EP1629698B1 - Induktionskochfeld - Google Patents

Induktionskochfeld Download PDF

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Publication number
EP1629698B1
EP1629698B1 EP03728210A EP03728210A EP1629698B1 EP 1629698 B1 EP1629698 B1 EP 1629698B1 EP 03728210 A EP03728210 A EP 03728210A EP 03728210 A EP03728210 A EP 03728210A EP 1629698 B1 EP1629698 B1 EP 1629698B1
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Prior art keywords
output
power
microprocessor
cookware
current
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French (fr)
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EP1629698A1 (de
Inventor
Baris Colak
H. Bulent Ertan
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Tubitak Uzay
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Tubitak-Bilten (Turkiye Bilimsel Ve Teknik Arastirma Kurumu-Bilgi Teknolojileri Ve Elektronik Arastirma Enstitusu)
Tubitak Biltien
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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

Definitions

  • This invention relates to an induction heating system, more particularly induction cooking appliance for use as a home appliance.
  • Induction cooking devices or cooktops are more reliable and efficient, flameless, and thus safer appliances when compared with other cooking appliances.
  • high frequency current is generated in the heating coil, which is usually coupled to a resonant capacitor.
  • the current in the heating coil generates a high frequency magnetic flux that causes an electromagnetic induction action that generates eddy currents in a removable or non-removable cookware(pan, frying pan etc), which is made of a magnetic material such as steel, iron, etc.
  • a removable or non-removable cookware pan, frying pan etc
  • the cookware and the food contained therein is heated.
  • the appliance Since the invention is related to a home appliance, the appliance should emit no noise to AC power line, should operate at unity power factor, and should have protection against hazardous conditions, such as no load, over current, over voltage, over heat protections. Another important aspect of such appliances is the reduction of the cost of the overall system.
  • a power stage produces power to perform the cooking and second, a power control, timing, and monitoring circuit operates the system and provides convenient control for a user.
  • Induction cooktops There are two types of main power stages used in induction cooktops: Single Transistored Inverter and Half Bridge Inverter.
  • Single transistored inverter is a low cost power stage with a single transistor that makes it easy to control.
  • cooktops having half-bridge inverter are two-transistored and have higher costs than those single-transistored inverters have. But they can operate in wider power ranges and in higher frequencies, which can allow the appliance to heat even magnetic materials with low resistance, such as aluminum.
  • US 4,511,781 is a system that employs a microprocessor for all the control actions, but it tries to handle all the critical and fast timing operations with the microprocessor. So a very fast and expensive microprocessor is needed. Consequently, the cost of the system increases and the system becomes less feasible.
  • microprocessors are sensitive to powerline fluctuations, which can cause random program errors and outputs. So it is not advised to solely rely on the microprocessor to drive gating signals of the power stage. But in this invention, with the aid of additional circuitry power stage could be prevented from damaging.
  • there is no invention that performs all control actions via a microprocessor is stable and robust, and has a competitively low cost as other systems.
  • the main objects of the present invention are to provide an induction heating cooker that operates at unity power factor, causes no audible noise during operation, can continuously detect to the load variations and can operate in a wide power range, can control the temperature of the cookware, and protect itself against hazardous conditions, such as over-current situations and false gate signals.
  • the induction cooking apparatus in this invention comprises of a power stage, which is a quasi-resonant inverter circuit with a single transistor (Insulated Gate Bipolar Transistor, IGBT).
  • IGBT Insulated Gate Bipolar Transistor
  • the transistor is turned on and off continuously.
  • a high frequency current is generated in the heating coil and the resonant capacitor.
  • the current in the heating coil generates a high frequency magnetic flux that causes an electromagnetic induction action that generates eddy currents in a removable or non-removable cookware, which is placed on the cooktop and made of a magnetic material such as steel, iron, etc.
  • a removable or non-removable cookware which is placed on the cooktop and made of a magnetic material such as steel, iron, etc.
  • the induction cooktop system is fed from a source of AC voltage.
  • a rectifier is connected between the AC voltage source and power stage of induction cooktop for generating series of rectified AC half cycles.
