[go: up one dir, main page]

WO2013042287A1 - Cuiseur à chauffage à induction - Google Patents

Cuiseur à chauffage à induction Download PDF

Info

Publication number
WO2013042287A1
WO2013042287A1 PCT/JP2012/002446 JP2012002446W WO2013042287A1 WO 2013042287 A1 WO2013042287 A1 WO 2013042287A1 JP 2012002446 W JP2012002446 W JP 2012002446W WO 2013042287 A1 WO2013042287 A1 WO 2013042287A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating coil
load resistance
pan
power
detection means
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.)
Ceased
Application number
PCT/JP2012/002446
Other languages
English (en)
Japanese (ja)
Inventor
野村　智
和裕 亀岡
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.)
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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 Mitsubishi Electric Home Appliance Co Ltd, Mitsubishi Electric Corp filed Critical Mitsubishi Electric Home Appliance Co Ltd
Priority to JP2013534568A priority Critical patent/JP5642289B2/ja
Publication of WO2013042287A1 publication Critical patent/WO2013042287A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction heating cooker including a plurality of heating coils.
  • a placement plate for placing a pan, an induction coil disposed below the placement plate, and a control for energization control of the induction coil An induction heating cooker comprising an apparatus and an operation unit for issuing an energization control command to the control device to the control device, wherein the induction coil includes an inner coil and an outer coil, and the inner coil And the outer coil is individually energized and controlled, and the inner coil and / or the outer coil is determined based on the determination result of the pot bottom determining means that determines the size of the pot bottom using the inner coil and the outer coil.
  • a coil energizing means for controlling energization to the outer coil for example, see Patent Document 1).
  • the present invention has been made to solve the above-described problems, and provides an induction heating cooker that has improved heating unevenness even for large-diameter pans.
  • An induction heating cooker includes a top plate on which a cooking container, which is an object to be heated, is placed, an inner heating coil disposed below the top plate, and an outer periphery of the inner heating coil.
  • An external heating coil provided, an inverter circuit for supplying high-frequency power to the internal heating coil and the external heating coil, power detection means for detecting input power to the inverter circuit or output power from the inverter circuit, and internal heating coil Output current detecting means for detecting the magnitude of the current flowing through the external heating coil, control means for driving and controlling the inverter circuit based on the detection values of the power detection means and the output current detecting means, and the internal heating coil and the external heating coil Load resistance detecting means for detecting each load resistance, and when the load resistance of the external heating coil detected by the load resistance detecting means is equal to or greater than a predetermined value.
  • the inverter circuit is controlled so as to increase the ratio of the current value flowing through the outer heating coil to the current value flowing through the inner heating coil as compared with the case where the load resistance of the outer heating coil is determined to be less than the predetermined value. is there.
  • the control means when the load resistance detecting means detects that the load resistance value of the outer heating coil is equal to or greater than a predetermined value, the control means includes a pan placed above the inner heating coil and the outer heating coil. It is judged that this is a large-diameter pan made of magnetic material that can produce a large heating output with a relatively small heating coil current, and the current value of the inner heating coil (effective) Since the inverter circuit is controlled so as to increase the ratio of the current value (effective value) of the external heating coil to the value), in the large-diameter pan, the temperature drop of the outer periphery relative to the center of the pan bottom is suppressed, and the center of the pan bottom and the outer periphery of the pan bottom A temperature difference can be made small and it can suppress that a pan bottom center part burns or a pan bottom outer peripheral part becomes raw-burning.
  • FIG. 1 It is a figure which shows the circuit structural example of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the heating coil structural example of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the positional relationship of the pan of the induction heating cooking appliance which concerns on Embodiment 1, and a heating coil.
  • FIG. It is a figure which shows the relationship between the inner coil load resistance and the outer coil load resistance of the induction heating cooking appliance which concerns on Embodiment 1, and a pan size.
  • It is a flowchart which shows the heating control process in the control means of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. 1 shows the circuit structural example of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the heating coil structural example of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the positional relationship of the pan of
  • FIG. 1 It is a flowchart which shows the internal heating coil output control process in the control means of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. 2 is a flowchart which shows the external heating coil output control process in the control means of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the example of a relationship between the external coil load resistance value of the induction heating cooking appliance which concerns on Embodiment 1, and an external heating coil electric power distribution coefficient. It is a figure which shows the temperature distribution example of each size pan bottom of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a figure which shows the heating coil structure of the induction heating cooking appliance which concerns on Embodiment 2.
