EP4366467A1 - Procédé de verrouillage électrique et cuiseur à induction - Google Patents

Procédé de verrouillage électrique et cuiseur à induction Download PDF

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Publication number
EP4366467A1
EP4366467A1 EP23207314.8A EP23207314A EP4366467A1 EP 4366467 A1 EP4366467 A1 EP 4366467A1 EP 23207314 A EP23207314 A EP 23207314A EP 4366467 A1 EP4366467 A1 EP 4366467A1
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EP
European Patent Office
Prior art keywords
induction cooker
power
drive circuit
preset
total power
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.)
Pending
Application number
EP23207314.8A
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German (de)
English (en)
Inventor
Zuotian KANG
Jinhua Chen
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.)
Guangdong Arcair Appliance Co Ltd
Original Assignee
Guangdong Arcair Appliance Co Ltd
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 Guangdong Arcair Appliance Co Ltd filed Critical Guangdong Arcair Appliance Co Ltd
Publication of EP4366467A1 publication Critical patent/EP4366467A1/fr
Pending 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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the embodiments of the present disclosure relates to but not limited to kitchen appliances and in particular to a power interlocking method and an induction cooker.
  • the induction cookers mainly use single-transistor parallel resonance technology without limiting a heating power of a heating zone, which leads to generation of a step voltage at the levels between a minimum continuous power and a maximum power.
  • the step voltage may increase along with increase of a grid voltage, which leads to high temperature of an Insulate-Gate Bipolar Transistor (IGBT) drive circuit.
  • IGBT Insulate-Gate Bipolar Transistor
  • the induction cooker may enter an IGBT high-temperature protection mode and even the IGBT drive circuit is burned out, affecting the experiences of the users.
  • An embodiment of the present disclosure provides a power interlocking method and an induction cooker.
  • a power interlocking method which is applied to an induction cooker with multiple heating zones.
  • the power interlocking method includes:
  • the induction cooker is provided with a display device; and the power interlocking method further includes: when the induction cooker is powered on for the first time, displaying the maximum total power by the display device.
  • the power interlocking method further includes: when the maximum total power is zero, controlling all of the heating zones to be in an off state.
  • the power interlocking method further includes:
  • the induction cooker is provided with an Insulate-Gate Bipolar Transistor (IGBT) drive circuit; the power interlocking method further includes:
  • an induction cooker which is provided with multiple heating zones and a controller; the controller includes an obtaining module and an adjusting module;
  • the induction cooker is provided with a display device; the display device is connected with the controller and the display device is configured to, when the induction cooker is powered on for the first time, display the maximum total power.
  • the controller is further configured to, when the maximum total power is zero, control all of the heating zones to be in an off state.
  • the adjusting module is further configured to. when a working voltage of the induction cooker is a first voltage value, control a first total power value of the induction cooker to be less than or equal to the maximum total power, and when the working voltage of the induction cooker is a second voltage value, control a second total power value of the induction cooker to be less than or equal to the first total power value of the induction cooker; wherein the second voltage value is greater than the first voltage value, the first total power value is a sum of the current powers of all heating zones at a target level in a case that the working voltage of the induction cooker is the first voltage value, and the second total power value is a sum of the current powers of all heating zones at the target level in a case that the working voltage of the induction cooker is the second voltage value.
  • the induction cooker is provided with an Insulate-Gate Bipolar Transistor (IGBT) drive circuit;
  • the controller further comprises an IGBT drive circuit regulating module which is connected with the IGBT drive circuit;
  • the IGBT drive circuit regulating module is configured to obtain a temperature of the IGBT drive circuit; when the temperature of the IGBT drive circuit is greater than a preset first temperature threshold, or the temperature of the IGBT drive circuit is greater than a preset second temperature threshold and a temperature increase rate of the IGBT drive circuit is greater than a preset temperature increase rate threshold, increase a power of the induction cooker; when the temperature of the IGBT drive circuit is greater than a preset third temperature threshold, turn off the IGBT drive circuit, and output fault codes corresponding to the IGBT drive circuit; obtain a step voltage value of the IGBT drive circuit within a preset time interval; when the step voltage value is greater than a preset step voltage threshold, increase the power of the induction cooker until the step voltage
  • IGBT Insulate-
  • the above technical solutions at least have the following beneficial effects: limitation is made to the power of the heating zones of the induction cooker and the current powers of the heating zones in working state are adjusted such that the current power of the heating zones in working state is less than or equal to the preset maximum power of the heating zones, and the sum of the current powers of the multiple heating zones in working state is less than or equal to the preset maximum total power of the multiple heating zones.
