EP0851711A1 - Elektrisches induktionsheizgerat - Google Patents

Elektrisches induktionsheizgerat Download PDF

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Publication number
EP0851711A1
EP0851711A1 EP96921174A EP96921174A EP0851711A1 EP 0851711 A1 EP0851711 A1 EP 0851711A1 EP 96921174 A EP96921174 A EP 96921174A EP 96921174 A EP96921174 A EP 96921174A EP 0851711 A1 EP0851711 A1 EP 0851711A1
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EP
European Patent Office
Prior art keywords
unit
generator
input
power
output
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.)
Withdrawn
Application number
EP96921174A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0851711A4 (lt
Inventor
Vasily Grigorievich Pereyaslavsky
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0851711A1 publication Critical patent/EP0851711A1/de
Publication of EP0851711A4 publication Critical patent/EP0851711A4/xx
Withdrawn legal-status Critical Current

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    • 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
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the present invention relates to the field of induction heaters and particularly relates to cookers with induction heating and radiators with induction heating of water and air.
  • a cooker with induction heating is known (JP, 55 - 27234, 1987), which is an inverter which is the DC energy converted into radio frequency energy, and a Control circuit contains.
  • the inverter includes an induction heating coil, a semiconductor power switch that is connected in series with the inductance coil, and one Resonance capacitor.
  • the control circuit contains a sawtooth voltage generator, that works synchronously with the switch, a limitation circuit for minimum pulse width, a circuit having a comparator for pulse width control.
  • the advantage of the known device is that a Correction of voltage jumps in the primary electrical power source thanks to changing the shape of the output signal of the generator is possible on a signal that has a minimal pulse width pretends.
  • a cooker with induction heating is known (JP, 59 - 250841, 1987), which an inverter which converts the direct current energy into the radio frequency energy, and contains a control circuit.
  • the inverter includes one Induction heating coil, a resonance capacitor and a semiconductor power switch.
  • the control circuit contains a sensor for the inverter input current, a supply voltage sensor, a switch voltage transmitter, one after the Diagram of a comparator designed as a differential amplifier, which compares and amplifies the signals from the supply voltage transmitter and arrive from the switch voltage transmitter, one Minimum load generator, which is that of the input current generator and the Comparator compares incoming signals and those from the inverter completed generation prevents one Switch current monitoring circuit for vibration control.
  • the known device allows automatic Correction of their operating modes depending on the minimum load of the object to be heated and its presence the voltage jumps of the primary electrical power source perform.
  • this facility solves the problem of automatically correcting their operating modes in a sufficiently narrow range of voltage jumps in the primary current source and does not solve the problem of automatic Correction of their operating modes depending on the dimensions and the type of object to be heated when keeping constant the size of the object to be heated required performance under the conditions of an unstable Voltage of the primary electrical power source.
  • the invention has for its object an electrical Induction heater with such construction elements and to create connections that would enable a sufficient automatic correction of the operating modes the device to keep the the required power quantity supplied to the object to be heated regardless of the type and dimensions of the to be heated Object and possibly simultaneous action the external destabilizing factors, including that Voltage jumps of the primary electrical supply source by far Range from 180 V to 250 V.
  • This task is done by creating an electrical Induction heater released, containing a food part, an inductor circuit, a power switch block, a monitoring unit for the voltage of the power switch collectors, a donor for determining the existence of a object to be heated and a unit for determining the Pulsation level, its input with the inductor circuit and connected to an electrical primary power source Feed part is connected, it being connected in series according to the invention: a load temperature sensor, a Power control unit, a controlled mother generator and a power amplifier and a second temperature sensor, a starter unit, two high voltage dividers, one unit for frequency adjustment of the generator, a power limiting unit, an acoustic signaling unit, a generator blocking unit additionally contains the first output connected to the acoustic signaling unit is the second output with the second input of the controlled mother generator is connected, the third output connected to the second input of the power control unit is the first input with the first output of the load temperature sensor is connected to the third input via the Monitoring unit for the voltage of the power switch collector
  • the heating effect of ferromagnetics in an alternating magnetic field exploited high frequency of change.
  • the magnetic field induces in the ferromagnetic eddy currents which are the energy deg convert magnetic field into heat energy, whose Size squared of the frequency of change of the magnetic field is directly promotional.
  • the actual electric induction heater provides a controlled inverter, which is the one from the power supply rectified and smoothed voltage of the electrical Converted primary power source into alternating current. Under the influence this current becomes magnetic through the inductor circuit Generated field in which the object to be heated has just been introduced is depending on the material from which it is made and a change in the external dimensions Operating modes of the inverter.