  • FIG. 1 shows the example of a relationship between the external coil load resistance value of the induction heating cooking appliance which concerns on Embodiment 1, and an external heating coil electric power distribution coefficient.
  • FIG. It is a figure which shows the temperature distribution example of each size pan bottom of the in
  • FIG. 2 It is a figure which shows the circuit structural example of the induction heating cooking appliance which concerns on Embodiment 2.
  • FIG. It is a figure which shows the positional relationship of the heating coil of the induction heating cooking appliance which concerns on Embodiment 2, and the pan bottom for every pan size.
  • FIG. It is a figure which shows another example of a circuit structure of the induction heating cooking appliance which concerns on Embodiment 2.
  • FIG. FIG. 1 is a diagram illustrating a circuit configuration example of the induction heating cooker according to Embodiment 1
  • FIG. 2 is a diagram illustrating a configuration example of a heating coil.
  • the induction heating cooker is connected to an AC power source 1, and the power supplied from the AC power source 1 is converted into DC power by DC power supply circuits 2a and 2b and supplied to inverter circuits 8a and 8b.
  • the DC power supply circuits 2a and 2b have the same configuration, and the inverter circuits 8a and 8b have the same configuration.
  • the DC power supply circuits 2a and 2b include rectifier diode bridges 3a and 3b that rectify AC power, reactors 4a and 4b, and smoothing capacitors 5a and 5b.
  • the DC power converted by the DC power supply circuits 2a and 2b is supplied to the inverter circuits 8a and 8b.
  • the input power input to the inverter circuits 8a and 8b is detected by the input current detection means 6a and 6b and the input voltage detection means 7a and 7b.
  • the power detection means of the present invention is constituted by the input current detection means 6a and 6b and the input voltage detection means 7a and 7b in the present embodiment.
  • the inverter circuits 8a and 8b are connected to a high potential side switching element (hereinafter referred to as upper switches 9a and 9b) and a low potential side switching connected in series between the DC buses output from the DC power supply circuits 2a and 2b.
  • Elements hereinafter referred to as lower switches 10a and 10b
  • upper diodes 11a and 11b connected in antiparallel to the upper switches 9a and 9b
  • lower diodes 12a and 12b connected in antiparallel to the lower switches 10a and 10b It consists of and.
  • the upper switches 9a and 9b and the lower switches 10a and 10b are alternately turned on / off by the drive circuits 13a and 13b to generate a high frequency voltage.
  • Load circuits 14a and 14b are connected to output points of the inverter circuits 8a and 8b.
  • the load circuits 14a and 14b are constituted by a series circuit of an inner heating coil 15a and an outer heating coil 15b and resonance capacitors 16a and 16b, and clamp diodes 17a and 17b connected in parallel to the resonance capacitors 16a and 16b.
  • the inner heating coil 15a and the outer heating coil 15b are disposed below the top plate 22 on which a cooking container (such as a pan) that is an object to be heated is placed.
  • the outer heating coil 15b is concentric with the inner heating coil 15a and is disposed outside the outer periphery thereof.
  • the clamp diodes 17a and 17b clamp the connection point potential of the internal heating coil 15a and the external heating coil 15b and the resonance capacitors 16a and 16b to the low potential side bus potential of the DC power supply.
  • the inner heating coil 15a is a heating coil that heats the center of the pan bottom of the pot 23 (small-diameter pan 231, medium-diameter pan 232, large-diameter pan 233, which will be described later), and the outer heating coil 15b is heated. It is a heating coil which heats the pan bottom outer periphery of a thing, and the output current which flows into each heating coil is detected by the output current detection means 18a and 18b.
  • the control means 19 performs the drive control of each inverter circuit 8a, 8b and fulfills the function of controlling the entire induction heating cooker. Based on the heating power instruction set by the user in the operation unit 20, the control means 19 uses the detected values from the input current detection means 6a, 6b and the input voltage detection means 7a, 7b and the external heating coil 15a and the external heating coil 15a. Each power of the heating coil 15b is controlled.
  • the power control of the inner heating coil 15a is controlled by fixing the switching frequency of the upper switch 9a and the lower switch 10a and further adjusting the duty of the upper switch 9a and the lower switch 10a.
  • the power control of the outer heating coil 15b is controlled by fixing the switching frequency of the upper switch 9b and the lower switch 10b and adjusting the duty of the upper switch 9b and the lower switch 10b.
  • a power control method that does not adjust the switching frequency of the inverter circuits 8a and 8b is desirable.
  • the impedance of load circuits 14a and 14b which will be described later, changes with the frequency, the load resistance values of the inner heating coil 15a and the outer heating coil 15b also change, and power distribution becomes complicated. It is.
  • the load resistance detection means 211 provided in the control means 19 includes the electric power of the inner heating coil 15a and the outer heating coil 15b detected by the input current detection means 6a and 6b and the input voltage detection means 7a and 7b.
  • the load resistance value of the inner heating coil 15a and the load resistance value of the outer heating coil 15b are detected from the currents flowing in the inner heating coil 15a and the outer heating coil 15b detected by the output current detection means 18a and 18b, respectively.
  • the heating coil load resistance value is determined by the loss (heat generation) due to the high-frequency current flowing through the heating coil and the induced eddy current generated by the magnetic flux generated by the high-frequency current interlinking the bottom of the pan placed on the heating coil.