  • the heating coil is connected between the output of the rectifier and the semiconductor switch (IGBT).
  • the resonant capacitor is connected parallel to the heating coil and an anti-parallel diode is connected parallel to IGBT.
  • FIG-1 shows the block diagram representation of the induction cooking system.
  • "Power Stage” (10) block is where the energy transfer from the system to the cookware (20) occurs and high frequency current and magnetic field are generated.
  • the Insulated Gate Bipolar Transistor (IGBT) employed in this block is driven by the gate pulses sent by the "gate drive” (11) block.
  • IGBT Insulated Gate Bipolar Transistor
  • “Gate drive” (11) receives signals from “turn-on duration controller” (12) and “turn-off duration controller” (13) blocks.
  • "Turn-on duration controller” (12) determines the turn-on duration of gate pulses according to the power level required by the "power controller” block (14). Turn-on durations of gate signals of each power level are defined and different from each other. The level that the inductor (19) current rise in that duration is also defined, therefore the inductor current level (620) is also monitored.
  • “Turn-off duration controller” (13) block determines the turn-off durations of gate pulses (540). Turn-off durations do not vary with the power level, but they are sensitive to load variations.
  • turn-off durations are defined by the zero-crosses of the inductor or heating coil (19) current.
  • So "Zero-Cross Detector” (22) circuit employed in “Protection Circuits” (15) block detects the zero-cross instants of the inductor (19) current and sends a signal to turn-off duration controller (13) at this instant.
  • the inductor (19) current is measured and transformed into a low-level voltage signal by "current transformer” (16) block.
  • Power controller (14) gets the user inputs, such as desired power level or pan temperature; and defines gate pulse (540) turn-on durations accordingly. It also monitors the inductor current peak level (610) and pan (20) temperature to control power level and pan (20) temperature. Furthermore, it monitors the warning signal outputs (570A, 570B, 590) and stops the operation in such a case.
  • “Protection circuits” (15) block is designed to protect the system against over-current conditions and erroneous gate signals (520). This block continuously monitors the collector-emitter voltage, V CE , of IGBT and the inductor current level (620); and makes power control block (14) terminate the operation of the system, when a hazardous condition occurs.
  • Pan detection circuit (17) observes the DC link voltage (500) of the power stage (10) and makes power controller block (14) stop the operation, if it detects an improper cookware.
  • Figure-2 shows the same functional block diagram as Figure-1, when a microprocessor (18) is employed in the system for user interface, power level and pan (20) temperature controlling, and observation of hazardous conditions.
  • a microprocessor (18) is employed in the system for user interface, power level and pan (20) temperature controlling, and observation of hazardous conditions.
  • Power stage (10) circuit generates a high frequency (around 20-25 KHz) electromagnetic field for heating magnetic cookware (20).
  • Figure-3 shows the detailed circuit diagram of the power stage (10).
  • the power circuit is connected to the mains through a "full-wave rectifier” (24), D1, D2, D3, and D4.
  • the output (500) of the full wave rectifier (24) is fed to the power stage (10) through a high-frequency bypass capacitor, C1.
  • the voltage across C1, V CI or V DC is also called DC link voltage (500).
  • C1 is not big enough to make V DC a smooth DC signal; so V DC is the plurality of rectified powerline half cycles. Since the switching frequency (about 20 kHz) of the IGBT is much higher than the mains frequency (50 Hz), DC link voltage (500), V DC , could be assumed to be constant during a switching period (about 50 ⁇ sec).
  • the transistor is turned on and off in response to pulse signals (520) from the driving circuit to put a heating coil (19), L, and a capacitor parallel to it, C RES , into a resonant state. Accordingly, the heating coil (19) generates a magnetic flux, which causes an electromagnetic induction action to generate an eddy current in a magnetic cookware (20).
  • a short circuit current, I Cres passes through the resonant capacitor and IGBT for a very short duration (a few microseconds).
  • the current, I L flows through the heating coil (19) and IGBT. The sum of these two currents is the IGBT current and drawn in Figure-4a.
  • the level of I Cres is dependent to the level of collector emitter voltage of IGBT (510), V CE , at the turn-on switching instant.
