KR0138637B1 - Container detecting device of compound cooker and its sensing method - Google Patents

Abstract

The present invention relates to a vessel sensing device and a vessel sensing method for a complex cooker having a combined function of a microwave oven and an induction heating cooker, and rectifying means for receiving a commercial AC input voltage output from the AC power input terminal and performing full-wave rectification with DC. And a microcomputer for receiving a DC voltage output from the rectifying means and outputting a synchronous control signal for controlling the overall operation of the vessel sensing device, and a microwave or induction heating cooker for receiving a synchronous control signal output from the microcomputer. A relay driving means for outputting a driving contact signal for selecting an operation of the cooking apparatus; a cooking means for receiving a driving contact signal output from the relay driving means and performing cooking functions of induction and microwave oven; and cooking output from the cooking means. At the same time as receiving the operation signal A switching means for receiving a synchronous control signal output from a chromocomputer and outputting a switching signal for driving a load, and receiving a switching signal output from the switching means to sense a variation in the current flowing in the container and the microcomputer Characterized in that the current sensing means for output to.

Description

Container detecting device of compound cooker and its sensing method

1 is a control block diagram of a conventional microwave oven.

2 is a control block diagram of a conventional induction cooker.

3 is a control block diagram of a container detecting device of a composite cooker according to an embodiment of the present invention.

Figure 4 is a detailed circuit diagram of the container detecting device of a composite cooker according to an embodiment of the present invention.

5 is a flowchart showing an operation procedure according to the present invention.

* Explanation of symbols for main parts of the drawings

10: rectification means 20: microcomputer

30: relay driving means 31, 32: first and second relay driving means

40: relay means 50: cooking means

51: induction means 52: microwave oven means

60: switching means 70: current sensing means

80: cooking selection means

The present invention relates to a vessel sensing device and a vessel sensing method for a complex cooker having a combined function of a microwave oven and an induction heating cooker.

In general, a conventional cooker has used a separate product of a separate concept of a microwave oven (Micro Wave Oven) and an induction heating cooker (Induction).

First, as shown in FIG. 1, the conventional microwave oven includes a microcomputer 1, key input means 6 for inputting data necessary for the operation of the microwave oven to the microcomputer 1, Power supply means (2) for full-wave rectifying the power supply voltage and inverting the full-wave rectified DC voltage and then raising the power supply voltage to a constant voltage by mutual induction of the transformer, and receiving a voltage through the transformer of the power supply means (2) An oscillation means (7) for driving to generate ultra-high frequency necessary for cooking, first comparison means (3) for discriminating whether or not a voltage induced on the transformer primary side of the power supply means (2) is high voltage, and the oscillation means A second comparing means (4) for determining the output value of (7), and a switching means (5) connected or disconnected under the control of the microcomputer (1) in accordance with the output value of the second comparing means (4). have.

However, in such a configuration, since the container used in the cavity of the microwave oven cannot be automatically sensed, it is not possible to perform a cooking function suitable for the characteristics of the container, and to use a container without a container or a container that is not a proper container. In this case, the switching element is destroyed, and it is difficult to guarantee the performance and safety of the device.

In addition, since the cooking function of the microwave is limited, there is a problem that it is difficult to meet various cooking needs of the user.

In addition, as shown in FIG. 2, the conventional induction heating cooker has a current transformer 92 which detects a change amount of the current input to the load 91 and a change amount of the current detected by the current transformer 92. FIG. A voltage variation amplification means 94 for receiving and amplifying the voltage variation by a voltage variation, a voltage variation detection means 96 for measuring a variation in an input voltage detected by a transformer disposed at a power input terminal, and a reference corresponding to a rated voltage A reference voltage Verf inputted from the reference voltage adjusting means 95 to the reference voltage adjusting means 95 for applying a voltage, the voltage variation amount of the voltage change amplifying means 94 and the voltage variation detecting means 96; A pulse for modulating the pulse width by comparing the output voltage adjusting means 97 for comparing and amplifying the difference, and the sawtooth wave signal input from the saw tooth generating means 99 by receiving the output signal of the output voltage adjusting means 97; In accordance with a signal outputted from modulating means (98) and said pulse width modulation means (98) consists of a load driving means 100 for driving the load (91).

