JPS60151990A - Induction heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an induction heating (lambda) cooker which generates a high frequency IIJ field from a heating coil and applies it to the load to induce induction heating of the load. Open to.

[Technical background of the invention]

Generally, in this type of induction IJO heat cooker, a humidity sensor is installed on the surface of the top brake 1- (on the heating coil side) on which the load, that is, the pot is placed, and the temperature detected by this sensor is Compare the temperature of the pot with the set temperature of the temperature setting part in the operation section, and if the humidity of the pot approaches the set temperature, reduce the output, and if the temperature of the steel exceeds the set temperature, turn off the heating. 17 stop-U ff! There is a device that keeps the temperature of A at an appropriate temperature close to the set temperature.

[Problems with back q technique 1fi] However, it is difficult for the user to judge whether the scale (of the saw) is suitable or not.
Even though he was competent, there were times when he ended up cooking one poorly. For example, when cooking tempura, even if the oil in the pot is at the appropriate temperature, adding too much ingredients will cause the oil temperature to drop, which will have a negative effect on the quality of the frying.

[Purpose of the invention]

This invention was made in view of the above circumstances,
The purpose of this is to accurately notify the usage name whether the load temperature is appropriate (appropriate) or not.
To provide an excellent induction heating cooker that enables cooking with consistently good results.

[Overview of Hikari]

This light is equipped with a determination means for determining whether the difference between the detected temperature of the temperature detector that detects the load temperature and the set temperature of the temperature setting unit that sets the load temperature is within a certain range. (
) and a means for notifying whether or not the judgment result of the judgment means, that is, the humidity of the steel, is suitable.

[Embodiments of the invention]

1'J, below, an example of this light-filled plant will be explained with reference to the drawings.

In FIG. 1, 1 is the main body of the induction heating cooker, and top plates 1 and 3 on which a load, that is, a pot 2 is placed, are provided on the top surface of the main body 1. is 5
11, a temperature indicator 4, an output/set temperature indicator 5, a heating mode indicator 6, and a suitable temperature indicator 7 are provided. Furthermore, an output/temperature setting volume 8, which is a component of the temperature setting section, is provided on the side of the main body 1, and a heating mode changeover switch 9 is also provided. A thermistor Rt, which will be described later, is attached to the.

FIG. 2 shows the control circuit. 10 is a thermistor circuit, which detects the temperature of the pot; for example, a thermistor Rt;
Consisting of resistors Ra, R11, and Rc, top play 1~
It outputs a voltage V (of a level corresponding to the temperature of the pot placed on the pot 3). '11 is a correction circuit, and a resistor Rd
, Re series circuit and human resistance Rf, R1+, feedback resistance R
1, and an amplifier circuit consisting of an output amplifier 1iii'12, which converts the output voltage Vt of the thermistor circuit 10 into an appropriate voltage and outputs it. 13 is a subtraction circuit, which includes input resistances Ri, Ri, grounding resistance Rj, and summation resistance Rj.

Consisting of an operational amplifier 14, the output voltage VC of the correction circuit 11
It outputs a voltage VO corresponding to the difference between the output voltage VS of the temperature setting section 13, and the output voltage VS of the temperature setting section 13, which will be described later.

15 is a humidity setting section, which includes resistors R1, Rm, and Rn.

It consists of the ROJ 3 and the output horn/humidity setting volume 8, and outputs a voltage VS corresponding to the temperature set by the operation 1' of the volume 8 and a minimum value vsmin of the voltage Vs. Therefore, the output Vs of the temperature setting section 13
is supplied to the subtraction circuit 13 via the Portyschiff A lower (gain is 1) 1G. Also, the output Vsn+in of the :U 19B2 constant part 15 is the inverting input terminal (-
), and the non-inverting input terminal (+) of this comparator 17 is supplied with one output Vo of the reduction circuit 13.

In addition, 18 is a suitable) product display circuit, and the maximum reference voltage V dm
ax'j i! 7 Resistance R++, Rq, minimum reference voltage V [lTl1 t Resistance R to set It 1!7
r, Rs, a comparator 19 that compares the maximum ml voltage Vd nl a X and the J voltage Vo output from the reduction circuit 13, a comparator 20 that compares the minimum base \=gastric pressure Vdm1n and the voltage vO
．． N1) N-type transistor 21, this transistor 21
Resistors Ru, RV, Rv, h supply driving voltages to the comparator 19. ', 20
The diodes DI, D2. ! ~
It consists of a resistor Rx that supplies voltage to the suitable temperature indicator lamp (light emitting diode) 7 together with a transistor 21, and is used to determine whether the output voltage vO of the subtraction circuit 13, that is, the difference between the temperature of the pot and the set temperature is within a certain range. A determination is made, and the drive control of the appropriate temperature display lamp 7 is performed in accordance with the determination result.