  • V CE collector emitter voltage of IGBT (510), V CE , at the turn-on switching instant.
  • the waveform of V CE (510) is drawn in Figure-4b. As it can be seen the transistor is turned on at the instant where the collector voltage is not zero. So the voltage across the resonant capacitor is forced to a change equal to value of V CE (510) at the turn-on instant.
  • ⁇ t fi is defined as the duration that V CE (510) falls to zero, namely turn-on switching time.
  • ⁇ V Cres is the change of the voltage across C RES .
  • the digital device (18) is responsible for starting and stopping the operation of the power stage (10).
  • the microprocessor (18) starts the power stage (10) when the system is energized and a user input is received.
  • the microprocessor (18) stops the operation when the temperature of the cookware (20) reaches to a value predetermined by the user. Also it disables the operation of the inverter when a non-suitable cookware is detected and restarts the system after a while.
  • an alarm signal (570A, 570B, 590) is received from the analog peripheral circuits (15, 17)
  • the microprocessor (18) processes this signal and disables the gating signals (540) for a determined duration, then restarts when the silence period is over.
  • the digital device (18) adjusts the power level by adjusting the turn-on durations of gate pulses (540); no intermittent operation is required to adjust the power level.
  • the cooktop begins to heat at the minimum power, which means the shortest turn-on gating signals, and then the power is increased till the power level desired by the user is reached.
  • the power is monitored by monitoring the peak value of the inductor current (610); this value is directly related to the output power.
  • Routine 1 the microprocessor (18) reads the variables MODE and LEVEL (111), defined by the user via the user panel not necessarily shown in the figure.
  • MODE could be TEMP or POWER (112). If it is TEMP that means the induction cooktop will operate as a temperature controlled system (114). So it will operate at maximum power, defined as Max_Power, until the temperature reaches to the value desired by the user, defined as Final_Temp, which is equal to the variable LEVEL. If the MODE is POWER (113), that means the cooktop will operate at the power desired by the user, which is equal to LEVEL variable. Also the operation will stop as a safety precaution, if the temperature reaches the maximum permissible value, defined as Max_Temp. Max_Temp and Max_Power are the constant system parameters and cannot be modified by the user.
  • the current power level, Power_Level which the cooktop operates at, is set to minimum power level of the system, Min_Power (120).
  • the turn-on durations are predetermined values that change with the current power level accordingly.
  • Each power level has its own predefined turn-on durations (120).
  • Min_Power is a constant system parameter and cannot be modified by the user.
  • Turn-off durations are dependent on the resonant frequency of the power stage (10), namely the load variations; so it should be updated dynamically.
  • a single gate pulse (540) is produced (130).
  • "Gate” is a built-in function of the microprocessor's PWM (Pulse Width Modulation) output.
  • the first argument of "Gate” function is the turn-on duration of the gate signal (520), and the second argument is the turn-off duration.
  • predefined turn-on duration is sent as the first argument and a sufficiently long duration of 1 second (this value is not obligatory, just a preference) is entered as turn-off duration (130), so that only one pulse will be produced at the gate output (520) of the microprocessor(18).
  • gate signals could be started using function "Gate" (150).
  • the user inputs are checked if the user has made any updates and in every 100 milliseconds (this value is not obligatory, just a preference) the inductor current peak level (610) is checked; Power_Level is updated so that Final_Power_Level could be reached; and finally the temperature of the cookware (20) is checked.
  • Two timers, timer1 and timer2, are used to count these durations. These timers are initiated just after the gate pulses (540) are started (160,170).
  • the turn-off duration is updated using Routine 2 (140), as described above. This action is repeated in a loop every 10 milliseconds (this value is not obligatory, just a preference).
  • the current power level, Power_Level is compared with Final_Power_Level, which is the power level the user desired (190). If Power_Level is greater than Final_Power_Level, then Power_Level is decremented (210). If they are equal, no update is made (220); otherwise Power_Level is incremented (230).
  • the temperature of the cookware (20) is received from the analog peripheral circuit (21) and saved to the variable TEMP. TEMP is compared with the value, Final_Temp, which the user desired (240). If the temperature of the cookware (20) reaches the desired value, the operation of the system is halted for 10 seconds (this value is not obligatory, just a preference) and the overall procedure restarts from the beginning (250). Otherwise the software continues its operation (260).