  • the induction cooker can perform stable and continuous heating and will not enter the IGBT high-temperature protection mode at a high voltage, improving the experiences of the users.
  • an induction cooker there is provided an induction cooker.
  • the induction cooker includes multiple heating zones and a controller 10.
  • the induction cooker is provided with a display device which specifically is a touch display screen.
  • an Insulate-Gate Bipolar Transistor (IGBT) drive circuit 30 30, a coil disk L, a resonant capacitor C1, a resonant capacitor C2, and a relay 20 are disposed in the heating zones of the induction cooker. Both ends of the coil disk L are respectively connected to both ends of the resonant capacitor C1, and the other end of the resonant capacitor C1 is connected to one port of the controller 10.
  • the resonant capacitor C2 is series-connected with the relay 20 and then parallel-connected with the resonant capacitor C1.
  • the IGBT drive circuit 30 is provided with an IGBT transistor, where a gate electrode G of the IGBT transistor is connected to another port of the controller 10, a collector electrode C of the IGBT transistor is connected to one end of the resonant capacitor C2, and an emitter electrode E of the IGBT transistor is connected to another port of the controller 10.
  • the following power interlocking method is applied to the induction cooker.
  • the power interlocking method includes the following steps.
  • step S 110 a preset maximum power of each heating zone is obtained.
  • step S120 a preset maximum total power of multiple heating zones is obtained.
  • a current power of a heating zone in working state is adjusted to enable the current power of the heating zone in working state to be less than or equal to the maximum power and enable a sum of the current powers of the multiple heating zones in working state to be less than or equal to the maximum total power.
  • the maximum power of each heating zone may be set, limited, selected and locked by operating combination buttons on the touch display screen such that the induction cooker can perform stable and continuous heating and will not be enter an IGBT high-temperature protection mode at a high voltage, thereby improving the experiences of the users.
  • the maximum power of a single heating zone can be set in the following manner:
  • any "heating zone” button of the touch display screen is held and then the "timing" button is pressed three times, so as to enable the induction cooker to enter a compensation power debugging state.
  • the induction cooker works with the largest power; at this time, the digital tube displays the compensation power "PX (X range: 0 to 9)", and the maximum power of the heating zone can be adjusted by pressing "0" and “9” buttons and then the "power” button is pressed for saving and the compensation power debugging state is exited.
  • the maximum total power of the multiple heating zones can be set, limited, selected and locked by operating combination buttons on the touch display screen.
  • the maximum total power of the multiple heating zones may be set in the following manner: When the induction cooker is in an off state, the "timing" button on the touch display screen is held and the "child lock” button is pressed three times to enable the induction cooker to enter an interlocking power adjusting state. At this time, the digital tubes of the heating zones 2 and 3 display "interlocking power (e.g. "28” represents interlocking 2800W)", and the dual-digit digital tube flashes "Po".
  • the maximum total power of the heating zones can be adjusted by pressing the "0” and “9” buttons and then the "power” button is pressed for saving.
  • a step voltage of a minimum continuous heating power P5 within the ranges of 220 to 230VAC, 240 to 250VAC and 260 to 285VAC is lower than 100VDC while the temperature of the P5 is not higher than a temperature of the 230VAC maximum heating power P9.