  • FIG. 3 shows the positional relationship between the pan and the heating coil of the induction heating cooker according to Embodiment 1
  • FIG. 4 shows the load resistance value of the inner heating coil, the load resistance value of the outer heating coil, and the pan. It is a figure which shows the relationship between the presence or absence and pan size.
  • FIG. 3 shows a case where a small-diameter pan 231 having an outer diameter of about the inner heating coil 15a or less is placed on the top plate 22 above the heating coil, and (b) shows the internal heating on the top plate 22 above the heating coil.
  • the presence / absence of the pan (231, 232, 233) to be heated is determined by determining the input current value of the internal heating coil 15a detected by the input current detection means 6a, the input voltage detection means 7a, and the output current detection means 18a, the input The determination is made based on the internal heating coil resistance value (Rin) detected by the load resistance detecting means 211 using the voltage value and the output current value.
  • Rin internal heating coil resistance value
  • the load resistance value of the internal heating coil 15a becomes small.
  • the threshold value R0 of the internal heating coil load resistance value which is a reference for determining whether heating is possible, is set so that the pan is not heated.
  • the threshold value R0 varies depending on the number of turns of the copper wire of the heating coil, but is set to, for example, about several ⁇ (2 ⁇ to 5 ⁇ ).
  • the discrimination of the pan sizes of the small-diameter pan 231, the medium-diameter pan 232, the large-diameter pan 233, etc. is performed by the input of the external heating coil 15b detected by the input current detection means 6b, the input voltage detection means 7b, and the output current detection means 18b.
  • the current value, the input voltage value, and the output current value are used to make a determination based on the external heating coil load resistance value (Rout) detected by the load resistance detection unit 211.
  • Rout external heating coil load resistance value
  • the high-frequency magnetic flux generated by the high-frequency current flowing through the outer heating coil 15b does not link much with the pan bottom, and a slight induction vortex Since only current flows, power consumption is small, input power is small, and the load resistance value of the external heating coil 15b is also small.
  • the large-diameter pan 233 that covers the entire upper surface of the outer heating coil 15b as shown in FIG. 3C the power consumed by the eddy current at the bottom of the pan increases due to the high-frequency magnetic flux generated by the high-frequency current flowing through the outer heating coil 15b.
  • the skin depth through which eddy current flows becomes shallow, and the load resistance value increases.
  • the outer heating coil load resistance value (Rout) is larger than that when the small diameter pan 231 is placed. This is an intermediate value when the pan 233 is placed.
  • the second threshold value R2 of the external heating coil load resistance value for determining the large diameter pan 233 covering the entire surface above the heating coil 15b, and comparing the external heating coil load resistance value with the threshold values R1 and R2, the small diameter pan 231, large-diameter pan 233, medium-diameter pan 232, and non-magnetic large-diameter pan.
  • the threshold values R0, R1, and R2 vary depending on the number of turns of the coil, but have the following relationship.
  • R1 ⁇ R0 ⁇ R2 For example, the threshold value R1 is about 1.5 ⁇ , and the threshold value R2 is about 5.3 ⁇ .
  • FIG. 5 is a flowchart showing the heating control processing by the control means 19 of the induction heating cooker according to the present embodiment
  • FIG. 8 is a diagram showing the relationship between the external heating coil load resistance value and the external heating coil power distribution coefficient
  • FIG. It is a figure which shows the example of a pot bottom temperature distribution in each pot size.
  • FIG. 5 is a flowchart showing the entire heating control process
  • FIG. 6 is a flowchart showing the output control process of the inner heating coil 15a
  • FIG. 7 is a flowchart showing the output control process of the outer heating coil 15b.
  • the control means 19 determines whether or not there is a heating request such as a heating power setting from the operation unit 20 (step 1), and when there is a heating request, controls the drive circuit 13a to control the inverter.
  • the circuit 8a is driven, a high frequency voltage is applied to the load circuit 14a including the internal heating coil 15a, and the load resistance detection unit 211 detects the values detected by the input current detection unit 6a, the input voltage detection unit 7a, and the output current detection unit 18a.
  • a detection process of the load resistance value of the heating coil 15a is performed (step 2).
  • the obtained load resistance value of the internal heating coil 15a is compared with a predetermined value R0 (step 3).
  • the pot is determined from the relationship between the internal heating coil load resistance value of FIG. 23 is determined not to be placed, the drive of the inverter circuit 8a is stopped (step 4), and the process returns to the heating request waiting from the operation unit 20 (step 1).
  • step 3 If it is determined in step 3 that the load resistance value of the inner heating coil 15a is equal to or greater than the predetermined value R0 and there is a load from the relationship between the inner heating coil load resistance value of FIG.
  • the drive circuit 13b is controlled to drive the inverter circuit 8b, a high frequency voltage is applied to the load circuit 14b including the external heating coil 15b, and the detected values by the input current detecting means 6b, the input voltage detecting means 7b, and the output current detecting means 18b. Then, the load resistance detection means 211 detects the load resistance value of the external heating coil 15b (step 5).