Therefore, the output VO of the subtraction circuit 13 is transmitted to the temperature adjustment side terminal 9a of the heating mode switching switch 9 via a voltage suppression circuit 22 consisting of a resistor Rk and a Zener diode ZD.
supplied to However, the output terminal of the comparator 17 is connected to the output terminal of the voltage suppression circuit 22, and the subtraction circuit 1
The output voltage VO of 3 is the minimum output voltage ■S of the temperature setting section 15
The output voltage of the voltage suppressing circuit 22 is set to zero potential when the voltage is below m1l+. Further, the output voltage Vs of the Porty Schiff A lower 1G is supplied to the output adjustment side terminal 9b of the heating mode changeover switch 9. And, heating mode changeover switch 9 is possible! The Ill output vrer is supplied to the non-inverting input terminal (+) of the comparator 23, and the output of the sawtooth wave oscillation circuit 24 is supplied to the inverting input terminal (-) of the comparator 23. That is, the output of the sawtooth wave oscillation circuit 24 is changed in pulse width jl (PWM) by the output \/1''at of the heating mode changeover switch 9.The output of the comparator 23 is used to drive the heating coil. The heating coil drive circuit 25 controls the heating coil 26 and the switching element A and OFF control υU according to the ratio V and the pulse number 15 output from the device 23. A resonant circuit consisting of a capacitor (not shown) is driven to oscillate to flow an 8-frequency current through the heating coil 2Gi.

At this point, the operation will be explained in the above-mentioned configuration (1).

First, ':j' = 3 Referring to DJ Jj and Figure 4, set -C.

The output voltage Vt of Lee Misk circuit 2B 10 is the resistance Ra,
If i or It and Rc are set appropriately, Vt = A・T I
I can draw the near-old linear relationship of 10B by 1.

Here, /\a> J, B are constants, and -nl is the detected temperature, that is, the temperature of the pot. When this output pressure V is applied to the correction circuit 11, the output voltage VC of the correction circuit 11 is , Vc = (1+R(] /Rr) Vt - RlJ
/Rf ・Ito becomes. Here, Vl) is the power supply voltage VCC and the resistance Rd
By changing the value, the value of Vc can be balanced (hyperactivity is possible) as shown by the two-point chain in the diagram and the arrow.
The output voltage VS of the temperature setting section 15 is set δ1 so as to have a linearity of Vs = c - Ts + D considering its 4f% productivity. Here, TS is the set temperature.

C and D are constants ゛C.

In addition, the temperature V, setting part 1 is
The output voltage Vs of 5 is not affected by the human input impedance of the subsequent circuit.

Therefore, the output voltage VC of the correction circuit 11 and the output voltage VS of the temperature setting circuit 15 are supplied to the cylinder reduction circuit 13, and the voltage VO corresponding to the difference between V'C and VS is output from the cylinder reduction circuit 13. . The output pressure VO is Vo = Rj / Ri (Vs - Vc) · River Sj
, 'Ri rc'-'rs +D (1+Ru+t [
> vt −+*< 9, −' Rr ・Vb)=R
j , 'Ri (C-rs +[11-<1+R111
, 'Rf) (A-Tm 10B> +RQ /Rf・
vl)) =Rj,%Ri (C-Ts-(1+Rg/R'
)Δ′Tl1l +D )[J /RI −Vb −(
14-RU i Rr ) B]. niC, C-, (i +R!J,' I or f)
A How do you choose R7'R[?

Vo = -Rj,, Rr (C(1-s-Tm) +
D+R1J'Rf -Vb -(1+lmaLJ/[)[
3), and Vo has a linear relationship with the difference (Ts −1−m ) between the setting) quality TS and the detection) B degree Tm.

Vo == [(Ts - Tm) 10F here F,' E
-Rj, /R1-C1F=Rj,'Ri(D-;-R
lJ /Rf -Vwa - (1+RD,'Rr B
) is a constant.

By selecting the bean paste of ,,F for V O,l, when the detected temperature Tn+ or the set temperature Ts is reached, that is, (TS
'-Tlll ) = O, then it becomes ". Set the range above and below ", and if VO is in this range, then (Ts
-Tn+) within the corresponding range.

If the range is determined so that this area has an appropriate temperature, the appropriate temperature display lamp 7 can be turned on by the appropriate humidity display circuit 18 when VO is in that area.

FIG. 4 illustrates this.

The operation of the appropriate humidity display circuit 18 will now be described with reference to FIG. Mari゛, (Daichi temperature T111 is ε): Ro degree T
Lower than s and ■ region, that is 3Q; if it is not a crystal region,
The output voltage vO of the subtraction circuit 13 becomes higher than the input voltage 'J' (l lit a The transistor 21 is A] and suitable) the crystal display lamp 7.
does not light up. Next, the detected temperature T m and the constant temperature T
s is in the appropriate temperature range, the output voltage Vo of the camphor reduction circuit 13 becomes lower than the input voltage Vdmax at the non-inverting input terminal (+) of one comparator 20. (-) becomes higher than the input voltage V 11 III i l'l of the comparator 19. ．． The outputs of 20 are both logical ゛1
゛Roar. At J:, transistor 21 turns on, and 3+
2) Point 7 on the crystal display. Furthermore, if the detected temperature 7 +n is higher than the temperature T 3 and there is no region (■), that is, an appropriate humidity region C, the output voltage VO of the evaporation circuit 13 is equal to the input voltage Vdm1 at the inverted pano j end (-) of the comparison Li 20.
n, and the output of the comparator 20 is logic "o".
bawl. J: So, transistors 1 to 21 are turned on, but temperature indicator lamp 7 does not light up.