However, in such a configuration, since the container used for the induction heating cooker cannot be automatically sensed, not only a cooking function suitable for the characteristics of the container can be performed, but also the cooking function of the product is limited. There was a problem that it is difficult to meet various cooking needs.

In addition, when the induction heating cooker is operated at a resonant frequency during the initial operation of the induction cooker, or when the induction cooker is operated without using a container or using a container other than a proper container, an excessive current flows to the switching element. It is difficult to ensure the performance and safety of the device due to the destruction of the device, and also has a problem that the stable cooking state cannot be maintained because the oscillation frequency is lowered below the audible frequency.

In addition, in the separate use method of the microwave oven and the induction heating cooker as described above, each product is purchased separately and uses the cooking characteristics suitable for the cooker, thus occupying a lot of space in a modern home that seeks to simplify the kitchen space. Not only that, but also because the two products must be purchased at the same time there was a problem that the cost increases.

Accordingly, the present invention has been made to solve various problems of the related art as described above, and an object of the present invention is to select a function of a microwave oven or an induction heating cooker by supervising a current flowing in a container using a current sensing means. Therefore, the present invention provides a container detecting device for a complex cooker having a simple configuration and low cost, and a container detecting method thereof.

It is another object of the present invention to provide a container detecting device and a container detecting method of a compound cooker which can operate in parallel as well as operate the functions of a microwave oven and an induction heating cooker using a microcomputer and a relay means. It is.

In order to achieve the above object, the container detecting apparatus of the complex cooker according to the present invention is provided with rectifying means for full-wave rectification by receiving a commercially-regulated input voltage output from an AC power input terminal, and receiving the DC voltage output from the rectifying means. A microcomputer for outputting a synchronous control signal for controlling the overall operation of the sensing device, and a relay drive for outputting a driving contact signal for selecting an operation of a microwave oven or an induction heating cooker by receiving the synchronous control signal output from the microcomputer Means, a cooking means for receiving a driving contact signal output from the relay driving means and performing a cooking function of an induction and microwave oven, and a synchronization signal output from the microcomputer at the same time as receiving a cooking operation signal output from the cooking means; Receiving control signals Switching means for outputting a switching signal for driving the lower, and current sensing means for detecting the amount of change in the current flowing through the container receiving the switching signal output from the switching means for outputting the microcomputer do.

In addition, the container detecting method of the multi-cooker according to the present invention comprises a cooking means discrimination step for determining whether the selection mode of the cooking means desired by the user by the cooking selection means is input to the microcomputer, and the cooking determined in the cooking means discrimination step If the selection mode of the selection means is not input to the microcomputer, the current detection step of detecting the amount of change of the current flowing through the container by the current detection means while performing the induction means and the cooking mode, and the current detection means in the current detection step. The maximum voltage judging step of judging whether the detected voltage value V is greater than the maximum voltage value X preset in the microcomputer, and the voltage value V determined in the maximum voltage judging step is the maximum voltage. If not larger than the value X, the voltage value V detected by the current sensing means is set in advance in the microcomputer. The minimum voltage judging step for judging whether it is smaller than the minimum voltage value Y, and the voltage sensed by the current sensing means when the voltage value V determined in the minimum voltage judging step is not smaller than the minimum voltage value Y. An induction driving step operating in induction means and cooking mode while determining whether the value V is greater than the minimum voltage value Y preset in the microcomputer and smaller than the maximum voltage value X, and the minimum voltage discrimination step If the voltage value (V) determined in step 2 is smaller than the minimum voltage value (Y), the microwave driving step operating in the cooking mode of the microwave oven means while determining whether the door of the multicooker is closed, and in the cooking means discrimination step, When the selection mode of the determined cooking selection means is input to the microcomputer, it is characterized in that the selection mode driving step of performing the selected cooking mode.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a control block diagram of a container detecting device of a composite cooker according to an embodiment of the present invention, Figure 4 is a detailed circuit diagram of the container detecting device of a compound cooker according to an embodiment of the present invention, Figure 5 is a present invention It is a flowchart which shows the operation procedure by.