  • the internal heating coil output control process detects the electric power to the internal heating coil 15a from the detection values by the input current detection means 6a and the input voltage detection means 7a (step 8-1). Then, the detected power and the designated power of the thermal power set by the operation unit 20 are compared as the target power (step 8-1). If the detected power is smaller, an output of a drive signal is output to increase the heating power. Increase the level (increase the duty of the upper switch 9a and the lower switch 10a) (step 8-3).
  • step 8-4 If the detected power is larger, decrease the output level of the drive signal to reduce the heating power (upper switch 9a and the lower switch 10a are reduced) (step 8-4), and when the detected power and the target power are substantially equal, the output level of the drive signal is maintained as it is.
  • the distribution of the bottom temperature of the small-diameter pan 231 that is the object to be heated is, for example, as shown in FIG.
  • the load resistance detection unit 211 uses the output current value detected by the output current detection unit 18a and the input power value detected by the input current detection unit 6a and the input voltage detection unit 7a. It is determined whether or not there is no load by detecting the load resistance value (step 9). When it is determined that there is no load, it is determined whether or not the instruction input from the operation unit 20 is heating stop (step 10). If the heating is not stopped, the process returns to step 8 to continue the internal heating coil heating control process. In Step 9, it is determined that there is no load, for example, when the user moves the pan or pan from the heating port during cooking and there is no pan above the inner heating coil 15a.
  • step 10 When it is determined in step 10 that heating is stopped and in step 9 it is determined that there is no load, the process proceeds to step 11 where the drive circuit 13a is controlled to stop outputting the drive signal to the inverter circuit 8a (step 11). ), The process returns to waiting for a heating request from the operation unit 20 (step 1).
  • Step 6 when the load resistance value of the external heating coil 15b is not less than R1 and less than R2, and when it is not less than R2, the external heating coil 15b is respectively determined from the relationship between the external heating coil load resistance value and the pan size in FIG. It is determined that a medium-sized pan 232 or the like whose pan bottom covers a part of the top of the pan is placed, and a large-diameter pan 233 whose pan bottom covers the entire upper portion of the outer heating coil 15b. To do. And when it determines with the medium diameter pan 232 etc. being mounted based on the relationship between the external heating coil load resistance value of FIG.
  • the inner heating coil 15a and the outer heating coil 15b When the inside / outside normal drive mode is set so that the heating density is substantially equal (step 12) and it is determined that the large-diameter pan 233 is placed, it is more than when the medium-diameter pan 232 is placed.
  • an external heating emphasis driving mode is set (step 13).
  • the heating density is (the output of the heating coil) / (the area of the portion facing the pan of the heating coil).
  • the specified heating power (Wall), the inner heating coil load resistance value (Rin), and the outer heating coil load resistance value (Rout) set by the operation unit 20 are used, and the inner heating coil 15a and the outer heating coil 15b are used.
  • A1 is an external heating coil power distribution coefficient at the time of normal heating inside and outside
  • A1 is a pan having a predetermined pan diameter (for example, a pan having an inner heating coil outer diameter greater than or equal to the outer heating coil outer shape and other than a large diameter pan).
  • step 15 an internal heating coil output control process is performed (step 15).
  • This inner heating coil output control process is equivalent to step 8 described above, and is controlled by comparing the inner heating coil target power (Win) set in step 12 or step 13 with the detected power, and the input current detecting means 6a, It is determined whether or not there is no load from the load resistance value of the inner heating coil detected by the load resistance detection means 211 from the detection values of the input voltage detection means 7a and output current detection means 18a (step 16).
  • a coil output control process (step 17) is performed. In step 16, it is determined that there is no load, for example, when the user moves the pan or pan from the heating port during cooking and there is no pan above the inner heating coil 15a.
  • the power to the external heating coil 15b is detected from the values detected by the input current detection means 6b and the input voltage detection means 7b (step 17-1).
  • the detected power is compared with the external heating coil target power (Wout) set in step 12 or 13 (step 17-2). If the detected power is smaller, the drive signal is increased to increase the heating power.
  • the output level is increased (step 17-3), and if the detected power is larger, the output level of the drive signal is decreased to decrease the heating power (step 17-4).
  • the detected power and the target power are substantially equal, the output level of the drive signal is maintained as it is.
  • the load resistance detection unit 211 detects the output current value detected by the output current detection unit 18b and the input power value detected by the input current detection unit 6b and the input voltage detection unit 7b. It is determined whether or not there is no load by detecting the load resistance value (step 18). When it is determined that there is no load, it is determined whether or not the instruction input from the operation unit 20 is heating stop (step 19). If the heating is not stopped, it is determined whether or not there is a heating power change instruction instructed from the operation unit 20 (step 20). If there is no change, the process returns to step 15 to continue the internal heating coil heating control process and the like.