  • a step voltage of the minimum continuous heating power level P5 within the ranges of 220 to 230VAC, 240 to 250VAC and 260 to 285VAC at the time of the relay 20 being disengaged is lower than 100VDC, while the temperature of the level P5 is not higher than the temperature of the 230VAC maximum heating power P9 at the time of the relay 20 being engaged;
  • a step voltage of a continuous heating power level P6 within the ranges of 220 to 230VAC and 240 to 250VAC at the time of the relay 20 being engaged is lower than 100VDC while the temperature of the level P6 is not higher than the temperature T9 of the 230VAC maximum heating power P9 at the time of the relay 20 being engaged; and finally, the power values of levels P5 to P9 within the range of 260 to 285VAC are same and equal to the power value of the level P5.
  • the power values of the levels P6 to P8 are to be set between the power values of the levels P5 to P9; at the high voltage of 260 to 285VAC, the power values of the levels P5 to P9 are same and equal to the power value of the level P5.
  • the high-voltage interlocking power is lower than the normal-voltage interlocking power.
  • the relay 20 For a heating zone with the relay 20 switching the LC single tube of the resonant capacitor, at the normal voltage of 220 to 250VAC, the relay 20 is disengaged at the level P5 and engaged at the levels P6 to P9, and thus, the powers of the P5 to P9 gradually increase; at the high voltage of 260 to 285VAC, the relay 20 is disengaged at the levels of P5 to P9 and the power values of the levels P5 to P9 are same and equal to the power value of the level P5. Thus, the high-voltage interlocking power is lower than the normal-voltage interlocking power.
  • Table 1 Correspondence between levels and powers of the induction cooker at the voltage of 220 to 230VAC Position Setting P1 P2 P3 P4 P5 P6 P7 P8 P9 Upper left heating zone 1500W 1100 1100 1100 1100 1200 1300 1400 1500 Lower left heating zone 2000W 1300 1300 1300 1300 1400 1600 1800 2000 Right heating zone 2600W 1100 1100 1100 1100 1600 1900 2200 2600 Heating ratio (10S) 1S 3S 5S 8S continuous heating
  • a current power of a heating zone in working state is adjusted to enable the current power of the heating zone in working state to be less than or equal to the maximum power and enable a sum of the current powers of the multiple heating zones in working state to be less than or equal to the maximum total power.
  • the power interlocking method further includes the following steps.
  • a first total power value of the induction cooker is controlled to be less than or equal to the maximum total power.
  • a second total power value of the induction cooker is controlled to be less than or equal to the first total power value of the induction cooker.
  • the second voltage value is greater than the first voltage value
  • the first total power value is a sum of the current powers of all heating zones at a target level in a case that the working voltage of the induction cooker is the first voltage value
  • the second total power value is a sum of the current powers of all heating zones at the target level in a case that the working voltage of the induction cooker is the second voltage value.
  • the first voltage value is a normal voltage and the second voltage value is a high voltage.
  • the first voltage value is a voltage of 220 to 230VAC and the second voltage value is a voltage of 260 to 285VAC.
  • the maximum total power is set to 2.8KW
  • the power value of the level P6 of the upper left heating zone is 1200W and the power value of the level P6 of the right heating zone is 1600W
  • the sum of the current powers of the upper left heating zone and the right heating zone is 2800W, which is equal to the maximum total power.
  • the power value of the level P6 of the upper left heating zone is 1200W and the power value of the level P6 of the right heating zone is 1400W
  • the sum of the current powers of the upper left heating zone and the right heating zone is 2600W, which is less than the maximum total power.
  • the maximum total power is set to 3.4KW
  • the power value of the level P9 of the upper left heating zone is 1500W and the power value of the level P7 of the right heating zone is 1900W
  • the sum of the current powers of the upper left heating zone and the right heating zone is 3400W, which is equal to the maximum total power.
  • the power value of the level P9 of the upper left heating zone is 1200W and the power value of the level P7 of the right heating zone is 1400W
  • the sum of the current powers of the upper left heating zone and the right heating zone is 2600W, which is less than the maximum total power.