  • the shortest loop is terminated at the instant of the peak of the DC link signal (500); this instant occurs 5 milliseconds after the 50 Hz zero-cross detector (23) output (580) becomes HIGH (if the line frequency is assumed to be 50 Hz). If this output (580) is not HIGH, the outputs (570A, 570B) of Protection Circuits (15) and the output (590) of Pan Detection Circuit (17) is checked (280). If any of them (570A, 570B, 590) is HIGH, that means an improper cookware has been placed on the cooktop or a hazardous condition has occurred, hence the gating signals (540) are interrupted for 3 seconds (200). After the completion of 3 seconds period, the overall procedure is restarted (100). If they (570A, 570B, 590) are not HIGH, then 50 Hz zero cross detector (23) output (580) is checked again in a loop manner (260).
  • the microprocessor (18) When 50 Hz zero-cross detector (23) output (580) becomes HIGH, the microprocessor (18) resets "timer3" and starts to count 5 milliseconds (270). Counting this duration, it (18) also checks the outputs (570A, 570B) of Protection Circuits (15) and the output (590) of Pan Detection Circuit (17). If any of them (570A, 570B, 590) is HIGH (320), the gating signals (540) are interrupted for 3 seconds (200). Otherwise timer3 is checked if the duration of 5 milliseconds is completed (330). If it is not completed hazard warning signals (570A, 570B, 590) are checked in a loop manner (320). Else the turn-off duration of gate pulses (540) is updated by using Routine 2 (140), and the turn-off durations of the gate signals are updated accordingly (290).
  • timers are checked if the durations of the loops are over (300, 310). If the duration of 100 milliseconds is over (310) then timer2 is reset (170), and the procedure that are described above is repeated. If 1-second duration is over (300), using Routine I (110) user inputs are checked for the updates and then timer1 is reset (160) and the loop is repeated.
  • FIG. 6 Current transformer block (16) transforms the inductor (19) current to a voltage value, which is defined as inductor current level (620).
  • Figure-8 shows the internal diagram of the current transformer block (16).
  • the primary side of the transformer is the heating coil (19), and secondary side is where the transformed voltage occurs on resistor, R10.
  • I L is the current flowing through heating coil (19).
  • the peak value of V OUT hence the inductor current peak value (610) is stored and sent to the microprocessor (18).
  • Protection circuits (15) and pan detection circuit (17) are designed to prevent the power circuit (10) against unexpected hazardous conditions, such as malfunctioning of the microprocessor (18).
  • the analog protection circuit monitors the inductor current level (620) and the collector voltage (510) of the semiconductor switch. When the inductor current level (620) exceeds the maximum permissible value (V ref,current ), the output of COMP1 becomes HIGH. This output turns on the bipolar transistor, T3, (530); hence latches the output of the gate signal (520) to low state so that the power inverter (10) is disabled. Therefore power circuit (10) and IGBT are protected against overcurrents. It also sends an alarm signal (570A) to the microprocessor (18) to make it disable the gate outputs (540) of the digital circuitry (18).
  • V CE (510)
  • V CE (510)
  • C RES resonant capacitor
  • the turn-off duration is constant during an AC half-cycle, and directly related to the resonance frequency of the power inverter (10). But due to load variations the resonance frequency may vary.
  • the inductor (19) current is monitored by the current transformer (16), which is used also for over-current protection.
  • the minimum V CE voltage (510) occurs at the zero cross of the inductor (19) current.
  • Figure-11a and 11b show the typical waveforms of inductor (19) current and V CE (510), respectively. So by observing the inductor current level (620) the turn-off durations with yielding minimum power loss could be achieved.
  • the monitored inductor current level (620) is inverted by an inverting amplifier (22) and fed to the microprocessor as the output (560) of Zero Cross Detector.
  • the microprocessor (18) updates the duration of turn-off signals every 10 milliseconds (290) by monitoring this signal. It (18) calculates the time elapsed between the turn-off instant of the gate signals (140) and the falling edge of the Zero-Cross Detector (22) output (560).
