WO2011155217A1 - Induction cooking device - Google Patents

Induction cooking device Download PDF

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Publication number
WO2011155217A1
WO2011155217A1 PCT/JP2011/003303 JP2011003303W WO2011155217A1 WO 2011155217 A1 WO2011155217 A1 WO 2011155217A1 JP 2011003303 W JP2011003303 W JP 2011003303W WO 2011155217 A1 WO2011155217 A1 WO 2011155217A1
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WIPO (PCT)
Prior art keywords
value
voltage
output
predetermined
blown
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PCT/JP2011/003303
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French (fr)
Japanese (ja)
Inventor
祐史 山本
史太佳 小笠原
高志 武平
雅志 木下
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パナソニック株式会社
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2012519280A priority Critical patent/JP5814235B2/en
Publication of WO2011155217A1 publication Critical patent/WO2011155217A1/en

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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

  • the present invention particularly relates to an induction heating cooker that can avoid erroneous detection of blown-down due to a change in capacitance that may occur during normal cooking.
  • FIG. 9 is a block diagram showing a configuration of a conventional induction heating cooker described in Patent Document 1.
  • the induction heating device 10 includes a heating coil 11, an electrode 12, an AC power supply 13, a drive circuit 14, a control circuit 15, and a capacitance measurement circuit 16.
  • the present invention solves the above-described conventional problems. For example, even when the pan is moved, the heating output value is not reduced even if there is a capacitance variation that may occur during normal cooking that is not spilled.
  • An object of the present invention is to provide an induction heating cooker that can avoid erroneous detection of spilling and can continue cooking.
  • An induction cooking device includes a top plate on which a pan is placed, a heating coil that heats the pan, a high-frequency current supply unit that supplies a high-frequency current to the heating coil, and heating of the high-frequency current supply unit.
  • An output setting unit that controls an output value to be a set output value, a control unit that controls the heating operation of the high-frequency current supply unit, an electrode disposed on the lower surface of the top plate, and a capacitor connected to the electrode
  • a high-frequency signal generator for supplying a high-frequency signal; a direct-current voltage converter for inputting the high-frequency signal applied to the electrode and converting the high-frequency signal into a direct-current voltage; and a voltage detector for measuring the output voltage of the direct-current voltage converter
  • a blow-off detection unit having, The blow-off detection unit calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit when there is no blow-off, and detects the blow-off when the increase value is larger than a predetermined increase value. The control unit outputs that the blower has been blown down.
  • the blow-off detection unit changes the heating output value from the set output value to a second set output value smaller than the set output value, and also changes the output voltage of the DC voltage conversion unit before the change.
  • the blow-off is detected.
  • the blow-off detection unit changes the heating output value to the second set output value after a first predetermined standby time has elapsed since the increase value has become larger than the predetermined increase value.
  • the blown-off detection unit is configured such that a difference between the output voltage of the DC voltage conversion unit and the maximum value of the output voltage of the DC voltage conversion unit during the first predetermined standby time is less than a second predetermined decrease value. When it is large, it is characterized by detecting blow-down.
  • the blown-down detection unit is configured to output the first output voltage of the DC voltage conversion unit before the change.
  • the blow-off detection unit is configured to reduce the output voltage of the DC voltage conversion unit before the change to the second set output value with respect to the minimum value of the output voltage of the DC voltage conversion unit during the second predetermined waiting time. When the difference is larger than the second predetermined decrease value, the blow-off is detected.
  • the blown-off detection unit is configured to output a maximum value of the output voltage of the DC voltage converter during the first predetermined standby time and an output of the DC voltage converter during the second predetermined standby time. When the difference with respect to the minimum value of the voltage is larger than the second predetermined decrease value, the blow-off is detected.
  • blow-off detection unit is characterized by detecting blow-off when a difference between the reference value and the output voltage of the DC voltage conversion unit is larger than a third predetermined decrease value.
  • control unit when the control unit receives an output of blown-down detection from the blown-down detection unit when the heating output value is the set output value, the control unit converts the heating output value to the second set output value.
  • the third set output value is decreased to a smaller value, or heating is stopped.
  • blow-off detection unit is configured to intermittently measure the DC voltage conversion unit when a change value of the output voltage of the DC voltage conversion unit within a third predetermined standby time is within a predetermined output voltage range. The output voltage is replaced with the reference value.
  • the induction heating cooker of the present invention it is possible to prevent malfunctions in detection of blown-down due to changes in capacitance that may occur during normal cooking, for example, changes in capacitance when the pan is not moved. The user can continue cooking.
  • the 1st invention sets the heating output value of the top plate which mounts a pan, the heating coil which heats the said pan, the high frequency current supply part which supplies a high frequency current to the said heating coil, and the said high frequency current supply part
  • a control unit that controls the heating operation of the high-frequency current supply unit, having an output setting unit that controls the output value, an electrode disposed on the lower surface of the top plate, and a high-frequency signal supplied to the electrode via a capacitor
  • the blow-off detection unit calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit when there is no blow-off, and detects the blow-off when the increase value is larger than a predetermined increase value.
  • the blown-off detection unit of the first invention changes the heating output value from the set output value to a second set output value smaller than the set output value, and the change before the change.
  • the blow-off is detected.
  • the blown-off detection unit sets the heating output value to the second setting after a first predetermined standby time has elapsed since the increase value is greater than the predetermined increase value. Change to output value.
  • the output voltage rises more aggressively after the first predetermined standby time has elapsed, and it is possible to accurately discriminate between more spilling and false detection due to customer action such as pan slipping.
  • the blow-off detection unit of the third aspect of the present invention relates to the maximum value of the output voltage of the DC voltage conversion unit during the first predetermined waiting time of the output voltage of the DC voltage conversion unit. When the difference is larger than the second predetermined decrease value, the blow-off is detected.
  • the blow-off detection unit of the second or third aspect of the invention changes the second predetermined waiting time after the heating output value is changed to the second set output value.
  • blow-off is detected.
  • the output voltage drop after the change to the second set output value becomes more aggressive, and it is possible to more accurately distinguish between blown down and misdetection due to customer action such as pan slippage, for example. it can.
  • the blown-off detector of the fifth aspect of the invention is characterized in that the second predetermined standby time of the output voltage of the direct-current voltage converter before the change to the second set output value is elapsed.
  • the blow-off is detected.
  • the blown-off detector is configured such that the maximum value of the output voltage of the DC voltage converter during the first predetermined standby time has elapsed and the second predetermined standby time has elapsed.
  • the blow-off is detected.
  • the blow-off detection unit of the first invention detects blow-off when the difference between the reference value and the output voltage of the DC voltage conversion unit is greater than a third predetermined decrease value.
  • the second or third control unit when the second or third control unit receives the output of the blown-down detection from the blown-down detection unit when the heating output value is the set output value, The heating output value is decreased to a third setting output value smaller than the second setting output value, or heating is stopped.
  • the change value of the output voltage of the DC voltage conversion unit within a third predetermined standby time is within a predetermined output voltage range.
  • the output voltage of the DC voltage converter measured intermittently is replaced with the reference value.
  • FIG. 1 is a block diagram showing the configuration of the induction heating cooker according to the first embodiment of the present invention.
  • the induction cooking device includes a top plate 2 on which a pan 1 is placed, a heating coil 3 that heats the pan 1, and a high-frequency current that supplies a high-frequency current to the heating coil 3.
  • the blow-off detection unit 9 calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit 8 when there is no blow-off, and when the increase
  • FIG. 1 a top plate 2 on which the pan 1 is placed, a heating coil 3 that heats the pan 1, a high-frequency current supply unit 4 that supplies a high-frequency current to the heating coil 3, and a heating output value of the high-frequency current supply unit 4
  • a control unit 5 having an output setting unit 18 that controls the heating operation of the high-frequency current supply unit 4, and an electrode 6 disposed on the lower surface of the top plate 2.
  • a high-frequency signal generator 7 that supplies a high-frequency signal to the electrode 6 via a capacitor 17; a DC voltage converter 8 that inputs a high-frequency signal applied to the electrode 6 and converts it to a DC voltage; and an output voltage of the DC voltage converter 8 And a blown-off detector 9 for detecting a blown-off liquid stored in the pan 1 having a voltage detector 19 for measuring the size of the liquid.
  • the common potential of the high-frequency signal generation unit 7, the DC voltage conversion unit 8, and the blow-off detection unit 9 is an unstable potential with respect to the ground (ground), the detection voltage increases with respect to the reference value due to blow-down. There is a case. Thus, even in this case, the present invention can detect the rise of the detection voltage and detect the blow-off.
  • the pan 1 is placed on a top plate 2 that forms part of the outline of the induction heating cooker. At that time, the pan 1 is placed at a position facing the heating coil 3.
  • the top plate 2 often uses crystallized glass, but is not limited thereto.
  • the heating coil 3 is supplied with a high-frequency current from the high-frequency current supply unit 4 that operates according to an instruction of the control unit 5 having the output setting unit 18, and generates a high-frequency magnetic field by the current.
  • An eddy current is generated in the pan 1 that has received a high-frequency magnetic field, and the pan 1 is heated by the eddy current.
  • the control unit 5 having the output setting unit 18 controls the high-frequency current supply unit 4 even when the user starts or stops heating or adjusts the heating output value. Thus, control is performed so as to achieve a desired operation.
  • the electrode 6 is a conductor formed on the lower surface of the top plate 2 by application or adhesion, and forms a capacitor with the conductor on the top plate 2. Usually, there is nothing on the top plate 2, so the electrode 6 and air play a role. However, when another object such as the pan 1, fingers, water, or an object to be cooked is on the top plate 2, the capacitance changes because the relative permittivity of each object is different from that of air. This change in capacitance is detected by a blown-off detector 9 having a voltage detector 19.
  • the blow-off detection unit 9 having the voltage detection unit 19 often detects a change in capacitance by converting it into a change in DC voltage, but is not limited thereto.
  • control unit 5 having the output setting unit 18 operates the high-frequency current supply unit 4 to supply a high-frequency current to the heating coil 3.
  • the control unit 5 having the output setting unit 18 controls the high-frequency current supply unit 4 so as to achieve the thermal power set by the user. Specifically, for example, an input current from the high frequency current supply unit 4 to the heating coil 3 is detected, and the detected value is input to the control unit 5 having the output setting unit 18.
  • the control unit 5 having the output setting unit 18 compares the thermal power set by the user with the input current from the high-frequency current supply unit 4 to the heating coil, and changes the operating state of the high-frequency current supply unit 4.
  • control unit 5 having the output setting unit 18 operates so as to control to the heating power set by the user and maintain the heating power.
  • the object to be cooked in the pot 1 may reach the boiling point, and the object to be cooked may be blown out of the pot 1.
  • the blow-off detection unit 9 calculates an increase value from the reference value that is the output voltage of the DC voltage conversion unit 8 when there is no blow-down, and the increase value is increased by a predetermined amount. When it becomes larger than the value, it is assumed that the blow-off is detected.
  • the heating output value of the induction heating cooker is reduced or the heating is stopped, thereby preventing the blow-off from continuing and improving the safety and cleanability in cooking.
  • FIG. 2 is a flowchart showing the operation of the induction heating cooker according to the second embodiment of the present invention.