  • a normal one Operation of the inverter is thanks to an automatic Correction of its operating modes in different objects to be heated and, if necessary, simultaneous action the external destabilizing factors, including that Voltage jumps of the primary electrical power source by far Range through all other units of the present invention ensured.
  • the controlled mother generator (executed for example based on the circuit - Birjukov S.A. "Tsifrovye ustroistva na integralnykh mikroskhemakh”/ With IC components equipped digital devices /, M .: Verlag “Radio i svyaz”, 1991, P. 52) works in the self-oscillation state and generates impulses with a frequency of 25 to 45 Hz, which after amplification through the power amplifier the power transistor circuits the power switch block (executed e.g. on Basis of the circuit - Naivelt G.S. "Istochniki elektropitania REA "/ electrical power sources REA /, reference book, M .: Verlag "Radio i svyaz", 1989, p. 419) control.
  • the controlled mother generator is in resonance with the free natural vibrations of the inductor circuit, which from a flat inductance coil and a resonance capacitance consists.
  • the unit for determining the pulsation level (executed e.g. based on the circuit - Gorshkov B.I. "Radioelektronnye ustroistva” / Radioelectronic devices /, M .: Verlag "Radio i svyaz", 1987, p. 393, fig. 17.246), which is a doubling circuit of the voltage by the Is part of the rectified pulsations, separates one Supply voltage alternating component, the value of which with a Increase in inverter current due to an increase in Dimensions of the object to be heated increases and forms them into DC voltage.
  • the unit for frequency adjustment of the generator on an operational amplifier (executed for example based on the circuit - "Sovremennye lineinye integralnye mikroskhemy i ikh primenenie "/ Modern linear IC components and their use /, translation from English edited by Galperin M.V., M .: Verlag "Energia", 1980, p. 56) corrects the pulse frequency of the controlled Mother generator depending on the amount of the Unit for determining the pulsation level of the incoming DC voltage.
  • the power control unit based on a Transistor regulator, manages the duration control of pulses generated by the controlled mother generator, the duration of the power supplied to the object to be heated and consequently the intensity of the heating of the material to be heated Object.
  • a change in the object to be heated supplied power can be both thanks to the user the power controller existing power controller, as even in the automatic operating state of the electric induction heater be made.
  • the one on an operational amplifier after the current amplifier circuit installed power limiting unit (executed for example, based on the circuit - "Sovremennye lineinye integralnye mikroskhemy i ikh primenenie "/ modernity linear IC components and their use /, translation from English with the editorial staff of Galperin M.V., M .: Verlag "Energia", 1980, p. 56) monitors the voltage level at the output the unit for determining the pulsation level and works when a certain threshold is reached the same on the power control unit, the duration of pulses generated by the controlled mother generator shortened by taking a nominal operating state of the inverter guaranteed and secures it against overloads.
  • the generator blocking unit (executed for example based on a circuit that the Schmitt trigger circuit - Veniaminov V.N., Lebedev O.N., Miroshnichenko A.I. "IC components and their use", M .: Verlag “Radio i svyaz ", 1989, p. 122, - and a pulse stretcher - Gorshkov B.I. "Radioelektronnye ustroistva” / Radioelectronic devices /, M .: Verlag "Radio i svyaz", 1984, p. 288, united) blocked when a reset signal arrives at its input, the work of the controlled mother generator. Unblocking of the controlled mother generator takes about 2 seconds Termination of the action of the reset signal on the generator blocking unit instead of.
  • the generator blocking unit acts on the power control unit so that after unblocking the controlled mother generator generates impulses of minimal duration in the first moment.
  • the acoustic signaling unit gives for a short Time an acoustic signal, if necessary a reset signal Generator blocking unit arrives.
  • the starting unit (for example based on the Schmitt trigger circuit, at its output via a transistor switch an optothyristor is connected - Gorshkov BI. "Radioelektronnye ustroistva” / Radioelectronic devices /, M .: Verlag “Radio i svyaz", 1984, p. 302), closes overloads during operation of the electrical induction heater characterized in that a current limitation the charging of the electrolytic capacitors of the food section is ensured and the occasion of the controlled mother generator for the duration of all transition processes in the device by acting on the generator blocking unit is held back.
  • the giver for determining the presence of one too heating object (carried out, for example, on the basis of the Comparator circuit - "Sovremennye lineinye integralnye mikroskhemy i ikh primenenie "/ Modern linear IC components and their use /, translation from English under editors by Galperin M.V., M .: Verlag "Energia", 1980, p. 50) Tensions that arrive at its two entrances. The voltage from the collectors reaches the first input the power switch block transistors through the high voltage divider is brought to a certain level. The second input is the voltage across the other high voltage divider fed from the output of the dining section.
  • the second input is the voltage across the other high voltage divider fed from the output of the dining section.
  • the voltage from the output of the unit of the pulsation level which is the size of the current consumption of the inverter.
  • the pulse amplitude at the collectors of the power switch block transistors becomes lower than at its second entrance, at which the tension also increased and an increase in the the unit for determining the pulsation level arriving Voltage due to the increase in the inverter's absorption current grows. In this case the reset signal not formed and the inverter continues to operate normally.