3 to 4, reference numeral 10 denotes a rectifying means for receiving a commercial AC input voltage output from an AC power input terminal and performing full-wave rectification with DC. The rectifying means 10 is an input for outputting a commercial AC input voltage. A power supply unit 11, a full-wave rectifier 12 for full-wave rectification by receiving a commercial AC input voltage output from the input power supply means 11, and a full-wave rectifier DC voltage, and a choo to increase the rectification efficiency of the full-wave rectifier 12 Coil (L1), smoothing capacitor (C1) for filtering the pulsating components contained in the DC voltage output from the full-wave rectifier 12, and the high-frequency components of the DC voltage output from the full-wave rectifier 12 It consists of a capacitor C2 for filtering.

And, 20 is a microcomputer that receives the DC voltage output from the rectifying means 10 and outputs a synchronous control signal for controlling the overall operation of the vessel sensor, 30 is the microcomputer 20 Relay drive means for receiving a synchronous control signal output from the microwave or an induction heating cooker to output a drive contact signal for selecting the operation, the relay drive means 30 is an output terminal (01) of the microcomputer (20) A first relay driving means 31 for receiving a synchronous control signal output from the first output contact signal for selecting an operation of the induction heating cooker, and an output from the output terminal 02 of the microcomputer 20; And second relay driving means 32 for receiving a synchronous control signal and outputting a second driving contact signal for selecting an operation of the microwave oven.

And, 40 is a relay means for receiving the drive contact signal output from the relay driving means 30 through the relay switch (RL1, RL2) on / off, 50 is from the relay driving means (50) As a cooking means for receiving the first and second driving contact signals output through the relay switches RL1 and RL2 and performing cooking functions of induction and microwave, the cooking means 50 is provided from the relay driving means 50. An induction means 51 for receiving the first driving contact signal output through the relay switch RL1 and performing a cooking function of the induction, and a second driving contact signal output from the relay driving means 50; Received via (RL2) is composed of a microwave oven 52 for performing the cooking function of the microwave.

60 is switching means for receiving a cooking operation signal output from the cooking means 50 and at the same time receiving a synchronous control signal output from the microcomputer 20 and outputting a switching signal for driving a load, The switching means 60 receives a cooking operation signal output from the cooking means 50 at the collector terminal and simultaneously receives a synchronous control signal output from the microcomputer 20 at the base terminal and operates the transistor TR1. And a protection diode D3 that is a protection element of the transistor TR1 that bypasses the counter electromotive force generated when the transistor TR1 is turned off.

In addition, in the drawing, reference numeral 70 denotes a current sensing means for receiving a switching signal output from the switching means 60 and sensing an amount of change in the current flowing in the container and outputting it to the microcomputer 20. The means 70 receives a switching signal output from the switching means 60, and includes a current transformer CT for detecting an amount of change in current flowing through the container, and a current detection signal detected by the current transformer CT. Resistor R2 and capacitor connected in parallel to the diode D5 received and rectified through R1 and the cathode terminal of the diode D5 to filter out noise components included in the rectified signal output from the diode D5. C7), and one side of the resistor R1 is connected in parallel to the anode terminal of the diode D5 and the other side is grounded.

Reference numeral 80 is a cooking selection means for setting a cooking selection signal for selecting the induction and microwave oven means of the multi-cooker to the microcomputer.

In addition, the first relay driving means 31 of the relay driving means 30 is divided into the divided resistors (R3, R4) for receiving the synchronous control signal output from the output terminal (01) of the microcomputer (20), A transistor TR3 for receiving the divided signals output from the voltage dividing resistors R3 and R4 at a base terminal and a first protection circuit 33 connected to a collector terminal of the transistor TR3 to protect the transistor TR3; And the second relay driving means 32 includes voltage divider resistors R5 and R6 for receiving and dividing a synchronous control signal output from the output terminal 02 of the microcomputer 20, and the voltage divider resistor A transistor TR4 for receiving the divided signals output from R5 and R6 from the base terminal, and a second protection circuit 34 connected to the collector terminal of the transistor TR4 to protect the transistor TR4. have.