  • Figure-11d shows the Zero-Cross Detector (22) output (560).
  • the system further includes a circuit, called Pan Detection Circuit (17), for detecting if a suitable cookware (20) is placed on the cooktop.
  • This circuit (17) monitors the DC link voltage signal (500). According to the monitored signal Pan Detection circuit (17) decides whether there is a suitable cookware (20) on the cooktop or not. If there is no suitable cookware present, this circuit (17) sends an alarm signal (590) to microprocessor (18) to make it disable the operation of the power inverter (10) for a predetermined duration.
  • This output (580) is also fed to the microprocessor (18) G to detect the peak instant of DC link voltage.
  • DC link voltage (500) is monitored with a resistor divider by the inverting input of the comparator COMP3 in Figure-12.
  • the level of the non- inverting input, namely the reference value, is a small fraction of the peak value of the DC link voltage (500). In this way when DC link voltage (500) falls below a certain value the output of the comparator (580) will go to HIGH state as seen in Figure-13b.
  • 50 Hz Zero Cross Detector (23) circuit will produce no HIGH signal output when there is no suitable pan.
  • the Pan Detection Circuit (17) observes these outputs and if no HIGH signal output (580) is produced by 50 Hz Zero Cross Detector (23) for a duration of 400 milliseconds, it sends a disable signal (590) to microprocessor (18) to stop the operation of the Power Stage (10). 3 seconds after the disabling the operation, it (17) restarts the system to detect if the user put a suitable pan (20) on the cooktop. Then it observes the output (580) of 50 Hz Zero Cross Detector (23) during 400 milliseconds and disables the system or remains idle according to level of this signal, that is the presence of a cookware (20).
  • the output (580) of 50 Hz Zero Cross Detector (23) feeds the input of NAND-A in Figure-13.
  • the output of NAND-A charges the capacitor C23 and if its input is LOW, that means no zero crosses occur.
  • the time elapsed to charge C23 to a value that sets the output of NAND-B to LOW state is approximately 400 milliseconds. If no zero cross occurs, then C23 is charged to the threshold value, output of NAND-B goes to LOW, and output (590) of NAND-C goes to HIGH, which is connected to the microprocessor (18).
  • FIG-15 shows the circuit diagram of the Temperature to Voltage Converter Block (21).
  • a Negative Temperature Coefficient (NTC) thermistor is placed below the top plate of the cooktop and it senses the temperature of the cookware (20).
  • the NTC thermistor and R11 forms a resistor divider, and the voltage of node (600) changes as the temperature changes.
  • the microprocessor could acquire the temperature of the cookware (20).
  • the invention contains a gate drive (11) with single totem-pole output designed for direct drive of IGBTs. This block is necessary because the gate pulses (540) of the microprocessor (18) are between 0 and 5V, but IGBT require between 0 and 15V for better performance.
  • a turn-on gate signal (540) arrives from the microprocessor (18)
  • the lower transistor T1 will be turned off, and the upper transistor T2 will be turned on. Therefore 15 Volt signal will arrive to the gate of IGBT, through node (520) and upper transistor, T2.
  • a turn-off gate signal (540) arrives from the micro-processor (18)
  • the lower transistor T1 will be turned on, and the upper transistor T2 will be turned off.
  • the gate of IGBT will be grounded through node (520) and lower transistor, T1.