  • the blowing zero detection unit 9 of the induction heating cooker according to the second embodiment of the present invention changes the heating output value from the set output value to a second set output value smaller than the set output value, and
  • An induction characterized by detecting a blow-off when a difference between an output voltage of the DC voltage conversion unit 8 before the change and an output voltage of the DC voltage conversion unit 8 after the change is larger than a first predetermined drop value. It is a heating cooker.
  • the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts ( In step 21), it is determined that the blow is not zero (step 26), and the detection of the blow is finished.
  • step 21 when it is determined that the output voltage of the DC voltage converter 8 is greater than the predetermined increase value, it is determined that the blowing is zero (step 21), and the heating output value is changed from the initial set output value to a value smaller than the set output value. 2 is changed to the set output value (step 22).
  • the blow-off detection unit 9 determines that the amount of decrease from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the first predetermined decrease value (step 23).
  • the blow-down detection unit 9 determines that it is not blown (step 27). ). The detection of blown-down ends.
  • the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the first predetermined decrease value (step 23)
  • the blow-off detection unit 9 detects the blow-off (step 24).
  • a blow-off detection signal is output to the control unit 5 (step 25), and the detection of blow-off ends.
  • the behavior is as if the capacitance has been reduced. That is, the output voltage increases.
  • the output voltage of the DC voltage converter 8 rises due to the customer's operation, as in this case, etc., after changing the heating output value from the set output value to the second set output value that is smaller than the set output value
  • the range of decrease from the reference value of the output voltage of the DC voltage converter 8 is smaller than the first predetermined decrease value.
  • the output voltage in the case of pan shifting is less affected by changes in the heating output of induction heating.
  • the blown-down detection unit 9 changes the heating output value from the set output value to a second set output value smaller than the set output value.
  • blow-off is detected.
  • misdetection due to customer's action such as pan misalignment and misdetection due to spilling
  • misdetection due to customer misoperation such as pan misalignment during cooking can be eliminated and cooking can be continued comfortably.
  • the blown zero detection unit 9 outputs the output voltage of the DC voltage conversion unit 8 before the change.
  • the blow-off may be detected.
  • the blow-off detection unit 9 outputs the output voltage of the DC voltage conversion unit 8 during the second predetermined standby time of the output voltage of the DC voltage conversion unit 8 before being changed to the second set output value.
  • the difference with respect to the minimum value is larger than the second predetermined decrease value, it may be possible to detect the blow-off.
  • FIG. 3 is a flowchart showing the operation of the induction heating cooker according to the third embodiment of the present invention.
  • the blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention sets the heating output value after a first predetermined waiting time has elapsed since the increase value is greater than the predetermined increase value.
  • the induction heating cooker is characterized by changing to the second set output value.
  • the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts ( Step 31), it is determined that it is not blown down (step 37), and the detection of blown off ends.
  • step 31 when it is determined that the increase value from the reference value of the output voltage of the DC voltage converter 8 is larger than the predetermined increase value, it is determined that the blowing is zero (step 31), and after the first predetermined standby time has elapsed (step 32).
  • the heating output value is changed from the initial set output value to a second set output value smaller than the set output value (step 33).
  • the blow-down detection unit 9 determines that the blowout is not zero (step 34). 38) The detection of blown-down ends.
  • blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the first predetermined decrease value (step 34)
  • the blow-off detection unit 9 detects the blow-off (step 35).
  • a blow-off detection signal is output to the control unit 5 (step 36), and the blow-off detection ends.
  • the blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention uses the heating output value after the first predetermined waiting time has elapsed since the increase value becomes larger than the predetermined increase value.
  • the increase value of the output voltage of the voltage detector 19 increases more positively when the first predetermined waiting time has elapsed from the start of the blow-off, and the more accurate blow-off Spill detection can be performed. That is, since the increase value of the output voltage of the DC voltage converter 8 is sufficient, the accuracy of the blow-off detection is further improved.
  • the blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention performs the DC voltage conversion when the first predetermined standby time of the output voltage of the DC voltage conversion unit 8 has elapsed.
  • the blow-off may be detected.
  • the blowing zero detection unit 9 of the induction heating cooker according to the third embodiment of the present invention has a second predetermined waiting time after changing the heating output value to the second set output value.
  • the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the elapse of the second predetermined standby time is greater than the second predetermined decrease value after elapse of time, You may make it detect blowing down.
  • the blown-down detection unit 9 of the induction heating cooker according to the third embodiment of the present invention uses the second predetermined value of the output voltage of the DC voltage conversion unit before the change to the second set output value.
  • the difference with respect to the minimum value of the output voltage of the DC voltage conversion unit during the standby time is larger than the second predetermined decrease value, it may be possible to detect blow-off.
  • control unit 5 of the induction heating cooker according to the third embodiment of the present invention is configured so that when the heating output value is the set output value, When the output of the blown-down detection is received, the heating output value may be lowered to a third setting output value smaller than the second setting output value, or heating may be stopped.
  • FIG. 4 is a flowchart showing the operation of the induction heating cooker according to the fourth embodiment of the present invention.
  • FIG. 5 is a graph which shows the change of the output voltage with respect to time of the voltage detection part 19 of the induction heating cooking appliance of FIG.
  • the zero-blow detection unit 9 includes the DC voltage conversion unit 8 in which the first predetermined waiting time of the output voltage of the DC voltage conversion unit 8 has elapsed.
  • the induction heating cooker detects the blow-off.
  • the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention.
  • the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the second predetermined standby time has elapsed is greater than the second predetermined decrease value, It is an induction heating cooker that detects.
  • the blown-down detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention is configured to perform the second predetermined standby of the output voltage of the DC voltage conversion unit 8 before the change to the second set output value. It is an induction heating cooker which detects a blow-off when the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the time is larger than the second predetermined drop value.
  • the blown-off detection unit 9 of the induction heating cooker includes the maximum value of the output voltage of the DC voltage conversion unit 8 during the first predetermined standby time, and the In the induction heating cooker, when the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the second predetermined waiting time is larger than the second predetermined decrease value, the induction heating cooker detects the blow-off.
  • the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts. In step 41), it is determined that the blow is not zero (step 48), and the detection of the blow is finished.
  • the blowing is zero (step 41), and after the first predetermined standby time has elapsed (step 42). ), The heating output value is changed from the initial set output value to a second set output value smaller than the set output value (step 43).
  • the maximum value V MAX of the output voltage of the DC voltage converter 8 during which the first predetermined standby time has elapsed is stored in the memory 9m in the blow-off detector 9 or connected to the outside (step 42).
  • step 43 After the change to the second set output value (step 43), the minimum value V MIN of the output voltage of the DC voltage conversion unit 8 during the second predetermined standby time has elapsed, Store in the memory 9m connected to the outside (step 44).
  • step 45 when the blow-off detection unit 9 determines that the difference in output voltage (V MAX ⁇ V MIN ) between the maximum value V MAX and the minimum value V MIN is smaller than the second predetermined decrease value (step 45), It is determined that the blow is not zero (step 49), and the detection of the blow is finished.
  • blow-off detection unit 9 determines that the difference in output voltage (V MAX ⁇ V MIN ) between the maximum value V MAX and the minimum value V MIN is larger than the second predetermined decrease value (step 45), A spill is detected (step 46), and a spill detection signal is output to the control unit 5 (step 47), and the spill detection is terminated.
  • V MAX the minimum value of the output voltage within the second predetermined standby time after the output voltage of the DC voltage converter 8 is changed to the second set output value is stored.
  • V MIN calculates the difference between the output voltage of the maximum value V MAX and the minimum value V MIN (V MAX -V MIN) , determines the presence or absence of blowing spilled.
  • the zero-blow detection unit 9 includes the DC voltage conversion unit 8 in which the first predetermined waiting time of the output voltage of the DC voltage conversion unit 8 has elapsed. When the difference with respect to the maximum value of the output voltage is larger than the second predetermined decrease value, the blow-off is detected.
  • the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention.
  • the output voltage drop after changing to the second set output value becomes more aggressive, and more accurately distinguishes between blown down and misdetection due to customer action such as pan misalignment, for example. Can do.
  • the blown-down detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention is configured to perform the second predetermined standby of the output voltage of the DC voltage conversion unit 8 before the change to the second set output value.
  • the blow-off is detected.
  • the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention includes the maximum value of the output voltage of the DC voltage conversion unit 8 during the first predetermined standby time, and the When the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the second predetermined standby time has elapsed is larger than the second predetermined decrease value, the blow-off is detected.
  • the blow-off scale is small and the contact area with the electrode 6 is small. In this case, it is possible to solve the problem that the increase value is small and cannot be detected accurately only by the decrease range, and more accurate blow-off detection can be performed.
  • FIG. 6 is a flowchart showing the operation of the induction heating cooker according to the fifth embodiment of the present invention.
  • FIG. 7 is a graph showing a change in output voltage with respect to time of the voltage detection unit 19 of the induction heating cooker of FIG.
  • the blown-off detection unit 9 of the induction heating cooker according to the fifth embodiment of the present invention is blown down. It is an induction heating cooker that detects.
  • step 61 when the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the third predetermined decrease value when the blow-off starts (step 61). It is determined that the blow is not zero (step 64), and the detection of blow is finished.
  • blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the third predetermined decrease value (step 61)
  • the blow-off detection unit 9 detects the blow-off (step 62).
  • a blow-off detection signal is output to the control unit 5 (step 63), and the detection of blow-off ends.
  • FIG. 7 shows that when the decrease width from the reference value of the output voltage of the DC voltage converter 8 exceeds the third predetermined decrease value, the blow-off is detected.
  • the blown-off detection unit 9 of the induction heating cooker according to the fifth embodiment of the present invention is blown down.
  • the influence of the ground becomes dominant due to the spilling near the frame (not shown) that fixes and supports the top plate connected to the ground (ground), and the output voltage that increases the electrostatic capacitance is detected.
  • the blow-off can be detected and detected.
  • FIG. 8 is a graph showing changes in output voltage with respect to time of the voltage detection unit 19 of the induction heating cooker according to the sixth embodiment of the present invention.
  • the blowing zero detection unit 9 has a change value within a third predetermined standby time of the output voltage of the DC voltage conversion unit 8 within a predetermined output voltage range. In some cases, the induction heating cooker replaces the output voltage of the DC voltage converter 8 measured intermittently with the reference value.
  • the blow-off detection unit 9 detects a DC voltage when there is no blow-off when the change value of the output voltage of the DC voltage conversion unit 8 within the third predetermined standby time is within a predetermined output voltage range. It shows that the reference value, which is the output voltage of the converter 8, is replaced with the output voltage of the DC voltage converter 8 measured intermittently at intervals of the third predetermined standby time. As a result, the reference value follows the slow change in electrostatic capacitance and changes in the same manner, and the change value becomes smaller.
  • the predetermined output voltage range here should just be a range which does not impair the heating performance of an induction heating cooking appliance, and is not specifically limited to a specific range.
  • the induction heating cooker according to the present invention it is possible to reliably detect the spilled food and prevent the continuation of the spill while maintaining the cooking performance. It is useful for induction heating cookers used in, etc.