  • the monitoring unit for the voltage of the collectors the current switch (equipped with a trangistor switch and executed for example on the basis of the circuit - Reike Ch.D. "55 elektronnykh skhem signalizatsii” / 55 electronic signaling circuits /, M .: Publishing house “Energoatomizdat", 1991, P. 47) tracks the pulse amplitude from the output of the power switch block and ensures in the event of their exaggeration 1100 V the generation of a signal to the generator blocking unit arrives, which cancels the work of the inverter and the power transistors of the power switch block protects against voltage overloads.
  • the load temperature sensor ensures the overwashing the temperature of the object to be heated.
  • the Load temperature sensor by pointing to the power control unit acts, the pulse duration of the controlled mother generator gradually to a minimum, which in turn reduces leads to the warming intensity of the object.
  • the load temperature sensor interrupts the generator blocking unit does the work of the controlled Mother generator until the temperature drops and the falls below the set threshold.
  • All assemblies and units of the present invention are from an electrical (not shown in the drawing) Secondary power source that they supplied with the required Power supplied.
  • Power supply unit for determining the pulsation level Power limitation unit - Power control unit - Inverter - power supply, - to ensure that the inverter in the operating state of an automatic stabilizer of the intake current is working.
  • the one to be warmed remains Object input power practically unchangeable despite the voltage jumps of the electrical primary current source in a wide range from 180 V to 250 V.
  • the electric induction heater contains (Fig. 1) a controlled inverter 1, which in Series connected: a controlled mother generator 2, one Power amplifier 3, a power switch block 4 and one Inductor circuit 5 includes, and a feed part 6, which with an electrical primary power source 7 and a separation capacity 8 is connected to the inductor circuit 5, a first High voltage divider 9, the input of which is connected to the collector Transistors of the power switch block 4 is connected, the first Output via a monitoring unit 10 for the voltage of the Power switch collectors with the third input of a generator blocking unit 11 is connected while the second Output with the first input of an encoder 12 for the determination the presence of an object to be heated stands, the output with the second input of the Generator blocking unit 11 is connected and the second Input is connected to a common point which the input of a unit 13 for frequency adjustment of the Generator, the input of a power limiting unit 14, the output of a second high voltage divider 15 and Output of a unit 16 for determining the pulsation level connects, whose entrance is placed
  • the power control unit 20 includes a power controller 22.
  • the load temperature sensor 21 contains one Temperature controller 23.
  • the electric induction heater works as follows.
  • the starter unit 17 After switching on the electric induction heater leads the starter unit 17 immediately a reset pulse Input of the generator blocking unit 11 to.
  • the generator blocking unit 11 holds the occasion of the controlled mother generator 2 back for a time to charge the electrolytic capacitors of the filter of the feed part 6 is sufficient.
  • the starter unit 17 also ensures Limiting the charging current of these capacities.
  • the reset pulse from the input of the generator blocking unit 11 is removed after about 2 seconds the controlled mother generator 2 started.
  • the controlled one Mother generator 2 begins its work with the generation of impulses of minimal duration.
  • the Encoder 12 for determining the presence of one to be heated Object a reset pulse that is applied to the generator blocking unit 11 arrives, which the controlled mother generator 2 blocked for about 2 seconds, after which the Cycle repeated.
  • Each generation of the reset pulse is accompanied by an acoustic Signal accompanied by the acoustic signaling unit 19 is delivered.
  • the reset pulse at the output of the encoder 12 for the determination the presence of an object to be heated is not formed.
  • the controlled mother generator 2 is not blocked and the electric induction heater changes to the operating state.
  • the power control unit 20 provides by a certain pulse duration of the controlled mother generator 2 specifies a heating intensity required for the user of the object.
  • the power limiting unit 14 exercises monitoring the voltage at the output of the unit 16 for determination of the pulsation level. If the input current of the inverter 1 exceeds the specified permissible value the power limiting unit 14 via the power control unit 20 the supplied to the object to be heated Power, the power switch block 4 being protected from overload becomes.
  • the load temperature sensor 21 is the Temperature of the object to be heated on a certain Maintain level.
  • the absorption current (Fig. 3) of the heating object in the present invention remains constant and from the voltage jumps of the electrical Primary power source in a wide range from 180 V to 250 V independently is, while in the known device, the recording current depending on the voltage level of the electrical primary current source changes almost 1.5 times.
  • the invention is made of modern radio-electronic elements easy to manufacture based on existing technology and can be used in the production of cookers with induction heating and radiators with induction heating of water and air are most effectively used.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)
EP96921174A 1995-06-21 1996-06-19 Elektrisches induktionsheizgerat Withdrawn EP0851711A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU95110354 1995-06-21
RU95110354 1995-06-21
PCT/RU1996/000164 WO1997001261A1 (fr) 1995-06-21 1996-06-19 Appareil de chauffage electrique par induction