  • the output of the gate drive could be grounded by the protection circuits (15) regardless of the gate signal received from the microprocessor (18). This prevents false gate signals (540) caused by malfunctioning of the micro-processor destruct the power transistor.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Surgical Instruments (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Dry Shavers And Clippers (AREA)

Claims (7)

  1. Ein Induktionskocher, der enthält:
    eine Stromkreis zu Energieinverter (10), der im Wesentlichen einen Einheitsenergiefaktorstrom von den Hauptleitungen nimmt, eine Induktionsspule (19), die einen hochfrequenzmagnetischen Bereich erzeugt, welche zur Induktion eines entfernbaren oder nichtentfernbaren magnetischen Kochgeschirrs (20) führt, ein Resonanzkondensator parallel zu besagter Induktionsspule (19), ein IGBT als Schaltungselement, und eine Energiediode (Dp), die in einer antiparallelen Weise zu besagtem IGBT gesetzt ist;
    einen Mikroprozessor (18) zur Einnahme der gewünschten Temperatur des Kochgeschirrs oder des gewünschten Machtniveaus des Kochapparats von einem Bedienungsfeld, welcher die Machtübertragung dem gesagten Kochgeschirr (20) kontrolliert, die angemachte Dauer von Eingangspulsen (520, 540) reguliert, die Temperatur des gesagten Kochgeschirrs (20) kontrolliert, wenn die Temperatur des gesagten Kochgeschirrs (20) den Sollwert erreicht hat, die Operation des Systems unterbricht oder das System nach dem Warten für eine bestimmte Dauer wieder laufen lässt , sobald es gewesen ist, die Anpassung der Umdrehung von Dauern des Tors pulsiert, nullböse Momente der gegenwärtigen fließenden Heizungsrolle über nullböse Entdeckungsmittel (22) und das Unterbrechen der Operation der Betriebsphase (10) für eine bestimmte Dauer beobachtet, wenn ein Vorsignal (570A, 570B, 590) vom Pan - Entdeckungsstromkreis (17) oder Schutzstromkreis (15) erhalten wird;
    eine Pan - Entdeckungsstromkreis (17), die ermittelt, ob ein passendes Kochgeschirr (20) auf das Kochfeld gelegt wird, DC Gleichstrom-Verbindungsstromspannung (500) steuert und ein Mittel zum nullbösen 50-Hz-Entdecker (23) umfasst, um Nullkreuze der Signale von der AC-Eingangsstromspannung (Vac) zu entdecken;
    Ein Block des analogen Schutzkreises (15), der den Energieinverter (10) gegen Überströme schützt, indem er durch die gegenwärtige Induktionsspule (19) fließt und sowie gegen die ungeeigneten Eingangssignale, indem er gleichzeitig die Kollektorspannung von IGBT (510) und Eingangsignale (540) beobachtet.
  2. Ein Induktionskochapparat nach Anspruchs 1, wobei vorerwähnter Mikroprozessor (18):
    erwirbt in der Betriebsphase den Energieeingang von der Benutzertafel, teilt die gewünschte Temperatur des Kochgeschirrs (20) zum vorher eingestellten Wert der maximalen erlaubten Temperatur des Kochgeschirrs (20) zu, und bedient die Energieinverter (10) beim gewählten Energieeingang;
    in der Temperaturweise, erwirbt den Temperatureingang von der Benutzertafel, bedient die Energieinverter (10) am maximalen Energieniveau, wenn die Temperatur des gesagten Kochgeschirrs (20) den Sollwert erreicht hat, die Operation des Systems unterbricht oder das System nach dem Warten für eine bestimmte Dauer wieder laufen lässt.
  3. Ein Induktionskochapparat nach Anspruchs 1, wobei vorerwähnter Mikroprozessor (18):
    um die Energieinverter (10) mit dem minimalen Energieniveau des Kochgeräts zu treiben, vergleicht das gegenwärtige Energieniveau mit dem Energieniveau, das der Benutzer über das Bedienungsfeld für Zunahme oder Verminderung als gegenwärtiges Energieniveau bestimmt hat, um beide Niveaus gleichzumachen; erzeugt Tor-Pulse (540), die Dauer des Energieniveaus entsprechend in diesem Moment anmachen; vergleicht das Maximalniveau des Induktionsstroms (610) mit dem erwarteten Wert und unterbricht das System in 3 Sekunden, wenn es nicht in ±20 Band des erwarteten Werts ist.
  4. Ein Induktionskochapparat nach Anspruchs 1, wobei vorerwähnter Mikroprozessor (18):
    Beobachtet den ersten nullbösen 50-Hz-Entdecker (23) Produktion (580) und wartet auf 5 Millisekunden, wenn die Produktion (580) HOCH wird;
    rechnet die Zeit zwischen der Umdrehung von der Schaltung des Moments des gegenwärtigen Tor-Pulses (540) und dem sofortigen nullbösen Entdecker (22), wobei dessen Ausgang (560) sein Zustand von HOCH bis NIEDRIG ändert; verwendet diese berechnete Zeit als Umdrehung von der Dauer der Eingangssignalen (540) bis zur folgenden Berechnung.