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Abstract

Disclosed is an induction cooking device which comprises: a control unit (5) with an output setting unit (18) that controls the heating operation of a high-frequency current supply unit (4) such that the heating output value of the high-frequency current supply unit (4) reaches a set output value; an electrode (6) positioned on the lower surface of a top plate (2); a high-frequency signal generator (7) that supplies a high-frequency signal to the electrode (6) via a capacitor (17); and a spillover detection unit (9) that has a direct-current voltage conversion unit (8) that inputs the high-frequency signal applied to the electrode (6) and converts same to a direct-current voltage, and a voltage detection unit (19) that measures the size of the output voltage from the direct-current voltage conversion unit (8) and detects spillover of fluid housed in a pot (1). The spillover detection unit (9), which has the voltage detection unit (19), outputs a spillover detection signal to that control unit (5), which has the output setting unit (18).

Description

誘導加熱調理器Induction heating cooker
　本発明は、特に、通常調理時に起こりうる静電容量変化による吹き零れ誤検知を回避することを可能とした誘導加熱調理器に関する。 The present invention particularly relates to an induction heating cooker that can avoid erroneous detection of blown-down due to a change in capacitance that may occur during normal cooking.
　従来、この種の誘導加熱調理器は、静電容量が、所定値よりも増加や減少など変動した場合、吹き零れと判定し、回路を停止させるか、または加熱コイルに流す高周波電流を減少させる構成となっている（例えば、特許文献１参照）。 Conventionally, in this type of induction heating cooker, when the capacitance fluctuates from a predetermined value, such as increase or decrease, it is determined that the blowing is zero and the circuit is stopped or the high-frequency current flowing through the heating coil is decreased. It has a configuration (see, for example, Patent Document 1).
　図９は、特許文献１に記載された従来の誘導加熱調理器の構成を示すブロック図である。図９に示すように、誘導加熱装置１０は、加熱コイル１１と、電極１２と、交流電源１３と、駆動回路１４と、制御回路１５と、静電容量測定回路１６とから構成されている。 FIG. 9 is a block diagram showing a configuration of a conventional induction heating cooker described in Patent Document 1. As shown in FIG. 9, the induction heating device 10 includes a heating coil 11, an electrode 12, an AC power supply 13, a drive circuit 14, a control circuit 15, and a capacitance measurement circuit 16.
特開２００８－１５９４９４号公報JP 2008-159494 A
　しかしながら、前記従来の構成では、静電容量が所定値よりも増加や減少など変動した場合全てにおいて、吹き零れと判定する。 However, in the above-described conventional configuration, in all cases where the capacitance fluctuates from a predetermined value, such as increase or decrease, it is determined that the blowing is zero.
　そのため、通常の調理時に起こりうる静電容量変動、例えば、鍋をずらした場合等、吹き零れでないときの静電容量の増加においても、加熱を停止、もしくは高周波電流を減少させてしまう。そして、吹き零れる可能性がない加熱開始から所定時間内においても、誤検知すると利用者が調理を継続することが不可能であった。 Therefore, even if the capacitance changes that may occur during normal cooking, for example, when the pan is moved, the capacitance is increased when the pan is not blown down, heating is stopped or the high-frequency current is reduced. And even within a predetermined time from the start of heating when there is no possibility of spilling, it is impossible for the user to continue cooking if erroneously detected.
　本発明は、前記従来の課題を解決するもので、例えば、鍋をずらした場合等、吹き零れではない通常調理時に起こりうる静電容量変動がおこっても、加熱出力値を低下させず、吹き零れ誤検知を回避し、継続して調理を行うことができる誘導加熱調理器を提供することを目的とする。 The present invention solves the above-described conventional problems. For example, even when the pan is moved, the heating output value is not reduced even if there is a capacitance variation that may occur during normal cooking that is not spilled. An object of the present invention is to provide an induction heating cooker that can avoid erroneous detection of spilling and can continue cooking.
　本発明に係る誘導加熱調理器は、鍋を載置するトッププレートと、前記鍋を加熱する加熱コイルと、前記加熱コイルに高周波電流を供給する高周波電流供給部と、前記高周波電流供給部の加熱出力値を設定出力値になるよう制御する出力設定部を有し前記高周波電流供給部の加熱動作を制御する制御部と、前記トッププレートの下面に配置した電極と、前記電極にコンデンサを介して高周波信号を供給する高周波信号発生部と、前記電極に加わる前記高周波信号を入力し直流電圧に変換する直流電圧変換部と、前記直流電圧変換部の出力電圧の大きさを測定する電圧検知部を有する吹き零れ検知部と、を備え、
　前記吹き零れ検知部は、吹き零れがない場合の前記直流電圧変換部の出力電圧である基準値からの上昇値を算出し、前記上昇値が所定上昇値より大きくなるときに、吹き零れを検知し前記制御部に吹き零れがあったことを出力することを特徴とする。 An induction cooking device according to the present invention includes a top plate on which a pan is placed, a heating coil that heats the pan, a high-frequency current supply unit that supplies a high-frequency current to the heating coil, and heating of the high-frequency current supply unit. An output setting unit that controls an output value to be a set output value, a control unit that controls the heating operation of the high-frequency current supply unit, an electrode disposed on the lower surface of the top plate, and a capacitor connected to the electrode A high-frequency signal generator for supplying a high-frequency signal; a direct-current voltage converter for inputting the high-frequency signal applied to the electrode and converting the high-frequency signal into a direct-current voltage; and a voltage detector for measuring the output voltage of the direct-current voltage converter A blow-off detection unit having,
The blow-off detection unit calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit when there is no blow-off, and detects the blow-off when the increase value is larger than a predetermined increase value. The control unit outputs that the blower has been blown down.
　また、前記吹き零れ検知部は、前記加熱出力値を前記設定出力値から前記設定出力値より小さい第２設定出力値へ変更するとともに、当該変更前の前記直流電圧変換部の出力電圧の当該変更後の前記直流電圧変換部の出力電圧に対する差が、第１所定低下値より大きいとき、吹き零れを検知することを特徴とする。 Further, the blow-off detection unit changes the heating output value from the set output value to a second set output value smaller than the set output value, and also changes the output voltage of the DC voltage conversion unit before the change. When the difference with respect to the output voltage of the subsequent DC voltage converter is larger than the first predetermined drop value, the blow-off is detected.
　さらに、前記吹き零れ検知部は、前記上昇値が前記所定上昇値より大きくなってから第１所定待機時間が経過後、前記加熱出力値を前記第２設定出力値に変更することを特徴とする。 Furthermore, the blow-off detection unit changes the heating output value to the second set output value after a first predetermined standby time has elapsed since the increase value has become larger than the predetermined increase value. .
　またさらに、前記吹き零れ検知部は、前記直流電圧変換部の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知することを特徴とする。 Still further, the blown-off detection unit is configured such that a difference between the output voltage of the DC voltage conversion unit and the maximum value of the output voltage of the DC voltage conversion unit during the first predetermined standby time is less than a second predetermined decrease value. When it is large, it is characterized by detecting blow-down.
　また、前記吹き零れ検知部は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知することを特徴とする。 In addition, after the second predetermined standby time has elapsed since the heating output value is changed to the second set output value, the blown-down detection unit is configured to output the first output voltage of the DC voltage conversion unit before the change. (2) When the difference with respect to the output voltage of the DC voltage converter after the elapse of a predetermined standby time is larger than the second predetermined decrease value, the blow-off is detected.
　さらに、前記吹き零れ検知部は、前記第２設定出力値に変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知することを特徴とする。 Further, the blow-off detection unit is configured to reduce the output voltage of the DC voltage conversion unit before the change to the second set output value with respect to the minimum value of the output voltage of the DC voltage conversion unit during the second predetermined waiting time. When the difference is larger than the second predetermined decrease value, the blow-off is detected.
　またさらに、前記吹き零れ検知部は、前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値と、前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値よりも大きいとき、吹き零れを検知することを特徴とする。 Still further, the blown-off detection unit is configured to output a maximum value of the output voltage of the DC voltage converter during the first predetermined standby time and an output of the DC voltage converter during the second predetermined standby time. When the difference with respect to the minimum value of the voltage is larger than the second predetermined decrease value, the blow-off is detected.
　また、前記吹き零れ検知部は、前記基準値の前記直流電圧変換部の出力電圧に対する差が、第３所定低下値より大きいとき、吹き零れを検知することを特徴とする。 In addition, the blow-off detection unit is characterized by detecting blow-off when a difference between the reference value and the output voltage of the DC voltage conversion unit is larger than a third predetermined decrease value.
　さらに、前記制御部は、前記加熱出力値が前記設定出力値となっているときに、前記吹き零れ検知部からの吹き零れ検知の出力を受けると、前記加熱出力値を前記第２設定出力値より小さい第３設定出力値に低下するか、もしくは、加熱を停止することを特徴とする。 Furthermore, when the control unit receives an output of blown-down detection from the blown-down detection unit when the heating output value is the set output value, the control unit converts the heating output value to the second set output value. The third set output value is decreased to a smaller value, or heating is stopped.
　またさらに、前記吹き零れ検知部は、前記直流電圧変換部の出力電圧の第３所定待機時間内の変化値が所定の出力電圧範囲以内である場合に、間欠的に測定した前記直流電圧変換部の出力電圧を前記基準値に置き換えることを特徴とする。 Still further, the blow-off detection unit is configured to intermittently measure the DC voltage conversion unit when a change value of the output voltage of the DC voltage conversion unit within a third predetermined standby time is within a predetermined output voltage range. The output voltage is replaced with the reference value.
　本発明の誘導加熱調理器によれば、通常の調理時に起こりうる静電容量変動、例えば、鍋をずらした場合などの吹き零れでないときの静電容量の変化による吹き零れ検知の誤作動を防ぎ、利用者が継続して調理を行うことができる。 According to the induction heating cooker of the present invention, it is possible to prevent malfunctions in detection of blown-down due to changes in capacitance that may occur during normal cooking, for example, changes in capacitance when the pan is not moved. The user can continue cooking.
本発明の第１の実施形態に係る誘導加熱調理器の構成を示すブロック図である。It is a block diagram which shows the structure of the induction heating cooking appliance which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the induction heating cooking appliance which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the induction heating cooking appliance which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the induction heating cooking appliance which concerns on the 4th Embodiment of this invention. 図４の誘導加熱調理器の電圧検知部１９の時間に対する出力電圧の変化を示すグラフである。It is a graph which shows the change of the output voltage with respect to time of the voltage detection part 19 of the induction heating cooking appliance of FIG. 本発明の第５の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the induction heating cooking appliance which concerns on the 5th Embodiment of this invention. 図６の誘導加熱調理器の電圧検知部１９の時間の出力電圧の変化を示すグラフである。It is a graph which shows the change of the output voltage of the time of the voltage detection part 19 of the induction heating cooking appliance of FIG. 本発明の第６の実施形態に係る誘導加熱調理器の電圧検知部１９の時間に対する出力電圧の変化を示すグラフである。It is a graph which shows the change of the output voltage with respect to time of the voltage detection part 19 of the induction heating cooking appliance concerning the 6th Embodiment of this invention. 従来の誘導加熱調理器の構成を示すブロック図である。It is a block diagram which shows the structure of the conventional induction heating cooking appliance.