  • step 18 it is determined that the outer heating coil 15b is unloaded, for example, when the heating is started, the small-diameter pan 231 is shifted from the center of the heating port (a portion of the pan is located above the outer coil 15b). Then, during cooking, the small-diameter pan 231 is returned to the center of the heating port, and there is no pan above the outer coil 15b. If there is an instruction to change the heating power in step 20, the process returns to step 14 to reset the inner heating coil target power (Win) and the outer heating coil target power (Wout).
  • Win inner heating coil target power
  • Wout outer heating coil target power
  • step 16 If it is determined in step 16 that there is no load, or if it is determined in step 19 that there is a heating stop instruction, the process proceeds to step 11 to stop driving signal output to the inverter circuits 8a and 8b. The process returns to waiting for the heating request (step 1). If no load is detected in the outer heating coil 15b in step 18, the process proceeds to step 7 so that a high-frequency current flows only in the inner heating coil 15a.
  • each pan size when the target power to the inner heating coil 15a and the outer heating coil 15b is set and controlled by the inner heating coil load resistance value (Rin) and the outer heating coil load resistance value (Rout).
  • An example of the pan bottom temperature distribution in is shown in FIG. 9A shows an example of temperature distribution when the small-diameter pan 231 is placed, and FIG. 9B shows an example of temperature distribution when the medium-diameter pan 232 is placed.
  • the pan bottom is not positioned above the external heating coil 15b, and the external heating coil load resistance value Rout becomes small (Rout ⁇ R1).
  • the coil target power (Wout) is 0, and the external heating coil 15b is not energized.
  • the pan bottom is located at a part above the external heating coil 15b, and the external heating coil load resistance value (Rout) is a predetermined value (first value).
  • the outer heating coil load resistance value (Rout) is equal to or greater than a predetermined value (second threshold value R2) (Rout ⁇ R2), it is determined that the large-diameter pan 233 is used, and the inner heating coil is compared with the case of the medium-diameter pan 232
  • the ratio of the outer heating coil heating density to the heating density of 15a is increased. That is, the ratio of the current value (effective value) of the outer heating coil 15b to the current value (effective value) of the inner heating coil 15a is increased.
  • the average heating density is (the heating output of the outer heating coil 15b) / (the area of the outer periphery of the pan (including the portion where there is no heating coil below)).
  • the control unit 19 sets the load resistance value of the external heating coil 15b to a predetermined value.
  • the inverter circuit 8a is controlled so as to increase the ratio of the current value flowing through the outer heating coil 15b to the current value flowing through the inner heating coil 15a as compared with the case where it is determined that the value is less than the value. That is, when the load resistance value of the outer heating coil 15b is greater than or equal to a predetermined value, the medium diameter pan is larger than the large diameter pan 233 where the pan placed on the top plate 22 is larger than the outer diameter of the outer heating coil 15b.
  • the ratio of the external heating coil current (inverter circuit output current for the external heating coil) to the internal heating coil current (internal heating coil inverter circuit output current) was increased. That is, since the ratio of the heating density of the outer heating coil 15b to the heating density of the inner heating coil 15a is increased, the temperature difference between the center of the pan bottom and the outer periphery of the pan bottom can be reduced. It is possible to obtain an induction heating cooker that does not easily cause raw burning at the outer periphery of the pan bottom.
  • the pan to be heated is a non-magnetic large-diameter pan having a small external heating coil load resistance value
  • the external heating coil current is easy to flow because the load resistance value of the external heating coil 15b is small, so no overcurrent flows.
  • the heated pan is limited to the large-diameter pan 233 having a large external heating coil load resistance value, and the heating load for increasing the heating density of the external heating coil 15b is limited to a small heating coil. Since high heating output can be performed with current, no overcurrent flows, so there is no need to limit the output current of the inverter circuit 8a, and the heating distribution by the inner heating coil 15a and the outer heating coil 15b is heated by the output current of the inverter circuit 8a. An induction cooking device that does not change according to the level (low to high heating power) can be obtained.
  • FIG. 10 is a diagram illustrating a configuration of a heating coil of the induction heating cooker according to the second embodiment
  • FIG. 11 is a diagram illustrating a circuit configuration example of the induction heating cooker according to the second embodiment
  • 12 is a diagram showing a positional relationship between the heating coil of the induction heating cooker according to the second embodiment and the pan bottom for each pan size
  • FIG. 13 shows the internal heating of the induction heating cooker according to the second embodiment.
  • FIG. 14 is a diagram showing the relationship between the coil load resistance value, the external heating coil load resistance value, and the pan size placed above the heating coil, and FIG. 14 shows the external heating coil load of the induction heating cooker according to the second embodiment. It is a figure which shows the relationship between resistance value / inner heating coil load resistance value, and an outer heating coil electric power distribution coefficient.
  • FIG. 10 a plurality of heating coils 15a, 15b1 to 15b4 are arranged below the top plate 22 on which a cooking container (such as a pan) to be heated is placed, as in the first embodiment.
