | 1972-10-20 | 1976-04-06 | Mitsubishi Denki Kabushiki Kaisha | Cover plate for induction heating apparatus |
US4029926A (en) * | 1974-10-29 | 1977-06-14 | Roper Corporation | Work coil for use in an induction cooking appliance |
US4092511A (en) * | 1974-10-29 | 1978-05-30 | Roper Corporation | Work coil for use in an induction cooking appliance |
JPS5564295U (ja) * | 1979-09-28 | 1980-05-01 | ||
US4453067A (en) * | 1982-01-11 | 1984-06-05 | Whirlpool Corporation | Induction heating coil |
US4947464A (en) * | 1985-12-07 | 1990-08-07 | Sumitomo Electric Industries, Ltd. | Heating coil assembly for an electromagnetic induction cooking assembly |
US4792652A (en) * | 1986-12-10 | 1988-12-20 | Electricite De France - Service National | Electric induction cooking appliance with reduced harmonic emission |
FR2608348A1 (fr) * | 1986-12-10 | 1988-06-17 | Electricite De France | Appareil electrique de cuisson par induction a emission d'harmoniques reduite |
BE1006691A3 (fr) * | 1986-12-10 | 1994-11-22 | Electricite De France | Appareil electrique de cuisson par induction a emission d'harmoniques reduite. |
EP0376760A1 (fr) * | 1988-12-27 | 1990-07-04 | Bonnet S.A. | Plaque de cuisson par chauffage par induction |
WO1993013634A1 (de) * | 1991-12-23 | 1993-07-08 | Deutsche Thomson-Brandt Gmbh | Verfahren und vorrichtung zum induktiven beheizen von behältern unterschiedlicher grösse |
FR2728132A1 (fr) * | 1994-12-09 | 1996-06-14 | Bonnet Sa | Dispositif de chauffage par induction de recipient et procede de commande d'un tel dispositif |
EP0716560A1 (fr) * | 1994-12-09 | 1996-06-12 | Cidelcem Industries | Dispositif de chauffage par induction de récipient et procédé de commande d'un tel dispositif |
US5808280A (en) * | 1994-12-09 | 1998-09-15 | Cidelcem Industries | Device for induction heating of a receptable and process for controlling such a device |
WO2006092179A1 (de) * | 2005-03-01 | 2006-09-08 | BSH Bosch und Siemens Hausgeräte GmbH | Heizeinrichtung für ein induktionsgargerät |
US8030601B2 (en) | 2005-03-01 | 2011-10-04 | Bsh Bosch Und Siemens Hausgeraete Gmbh | Heating device for an inductive cooking device |
US20170295611A1 (en) * | 2016-04-07 | 2017-10-12 | Andre Castro GURGEL | Electric stovetop |
WO2020122599A1 (en) | 2018-12-13 | 2020-06-18 | Samsung Electronics Co., Ltd. | Induction heating apparatus |
EP3858107A4 (en) * | 2018-12-13 | 2021-11-24 | Samsung Electronics Co., Ltd. | INDUCTION HEATING DEVICE |
US11596029B2 (en) | 2018-12-13 | 2023-02-28 | Samsung Electronics Co., Ltd. | Induction heating apparatus |
US20210227643A1 (en) * | 2020-01-16 | 2021-07-22 | Samsung Electronics Co., Ltd. | Induction heating apparatus and method of controlling the same |
Also Published As
Publication number | Publication date |
---|---|
NL296433A (ja) | |
GB1048081A (en) | 1966-11-09 |
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