　第１の発明は、鍋を載置するトッププレートと、前記鍋を加熱する加熱コイルと、前記加熱コイルに高周波電流を供給する高周波電流供給部と、前記高周波電流供給部の加熱出力値を設定出力値になるよう制御する出力設定部を有し前記高周波電流供給部の加熱動作を制御する制御部と、前記トッププレートの下面に配置した電極と、前記電極にコンデンサを介して高周波信号を供給する高周波信号発生部と、前記電極に加わる前記高周波信号を入力し直流電圧に変換する直流電圧変換部と、前記直流電圧変換部の出力電圧の大きさを測定する電圧検知部を有する吹き零れ検知部と、を備え、
　前記吹き零れ検知部は、吹き零れがない場合の前記直流電圧変換部の出力電圧である基準値からの上昇値を算出し、前記上昇値が所定上昇値より大きくなるときに、吹き零れを検知する。 1st invention sets the heating output value of the top plate which mounts a pan, the heating coil which heats the said pan, the high frequency current supply part which supplies a high frequency current to the said heating coil, and the said high frequency current supply part A control unit that controls the heating operation of the high-frequency current supply unit, having an output setting unit that controls the output value, an electrode disposed on the lower surface of the top plate, and a high-frequency signal supplied to the electrode via a capacitor A high-frequency signal generating unit, a direct-current voltage conversion unit that inputs the high-frequency signal applied to the electrode and converts the high-frequency signal into a direct-current voltage, and a voltage detection unit that measures the magnitude of the output voltage of the direct-current voltage conversion unit And comprising
The blow-off detection unit calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit when there is no blow-off, and detects the blow-off when the increase value is larger than a predetermined increase value. To do.
　この構成によると、吹き零れをそのまま継続することなく調理中の安全性を向上させることができる。 According to this configuration, safety during cooking can be improved without continuing spilling.
　第２の発明は、特に、第１の発明の吹き零れ検知部は、前記加熱出力値を前記設定出力値から前記設定出力値より小さい第２設定出力値へ変更するとともに、当該変更前の前記直流電圧変換部の出力電圧の当該変更後の前記直流電圧変換部の出力電圧に対する差が、第１所定低下値より大きいとき、吹き零れを検知する。 In the second invention, in particular, the blown-off detection unit of the first invention changes the heating output value from the set output value to a second set output value smaller than the set output value, and the change before the change. When the difference between the output voltage of the DC voltage converter and the output voltage of the DC voltage converter after the change is larger than the first predetermined drop value, the blow-off is detected.
　この構成によると、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを切り分けることができる。 According to this configuration, it is possible to distinguish between blown down and false detection due to customer action such as panning.
　第３の発明は、特に、第２の発明の吹き零れ検知部は、前記上昇値が前記所定上昇値より大きくなってから第１所定待機時間が経過後、前記加熱出力値を前記第２設定出力値に変更する。 According to a third aspect of the present invention, in particular, the blown-off detection unit according to the second aspect of the present invention sets the heating output value to the second setting after a first predetermined standby time has elapsed since the increase value is greater than the predetermined increase value. Change to output value.
　この構成によると、第１所定待機時間が経過後の出力電圧の上昇がより積極的になり、より吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを正確に切り分けることができる。 According to this configuration, the output voltage rises more aggressively after the first predetermined standby time has elapsed, and it is possible to accurately discriminate between more spilling and false detection due to customer action such as pan slipping.
　第４の発明は、特に、第３の発明の吹き零れ検知部は、前記直流電圧変換部の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知する。 According to a fourth aspect of the present invention, in particular, the blow-off detection unit of the third aspect of the present invention relates to the maximum value of the output voltage of the DC voltage conversion unit during the first predetermined waiting time of the output voltage of the DC voltage conversion unit. When the difference is larger than the second predetermined decrease value, the blow-off is detected.
　この構成によると、吹き零れによる出力電圧の上昇値の大小に関わらず、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とをより正確に切り分けることができる。 According to this configuration, it is possible to more accurately distinguish between blown down and false detection due to customer action such as pan slippage, regardless of the magnitude of the increase in output voltage due to blown down.
　第５の発明は、特に、第２または第３の発明の吹き零れ検知部は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する。 In the fifth aspect of the invention, in particular, the blow-off detection unit of the second or third aspect of the invention changes the second predetermined waiting time after the heating output value is changed to the second set output value. When the difference between the output voltage of the previous DC voltage conversion unit and the output voltage of the DC voltage conversion unit after the elapse of the second predetermined standby time is greater than the second predetermined decrease value, blow-off is detected.
　この構成によると、前記第２設定出力値に変更してからの出力電圧の低下がより積極的になり、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とをより正確に切り分けることができる。 According to this configuration, the output voltage drop after the change to the second set output value becomes more aggressive, and it is possible to more accurately distinguish between blown down and misdetection due to customer action such as pan slippage, for example. it can.
　第６の発明は、特に、第５の発明の吹き零れ検知部は、前記第２設定出力値に変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する。 According to a sixth aspect of the invention, in particular, the blown-off detector of the fifth aspect of the invention is characterized in that the second predetermined standby time of the output voltage of the direct-current voltage converter before the change to the second set output value is elapsed. When the difference with respect to the minimum value of the output voltage of the voltage converter is larger than the second predetermined drop value, the blow-off is detected.
　この構成によると、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とをより正確に切り分けることができる。 According to this configuration, it is possible to more accurately distinguish between blown down and misdetection due to customer action such as panning.
　第７の発明は、特に、第３の発明の吹き零れ検知部は、前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値と、前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値よりも大きいとき、吹き零れを検知する。 According to a seventh aspect of the invention, in particular, in the third aspect of the invention, the blown-off detector is configured such that the maximum value of the output voltage of the DC voltage converter during the first predetermined standby time has elapsed and the second predetermined standby time has elapsed. When the difference with respect to the minimum value of the output voltage of the DC voltage converter is larger than the second predetermined decrease value, the blow-off is detected.
　この構成によると、吹き零れによる出力電圧の上昇値の大小に関わらず、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とをより正確に切り分けることができる。 According to this configuration, it is possible to more accurately distinguish between blown down and false detection due to customer action such as pan slippage, regardless of the magnitude of the increase in output voltage due to blown down.
　第８の発明は、特に、第１の発明の吹き零れ検知部は、前記基準値の前記直流電圧変換部の出力電圧に対する差が、第３所定低下値より大きいとき、吹き零れを検知する。 In the eighth aspect of the invention, in particular, the blow-off detection unit of the first invention detects blow-off when the difference between the reference value and the output voltage of the DC voltage conversion unit is greater than a third predetermined decrease value.
　この構成によると、アースの影響が支配的な、例えばトッププレートに接近した吹き零れなども検知することができる。 According to this configuration, it is possible to detect, for example, a blown-off approaching the top plate where the influence of the earth is dominant.
　第９の発明は、特に、第２又は第３の制御部は、前記加熱出力値が前記設定出力値となっているときに、前記吹き零れ検知部からの吹き零れ検知の出力を受けると、前記加熱出力値を前記第２設定出力値より小さい第３設定出力値に低下するか、または、加熱を停止する。 In the ninth aspect of the invention, in particular, when the second or third control unit receives the output of the blown-down detection from the blown-down detection unit when the heating output value is the set output value, The heating output value is decreased to a third setting output value smaller than the second setting output value, or heating is stopped.
　この構成によると、前記吹き零れがそのまま継続することなく調理中の安全性をより向上させることができる。 According to this configuration, it is possible to further improve the safety during cooking without continuing the spilling as it is.
　第１０の発明は、特に、第１～９のいずれか１つの吹き零れ検知部は、前記直流電圧変換部の出力電圧の第３所定待機時間内の変化値が所定の出力電圧範囲以内である場合に、間欠的に測定した前記直流電圧変換部の出力電圧を前記基準値に置き換える。 In the tenth aspect of the invention, in particular, in any one of the first to ninth blowing detection units, the change value of the output voltage of the DC voltage conversion unit within a third predetermined standby time is within a predetermined output voltage range. In this case, the output voltage of the DC voltage converter measured intermittently is replaced with the reference value.
　この構成によると、例えば、鍋ずれなどのお客様動作が連続的に行われても吹き零れと前記鍋ずれなどのお客様動作を正確に切り分けることができる。 According to this configuration, for example, even if a customer operation such as a pan shift is continuously performed, it is possible to accurately discriminate a customer operation such as a spilling pan and the pan shift.
　以下、本発明の実施形態について、図面を参照しながら説明する。なお、この実施形態の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by the form of this embodiment.
第１の実施形態．
　以下、本発明の第１の実施形態について、図面を参照しながら説明する。 First embodiment.
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
　図１は、本発明の第１の実施形態に係る誘導加熱調理器の構成を示すブロック図である。 FIG. 1 is a block diagram showing the configuration of the induction heating cooker according to the first embodiment of the present invention.
　本発明の第１の実施形態に係る誘導加熱調理器は、鍋１を載置するトッププレート２と、前記鍋１を加熱する加熱コイル３と、前記加熱コイル３に高周波電流を供給する高周波電流供給部４と、前記高周波電流供給部４の加熱出力値を設定出力値になるよう制御する出力設定部１８を有し前記高周波電流供給部４の加熱動作を制御する制御部５と、前記トッププレート２の下面に配置した電極６と、前記電極６にコンデンサ１７を介して高周波信号を供給する高周波信号発生部７と、前記電極６に加わる前記高周波信号を入力し直流電圧に変換する直流電圧変換部８と、前記直流電圧変換部８の出力電圧の大きさを測定する電圧検知部１９を有する吹き零れ検知部９と、を備え、
　前記吹き零れ検知部９は、吹き零れがない場合の前記直流電圧変換部８の出力電圧である基準値からの上昇値を算出し、前記上昇値が所定上昇値より大きくなるときに、吹き零れを検知し前記制御部５に吹き零れがあったことを出力することを特徴とする誘導加熱調理器である。 The induction cooking device according to the first embodiment of the present invention includes a top plate 2 on which a pan 1 is placed, a heating coil 3 that heats the pan 1, and a high-frequency current that supplies a high-frequency current to the heating coil 3. A supply unit 4; an output setting unit 18 that controls the heating output value of the high-frequency current supply unit 4 to be a set output value; the control unit 5 that controls the heating operation of the high-frequency current supply unit 4; An electrode 6 disposed on the lower surface of the plate 2, a high-frequency signal generator 7 that supplies a high-frequency signal to the electrode 6 via a capacitor 17, and a DC voltage that inputs the high-frequency signal applied to the electrode 6 and converts it to a DC voltage A conversion unit 8; and a blow-off detection unit 9 having a voltage detection unit 19 that measures the magnitude of the output voltage of the DC voltage conversion unit 8, and
The blow-off detection unit 9 calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit 8 when there is no blow-off, and when the increase value becomes larger than a predetermined increase value, This is an induction heating cooker that outputs that the control unit 5 has been blown down.