In addition, the induction means 51 of the cooking means 50 receives the first driving contact signal output from the relay driving means 50 through the ON of the relay switch RL1 and provides an eddy current to the load and the container. The induction means 51 while receiving and charging and discharging the heating coil L2 for generating a first driving contact signal output from the relay driving means 40 and the relay switch RL1. It consists of a resonance capacitor (C3) for forming a voltage source for driving the, the microwave oven means 52 is the second drive contact signal output from the relay drive means 50 is turned on of the relay switch (RL2) Receiving capacitor (C4) and the voltage charged in the resonance capacitor (C4) to form a voltage source for driving the microwave oven 52 while charging and discharging through the (ON) is applied to the primary side Commercial exchange with low current waveform Inverter transformer 53 for converting to a power source and induced on the secondary side, and an alternating current power applied to the primary winding of the inverter transformer 53 is induced in the secondary winding, the magnetron to oscillate ultra-high frequency so that cooking can be performed ( 54) and a back voltage rectifying circuit 55 which receives the AC power induced in the secondary winding of the inverter transformer 53 and rectifies the back voltage of a high voltage and a low current and outputs it to the magnetron 54.

In addition, the first and second protection circuits 33 and 34 of the relay driving means 30 receive a voltage applied from the outside and store a coil in which one side is connected to the collector terminals of the transistors TR3 and TR4. L3 and L4 and capacitors C5 and C6 connected in parallel to the coils L3 and L4 so as to filter out noise components included in an externally applied voltage, and when the transistors TR3 and TR4 are turned off. The protection diodes D6 and D7 each have an anode terminal connected to the collector terminals of the transistors TR3 and TR4 so as to bypass the counter electromotive force generated in the transistors.

The back voltage rectifying circuit 55 of the microwave oven means 52 includes a capacitor C5 for charging the induced voltage in the secondary winding of the invert transformer 53, and a voltage charged in the capacitor C5 for a high voltage and It consists of diodes D1 and D2 which are rectified by a low voltage double voltage and output to the magnetron 54.

Hereinafter, the operation and effect of the container detecting device of the composite cooker configured as described above will be described.

First, the input voltage of the commercial AC power supplied from the input power source 11 of the composite cooker is full-wave rectified from the full-wave rectifier 12 to DC voltage, and the pulsating component contained in the rectified DC voltage is choke coil L1. The DC voltage from which the high frequency component is removed from the capacitor C2 is filtered through the oversmooth capacitor C1 to the microcomputer 20.

The computer 20 receives the filtered DC voltage output from the rectifying means 20 and outputs a synchronous control signal to the relay driving means 30 and the switching means 60 for controlling the overall operation of the vessel sensing device. do.

The relay driving means 30 receives a synchronous control signal output from the microcomputer 20 and outputs a driving contact signal to the relay means 40 for selecting an operation of a microwave oven and an induction heating cooker. The relay driving means The first relay driving means (31) receives a synchronous control signal output from the output terminal (01) of the microcomputer (20) and relays a first drive contact signal for selecting an operation of the induction heating cooker. Output to the means 40 to turn on the relay switch RL1.

In addition, the second relay driving means 32 of the relay driving means 30 receives a synchronous control signal output from the output terminal 02 of the microcomputer 20 to select a second operation of the microwave oven. The driving contact signal is output to the relay means 40 to turn on the relay switch RL2.

When the relay switch RL1 is ON, the cooking means 50 performs the cooking mode of the induction heating cooker through the induction means 51, and when the relay switch RL2 is ON, The cooking mode of the microwave is performed through the microwave means 52 of the cooking means 50.

If the user selects the desired cooking mode by the cooking selecting means 80, the cooking selection signal output from the cooking selecting means 80 is input to the microcomputer 20 to induce the induction means 51 of the multi-cooker. Alternatively, the microwave oven 52 performs an operation.

However, when the user does not select the cooking mode by the cooking selecting means 80, the microcomputer 20 synchronizes with the output terminal 01 to preferentially perform the operation of the induction means 51 within a short time. The control signal is output to the first relay driving means 31.

The induction means 51 receives the first driving contact signal output from the first relay driving means 31 through the ON of the relay switch RL1 and charges and discharges the resonance capacitor C1. A voltage source for driving the induction means 51 is formed, and eddy currents are generated in the load and the container through the heating coil L2 to start cooking while the container is heated.