  • the inner heating coil 15a is an inner heating coil that heats the center of the pan bottom, which is an object to be heated.
  • the four external heating coils 15b1 to 15b4 are a plurality of external heating coils arranged outside the outer periphery of the internal heating coil 15a so as to surround the internal heating coil 15a. As shown in FIG.
  • the inner heating coil 15a is connected to the inverter circuit 8a.
  • the outer heating coils 15b1 to 15b4 are connected in parallel to the output point of the inverter circuit 8b.
  • Reference numerals 24a and 24b denote output voltage detection means for detecting a high-frequency voltage output from the inverter circuits 8a and 8b and applied to the load circuits 14a and 14b.
  • Reference numerals 25a and 25b denote output voltage detection means 24a and 24b and output current detection means. This is output power detection means that integrates and generates the output power values of the inverter circuits 8a and 8b from the outputs of 18a and 18b.
  • the inverter circuit 8a is driven to apply a high frequency voltage to the load circuit 14a, and the output current detected by the output current detection means 18a and the output power value detected by the output power detection means 25a are obtained.
  • the heating coil resistance value Rin it is possible to determine whether or not a pan suitable for heating is placed above the inner heating coil 15a.
  • the internal heating coil resistance can be discriminated between the case where the proper pan is placed and the case where a small object such as a fork that is not heated is placed.
  • a value threshold R0 is set. The threshold value R0 varies depending on the number of turns of the copper wire of the heating coil, but is set to, for example, about several ⁇ (2 ⁇ to 5 ⁇ ).
  • FIG. 12 (a) there is a pan bottom only above the inner heating coil 15a, and a small-diameter pan 231 is placed above the four outer heating coils 15b1 to 15b4.
  • FIG. 12B shows a case where a medium-sized pan 232 is placed on the inner heating coil 15a and a part of the four outer heating coils 15b1 to 15b4 are covered with a pan bottom, as shown in FIG.
  • the large-diameter pan 233 covered with the pan bottom is placed on the inner heating coil 15a and the four outer heating coils 15b1 to 15b4 as shown in FIG. 12 (c)
  • the inverter circuit 8a is driven and output.
  • the external heating coil load resistance value calculated from the output current value I2 and the output power value W2 of the external heating coils 15b1 to 15b4 detected by the output current detection means 18b and the output power detection means 25b by driving the inverter circuit 8b.
  • Rin Rin
  • the first threshold value r1 of Rout / Rin is the same as when the small-diameter pan 231 (FIG. 12 (a)) where the pan bottom is not positioned at all above the outer heating coils 15b1 to 15b4 and when the outer heating coils 15b1 to 15b4 It sets so that the case where the medium diameter pan 232 (FIG.12 (b)) in which a pan bottom is located in a part above 15b4 is mounted can be discriminate
  • the external heating coil load resistance value with respect to the internal heating coil load resistance value is equal to or greater than a predetermined value (large-diameter pan).
  • the ratio of the heating density of the outer heating coil to the heating density of the inner heating coil is increased as compared with the case where the inner heating coil is less than the predetermined value (medium diameter pan) (the outer heating coil with respect to the amount of current flowing through the inner heating coil)
  • the inverter circuits 8a and 8b are controlled so as to increase the amount of current that is supplied to the inverter.
  • the internal heating coil target power and the external heating coil target power are set as described above and the inverter circuits 8a and 8b are controlled, when a pan suitable for heating is placed, the internal heating coil load resistance value
  • a high-frequency current is applied only to the inner heating coil 15a.
  • the ratio (Rout / Rin) is greater than or equal to r1 and less than r2
  • control is performed such that a high frequency current B1 times that of the inner heating coil 15a is supplied to the outer heating coils 15b1 to 15b4.
  • the outer heating coils 15b1 to 15b4 are controlled to pass a high frequency current B2 times (0 ⁇ B1 ⁇ B2) that of the inner heating coil 15a. Therefore, if the material is suitable for heating, the ratio of the magnitude of the high frequency current of the outer heating coil and the inner heating coil can be adjusted according to the pan size regardless of the material of the pan. Induction that increases the heating density of the external heating coil when there are more parts that are not heated by the external heating coil on the outer periphery, and suppresses the temperature difference between the center of the pan bottom and the outer periphery of the pan bottom regardless of the pan material A cooking device can be obtained.
  • FIG. 11 of the second embodiment an example in which a plurality of external heating coils 15b1 to 15b4 are connected in parallel is shown.
  • individual inverter circuits 8b1 to 8b4 are used.
  • the structure driven may be sufficient and the structure connected in series may be sufficient as shown in FIG.
  • a plurality of outer heating coils 15b1 to 15b4 are arranged adjacent to the periphery of the inner heating coil 15a, and are appropriate (suitable for heating) by the inner heating coil load resistance value Rin.
  • the presence / absence of the pan is determined, and the pan size is determined regardless of the pan material based on the ratio (Rout / Rin) of the inner heating coil load resistance value Rin and the outer heating coil load resistance value Rout, which is larger than the outer heating coil outer diameter.
  • the ratio of the external heating coil current (inverter circuit output current for the internal heating coil) to the internal heating coil current (inverter circuit output current for the internal heating coil) was increased for large-diameter pans larger than the diameter.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