　図１において、鍋１を載置するトッププレート２と、鍋１を加熱する加熱コイル３と、加熱コイル３に高周波電流を供給する高周波電流供給部４と、高周波電流供給部４の加熱出力値が設定出力値になるよう制御する出力設定部１８を有し高周波電流供給部４の加熱動作を制御する出力設定部１８を有した制御部５と、トッププレート２の下面に配置した電極６と、電極６にコンデンサ１７を介して高周波信号を供給する高周波信号発生部７と、電極６に加わる高周波信号を入力し直流電圧に変換する直流電圧変換部８と、直流電圧変換部８の出力電圧の大きさを測定する電圧検知部１９を有した鍋１に収容された液体の吹き零れを検知する吹き零れ検知部９とを備えている。高周波信号発生部７、直流電圧変換部８及び吹き零れ検知部９の共通電位がアース（大地）に対して不安定な電位である場合には、吹き零れにより検知電圧が基準値に対し上昇する場合がある。それで、本発明は、この場合でも検知電圧の上昇を検知して吹き零れの検知ができる。 In FIG. 1, a top plate 2 on which the pan 1 is placed, a heating coil 3 that heats the pan 1, a high-frequency current supply unit 4 that supplies a high-frequency current to the heating coil 3, and a heating output value of the high-frequency current supply unit 4 A control unit 5 having an output setting unit 18 that controls the heating operation of the high-frequency current supply unit 4, and an electrode 6 disposed on the lower surface of the top plate 2. A high-frequency signal generator 7 that supplies a high-frequency signal to the electrode 6 via a capacitor 17; a DC voltage converter 8 that inputs a high-frequency signal applied to the electrode 6 and converts it to a DC voltage; and an output voltage of the DC voltage converter 8 And a blown-off detector 9 for detecting a blown-off liquid stored in the pan 1 having a voltage detector 19 for measuring the size of the liquid. When the common potential of the high-frequency signal generation unit 7, the DC voltage conversion unit 8, and the blow-off detection unit 9 is an unstable potential with respect to the ground (ground), the detection voltage increases with respect to the reference value due to blow-down. There is a case. Thus, even in this case, the present invention can detect the rise of the detection voltage and detect the blow-off.
　鍋１は、誘導加熱調理器の外郭の一部を形成するトッププレート２上に載置される。そのとき、鍋１は加熱コイル３と対向する位置に載置される。トッププレート２は結晶化ガラスを使用することが多いが、それに限定するものではない。 The pan 1 is placed on a top plate 2 that forms part of the outline of the induction heating cooker. At that time, the pan 1 is placed at a position facing the heating coil 3. The top plate 2 often uses crystallized glass, but is not limited thereto.
　加熱コイル３は、出力設定部１８を有する制御部５の指示に従って動作する高周波電流供給部４から高周波電流が供給され、その電流によって高周波磁界を発生させる。高周波磁界を受けた鍋１には渦電流が発生し、その渦電流によって鍋１が加熱される。 The heating coil 3 is supplied with a high-frequency current from the high-frequency current supply unit 4 that operates according to an instruction of the control unit 5 having the output setting unit 18, and generates a high-frequency magnetic field by the current. An eddy current is generated in the pan 1 that has received a high-frequency magnetic field, and the pan 1 is heated by the eddy current.
　出力設定部１８を有する制御部５は、使用者が加熱の開始や停止、あるいは加熱出力値の調節を行った場合にも、出力設定部１８を有する制御部５は高周波電流供給部４を制御して所望の動作となるように制御するものである。 The control unit 5 having the output setting unit 18 controls the high-frequency current supply unit 4 even when the user starts or stops heating or adjusts the heating output value. Thus, control is performed so as to achieve a desired operation.
　電極６は、トッププレート２の下面に塗布または接着などによって形成される導電体であって、トッププレート２上の導電体とでコンデンサを形成する。通常はトッププレート２上には何もない状態であるため、電極６と空気がその役割を果たす。しかし、鍋１、指、水、被調理物などの別の物がトッププレート２上にあると、それぞれの比誘電率が空気と異なるため静電容量が変化する。この静電容量の変化を電圧検知部１９を有する吹き零れ検知部９によって検出する。 The electrode 6 is a conductor formed on the lower surface of the top plate 2 by application or adhesion, and forms a capacitor with the conductor on the top plate 2. Usually, there is nothing on the top plate 2, so the electrode 6 and air play a role. However, when another object such as the pan 1, fingers, water, or an object to be cooked is on the top plate 2, the capacitance changes because the relative permittivity of each object is different from that of air. This change in capacitance is detected by a blown-off detector 9 having a voltage detector 19.
　なお、電圧検知部１９を有する吹き零れ検知部９は、静電容量の変化を直流電圧の変化などに変換して検知するものが多いが、それに限定するものではない。 The blow-off detection unit 9 having the voltage detection unit 19 often detects a change in capacitance by converting it into a change in DC voltage, but is not limited thereto.
　以上のように構成された誘導加熱調理器について、以下その動作、作用を説明する。 The operation and action of the induction heating cooker configured as described above will be described below.
　使用者が加熱の開始を指示すると、出力設定部１８を有する制御部５は高周波電流供給部４を動作させて加熱コイル３に高周波電流を供給する。 When the user instructs the start of heating, the control unit 5 having the output setting unit 18 operates the high-frequency current supply unit 4 to supply a high-frequency current to the heating coil 3.
　これにより、加熱コイル３から高周波磁界が発生し、鍋１の加熱が開始する。 This causes a high frequency magnetic field to be generated from the heating coil 3, and heating of the pan 1 is started.
　出力設定部１８を有する制御部５は、使用者が設定した火力になるように高周波電流供給部４を制御する。具体的には、例えば高周波電流供給部４から加熱コイル３への入力電流を検出し、その検出値を出力設定部１８を有する制御部５へ入力する。 The control unit 5 having the output setting unit 18 controls the high-frequency current supply unit 4 so as to achieve the thermal power set by the user. Specifically, for example, an input current from the high frequency current supply unit 4 to the heating coil 3 is detected, and the detected value is input to the control unit 5 having the output setting unit 18.
　出力設定部１８を有する制御部５は、使用者が設定した火力と高周波電流供給部４から加熱コイルへの入力電流とを比較して、高周波電流供給部４の動作状態を変更する。 The control unit 5 having the output setting unit 18 compares the thermal power set by the user with the input current from the high-frequency current supply unit 4 to the heating coil, and changes the operating state of the high-frequency current supply unit 4.
　このような動作を繰り返すことによって、使用者が設定した火力に制御し、その火力を維持するように出力設定部１８を有する制御部５は動作する。 By repeating such operations, the control unit 5 having the output setting unit 18 operates so as to control to the heating power set by the user and maintain the heating power.
　このようにして鍋１を加熱している際、鍋１内の被調理物が沸点に到達するなどして被調理物が鍋１の外に吹き零れる場合がある。 When the pot 1 is heated in this way, the object to be cooked in the pot 1 may reach the boiling point, and the object to be cooked may be blown out of the pot 1.
　その際、使用者が設定した火力を減少させることなく加熱を継続すると、鍋１から次々に被調理物がこぼれ、被調理物による火傷などに対する不安全性、誘導加熱調理器の吸排気口に被調理物が入って清掃することができなくなるなどの不具合が生じる可能性がある。 At that time, if the heating is continued without reducing the heating power set by the user, the food to be spilled from the pan 1 one after another, unsafeness against burns caused by the food to be cooked, the intake and exhaust of the induction heating cooker There is a possibility that problems such as being unable to clean due to the food to be cooked will occur.
　また、鍋１からトッププレート２上に吹き零れた被調理物が、熱が加わることによってトッププレート２にこびりついてしまう場合があった。 In addition, the food to be cooked that spilled from the pan 1 onto the top plate 2 sometimes stuck to the top plate 2 due to heat.
　そこで、本発明の第１の実施形態では、吹き零れ検知部９は、吹き零れがない場合の直流電圧変換部８の出力電圧である基準値からの上昇値を算出し、上昇値が所定上昇値より大きくなるときに、吹き零れを検知することとしている。 Therefore, in the first embodiment of the present invention, the blow-off detection unit 9 calculates an increase value from the reference value that is the output voltage of the DC voltage conversion unit 8 when there is no blow-down, and the increase value is increased by a predetermined amount. When it becomes larger than the value, it is assumed that the blow-off is detected.
　また、吹き零れを検知すると、誘導加熱調理器の加熱出力値の減少、または、加熱を停止することにより、吹き零れの継続を防止し、調理における安全性や清掃性を向上させることができる。 Moreover, when the blow-off is detected, the heating output value of the induction heating cooker is reduced or the heating is stopped, thereby preventing the blow-off from continuing and improving the safety and cleanability in cooking.
第２の実施形態．
　以下、本発明の第２の実施形態について、フローチャートを参照しながら説明する。 Second embodiment.
Hereinafter, a second embodiment of the present invention will be described with reference to flowcharts.
　図２は、本発明の第２の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。 FIG. 2 is a flowchart showing the operation of the induction heating cooker according to the second embodiment of the present invention.
　なお、第１の実施形態と同じ構成物、動作については説明を省略する。 In addition, description is abbreviate | omitted about the same structure and operation | movement as 1st Embodiment.
　本発明の第２の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記加熱出力値を前記設定出力値から前記設定出力値より小さい第２設定出力値へ変更するとともに、当該変更前の前記直流電圧変換部８の出力電圧の当該変更後の前記直流電圧変換部８の出力電圧に対する差が、第１所定低下値より大きいとき、吹き零れを検知することを特徴とする誘導加熱調理器である。 The blowing zero detection unit 9 of the induction heating cooker according to the second embodiment of the present invention changes the heating output value from the set output value to a second set output value smaller than the set output value, and An induction characterized by detecting a blow-off when a difference between an output voltage of the DC voltage conversion unit 8 before the change and an output voltage of the DC voltage conversion unit 8 after the change is larger than a first predetermined drop value. It is a heating cooker.
　図２において、電圧検知部１９を有する吹き零れ検知部９は、吹き零れが開始することにより、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より小さいと判定すると（ステップ２１）、吹き零れではないと判定し（ステップ２６）、吹き零れの検知は終了する。 In FIG. 2, the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts ( In step 21), it is determined that the blow is not zero (step 26), and the detection of the blow is finished.
　また、直流電圧変換部８の出力電圧が所定上昇値より大きいと判定した場合には、吹き零れと判定し（ステップ２１）、加熱出力値を初期の設定出力値から当該設定出力値より小さい第２設定出力値に変更する（ステップ２２）。 Further, when it is determined that the output voltage of the DC voltage converter 8 is greater than the predetermined increase value, it is determined that the blowing is zero (step 21), and the heating output value is changed from the initial set output value to a value smaller than the set output value. 2 is changed to the set output value (step 22).
　次に、吹き零れ検知部９は、直流電圧変換部８の出力電圧の基準値からの低下幅が第１所定低下値より小さいと判定すると（ステップ２３）、吹き零れでないと判定し（ステップ２７）、吹き零れの検知は終了する。 Next, when the blow-off detection unit 9 determines that the amount of decrease from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the first predetermined decrease value (step 23), the blow-down detection unit 9 determines that it is not blown (step 27). ), The detection of blown-down ends.
　また、吹き零れ検知部９は、直流電圧変換部８の出力電圧の基準値からの低下幅が第１所定低下値より大きいと判定すると（ステップ２３）、吹き零れを検知し（ステップ２４）、制御部５へ吹き零れ検知信号を出力し（ステップ２５）、吹き零れの検知は終了する。 Further, when the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the first predetermined decrease value (step 23), the blow-off detection unit 9 detects the blow-off (step 24). A blow-off detection signal is output to the control unit 5 (step 25), and the detection of blow-off ends.