I wanted to do this, so I turned the heating mode selector switch 9 to humidity = 1 side t; Which difference in Ts corresponds to the voltage vO? outputted from the loop circuit 13,
It is extracted by heating E-1 to switching switch 9 and V
l・e [sound, that voltage V ref J: ri comparator 2
3, pulse width modulation is performed 11, and the output-C heating coil 2G is operated according to the temperature difference. In this case, due to the presence of the comparator 17 at δ22 J3 in the voltage suppression circuit, the voltage Vref changes between the predetermined maximum IU Vrc4max and minimum value V rermin (-V smi++),
13, the heating coil 26 is moved 1'l/J to maintain the temperature of the pot at an appropriate temperature. And shown in Figure 5!
When cooking sea urchin, for example, tempura, if the oil in the river is at an appropriate temperature, the appropriate temperature indicator lamp 7 will light up, allowing the user to easily know when to add ingredients. Also, if the oil in the pot drops and is no longer at the appropriate temperature when adding 8 In, the light will go out and the user will not be able to use it any more. 1) I can easily sense when my condition is getting worse.

Therefore, good cooking can be performed at all times.

In addition, when cooking while keeping warm, a practical person can easily detect that the product is kept warm, and reliability can be improved.

In the above embodiment, a discrete analog circuit is used, but a microcomputer may be used instead of the one shown in FIG. That is,
In this case, → the output Vt of the no mister circuit 10, the output of the temperature setting circuit 15) JVS, the maximum reference voltage V dmax, and the minimum reference voltage Vdm1n for appropriate temperature display control are converted into A, -'D (above log/' digital), respectively. Vessel 31
convert it into a digital signal and send it to the macro computer 3.
IRL to 2. Technique 10: The microcomputer 32 detects the difference between the temperature of 7 m and the set temperature TS, and converts the analog signal corresponding to the result to a D/A ′Anorok)
-1 is output from the converter 33 and supplied to the non-inverting input terminal (+) of the comparator 23. Also, the temperature difference produced by the microcomputer 2 is the reference voltage V dllaX, ', / (lHli
11 constant L of whether it is within a certain range based on ll
I-j Jj, the appropriate humidity will be displayed according to this judgment result]・
17 companies, Sudo 6j control? T Now J, I'm making sea urchins.

Ma/j, the above implementation i! ``C uses a light emitting diode (Δ-1) as a suitable temperature alarm, and by turning on and off the light diode, it is made to notify whether it is C or Jj crystal. For example, by changing the light color of 'A-1~ with a light source, it may be possible to notify whether there is +'l + Chang-C.Furthermore, The appropriate temperature alarm is not limited to the optical tie A-1, but may also be a buzzer, a sound generator α, or the like.

However, it goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various modifications can be made without changing the gist.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to accurately inform the user whether or not the temperature of the negative section is at an appropriate temperature. We offer an excellent induction heating cooker that allows you to cook food with good results.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is an external perspective view, Fig. 2 is a combination diagram of the control V11 circuit, and Figs. 3 and 4 are the same as Fig. 2. Figure 5 is a diagram for explaining the operation of each part. Figure 5 is a diagram showing an example of cooking opening 1 for guests. Figure 6 is a diagram showing an example of the operation of cooking port 1 for guests. Figure 6 is an example of the same implementation. It is a configuration diagram of the circuit. 1... Main body, 2... Pan (load), 3... 1-Tububurei 1-17... Appropriate temperature display lamp, 8... Output 5
・'Temperature setting volume, 10...Thermistor times f+
1', RL...1 no mister (temperature detector), 11.
... Correction circuit, '13 ... Subtraction circuit, 15 ... Temperature setting section, 18 ... Appropriate temperature display circuit, 2G ... Heating coil. Single agent patent attorney ♀1) Etakehiko Figure 1 Figure 30 (Ts-Tm) - Figure 5

Claims (1)

[Claims] In an induction heating cooker that generates a high-frequency magnetic field from a heating coil and applies it to the load to inductively heat the load, there is a temperature setting section that sets the temperature of the load, and a temperature detector that detects the temperature of the load. and a means for controlling the heating output according to the difference between the temperature detected by the temperature detector and the set temperature of the temperature setting section;
A determining means for determining whether the set temperature difference/'J'X of the temperature setting section is within a certain range, and a notifying means for notifying the determination result of this determining means are provided. i'L
'(Dosuru induction heating cooker.