JPH05326124A - Induction heatiang cooker - Google Patents

Abstract

PURPOSE:To improve usability by displaying a heating output value and an output setting value concurrently on the same display apparatus. CONSTITUTION:An input current is detected by an input current detection circuit 7, the input voltage of a commercial power source 1 or an inverter circuit 11 is detected by a power source voltage detection circuit 8, and both detected values are inputted in a control apparatus 9 to conduct calculation, obtaining a heating output value. Thus the apparatus 9 is controlled so that an output setting value and a heating output value can be alternately displayed on a display apparatus 10. Consequently thermal power can be easily adjusted while watching display, allowing the improvement of usability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to induction heating cooking in which an eddy current is generated in a metal to be heated by an electromagnetic induction action by an alternating magnetic flux and the cooking is performed by Joule heat due to the specific resistance of the metal, and the heating output is displayed. It is related to vessels.

[0002]

2. Description of the Related Art An induction heating cooker that applies a high-frequency current to a heating coil to generate a high-frequency magnetic flux to induce an eddy current in a load magnetically coupled to the heating coil and heat the load by its Joule heat is generally used. Specifically, the output set value is displayed on the position of the output adjusting volume or the display device as shown in FIG.

However, in the induction heating cooker, the actual heating output state varies depending on the material, shape, size or voltage variation of the pot. For example, the same output set value is now "1".
Even if set to 0 ", the standard pot and the pot with no output have different heating output states. In other words, the display device does not show the heating power accurately, so the user had difficulty adjusting the heating power. ..

Therefore, conventionally, in order to solve this problem, a voltage detecting circuit and a current detecting circuit are provided as in Japanese Patent Laid-Open No. 3-81987, each detected value is calculated, a heating output value is obtained, and the calculated value is obtained. The method of outputting to the display device was used. Further, as in Japanese Utility Model Laid-Open No. 62-140693, two display devices are provided, one for displaying an output set value and the other for displaying an actual heating output value.

[0005]

However, in the former conventional example, in the case of a pot with no output, even if the output setting is maximized, all the display devices are not lit, which causes confusion for the user. There is a risk. In addition, the latter conventional example is complicated because two display devices are provided, and the cost is increased. Therefore, an object of the present invention is to realize a method that allows a user to easily visually judge the heating state without increasing the cost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and detects an inverter circuit, an input current detection circuit for detecting an input current, a commercial power supply voltage or an inverter circuit input voltage. A power supply voltage detection circuit, a display device for displaying the heating state of the load, and a control device for controlling the entire product such as transmission control of the inverter circuit and control of the display device, and the input current detection circuit and the power supply. Input both detection values of the voltage detection circuit to the control device,
The calculation to obtain the heating output value is performed, and the heating output value and the output setting value for setting the input power by the control device are simultaneously displayed on the display device.The display method of the display device is to display the output setting value and the heating output value. The same display device is alternately displayed, or the value corresponding to the heating output value is blinked with respect to the output set value.

[0007]

With the above configuration, the input current detection circuit detects the input current, the power supply voltage detection circuit detects the commercial power supply voltage or the input voltage of the inverter circuit, and the control device detects both detection values. The calculation is performed to obtain the heating output value by inputting, and the display device simultaneously displays the heating output value and the output set value with which the control device sets the input power. As the display method, the output set value and the heating output value are alternately displayed on the same display device, or the value corresponding to the heating output value with respect to the output set value is displayed in blinking.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a block circuit diagram of an induction heating cooker according to an embodiment of the present invention, FIG. 2 is a display example of the same display device, and FIG. 3 is a standard pot and a pot without output. It is a graph which shows an output set value and a heating output value.