　ここにおいて、鍋ずらしの場合に静電容量があたかも小さくなったような振る舞いになる。即ち出力電圧は上昇する。この事例などのように、お客様の動作が原因で直流電圧変換部８の出力電圧が上昇した場合には、加熱出力値を設定出力値から設定出力値よりも小さい第２設定出力値へ変更後の直流電圧変換部８の出力電圧の基準値からの低下幅は第１所定低下値よりも小さい。鍋ずらしの場合の出力電圧は、誘導加熱の加熱出力の変化による影響が小さい。 In this case, when the pan is moved, the behavior is as if the capacitance has been reduced. That is, the output voltage increases. When the output voltage of the DC voltage converter 8 rises due to the customer's operation, as in this case, etc., after changing the heating output value from the set output value to the second set output value that is smaller than the set output value The range of decrease from the reference value of the output voltage of the DC voltage converter 8 is smaller than the first predetermined decrease value. The output voltage in the case of pan shifting is less affected by changes in the heating output of induction heating.
　本発明の第２の実施形態に係る誘導加熱調理器によると、前記吹き零れ検知部９は、前記加熱出力値を前記設定出力値から前記設定出力値より小さい第２設定出力値へ変更するとともに、当該変更前の前記直流電圧変換部８の出力電圧の当該変更後の前記直流電圧変換部８の出力電圧に対する差が、第１所定低下値より大きいとき、吹き零れを検知する。 According to the induction heating cooker according to the second embodiment of the present invention, the blown-down detection unit 9 changes the heating output value from the set output value to a second set output value smaller than the set output value. When the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the change is larger than a first predetermined drop value, blow-off is detected.
　従って、鍋ずれなどのお客様による動作による誤検知と吹き零れによる誤検知とを分別することによって調理中の鍋ずれなどのお客様による動作による誤検知がなくなり快適に調理を継続することができる。 Therefore, by separating misdetection due to customer's action such as pan misalignment and misdetection due to spilling, misdetection due to customer misoperation such as pan misalignment during cooking can be eliminated and cooking can be continued comfortably.
　好ましくは、前記吹き零れ検知部９は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知するようにしてもよい。 Preferably, after the second predetermined waiting time has elapsed since the heating output value was changed to the second set output value, the blown zero detection unit 9 outputs the output voltage of the DC voltage conversion unit 8 before the change. When the difference with respect to the output voltage of the DC voltage converter after the second predetermined standby time elapses is larger than the second predetermined decrease value, the blow-off may be detected.
　好ましくは、前記吹き零れ検知部９は、前記第２設定出力値に変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知するようにしてもよい。 Preferably, the blow-off detection unit 9 outputs the output voltage of the DC voltage conversion unit 8 during the second predetermined standby time of the output voltage of the DC voltage conversion unit 8 before being changed to the second set output value. When the difference with respect to the minimum value is larger than the second predetermined decrease value, it may be possible to detect the blow-off.
第３の実施形態．
　以下、本発明の第３の実施形態について、フローチャートを参照しながら説明する。 Third embodiment.
Hereinafter, a third embodiment of the present invention will be described with reference to flowcharts.
　図３は、本発明の第３の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。 FIG. 3 is a flowchart showing the operation of the induction heating cooker according to the third embodiment of the present invention.
　なお、第１の実施形態と同じ構成物、動作については説明を省略する。 In addition, description is abbreviate | omitted about the same structure and operation | movement as 1st Embodiment.
　本発明の第３の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記上昇値が前記所定上昇値より大きくなってから第１所定待機時間が経過後、前記加熱出力値を前記第２設定出力値に変更することを特徴とする誘導加熱調理器である。 The blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention sets the heating output value after a first predetermined waiting time has elapsed since the increase value is greater than the predetermined increase value. The induction heating cooker is characterized by changing to the second set output value.
　図３において、電圧検知部１９を有する吹き零れ検知部９は、吹き零れが開始することにより、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より小さいと判定すると（ステップ３１）、吹き零れではないと判定し（ステップ３７）、吹き零れの検知は終了する。 In FIG. 3, the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts ( Step 31), it is determined that it is not blown down (step 37), and the detection of blown off ends.
　また、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より大きいと判定した場合には吹き零れと判定し（ステップ３１）、第１所定待機時間が経過後（ステップ３２）、加熱出力値を初期の設定出力値から当該設定出力値より小さい第２設定出力値に変更する（ステップ３３）。 Further, when it is determined that the increase value from the reference value of the output voltage of the DC voltage converter 8 is larger than the predetermined increase value, it is determined that the blowing is zero (step 31), and after the first predetermined standby time has elapsed (step 32). The heating output value is changed from the initial set output value to a second set output value smaller than the set output value (step 33).
　次に、吹き零れ検知部９は、直流電圧変換部８の出力電圧の基準値からの低下幅が第１所定低下値より小さいと判定すると（ステップ３４）、吹き零れではないと判定し（ステップ３８）、吹き零れの検知は終了する。 Next, if the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the first predetermined decrease value (step 34), the blow-down detection unit 9 determines that the blowout is not zero (step 34). 38) The detection of blown-down ends.
　また、吹き零れ検知部９は、直流電圧変換部８の出力電圧の基準値からの低下幅が第１所定低下値より大きいと判定すると（ステップ３４）、吹き零れを検知し（ステップ３５）、制御部５へ吹き零れ検知信号を出力し（ステップ３６）、吹き零れの検知は終了する。 Further, when the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the first predetermined decrease value (step 34), the blow-off detection unit 9 detects the blow-off (step 35). A blow-off detection signal is output to the control unit 5 (step 36), and the blow-off detection ends.
　本発明の第３の実施形態に係る誘導加熱調理器の吹き零れ検知部９は、前記上昇値が前記所定上昇値より大きくなってから第１所定待機時間が経過後、前記加熱出力値を前記第２設定出力値に変更するため、吹き零れの開始から第１所定待機時間が経過することにより電圧検知部１９の出力電圧の上昇値がより積極的に上昇するようになり、さらに正確な吹き零れ検知を行うことができる。即ち、直流電圧変換部８の出力電圧の上昇値が十分となるため、吹き零れ検知の精度がさらに向上する。 The blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention uses the heating output value after the first predetermined waiting time has elapsed since the increase value becomes larger than the predetermined increase value. In order to change to the second set output value, the increase value of the output voltage of the voltage detector 19 increases more positively when the first predetermined waiting time has elapsed from the start of the blow-off, and the more accurate blow-off Spill detection can be performed. That is, since the increase value of the output voltage of the DC voltage converter 8 is sufficient, the accuracy of the blow-off detection is further improved.
　好ましくは、本発明の第３の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記直流電圧変換部８の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知するようにしてもよい。 Preferably, the blow-off detection unit 9 of the induction heating cooker according to the third embodiment of the present invention performs the DC voltage conversion when the first predetermined standby time of the output voltage of the DC voltage conversion unit 8 has elapsed. When the difference with respect to the maximum value of the output voltage of the unit 8 is larger than the second predetermined decrease value, the blow-off may be detected.
　さらに好ましくは、本発明の第３の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部８の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知するようにしてもよい。 More preferably, the blowing zero detection unit 9 of the induction heating cooker according to the third embodiment of the present invention has a second predetermined waiting time after changing the heating output value to the second set output value. When the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the elapse of the second predetermined standby time is greater than the second predetermined decrease value after elapse of time, You may make it detect blowing down.
　さらに好ましくは、本発明の第３の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記第２設定出力値に変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知するようにしてもよい。 More preferably, the blown-down detection unit 9 of the induction heating cooker according to the third embodiment of the present invention uses the second predetermined value of the output voltage of the DC voltage conversion unit before the change to the second set output value. When the difference with respect to the minimum value of the output voltage of the DC voltage conversion unit during the standby time is larger than the second predetermined decrease value, it may be possible to detect blow-off.
　またさらに好ましくは、本発明の第３の実施形態に係る誘導加熱調理器の前記制御部５は、前記加熱出力値が前記設定出力値となっているときに、前記吹き零れ検知部９からの吹き零れ検知の出力を受けると、前記加熱出力値を前記第２設定出力値より小さい第３設定出力値に低下するか、もしくは、加熱を停止するようにしてもよい。 Still more preferably, the control unit 5 of the induction heating cooker according to the third embodiment of the present invention is configured so that when the heating output value is the set output value, When the output of the blown-down detection is received, the heating output value may be lowered to a third setting output value smaller than the second setting output value, or heating may be stopped.
第４の実施形態．
　以下、本発明の第４の実施形態について、フローチャートを参照しながら説明する。 Fourth embodiment.
Hereinafter, a fourth embodiment of the present invention will be described with reference to flowcharts.
　図４は、本発明の第４の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。また、図５は、図４の誘導加熱調理器の電圧検知部１９の時間に対する出力電圧の変化を示すグラフである。 FIG. 4 is a flowchart showing the operation of the induction heating cooker according to the fourth embodiment of the present invention. Moreover, FIG. 5 is a graph which shows the change of the output voltage with respect to time of the voltage detection part 19 of the induction heating cooking appliance of FIG.
　なお、第１の実施形態と同じ構成物、動作については説明を省略する。 In addition, description is abbreviate | omitted about the same structure and operation | movement as 1st Embodiment.
　本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記直流電圧変換部８の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知する誘導加熱調理器である。 In the induction heating cooker according to the fourth embodiment of the present invention, the zero-blow detection unit 9 includes the DC voltage conversion unit 8 in which the first predetermined waiting time of the output voltage of the DC voltage conversion unit 8 has elapsed. When the difference with respect to the maximum value of the output voltage is larger than the second predetermined decrease value, the induction heating cooker detects the blow-off.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部８の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する誘導加熱調理器である。 Moreover, after the elapse of the second predetermined waiting time after the heating output value is changed to the second set output value, the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention. When the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the second predetermined standby time has elapsed is greater than the second predetermined decrease value, It is an induction heating cooker that detects.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記第２設定出力値に変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する誘導加熱調理器である。 In addition, the blown-down detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention is configured to perform the second predetermined standby of the output voltage of the DC voltage conversion unit 8 before the change to the second set output value. It is an induction heating cooker which detects a blow-off when the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the time is larger than the second predetermined drop value.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記第１所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最大値と、前記第２所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最小値に対する差が、前記第２所定低下値よりも大きいとき、吹き零れを検知する誘導加熱調理器である。 In addition, the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention includes the maximum value of the output voltage of the DC voltage conversion unit 8 during the first predetermined standby time, and the In the induction heating cooker, when the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the second predetermined waiting time is larger than the second predetermined decrease value, the induction heating cooker detects the blow-off.
　図４において、電圧検知部１９を有する吹き零れ検知部９は、吹き零れが開始することにより、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より小さいと判定すると（ステップ４１）、吹き零れではないと判定し（ステップ４８）、吹き零れの検知は終了する。 In FIG. 4, the blow-off detection unit 9 having the voltage detection unit 19 determines that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the predetermined increase value when the blow-down starts. In step 41), it is determined that the blow is not zero (step 48), and the detection of the blow is finished.
　また、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より大きいと判定した場合には吹き零れと判定し（ステップ４１）、第１所定待機時間が経過後（ステップ４２）、加熱出力値を初期の設定出力値から当該設定出力値より小さい第２設定出力値に変更する（ステップ４３）。 Further, when it is determined that the increase value from the reference value of the output voltage of the DC voltage converter 8 is larger than the predetermined increase value, it is determined that the blowing is zero (step 41), and after the first predetermined standby time has elapsed (step 42). ), The heating output value is changed from the initial set output value to a second set output value smaller than the set output value (step 43).