Selon la présente invention, lorsque des moyens de détection de taille de récipient de cuisson, qui détectent la taille d'un récipient de cuisson, ont détecté un article de récipient de cuisson ayant au moins une taille prédéterminée, le rapport de la valeur du courant d'un enroulement de chauffage externe qui chauffe la partie périphérique externe d'un fond de récipient de cuisson à la valeur du courant d'un enroulement de chauffage interne qui chauffe la partie centrale d'un fond de récipient de cuisson est amené à être supérieur à celui quand un article de récipient de cuisson qui est inférieur à la taille prédéterminée est détecté, de façon à accroître ainsi la proportion de chauffage de la partie périphérique externe du fond de récipient de cuisson et à réduire ainsi l'irrégularité de chauffage du fond de récipient de cuisson.
PCT/JP2012/002446 2011-09-20 2012-04-06 Cuiseur à chauffage à induction Ceased WO2013042287A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013534568A JP5642289B2 (ja) 2011-09-20 2012-04-06 誘導加熱調理器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-204218 2011-09-20
JP2011204218 2011-09-20

Publications (1)

Publication Number Publication Date
WO2013042287A1 true WO2013042287A1 (fr) 2013-03-28

Family

ID=47914081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/002446 Ceased WO2013042287A1 (fr) 2011-09-20 2012-04-06 Cuiseur à chauffage à induction

Country Status (2)

Country Link
JP (1) JP5642289B2 (fr)
WO (1) WO2013042287A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104754789A (zh) * 2013-12-25 2015-07-01 美的集团股份有限公司 智能识别锅具大小的电磁加热装置及其控制方法
JP2016207544A (ja) * 2015-04-24 2016-12-08 三菱電機株式会社 誘導加熱調理器
JP2020053323A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
JP2020053321A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
WO2025223888A1 (fr) * 2024-04-26 2025-10-30 BSH Hausgeräte GmbH Procédé de fonctionnement d'un système de détection de batterie de cuisine d'un dispositif de plaque de cuisson à induction, et dispositif de plaque de cuisson à induction