Publications (2)

Publication Number Publication Date
EP0851711A1 true EP0851711A1 (de) 1998-07-01
EP0851711A4 EP0851711A4 (lt) 1998-07-01

Family

ID=20169107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96921174A Withdrawn EP0851711A1 (de) 1995-06-21 1996-06-19 Elektrisches induktionsheizgerat

Country Status (9)

Country Link
EP (1) EP0851711A1 (lt)
AU (1) AU6246196A (lt)
BG (1) BG63359B1 (lt)
CZ (1) CZ286611B6 (lt)
EA (1) EA000253B1 (lt)
HU (1) HUP9802079A3 (lt)
LT (1) LT4373B (lt)
PL (1) PL180559B1 (lt)
WO (1) WO1997001261A1 (lt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2528411A3 (de) * 2011-05-25 2013-02-13 Teka Küchentechnik GmbH Induktionskochfeld und Kochgerät
CN106678899A (zh) * 2015-11-11 2017-05-17 佛山市顺德区美的电热电器制造有限公司 电磁加热系统及用于电磁加热系统的检测锅具方法和装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6303912B1 (en) * 1997-03-13 2001-10-16 Aktiebolaget Electrolux Induction heating kitchen appliance and system for use

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612707A1 (de) * 1985-04-17 1986-10-23 Sanyo Electric Co., Ltd., Moriguchi, Osaka Induktionsheizvorrichtung mit falschlastdetektor
JPH02280716A (ja) * 1989-04-24 1990-11-16 Sharp Corp 自動炊飯器

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040364B2 (ja) 1978-08-18 1985-09-10 旭硝子株式会社 内部に仕切板を有する繊維強化熱硬化性樹脂成形品の成形方法
JPS635196Y2 (lt) 1984-11-27 1988-02-12
DE3704581A1 (de) 1987-02-13 1988-09-15 Thomson Brandt Gmbh Kochstelle mit induktiv geheizten kochplatten
FR2634615B1 (fr) 1988-07-25 1996-04-12 Dietrich & Cie De Plaque de cuisson a induction comportant un dispositif de visualisation de la puissance effectivement transmise a l'ustensile
JP2862569B2 (ja) * 1989-06-30 1999-03-03 株式会社東芝 電磁調理器
US5408073A (en) * 1993-02-20 1995-04-18 Samsung Electronics Co., Ltd. Overheat prevention circuit for electromagnetic induction heating cooker
US5523631A (en) * 1993-08-25 1996-06-04 Inductotherm Corp. Control system for powering plural inductive loads from a single inverter source
FR2718318B1 (fr) * 1994-03-31 1996-11-29 Moulinex Sa Dispositif de commande et de contrôle automatiques de puissance pour un appareil de chauffage par induction et procédé de mise en Óoeuvre de ce dispositif.
KR0129233B1 (ko) * 1994-05-17 1998-04-09 이헌조 고주파 가열 장치의 인버터 제어회로

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612707A1 (de) * 1985-04-17 1986-10-23 Sanyo Electric Co., Ltd., Moriguchi, Osaka Induktionsheizvorrichtung mit falschlastdetektor
JPH02280716A (ja) * 1989-04-24 1990-11-16 Sharp Corp 自動炊飯器

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 048 (C-0802), 5 February 1991 & JP 02 280716 A (SHARP CORP), 16 November 1990, *
See also references of WO9701261A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2528411A3 (de) * 2011-05-25 2013-02-13 Teka Küchentechnik GmbH Induktionskochfeld und Kochgerät
CN106678899A (zh) * 2015-11-11 2017-05-17 佛山市顺德区美的电热电器制造有限公司 电磁加热系统及用于电磁加热系统的检测锅具方法和装置

Also Published As

Publication number Publication date
CZ286611B6 (cs) 2000-05-17
EA000253B1 (ru) 1999-02-25
CZ405397A3 (cs) 1998-06-17
AU6246196A (en) 1997-01-22
EA199800067A1 (ru) 1998-08-27
LT97192A (lt) 1998-05-25
BG102165A (en) 1998-08-31
HUP9802079A2 (hu) 1998-12-28
EP0851711A4 (lt) 1998-07-01
PL180559B1 (pl) 2001-02-28
PL324260A1 (en) 1998-05-11
LT4373B (lt) 1998-08-25
WO1997001261A1 (fr) 1997-01-09
HUP9802079A3 (en) 2000-03-28
BG63359B1 (bg) 2001-10-31

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