　なお、第１所定待機時間が経過中の直流電圧変換部８の出力電圧の最大値ＶＭＡＸを吹き零れ検知部９内の、または、外部に接続したメモリ９ｍへ記憶する（ステップ４２）。 Note that the maximum value V MAX of the output voltage of the DC voltage converter 8 during which the first predetermined standby time has elapsed is stored in the memory 9m in the blow-off detector 9 or connected to the outside (step 42).
　次に、第２設定出力値に変更（ステップ４３）の後、第２所定待機時間が経過中の直流電圧変換部８の出力電圧の最小値ＶＭＩＮを吹き零れ検知部９内の、または、外部に接続したメモリ９ｍへ記憶する（ステップ４４）。 Next, after the change to the second set output value (step 43), the minimum value V MIN of the output voltage of the DC voltage conversion unit 8 during the second predetermined standby time has elapsed, Store in the memory 9m connected to the outside (step 44).
　次に、吹き零れ検知部９は、最大値ＶＭＡＸと最小値ＶＭＩＮとの出力電圧の差（ＶＭＡＸ－ＶＭＩＮ）が、第２所定低下値よりも小さいと判定すると（ステップ４５）、吹き零れではないと判定し（ステップ４９）、吹き零れの検知は終了する。 Next, when the blow-off detection unit 9 determines that the difference in output voltage (V MAX −V MIN ) between the maximum value V MAX and the minimum value V MIN is smaller than the second predetermined decrease value (step 45), It is determined that the blow is not zero (step 49), and the detection of the blow is finished.
　また、吹き零れ検知部９は、最大値ＶＭＡＸと最小値ＶＭＩＮとの出力電圧の差（ＶＭＡＸ－ＶＭＩＮ）が、第２所定低下値よりも大きいと判定すると（ステップ４５）、吹き零れを検知し（ステップ４６）、制御部５へ吹き零れ検知信号を出力し（ステップ４７）、そして、吹き零れの検知は終了する。 Further, when the blow-off detection unit 9 determines that the difference in output voltage (V MAX −V MIN ) between the maximum value V MAX and the minimum value V MIN is larger than the second predetermined decrease value (step 45), A spill is detected (step 46), and a spill detection signal is output to the control unit 5 (step 47), and the spill detection is terminated.
　図５において、直流電圧変換部８の出力電圧の基準値からの上昇値が所定上昇値より大きくなることを検知した時から第１所定待機時間内の直流電圧変換部８の出力電圧の最大値ＶＭＡＸを記憶する。その後、直流電圧変換部８の出力電圧を第２設定出力値に変更した後の第２所定待機時間内の出力電圧の最小値ＶＭＩＮを記憶する。最小値ＶＭＩＮを記憶した後、最大値ＶＭＡＸと最小値ＶＭＩＮとの出力電圧の差（ＶＭＡＸ－ＶＭＩＮ）を算出し、吹き零れの有無を判定する。 In FIG. 5, the maximum value of the output voltage of the DC voltage conversion unit 8 within the first predetermined standby time from when it is detected that the increase value from the reference value of the output voltage of the DC voltage conversion unit 8 is greater than the predetermined increase value. Store V MAX . Thereafter, the minimum value V MIN of the output voltage within the second predetermined standby time after the output voltage of the DC voltage converter 8 is changed to the second set output value is stored. After storing the minimum value V MIN, calculates the difference between the output voltage of the maximum value V MAX and the minimum value V MIN (V MAX -V MIN) , determines the presence or absence of blowing spilled.
　本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記直流電圧変換部８の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知する。 In the induction heating cooker according to the fourth embodiment of the present invention, the zero-blow detection unit 9 includes the DC voltage conversion unit 8 in which the first predetermined waiting time of the output voltage of the DC voltage conversion unit 8 has elapsed. When the difference with respect to the maximum value of the output voltage is larger than the second predetermined decrease value, the blow-off is detected.
　この構成によると、吹き零れによる出力電圧の上昇値の大小に関わらず、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを、より正確に切り分けることができる。 According to this configuration, it is possible to more accurately discriminate between blown down and false detection due to customer action such as pan deviation, regardless of the magnitude of the increase in output voltage due to blown down.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部８の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する。 Moreover, after the elapse of the second predetermined waiting time after the heating output value is changed to the second set output value, the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention. When the difference between the output voltage of the DC voltage conversion unit 8 before the change and the output voltage of the DC voltage conversion unit 8 after the second predetermined standby time has elapsed is greater than the second predetermined decrease value, Is detected.
　この構成によると、前記第２設定出力値に変更してからの出力電圧の低下がより積極的になり、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを、より正確に切り分けることができる。 According to this configuration, the output voltage drop after changing to the second set output value becomes more aggressive, and more accurately distinguishes between blown down and misdetection due to customer action such as pan misalignment, for example. Can do.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記第２設定出力値に変更前の前記直流電圧変換部８の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知する。 In addition, the blown-down detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention is configured to perform the second predetermined standby of the output voltage of the DC voltage conversion unit 8 before the change to the second set output value. When the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the time is larger than the second predetermined decrease value, the blow-off is detected.
　この構成によると、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを、より正確に切り分けることができる。 According to this configuration, it is possible to more accurately distinguish between blown down and misdetection due to customer actions such as panning.
　また、本発明の第４の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記第１所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最大値と、前記第２所定待機時間が経過中の前記直流電圧変換部８の出力電圧の最小値に対する差が、前記第２所定低下値よりも大きいとき、吹き零れを検知する。 In addition, the blown-off detection unit 9 of the induction heating cooker according to the fourth embodiment of the present invention includes the maximum value of the output voltage of the DC voltage conversion unit 8 during the first predetermined standby time, and the When the difference with respect to the minimum value of the output voltage of the DC voltage converter 8 during the second predetermined standby time has elapsed is larger than the second predetermined decrease value, the blow-off is detected.
　この構成によると、吹き零れによる出力電圧の上昇値の大小に関わらず、吹き零れと、例えば鍋ずれなどのお客様動作による誤検知とを、より正確に切り分けることができる。 According to this configuration, it is possible to more accurately discriminate between blown down and false detection due to customer action such as pan deviation, regardless of the magnitude of the increase in output voltage due to blown down.
さらには、吹き零れが開始し、電圧検知部１９の直流電圧変換部８の出力電圧を最大値からの低下幅のみで検知しようとすると、吹き零れ規模が小さくて電極６との接触面積が少ない場合には前記上昇値が小さく前記低下幅のみでは正確に検知できないという問題を解消することができ、より正確な吹き零れ検知を行うことができる。 Furthermore, when the blow-off starts and an attempt is made to detect the output voltage of the DC voltage conversion unit 8 of the voltage detection unit 19 with only a decrease from the maximum value, the blow-off scale is small and the contact area with the electrode 6 is small. In this case, it is possible to solve the problem that the increase value is small and cannot be detected accurately only by the decrease range, and more accurate blow-off detection can be performed.
第５の実施形態．
　以下、本発明の第５の実施形態について、フローチャートを参照しながら説明する。 Fifth embodiment.
Hereinafter, a fifth embodiment of the present invention will be described with reference to flowcharts.
　図６は、本発明の第５の実施形態に係る誘導加熱調理器の動作を示すフローチャートである。 FIG. 6 is a flowchart showing the operation of the induction heating cooker according to the fifth embodiment of the present invention.
　図７は、図６の誘導加熱調理器の電圧検知部１９の時間に対する出力電圧の変化を示すグラフである。 FIG. 7 is a graph showing a change in output voltage with respect to time of the voltage detection unit 19 of the induction heating cooker of FIG.
　なお、第１の実施形態と同じ構成物、動作については説明を省略する。 In addition, description is abbreviate | omitted about the same structure and operation | movement as 1st Embodiment.
　本発明の第５の実施形態に係る誘導加熱調理器の吹き零れ検知部９は、前記基準値の前記直流電圧変換部８の出力電圧に対する差が、第３所定低下値より大きいとき、吹き零れを検知する誘導加熱調理器である。 When the difference between the reference value and the output voltage of the DC voltage converter 8 is greater than a third predetermined decrease value, the blown-off detection unit 9 of the induction heating cooker according to the fifth embodiment of the present invention is blown down. It is an induction heating cooker that detects.
　図６において、吹き零れ検知部９は、吹き零れが開始することにより、直流電圧変換部８の出力電圧の基準値からの低下幅が第３所定低下値より小さいと判定すると（ステップ６１）、吹き零れではないと判定し（ステップ６４）、吹き零れの検知は終了する。 In FIG. 6, when the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is smaller than the third predetermined decrease value when the blow-off starts (step 61). It is determined that the blow is not zero (step 64), and the detection of blow is finished.
　また、吹き零れ検知部９は、直流電圧変換部８の出力電圧の基準値からの低下幅が第３所定低下値より大きいと判定すると（ステップ６１）、吹き零れを検知し（ステップ６２）、制御部５へ吹き零れ検知信号を出力し（ステップ６３）、そして、吹き零れの検知は終了する。 Further, if the blow-off detection unit 9 determines that the decrease width from the reference value of the output voltage of the DC voltage conversion unit 8 is larger than the third predetermined decrease value (step 61), the blow-off detection unit 9 detects the blow-off (step 62). A blow-off detection signal is output to the control unit 5 (step 63), and the detection of blow-off ends.
　図７において、直流電圧変換部８の出力電圧の基準値からの低下幅が第３所定低下値を超えたとき、吹き零れを検知することが示されている。 FIG. 7 shows that when the decrease width from the reference value of the output voltage of the DC voltage converter 8 exceeds the third predetermined decrease value, the blow-off is detected.
　本発明の第５の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記基準値の前記直流電圧変換部の出力電圧に対する差が、第３所定低下値より大きいとき、吹き零れを検知することにより、アース（大地）に接続されたトッププレートを固定支持するフレーム（図示していない）付近への吹き零れによりアースの影響が支配的となり静電容量が増加しる出力電圧が低下する場合の吹き零れも低下値を検出し検知することができる。 When the difference between the reference value and the output voltage of the DC voltage converter is greater than a third predetermined decrease value, the blown-off detection unit 9 of the induction heating cooker according to the fifth embodiment of the present invention is blown down. As a result, the influence of the ground becomes dominant due to the spilling near the frame (not shown) that fixes and supports the top plate connected to the ground (ground), and the output voltage that increases the electrostatic capacitance is detected. When the pressure drops, the blow-off can be detected and detected.
第６の実施形態．
　以下、本発明の第６の実施形態について、グラフを参照しながら説明する。 Sixth embodiment.
Hereinafter, a sixth embodiment of the present invention will be described with reference to graphs.
　図８は、本発明の第６の実施形態に係る誘導加熱調理器の電圧検知部１９の時間に対する出力電圧の変化を示すグラフである。 FIG. 8 is a graph showing changes in output voltage with respect to time of the voltage detection unit 19 of the induction heating cooker according to the sixth embodiment of the present invention.
　なお、第１の実施形態と同じ構成物、動作については説明を省略する。 In addition, description is abbreviate | omitted about the same structure and operation | movement as 1st Embodiment.