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190230742A1 (en) * 2018-01-25 2019-07-25 Regal Ware, Inc. Cooking Apparatus with Resistive Coating
WO2022030939A1 (fr) * 2020-08-05 2022-02-10 애터미주식회사 Appareil de chauffage électrique intelligent et son procédé de fonctionnement
KR20220017845A (ko) * 2020-08-05 2022-02-14 애터미주식회사 스마트 전기 가열 기기 및 그 동작 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008047463A (ja) * 2006-08-18 2008-02-28 Mitsubishi Electric Corp 誘導加熱調理器
JP2008117638A (ja) * 2006-11-06 2008-05-22 Mitsubishi Electric Corp 誘導加熱装置
JP2009158225A (ja) * 2007-12-26 2009-07-16 Mitsubishi Electric Corp 誘導加熱調理器
JP2011034712A (ja) * 2009-07-30 2011-02-17 Mitsubishi Electric Corp 誘導加熱調理器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004127821A (ja) * 2002-10-04 2004-04-22 Tiger Vacuum Bottle Co Ltd 誘導加熱調理器
CN102342177B (zh) * 2009-03-06 2015-01-21 三菱电机株式会社 感应加热烹调器
JP5289555B2 (ja) * 2009-03-06 2013-09-11 三菱電機株式会社 誘導加熱調理器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008047463A (ja) * 2006-08-18 2008-02-28 Mitsubishi Electric Corp 誘導加熱調理器
JP2008117638A (ja) * 2006-11-06 2008-05-22 Mitsubishi Electric Corp 誘導加熱装置
JP2009158225A (ja) * 2007-12-26 2009-07-16 Mitsubishi Electric Corp 誘導加熱調理器
JP2011034712A (ja) * 2009-07-30 2011-02-17 Mitsubishi Electric Corp 誘導加熱調理器

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104754789A (zh) * 2013-12-25 2015-07-01 美的集团股份有限公司 智能识别锅具大小的电磁加热装置及其控制方法
CN104754789B (zh) * 2013-12-25 2016-08-17 美的集团股份有限公司 智能识别锅具大小的电磁加热装置及其控制方法
JP2016207544A (ja) * 2015-04-24 2016-12-08 三菱電機株式会社 誘導加熱調理器
JP2020053323A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
JP2020053321A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
JP7045615B2 (ja) 2018-09-28 2022-04-01 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
JP7050227B2 (ja) 2018-09-28 2022-04-08 パナソニックＩｐマネジメント株式会社 誘導加熱調理器
WO2025223888A1 (fr) * 2024-04-26 2025-10-30 BSH Hausgeräte GmbH Procédé de fonctionnement d'un système de détection de batterie de cuisine d'un dispositif de plaque de cuisson à induction, et dispositif de plaque de cuisson à induction

Also Published As

Publication number Publication date
JPWO2013042287A1 (ja) 2015-03-26
JP5642289B2 (ja) 2014-12-17

Similar Documents

Publication Publication Date Title
JP5642289B2 (ja) 誘導加熱調理器
JP5495960B2 (ja) 誘導加熱調理器
CN100569030C (zh) 感应加热烹调器
JP2011044422A (ja) 誘導加熱調理器
KR100629334B1 (ko) 유도가열 조리기기 및 그 동작방법
JP2013157162A (ja) 誘導加熱調理器
CN1937864A (zh) 感应加热烹调器
JP5642035B2 (ja) 誘導加熱調理器
JP4915278B2 (ja) 誘導加熱調理器
EP3709769B1 (fr) Appareil de cuisson à induction
JP2016207544A (ja) 誘導加熱調理器
KR20090005142U (ko) 유도가열 조리기
JP2012146599A (ja) 誘導加熱調理器
JP2006114320A (ja) 誘導加熱装置及び誘導加熱調理器
JPH11121159A (ja) 電磁調理器
JP4193154B2 (ja) 誘導加熱調理器
JP2017038427A (ja) 電力変換装置、及び誘導加熱調理器
JP2016072172A (ja) 誘導加熱調理器
JP2007012490A (ja) 誘導加熱調理器
JP4450813B2 (ja) 誘導加熱調理器
JP2011113948A (ja) 誘導加熱調理器
JP4431346B2 (ja) 誘導加熱調理器
JP4325446B2 (ja) 誘導加熱装置
JP4854268B2 (ja) 加熱調理器
JP3625784B2 (ja) インバータ装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12833452

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2013534568

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12833452

Country of ref document: EP

Kind code of ref document: A1