  • the maximum total power is set to 6.1KW
  • the power value of the level P9 of the upper left heating zone is 1500W and the power value of the level P9 of the lower left heating zone is 2000W and the power value of the level P9 of the right heating zone is 2600W
  • the sum of the current powers of the upper left heating zone, the lower left heating zone and the right heating zone is 6100W, which is equal to the maximum total power.
  • the power value of the level P9 of the upper left heating zone is 1200W and the power value of the level P8 of the lower left heating zone is 1700W, and the power value of the level P7 of the right heating zone is 1400W, the sum of the current powers of the upper left heating zone, the lower left heating zone and the right heating zone is4300W which is less than the maximum total power.
  • the power of the entire machine is not more than the set maximum total power. If the level of heating zones is increased to enable the power of the entire machine to exceed the maximum total power, the buzzer will give a sound prompt and the level increase operation is invalid.
  • the power interlocking method further includes the step S300: when the induction cooker is powered on for the first time, the maximum total power is displayed by the display device. This helps the user to view and make corresponding operation.
  • the induction cooker being powered on for the first time may be the induction cooker being turned on.
  • the buzzer will give one short sound, and the digital tubes and the indicator lamps of the display device all are turned on for about 2 seconds (no response to button press action in the all-on display process), displaying software version number for about one second (the unit digital tube of the heating zones displays "main board version number", the time dual-digit digital tube displays "display board version number", for example, "1,1,1,1,01"), then displaying main board model for about one second ("b, b, b, b, 01") and the interlocking power segment for about one second (the digital tube of the heating zones displays "interlocking power", the dual-digit digital tube displays "Po", for example, "35, Po” representing the interlocking power segment 3500W); the relay 20 is engaged, and then the off state is enabled.
  • the main board model A:2000W/1500Wconfiguration, b:2400W/2000W configuration, C:2600W/3000Wconfiguration, and d:3600W configuration.
  • the power interlocking method may further include the step S400: when the maximum total power is zero, all heating zones are controlled to be in an off state.
  • the maximum total power has several options such as “0000”, “AA00”, “BB00”, “CC00” and “DD00” and the like, where “DD00” is a default maximum power at the time of leaving factory, and "0000”corresponds to the maximum total power set to zero.
  • the power interlocking method further includes the following steps.
  • step S5 a temperature of the IGBT drive circuit 30 is obtained.
  • step S512 when the temperature of the IGBT drive circuit 30 is greater than a preset first temperature threshold, or the temperature of the IGBT drive circuit 30 is greater than a preset second temperature threshold and a temperature increase rate of the IGBT drive circuit 30 is greater than a preset temperature increase rate threshold, a power of the induction cooker is increased.
  • step S513 when the temperature of the IGBT drive circuit 30 is greater than a preset third temperature threshold, the IGBT drive circuit 30 is turned off, and fault codes corresponding to the IGBT drive circuit 30 are output.
  • the third temperature threshold is greater than the first temperature threshold, and the first temperature threshold is greater than the second temperature threshold.
  • the first temperature threshold is 95 degrees Celsius
  • the second temperature threshold is 80 degrees Celsius
  • the third temperature threshold is 105 degrees Celsius
  • the temperature increase rate threshold is 15 degrees Celsius per minute.
  • the power of the induction cooker is increased, for example, the level of the induction cooker is increased from the level P5 to the level P6.
  • the IGBT drive circuit 30 is turned off and the fault codes corresponding to the IGBT drive circuit 30 are output.
  • step S521 a step voltage value of the IGBT drive circuit 30 within a preset time interval is obtained.
  • step S522 when the step voltage value is greater than a preset step voltage threshold, the power of the induction cooker is increased until the step voltage value is within a preset step voltage range.
  • the step voltage threshold is 100VDC and the time interval is 100ms.
  • the step voltage value of the IGBT drive circuit 30 within 100ms of the startup of the induction cooker is detected.
  • the step voltage value is greater than 100VDC, the power of the induction cooker is increased until the step voltage value is within the preset step voltage range.
  • the large-power continuous, stable and reliable heating at the normal voltage of 220 to 250VAC can be achieved and each heating zone uses the corresponding same power for heating at the levels of P5 to P9 at the high voltage of 260 to 285VAC.