In addition, the microwave oven 52 receives the second drive contact signal output from the second relay driving means 32 through the ON of the relay switch RL2, and charges and charges the resonance capacitor C4. By discharging, the inverter is transformed into a commercial AC power supply having a low current waveform through the inverter transformer 54, and the voltage is induced in the secondary winding of the inverter transformer 53. Thus, the magnetron 54 starts driving and generates ultra-high frequency waves. At this time, the back voltage rectifier circuit 55 composed of the capacitor (C5) and diodes (D1, D2) receives the AC power induced in the secondary winding of the inverter transformer 53 to drive the magnetron 54. It rectifies to DC voltage of high voltage and low current which are necessary, and outputs it to the said magnetron 54.

In addition, the switching means 60 receives a cooking operation signal output from the cooking means 50 and at the same time receives a synchronous control signal output from the microcomputer 20. A switching signal for driving the magnetron of the stove means 52 is output to the current sensing means 70, wherein the transistor TR1 of the switching means 60 is first and output from the cooking means 50. Receiving a second cooking operation signal from the collector terminal and at the same time receiving the synchronous control signal output from the microcomputer 20 from the base terminal and repeating the on / off while the resonant capacitor (C3, The voltage formed at C4) is charged and discharged, and the protection diode D3 bypasses the counter electromotive force generated when the transistor TR1 is turned off so that the transistor TR1 can be operated safely. To do that.

The current transformer CT of the current sensing means 70 receives a switching signal output from the switching means 60 and detects the amount of change in the current flowing through the container, and detects the detected current detection signal through the diode D5. While rectifying, the rectified voltage value is output to the microcomputer 20.

The microcomputer 20 receives a voltage value output from the current sensing means 70 through an input terminal I1 and uses a minimum voltage value Y (microwave oven container) preset in the microcomputer 20. Compared with the amount of change in current detected by the current transformer CT to a voltage value close to zero) and the maximum voltage value (X; the maximum voltage value generated when the load is shorted), the container used for the multicooker is an induction container. Alternatively, it is possible to determine whether a short occurs in the microwave cooker or the composite cooker and perform a cooking function suitable for the container.

Next, a container detecting method of a composite cooker according to the present invention will be described in detail with reference to FIG. In FIG. 5, S denotes a step.

5 is a flowchart showing an operation procedure according to the present invention.

First, the input voltage of the commercial AC power supplied from the input power supply unit 11 of the composite cooker is full-wave rectified by the full-wave rectifier 12 into a DC voltage, and the pulsating component contained in the rectified DC voltage is cork coil (L1). ) And a DC voltage from which a high frequency component is removed from the capacitor C2 while being filtered through the smoothing capacitor C1 is applied to the microcomputer 20, thereby causing the composite cooker to start operation.

At this time, in order to detect the container of the compound cooker, in step S1, the compound cooker is initialized according to the container detecting function, and then the process proceeds to step S2, whereby the selection mode of the cooking means 50 desired by the cooking selection means 80 It is determined whether it is input to the microcomputer 20.

As a result of the discrimination in step S2, when the selection mode of the cooking selection means 80 is not input to the microcomputer 20 (No), the flow advances to step S3 and the cooking mode of the induction means 51 for a short time. In step S4, the current sensing means 70 detects the amount of change in the current flowing through the container, converts the detected amount of current change into a voltage value V, and outputs it to the microcomputer 20.

Subsequently, in step S5, the voltage value V sensed by the current sensing means 70 in step S4 is the maximum voltage value X which is set in advance in the microcomputer 20, when the load is shorted. If the voltage value (V) determined by the microcomputer 20 is not greater than the maximum voltage value (X) (No), the process proceeds to step S6 and the process proceeds to step S4. The voltage value V sensed by the current sensing means 70 of the microcomputer 20 is less than the minimum voltage value Y preset in the microcomputer 20 (the voltage value of the current detected by the current transformer is close to zero). Determine whether it is small.

As a result of the discrimination in step S6, when the voltage value V determined by the microcomputer 20 is not smaller than the minimum voltage value Y (No), the process proceeds to step S7 and the current sensing means 70 If the detected voltage value V is larger than the minimum voltage value Y preset in the microcomputer 20 and smaller than the maximum voltage value X (Yes), the induction means ( The cooking mode of 51) is performed.