In the figure, 1 is a commercial power source, and 11 is a rectifying circuit 2 for rectifying the commercial power source 1, a smoothing circuit 3 for smoothing the output of the rectifying circuit 2 into a direct current, a heating coil 4, a resonant capacitor 5, and an antiparallel diode. Switching element 6 having
7 is an input current detection circuit for detecting an input current by a current transformer (not shown), and 8 is a power supply voltage detection circuit for detecting an input voltage of the commercial power supply 1 or the inverter circuit 11. , 9 is a control device for controlling the entire product, and 10 is a display device for displaying the output set value and the heating output value set by the heating output setting means (not shown).

The operation of the above embodiment will be described below. Calculation of detecting the input current by the input current detection circuit 7, detecting the input voltage of the commercial power supply 1 or the inverter circuit 11 by the power supply voltage detection circuit 8, and inputting both detected values to the control device 9 to obtain the heating output value. I do. As shown in FIG. 3, when the standard pan D is used, the output set value and the heating output value are the same, but when the pan E that does not output is used, the heating output value is lower than the output set value. Become.

Hereinafter, a display method of the display device 10 when the pan E which does not output output is heated will be described. Set the output setting to "1"
If it is set to "0", the control device 9 causes the display device 10 to display the output set value "10" (FIG. 2A). The heating output value obtained by the calculation by the control device 9 is "10" as apparent from FIG. 8 ". Next, the control device 9 causes the display device 10 to display the heating output value" 8 "at a certain interval (FIG. 2B). After that, the control device 9 outputs the heating output value" 10 "and the heating output value. The display device 10 is controlled to alternately display the value "8." Therefore, the heating power can be easily adjusted while observing the display, and the induction heating cooker is easy to use.

As shown in FIG. 2C, L from 1 to 10
Setting output value "10" is displayed by turning on ED, and heating output value "8" is displayed by blinking only LED8. When the output setting value and heating output value are the same, the heating output value The blinking display may be stopped.

[0013]

According to the present invention, since the calculation for obtaining the heating output value is performed and the heating output value and the output set value for setting the input power by the control device are simultaneously displayed on the same display device,
It is possible to easily adjust the heating power while observing the display, and to provide an easy-to-use induction heating cooker.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an induction heating cooker showing an embodiment of the present invention.

FIG. 2 is also a display example of the display device.

FIG. 3 is a graph showing an output set value and a heating output value in a standard pan and a pan with no output.

[Explanation of symbols]

 1 Commercial Power Supply 2 Rectifier Circuit 3 Smoothing Circuit 4 Heating Coil 5 Resonant Capacitor 6 Switching Element 7 Input Current Detection Circuit 8 Power Supply Voltage Detection Circuit 9 Control Device 10 Display Device 11 Inverter Circuit

Claims (5)

[Claims] 1. A rectifier circuit (2) for rectifying a commercial power source (1), a smoothing circuit (3) for smoothing an output after rectification to obtain a DC voltage, and a heating coil (4) for converting the DC voltage into an AC voltage. ), A resonance capacitor (5), an inverter circuit (11) including a switching element (6), an input current detection circuit (7) for detecting an input current, and a power supply voltage detection circuit (8) for detecting a power supply voltage. And a display device (10) for displaying the heating state of the load, and a control device (9) for controlling the entire product such as transmission control of the inverter circuit (11) and control of the display device (10), The detection values of both the input current detection circuit (7) and the power supply voltage detection circuit (8) are input to the control device (9) to perform a calculation to obtain a heating output value, and the heating output value and the control device (9). The output set value for setting the input power by the display device ( An induction heating cooker characterized by being displayed simultaneously in 10). 2. The induction heating cooker according to claim 1, wherein the display device (10) displays the output set value and the heating output value alternately on the same display device (10). 3. The display method of the display device (10) is such that the output set value is lit and displayed on the same display device (10) and a value corresponding to the heating output value is displayed in blinking on the output set value. The induction heating cooker according to claim 1. 4. The induction heating cooker according to claim 2, which is a power supply voltage detection circuit (8) for detecting an input voltage of the commercial power supply (1). 5. The induction heating cooker according to claim 2 or 3, which is a power supply voltage detection circuit (8) for detecting an input voltage of the inverter circuit (11).