  • the large-power interlocking function of 2.8 to 7.2KW of the IGBT soft switch can be maintained for the multiple heating zones within a broad voltage range of 85 to 285VAC.
  • the controller 10 includes an obtaining module and an adjusting module, where the obtaining module is configured to obtain a preset maximum power of each of the heating zones and a preset maximum total power of the multiple heating zones; the adjusting module is configured to adjust a current power of a heating zone in working state to enable the current power of the heating zone in working state to be less than or equal to the maximum power and enable a sum of the current powers of the multiple heating zones in working state to be less than or equal to the maximum total power.
  • the display device is connected with the controller 10 and the display device is configured to, when the induction cooker is powered on for the first time, display the maximum total power.
  • controller is further configured to, when the maximum total power is zero, control all of the heating zones to be in an off state.
  • the adjusting module is further configured to, when a working voltage of the induction cooker is a first voltage value, control a first total power value of the induction cooker to be less than or equal to the maximum total power, and when the working voltage of the induction cooker is a second voltage value, control a second total power value of the induction cooker to be less than or equal to the first total power value of the induction cooker; wherein the second voltage value is greater than the first voltage value, the first total power value is a sum of the current powers of all heating zones at a target level in a case that the working voltage of the induction cooker is the first voltage value, and the second total power value is a sum of the current powers of all heating zones at the target level in a case that the working voltage of the induction cooker is the second voltage value.
  • the controller further includes an IGBT drive circuit 30 regulating module which is connected with the IGBT drive circuit 30; the IGBT drive circuit 30 regulating module is configured to obtain a temperature of the IGBT drive circuit 30; when the temperature of the IGBT drive circuit 30 is greater than a preset first temperature threshold, or the temperature of the IGBT drive circuit 30 is greater than a preset second temperature threshold and a temperature increase rate of the IGBT drive circuit 30 is greater than a preset temperature increase rate threshold, increase a power of the induction cooker; when the temperature of the IGBT drive circuit 30 is greater than a preset third temperature threshold, turn off the IGBT drive circuit 30, and output fault codes corresponding to the IGBT drive circuit 30; obtain a step voltage value of the IGBT drive circuit 30 within a preset time interval; when the step voltage value is greater than a preset step voltage threshold, increase the power of the induction cooker until the step voltage value is within a preset step voltage range; wherein the third temperature threshold is greater than the first temperature threshold, and

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
EP23207314.8A 2022-11-02 2023-11-01 Procédé de verrouillage électrique et cuiseur à induction Pending EP4366467A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211360835.9A CN115720390A (zh) 2022-11-02 2022-11-02 一种功率互锁方法及电磁炉

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EP4366467A1 true EP4366467A1 (fr) 2024-05-08

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355617A2 (fr) * 2010-02-10 2011-08-10 Samsung Electronics Co., Ltd. Appareil de cuisson chauffant par induction
CN107787059A (zh) * 2016-08-24 2018-03-09 珠海格力电器股份有限公司 一种电磁炉高温保护的加热方法及电磁炉
KR101919893B1 (ko) * 2017-04-13 2019-02-08 이효길 인덕션 렌지의 구동 장치 및 방법
EP3582587A1 (fr) * 2018-06-16 2019-12-18 Electrolux Appliances Aktiebolag Procédé de commande de deux zones de cuisson d'une table de cuisson à induction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355617A2 (fr) * 2010-02-10 2011-08-10 Samsung Electronics Co., Ltd. Appareil de cuisson chauffant par induction
CN107787059A (zh) * 2016-08-24 2018-03-09 珠海格力电器股份有限公司 一种电磁炉高温保护的加热方法及电磁炉
KR101919893B1 (ko) * 2017-04-13 2019-02-08 이효길 인덕션 렌지의 구동 장치 및 방법
EP3582587A1 (fr) * 2018-06-16 2019-12-18 Electrolux Appliances Aktiebolag Procédé de commande de deux zones de cuisson d'une table de cuisson à induction

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