KR980007850A - Apparatus and Method for Determining Cooking Vessel Material of Induction Heating Cooker - Google Patents

Abstract

The present invention relates to a cooking vessel material determination device and method of an induction heating cooker, and conventionally to produce a joule heat in a magnetic container by supplying an induction current to the heating coil by a frequency conversion (20 ~ 30KHz) only for the magnetic container In case of magnetic container, there is no problem. However, in case of non-magnetic container, which has low resistivity, permeability, and surface resistance compared to magnetic container, the induction heating is properly performed because the number of turns of working coil has to be increased and heated at high frequency (70KHz). There is a problem that can not be.

Accordingly, the present invention is capable of accurately determining not only magnetic containers but also non-magnetic containers in a short time by detecting a voltage appearing at an AC input power source after generating an arbitrary container material determination frequency during driving. In addition, two working coils can be installed to operate both working coils according to the nonmagnetic mode or the magnetic mode, or only one working coil can be operated so that the optimum power can be selected according to the determined container so that high efficiency can be expected. Make sure

Description

Apparatus and Method for Determining Cooking Vessel Material of Induction Heating Cooker

As this is a public information case, the full text was not included.

2 is a block diagram of a cooking vessel material plate device of the present invention induction cooker.

3 is a detailed circuit diagram of the AC input line current detector side detector in FIG.

4 is a table showing output voltage (a point) for each container in FIG.

Figure 5 is a flow chart for the cooking vessel material determination method of the present invention induction cooker.

Claims (6)

The electronic cooker includes a rectifying means for rectifying the input AC power source, a working coil for heating the cooking vessel, an inverter unit providing a resonance voltage to the working coil, and a switching drive unit for controlling a switching control signal of the inverter unit. In one embodiment, the switching coil is configured by connecting two working coils for heating the magnetic and non-magnetic containers in series, and selecting all of the working coils to operate only when the working coils are nonmagnetic containers and only one working coil when the magnetic coils are operated. Container material determining means for receiving a voltage through the current detector for the amount of current flowing to the AC input power after heating the working coil, and cooking vessel to determine the material of the container by looking up the voltage received from the container material determining means A cooking vessel material determining apparatus of an induction heating cooker, characterized in that it comprises a judging means. The cooking vessel judging means of claim 1, further comprising: current / voltage converting means for converting a current received from the current detector into a voltage corresponding thereto; First rectifying means for rectifying the voltage provided from said current / voltage converting means to remove unnecessary portions; Voltage dividing means for dividing the DC voltage provided from the first rectifying means by using a resistor; And a comparing means for comparing the output voltage of the first rectifying means with a reference voltage set by a variable resistor in advance. 3. The operational means according to claim 2, wherein the comparing means receives and compares and amplifies a sensing voltage of the hysteresis AC power as a non-inverting input terminal, receives a voltage fed back through the inverting terminal thereof, and a reference voltage divided by a variable resistor. Means; A photocoupler for transferring the output voltage of the operational amplification means to a control means; Device for determining the cooking vessel material of the induction cooking cooker characterized in that the transistor is configured to control the operation of the photocoupler is turned on or off in accordance with the output voltage of the operational amplifier means. A first step of generating an arbitrary vessel determination driving frequency upon selecting a heating start key and reading a voltage proportional to the amount of current flowing in an input AC power source after turning on a relay switch; A second step of comparing the voltage Va read in the first step with a voltage stored in a preset tuk-up table; And a third step of heating in a mode according to the determined result after determining the magnetic container and the non-magnetic container as compared in the second step. 5. The method of claim 4, wherein the vessel determination driving frequency has a median value rather than a frequency band for heating the magnetic and nonmagnetic vessels. 5. The method of claim 4, wherein the determination of the cooking vessel in the third step comprises: a first step of determining as a triple bottom container or an aluminum container when the voltage read from the input AC power is 1.0 V or less; A second step of checking whether the voltage exists between 1.5 V and 2.5 V when the first step is 1.0 V or more; In the second process, if present between 1.5V ~ 2.5V is determined as a 430 container or flooded container, and if present between 1.5V ~ 2.5V and more than 2.7V characterized in that the third process to determine the pot Method of judging the cooking vessel material of an induction heating cooker.