　本発明の第６の実施形態に係る誘導加熱調理器の前記吹き零れ検知部９は、前記直流電圧変換部８の出力電圧の第３所定待機時間内の変化値が所定の出力電圧範囲以内である場合に、間欠的に測定した前記直流電圧変換部８の出力電圧を前記基準値に置き換える誘導加熱調理器である。 In the induction heating cooker 9 according to the sixth embodiment of the present invention, the blowing zero detection unit 9 has a change value within a third predetermined standby time of the output voltage of the DC voltage conversion unit 8 within a predetermined output voltage range. In some cases, the induction heating cooker replaces the output voltage of the DC voltage converter 8 measured intermittently with the reference value.
　図８において、吹き零れ検知部９は、直流電圧変換部８の出力電圧の第３所定待機時間内の変化値が、所定の出力電圧範囲以内である場合に、吹き零れがない場合の直流電圧変換部８の出力電圧である基準値を、第３所定待機時間の間隔で間欠的に測定した直流電圧変換部８の出力電圧で置き換えることを示している。これにより、ゆっくりとした静電容量の変化に基準値も追随して同様の変化をすることとなり変化値が小さくなる。なお、ここにおける所定の出力電圧範囲とは、誘導加熱調理器の加熱性能を損なわない範囲であればよく、特に、具体的な範囲に限定されるものではない。 In FIG. 8, the blow-off detection unit 9 detects a DC voltage when there is no blow-off when the change value of the output voltage of the DC voltage conversion unit 8 within the third predetermined standby time is within a predetermined output voltage range. It shows that the reference value, which is the output voltage of the converter 8, is replaced with the output voltage of the DC voltage converter 8 measured intermittently at intervals of the third predetermined standby time. As a result, the reference value follows the slow change in electrostatic capacitance and changes in the same manner, and the change value becomes smaller. In addition, the predetermined output voltage range here should just be a range which does not impair the heating performance of an induction heating cooking appliance, and is not specifically limited to a specific range.
　従って、ゆっくり鍋をずらした場合、布巾ふきをした場合、おたまなどの金属製の調理器具を使用した場合などのお客様動作が連続的に行われても、吹き零れとお客様動作による誤検知とを正確に切り分けることができ、快適に調理を継続することができる。 Therefore, even if the customer moves continuously, such as when the pan is moved slowly, a cloth is wiped, or a metal cooking utensil such as a tama is used, it will not be possible to detect a blown-off and a false detection due to the customer's operation. It can be accurately cut and cooking can be continued comfortably.
　なお、第６の実施形態の構成は上述した他の実施形態全てにおいても適用可能である。 Note that the configuration of the sixth embodiment can be applied to all the other embodiments described above.
　以上、詳述したように本発明に係る誘導加熱調理器によれば、吹き零れた被調理物を確実に検知し、調理性能を維持したまま吹き零れの継続を防止することができ、一般家庭などで使用される誘導加熱調理器に有用である。 As described above in detail, according to the induction heating cooker according to the present invention, it is possible to reliably detect the spilled food and prevent the continuation of the spill while maintaining the cooking performance. It is useful for induction heating cookers used in, etc.
　１　鍋、
　２　トッププレート、
　３、１１　加熱コイル、
　４　高周波電流供給部、
　５　出力設定部１８を有する制御部、
　６、１２　電極、
　７　高周波信号発生部、
　８　直流電圧変換部、
　９　　電圧検知部１９を有する吹き零れ検知部、
　９ｍ　メモリ
　１０　誘導加熱装置、
　１３　交流電源、
　１４　駆動回路、
　１５　制御回路、
　１６　静電容量測定回路、
　１７　コンデンサ、
　１８　出力設定部、
　１９　電圧検知部。 1 pan,
2 Top plate,
3, 11 Heating coil,
4 High-frequency current supply unit,
5 a control unit having an output setting unit 18;
6, 12 electrodes,
7 High-frequency signal generator,
8 DC voltage converter,
9 A blow-off detector having a voltage detector 19;
9m memory 10 induction heating device,
13 AC power supply,
14 drive circuit,
15 control circuit,
16 capacitance measurement circuit,
17 capacitors,
18 Output setting section,
19 Voltage detector.

Claims (10)

  1. 　鍋を載置するトッププレートと、前記鍋を加熱する加熱コイルと、前記加熱コイルに高周波電流を供給する高周波電流供給部と、前記高周波電流供給部の加熱出力値を設定出力値になるよう制御する出力設定部を有し前記高周波電流供給部の加熱動作を制御する制御部と、前記トッププレートの下面に配置した電極と、前記電極にコンデンサを介して高周波信号を供給する高周波信号発生部と、前記電極に加わる前記高周波信号を入力し直流電圧に変換する直流電圧変換部と、前記直流電圧変換部の出力電圧の大きさを測定する電圧検知部を有する吹き零れ検知部と、を備え、
    　前記吹き零れ検知部は、吹き零れがない場合の前記直流電圧変換部の出力電圧である基準値からの上昇値を算出し、前記上昇値が所定上昇値より大きくなるときに、吹き零れを検知し前記制御部に吹き零れがあったことを出力することを特徴とする誘導加熱調理器。     A top plate on which the pan is placed, a heating coil for heating the pan, a high-frequency current supply unit for supplying a high-frequency current to the heating coil, and a heating output value of the high-frequency current supply unit are controlled to be set output values A control unit that controls the heating operation of the high-frequency current supply unit, an electrode disposed on a lower surface of the top plate, and a high-frequency signal generation unit that supplies a high-frequency signal to the electrode via a capacitor; A DC voltage conversion unit that inputs the high-frequency signal applied to the electrode and converts the high-frequency signal into a DC voltage, and a blow-off detection unit that includes a voltage detection unit that measures the magnitude of the output voltage of the DC voltage conversion unit,
    The blow-off detection unit calculates an increase value from a reference value that is an output voltage of the DC voltage conversion unit when there is no blow-off, and detects the blow-off when the increase value is larger than a predetermined increase value. An induction heating cooker that outputs that the control unit has been blown down.
  2. 　前記吹き零れ検知部は、前記加熱出力値を前記設定出力値から前記設定出力値より小さい第２設定出力値へ変更するとともに、当該変更前の前記直流電圧変換部の出力電圧の当該変更後の前記直流電圧変換部の出力電圧に対する差が、第１所定低下値より大きいとき、吹き零れを検知することを特徴とする請求項１記載の誘導加熱調理器。 The blown-down detection unit changes the heating output value from the set output value to a second set output value smaller than the set output value, and after the change of the output voltage of the DC voltage conversion unit before the change The induction heating cooker according to claim 1, wherein when the difference with respect to the output voltage of the DC voltage converter is larger than a first predetermined drop value, the blow-off is detected.
  3. 　前記吹き零れ検知部は、前記上昇値が前記所定上昇値より大きくなってから第１所定待機時間が経過後、前記加熱出力値を前記第２設定出力値に変更することを特徴とする請求項２記載の誘導加熱調理器。 The blown-down detection unit changes the heating output value to the second set output value after a first predetermined waiting time has elapsed since the increase value is greater than the predetermined increase value. 2. The induction heating cooker according to 2.
  4. 　前記吹き零れ検知部は、前記直流電圧変換部の出力電圧の前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値に対する差が、第２所定低下値より大きいとき、吹き零れを検知することを特徴とする請求項３記載の誘導加熱調理器。 When the difference between the output voltage of the DC voltage conversion unit and the maximum value of the output voltage of the DC voltage conversion unit during the elapse of the first predetermined standby time is greater than a second predetermined decrease value, The induction heating cooker according to claim 3, wherein blown down is detected.
  5. 　前記吹き零れ検知部は、前記加熱出力値を前記第２設定出力値に変更してからの第２所定待機時間が経過後、当該変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過後の前記直流電圧変換部の出力電圧に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知することを特徴とする請求項２又は３記載の誘導加熱調理器。 After the second predetermined standby time has elapsed since the heating output value was changed to the second set output value, the blown spill detector detects the second predetermined output voltage of the DC voltage converter before the change. The induction heating cooker according to claim 2 or 3, wherein when the difference with respect to the output voltage of the DC voltage converter after the standby time has elapsed is greater than the second predetermined decrease value, blown-off is detected.
  6. 　前記吹き零れ検知部は、前記第２設定出力値に変更前の前記直流電圧変換部の出力電圧の前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値より大きいとき、吹き零れを検知することを特徴とする請求項５記載の誘導加熱調理器。 The blown-off detector has a difference between the output voltage of the DC voltage converter before the change to the second set output value and the minimum value of the output voltage of the DC voltage converter during the second predetermined waiting time. 6. The induction heating cooker according to claim 5, wherein when it is larger than the second predetermined lowering value, blown down is detected.
  7. 　前記吹き零れ検知部は、前記第１所定待機時間が経過中の前記直流電圧変換部の出力電圧の最大値と、前記第２所定待機時間が経過中の前記直流電圧変換部の出力電圧の最小値に対する差が、前記第２所定低下値よりも大きいとき、吹き零れを検知することを特徴とする請求項３記載の誘導加熱調理器。 The blown-down detection unit is configured to output a maximum value of the output voltage of the DC voltage conversion unit during the first predetermined standby time and a minimum value of the output voltage of the DC voltage conversion unit during the second predetermined standby time. The induction heating cooker according to claim 3, wherein when the difference with respect to the value is larger than the second predetermined lowering value, the blow-off is detected.
  8. 　前記吹き零れ検知部は、前記基準値の前記直流電圧変換部の出力電圧に対する差が、第３所定低下値より大きいとき、吹き零れを検知することを特徴とする請求項１記載の誘導加熱調理器。 2. The induction heating cooking according to claim 1, wherein when the difference between the reference value and the output voltage of the DC voltage conversion unit is larger than a third predetermined decrease value, the blown-down detection unit detects blown-down cooking. vessel.
  9. 　前記制御部は、前記加熱出力値が前記設定出力値となっているときに、前記吹き零れ検知部からの吹き零れ検知の出力を受けると、前記加熱出力値を前記第２設定出力値より小さい第３設定出力値に低下するか、もしくは、加熱を停止することを特徴とする請求項２又は３記載の誘導加熱調理器。 When the control unit receives an output of blown-down detection from the blown-down detection unit when the heating output value is the set output value, the heating output value is smaller than the second set output value. 4. The induction heating cooker according to claim 2, wherein the induction heating cooker decreases to a third set output value or stops heating.
  10. 　前記吹き零れ検知部は、前記直流電圧変換部の出力電圧の第３所定待機時間内の変化値が所定の出力電圧範囲以内である場合に、間欠的に測定した前記直流電圧変換部の出力電圧を前記基準値に置き換えることを特徴とする請求項１から９のうちいずれか１つに記載の誘導加熱調理器。 The blown-off detection unit is configured to intermittently measure the output voltage of the DC voltage conversion unit when a change value of the output voltage of the DC voltage conversion unit within a third predetermined standby time is within a predetermined output voltage range. The induction heating cooker according to any one of claims 1 to 9, wherein is replaced with the reference value.
PCT/JP2011/003303 2010-06-10 2011-06-10 Induction cooking device WO2011155217A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007141541A (en) * 2005-11-16 2007-06-07 Matsushita Electric Ind Co Ltd Cooker
JP2008159494A (en) * 2006-12-26 2008-07-10 Mitsubishi Electric Corp Induction cooker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007141541A (en) * 2005-11-16 2007-06-07 Matsushita Electric Ind Co Ltd Cooker
JP2008159494A (en) * 2006-12-26 2008-07-10 Mitsubishi Electric Corp Induction cooker

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