On the other hand, when the determination result in step S6 indicates that the voltage value V determined by the microcomputer 20 is smaller than the minimum voltage value Y (Yes), it is determined whether the door of the multicooker is closed. If it is determined that the door of the compound cooker is closed (Yes), the process proceeds to step S10 and the cooking mode of the microwave oven 52 is performed.

As a result of the discrimination in step S2, when the selection mode of the cooking selection means 80 is input to the microcomputer 20 (Yes), the process proceeds to step S11 and the induction means 51 and the electronic device desired by the user are selected. The operation is terminated while the selected cooking mode of the ranger 52 is performed.

As described above, according to the vessel sensing device and the vessel sensing method of the composite cooker according to the present invention, the function of the microwave oven or the induction heater can be selected by sensing the current flowing through the vessel using the current sensing means. Simple configuration and low manufacturing cost has an excellent effect, and the microcomputer and the relay means can be used to distinguish the functions of the microwave oven and induction heating cooker as well as to operate in parallel.

Claims (14)

Rectification means for full-wave rectification by receiving a commercial AC input voltage output from the AC power input terminal, and a microcomputer for receiving a DC voltage output from the rectifying means and outputting a synchronous control signal for controlling the overall operation of the vessel sensing device. And relay driving means for receiving a synchronous control signal output from the microcomputer and outputting a driving contact signal for selecting an operation of a microwave oven or an induction heating cooker, receiving induction and receiving a driving contact signal output from the relay driving means. Switching for outputting a switching signal for driving the load by receiving a cooking means for performing a cooking function of the microwave, and a cooking operation signal output from the cooking means and receiving a synchronous control signal output from the microcomputer Means and the switching means Receiving a switching signal output from the vessel sensing device of the composite cooker comprising a current sensing means for sensing the amount of change in the current flowing in the vessel and outputs to the microcomputer. The rectifier of claim 1, wherein the rectifying means comprises: an input power supply for outputting a commercial AC input voltage; a full-wave rectifier for receiving a commercial AC input voltage output from the input power supply means; Filters the high-frequency component of the DC voltage output from the full rectifier coil (L1), the smoothing capacitor (C1) for filtering the pulsation components contained in the DC voltage output from the full-wave rectifier to increase the efficiency Container sensing device of a composite cooker, characterized in that consisting of a capacitor (C2). A first relay drive according to claim 1, wherein said relay drive means receives a synchronous control signal output from an output terminal (01) of said microcomputer and outputs a first drive contact signal for selecting an operation of an induction heating cooker. Means and second relay driving means for receiving a synchronous control signal output from the output terminal 02 of the microcomputer and outputting a second driving contact signal for selecting the operation of the microwave oven. Container detection device of multi cooker. The method according to claim 1, wherein the cooking means comprises: induction means for performing an induction cooking function by receiving an ON signal of the relay switch RL1 output from the relay means, and a relay switch RL2 output from the relay means. Receiving an ON signal of the container detection apparatus of the multi-cooker, characterized in that consisting of a microwave means for performing a cooking function of the microwave. The synchronization control signal of claim 1, wherein the switching means receives the first and second cooking operation signals output from the induction means and the microwave means of the cooking means at the collector terminal and is output from the microcomputer. And a protective diode (D3) which is a protection element of the transistor (TR1) which bypasses the counter electromotive force generated when the transistor (TR1) is turned off and operates when the transistor (TR1) is operated by the base terminal. Container detection device of multi cooker. The current detecting means according to claim 1, wherein the current sensing means comprises: a current transformer CT for receiving a switching signal output from the switching means and detecting an amount of change in current flowing through the container; and a current detection signal detected by the current transformer CT. And a resistor (R1, R2) connected in parallel to the cathode terminal of the diode (D5) to limit the current component of the rectified signal output from the diode (D5) to rectify and rectify Container detection device of a composite cooker. 4. The first relay driving means is provided with voltage divider resistors R3 and R4 for receiving and dividing a synchronous control signal output from the output terminal 01 of the microcomputer, and outputs from the voltage divider resistors R3 and R4. A transistor of the cooker, comprising a transistor (TR3) for receiving the divided voltage signal from the base terminal and a first protection circuit connected to the collector terminal of the transistor (TR3) to protect the transistor (TR3). Sensing device. 