  5. Ein Induktionskochapparat nach Anspruchs 1, wobei vorerwähnter Mikroprozessor (18):
    beobachtet die Produktion (590) des Pan - Entdeckungsstromkreises (17) und Produktion (570A, 570B) des Schutzstromkreis-Blocks (15);
    hält Eingangssignale (540) nach 3 Sekunden und schaltet das System wieder nach der Vollziehung dieser Dauer, wenn einige dieser Produktionen (570A, 570B, 590) HOCH ist.
  6. Ein Induktionskochapparat nach Anspruchs 1, vorerwähnter Pan-Entdeckungsstromkreis (17):
    Umfasst nullbösen 50-Hz-Entdecker (23) Mittel, die Gleichstrom-Verbindungsstromspannung (500) mit einem Bezugswert über COMP3 vergleichen und HOHE Produktion (580) erzeugen, wenn Gleichstrom-Verbindungsstromspannung (500) unter dieser Verweisung, NIEDRIGE Produktion (580) sonst ist;
    beobachtet das Gegenteil dieser Produktion (580) durch NAND-A;
    belädt den Kondensator (C23) mit der Produktion von NAND-A durch R56 (mit einer von R56*C23 unveränderlichen Zeit), wenn Produktion (580) des nullbösen 50-Hz-Entdeckers (23), Entladungen es durch (R55 // R56) sonst (mit einer Zeit unveränderlich (R55 // R56) *C23) NIEDRIG ist;
    sendet HOHES Signal an den Mikroprozessor (18), wenn C23 zu einem Wert über der Eingangsschwelle von NAND-B NIEDRIG sonst beladen wird;
    belädt den Kondensator (C22) mit der Produktion von NAND-C durch R59 und R52 (mit einer Zeit unveränderlich (von R52+R59) *C22), wenn Produktion (590) des Pan - Entdeckungsstromkreises (17), Entladungen es durch R59 sonst (mit einer von R59*C22 unveränderlichen Zeit) HOCH ist;
    Entladungs C23 durch R58 durch Sätze die Produktion von COMP4 zu NIEDRIG, wenn C22 über einem vorher bestimmten Bezugswert in einer Dauer bestimmt durch die Zeit unveränderlich ((R52+R59) *C22), keine Entladungen sonst beladen wird;
    fasst die Produktion von NAND-C neu, um NIEDRIG festzusetzen, wenn C23 unter der Eingangsschwelle von NAND-B entladen wird.
  7. Ein Induktionskochapparat nach Anspruchs 1, worüber die vorerwähnte Schutzstromkreis (15) umkreist:
    Umfasst Mittel zum nullbösen Entdecker (22), die das Induktor- Strom-Niveau (620) erhalten vom gegenwärtigen Transformator-Block (16) umkehren und an den Mikroprozessor (18) als die Produktion (560) senden; umfasst einen Komparator (COMP1) das Vergleichen des gesagten Induktor- Strom-Niveaus (620) mit einem Bezugswert (Vref,Strom), der dem maximalen erlaubten gegenwärtigen Wert entspricht, sendet HOHES Signal (570A) an den Mikroprozessor (18), wenn gesagtes Induktor- Strom-Niveau (620) über Vref,Strom, gegenwärtiges, NIEDRIGES Signal (570A) sonst ist;
    macht BJT (T3) an und setzt Eingangsignale (520) auf NIEDRIG durch den Knoten 530, wenn die Produktion von COMP1, kein Eingreifen zu Tor-Pulsen sonst HOCH ist;
    umfasst einen Komparator (COMP2) das Vergleichen der Kollektorspannung von IGBT (510) mit einem Bezugswert, der maximalem erlaubtem Kollektorspannungswert (510) entspricht, bevor sich von IGBT drehen, das Produzieren HOHER Produktion, wenn Kollektorspannung (510) über der Verweisung NIEDRIG sonst ist;
    sendet HOHES Signal (570B) an den Mikroprozessor (18), wenn die Produktion von COMP2 HOCH ist und Tor-Produktion (540) zur gleichen Zeit NIEDRIG sonst HOCH ist;
    macht BJT (T3) an und Eingangssignale (520) zu NIEDRIG durch den Knoten 530 untergehend, wenn die Produktion des COMP-2, kein Eingreifen zu Tor-Pulsen sonst HOCH ist.