4. The second relay driving means comprises: a voltage divider (R5, R6) for receiving and dividing a synchronous control signal output from the output terminal (02) of the microcomputer and the voltage divider (R5, R6). And a second protective circuit connected to a collector terminal of the transistor TR4 so as to protect the transistor TR4. Container sensing device. The heating coil (L2) according to claim 4, wherein the induction means receives the first driving contact signal output from the relay driving means through the ON of the relay switch RL1 and generates eddy currents in the load and the container. And a resonant capacitor (C3) configured to receive a second driving contact signal output from the relay driving means through the ON of the relay switch RL1 and to charge and discharge the power supply to drive the induction means. Container detection device of a composite cooker, characterized in that consisting of. The method of claim 4, wherein the microwave oven means is configured to drive the microwave oven while charging and discharging the first driving contact signal output from the relay driving unit through the ON of the relay switch RL2. Resonant capacitor (C4) forming the power supply pressure, and the inverter transformer for converting the voltage charged in the resonant capacitor (C4) to the primary side by converting into a commercial AC power supply having a low current waveform and induced to the secondary side; And a magnetron for generating cooking by oscillating ultra-high frequency by inducing the AC power applied to the primary winding of the inverter transformer to the secondary winding, and receiving the AC power induced in the secondary winding of the inverter transformer to receive high voltage and low voltage. And a back pressure rectifier circuit rectified by a double voltage of the current and output to the magnetron. 8. The first protective circuit of claim 7, wherein the first protection circuit is included in a coil L3 having one side connected to a collector terminal of the transistor TR3 to receive a voltage applied from the outside and to accumulate a voltage. A capacitor C5 connected in parallel to the coil L3 to filter the noise component and an anode terminal connected to the collector terminal of the transistor TR3 to bypass the counter electromotive force generated when the transistor TR3 is turned off. Container detecting device for a composite cooker, characterized in that the protective diode (D6). 9. The noise protection circuit of claim 8, wherein the two protection circuits include a coil L4 having one side connected to a collector terminal of the transistor TR4 to receive a voltage applied from the outside and accumulate the voltage, and a noise included in the voltage applied from the outside. For protection, the anode terminal is connected to the collector terminal of the transistor TR4 so as to bypass the capacitor C6 connected in parallel to the coil L4 so as to filter the components and the counter electromotive force generated when the transistor TR4 is turned off. Container detecting apparatus for a composite cooker, characterized in that the diode (D7). 11. The method of claim 10, wherein the back-pressure rectifier circuit is a capacitor (C5) for charging the voltage induced in the secondary winding of the inverter transformer, and the voltage charged in the capacitor (C5) rectified to a high voltage and low current double voltage And a diode (D1, D2) connected in parallel with the capacitor (C5) to output to the magnetron. When the cooking means discriminating step of determining whether the selection mode of the cooking means desired by the cooking selecting means is input to the microcomputer and the selection mode of the cooking selecting means determined in the cooking means discriminating step is not input to the microcomputer. The current detection step of detecting the amount of change of the current flowing in the container by the current sensing means while performing the cooking mode of the induction means, and the voltage value (V) detected by the current sensing means in the current detection step is stored in the microcomputer. A maximum voltage judging step for judging whether the maximum voltage value X is greater than a predetermined maximum voltage value X, and the current sensing means when the voltage value V determined in the maximum voltage judging step is not larger than the maximum voltage value X. Voltage plate for judging whether the detected voltage value (V) is smaller than the minimum voltage value (Y) preset in the microcomputer. If the voltage value V determined in the step and the minimum voltage judging step is not smaller than the minimum voltage value Y, the minimum voltage value V detected by the current sensing means is preset in the microcomputer. The induction manual step operating in the cooking mode of the induction means while determining whether it is larger than the voltage value Y and smaller than the maximum voltage value X and the voltage value V determined in the minimum voltage discrimination step are the minimum voltage value Y. Is less than the microwave oven driving step operating in the cooking mode of the cooking selection means, and the selection mode of the cooking selection means determined in the cooking means discrimination step is inputted to the microcomputer. If the container sensing method of the multi-cooker, characterized in that consisting of a selection mode driving step for performing the selected cooking mode.