EP03728210A 2003-05-28 2003-05-28 Induktionskochfeld Expired - Lifetime EP1629698B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2003/000047 WO2004107819A1 (en) 2003-05-28 2003-05-28 Induction cooktop

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EP1629698A1 EP1629698A1 (de) 2006-03-01
EP1629698B1 true EP1629698B1 (de) 2006-12-27

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AT (1) ATE349880T1 (de)
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DE (1) DE60310774T2 (de)
ES (1) ES2279950T3 (de)
WO (1) WO2004107819A1 (de)

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WO2016010493A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ Induction heating cooker enabling improved power setting control
WO2016010491A1 (en) 2014-07-15 2016-01-21 Arcelik Anonim Şirketi System and method enabling modification of cookware positioning in an induction heating cooker
WO2016010492A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ System and method for improving noise performance of multi-zone quasi-resonant inverter induction heater
WO2016010490A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ System and method for the operation of an induction heating cooker
US10605464B2 (en) 2012-10-15 2020-03-31 Whirlpool Corporation Induction cooktop
US10893579B2 (en) 2017-07-18 2021-01-12 Whirlpool Corporation Method for operating an induction cooking hob and cooking hob using such method
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
US11064573B2 (en) 2017-07-24 2021-07-13 Haier Us Appliance Solutions, Inc. Determining resonant frequency for quasi-resonant induction cooking devices
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices
US11212880B2 (en) 2012-10-15 2021-12-28 Whirlpool Emea S.P.A. Induction cooking top
US11678410B2 (en) 2019-07-24 2023-06-13 Haier Us Appliance Solutions, Inc. Determining presence of compatible cookware in induction heating systems
US11877371B2 (en) 2020-07-03 2024-01-16 Peaceworld. Co., Ltd Induction range having automatic double side roasting function

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CN107027207B (zh) * 2017-05-25 2023-07-18 浙江绍兴苏泊尔生活电器有限公司 Igbt保护电路和电磁炉
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KR102200066B1 (ko) 2019-09-18 2021-01-07 이명옥 인덕션 가열 조리장치
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US11212880B2 (en) 2012-10-15 2021-12-28 Whirlpool Emea S.P.A. Induction cooking top
WO2016010490A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ System and method for the operation of an induction heating cooker
WO2016010493A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ Induction heating cooker enabling improved power setting control
WO2016010492A1 (en) 2014-07-15 2016-01-21 Arçeli̇k Anoni̇m Şi̇rketi̇ System and method for improving noise performance of multi-zone quasi-resonant inverter induction heater
WO2016010491A1 (en) 2014-07-15 2016-01-21 Arcelik Anonim Şirketi System and method enabling modification of cookware positioning in an induction heating cooker
US10893579B2 (en) 2017-07-18 2021-01-12 Whirlpool Corporation Method for operating an induction cooking hob and cooking hob using such method
US11064573B2 (en) 2017-07-24 2021-07-13 Haier Us Appliance Solutions, Inc. Determining resonant frequency for quasi-resonant induction cooking devices
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices
US11678410B2 (en) 2019-07-24 2023-06-13 Haier Us Appliance Solutions, Inc. Determining presence of compatible cookware in induction heating systems
US11877371B2 (en) 2020-07-03 2024-01-16 Peaceworld. Co., Ltd Induction range having automatic double side roasting function

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AU2003232875A1 (en) 2005-01-21
ATE349880T1 (de) 2007-01-15
EP1629698A1 (de) 2006-03-01
WO2004107819A1 (en) 2004-12-09
DE60310774T2 (de) 2007-07-12
DE60310774D1 (de) 2007-02-08
ES2279950T3 (es) 2007-09-01

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