KR100455181B1 - Heterogeneous Heatable Electromagnetic Induction Heating Cooker - Google Patents

Abstract

The present invention relates to an electromagnetic induction heating cooker capable of heterogeneous simultaneous heating, and in the related art, since the preference for the rice state is different for each person, there is an inconvenience in that the taste of family members can not all be met, and the die is not rice among the family members. If there is a person to cook and then boil porridge again because time is a big problem. Therefore, the present invention can be equipped with two or more containers in one cooker body, and provided with a container lid to be detachable facing the container on the inside of the body lid connected to the main body, allowing heterogeneous simultaneous heating Eliminating unnecessary time wasted, two inverters can be driven by one inverter to simplify system configuration.

Description

Heterogeneous simultaneous heating induction heating cooker

The present invention relates to a heterogeneous simultaneous induction heating induction cooker capable of simultaneously performing heterogeneous cooking of different kinds, and in particular, two containers in one cooker may be used independently of each other. Rather, the present invention relates to a heterogeneous simultaneous induction heating machine capable of simultaneously performing heterogeneous cooking.

The structure of the conventional electromagnetic induction heating collector, as shown in Fig. 1, is provided with a container mounting portion for attaching and detaching the container (2) in the main body 1, and is connected to the main body 1 to open and close The main body lid 3 is installed on the upper part of the main body 1, and the container lid 4 is attached to the inner side of the main body lid 3, and the user selects cooking on the front of the main body 1. The key operation part 5 and the display part 6 for showing a progress state according to the operation of the said key operation part 5 are provided.

In addition, the circuit configuration of the electromagnetic induction heating collector, as shown in Figure 2, the rectifier 10 for rectifying the input power to the DC voltage using the filter capacitor (C) and the bridge diode (BD), and the rectifier LC filter unit 11 consisting of a choke coil (L1) and smoothing capacitor (C1) for filtering to improve the power factor by receiving the DC voltage output from the (10), and the voltage output from the LC filter unit 11 A working coil L2 operating in parallel with the resonant capacitor C2 connected in parallel to the container 2 to induce an eddy current, and a switching element S1 for controlling the operation of the working coil L2; A current detector 12 for detecting an amount of current through a current detector CT for detecting a current supplied from an input power source to a load side, and a pulse for induction heating according to the amount of current detected by the current detector 12. Outputting width modulation control signal PWM The frequency generator 14 generates a frequency corresponding to the pulse width modulation control signal PWM output from the controller 13, the frequency generator 14, and the frequency generated by the frequency generator 14. The driving control unit 15 turns on or off the switching element S1.

Referring to the prior art configured in this way in detail as follows.

When the user puts rice and water into the container 2 of the cooker, puts it on the container support in the main body 1, and covers the main body lid 3, it becomes ready to cook.

In this way, the ready state is completed and the user presses the cooking button on the external key control unit 5 to recognize that cooking in the control unit 13 shown in Fig. 2 and starts heating.

That is, the control unit 13 first detects the amount of current through the current detector CT and the current detector 12 for the current flowing through the input power source, and generates a frequency to generate an appropriate power according to the detected amount of current. The unit 14 outputs the pulse width modulation control signal PWM.

Then, the frequency generator 14 generates a frequency proportional to the pulse width modulation control signal PWM to the drive controller 15.

Accordingly, the driving controller 15 outputs a gate driving signal to the gate of the switching element S1 according to the frequency input from the frequency generator 14.

At this time, the input power is rectified to the DC voltage by the filter capacitor (C) and the bridge diode (BD) of the rectifier 10, the rectified DC voltage is choke coil (L1) and smoothing capacitor ( The voltage filtered by C1) is supplied to the working coil L2 and the resonant capacitor C2, respectively.

For example, when the driving control unit 15 outputs the gate driving signal as shown in FIG. 3A to the gate of the switching device S1, the switching device S1 is turned on, and the current gradually increases in the switching device. When the switching element S2 is off, no current flows. As a result, a current waveform as shown in (b) of FIG. 3 is obtained.

At this time, the resonant capacitor C2 charges and discharges in a short time as shown in (c) of FIG. 3 when the switching element S1 is turned off and the increased current is cut off. As shown in Fig. 3), the voltage is applied by the voltage Vc corresponding to the period of charge and discharge.

가 형성되어 주파수변환(20~30KHz)에 의해 LC공진에 따른 공진전류로 용기(2)에 와전류를 유도시켜 가열한다.Therefore, when the container 2 is placed on the working coil L2, the L value is fixed, and the fixed L value is the resonance frequency according to the resonance capacitor C2 value.

Is formed to induce an eddy current in the vessel (2) by the resonant current according to the LC resonance by the frequency conversion (20 ~ 30KHz) to heat.

So it becomes rice.

However, in the prior art as described above, the preference for the rice condition for each person is different according to each individual's taste, and some people like rice and some people like rice a little. After all, there is a discomfort that can not fit all the tastes of the family members, if you need to die instead of rice, because each has to be uncomfortable, there is a big waste of time.

Therefore, an object of the present invention for solving the conventional problems as described above is to configure two containers in one cooker each independently so as to eliminate the unnecessary waste of time by simultaneously performing different types of cooking according to their tastes It is to provide an electromagnetic induction heating cooker capable of simultaneous heterogeneous heating.

Another object of the present invention is to provide a heterogeneous simultaneous induction heating induction cooker capable of driving two loads with one inverter to simplify the system configuration.

The present invention for achieving the above object is configured to mount the two containers in the body, the inner side of the body lid connected to the main body and the two container lids to be detachable facing the two containers, respectively And a first key input unit and a second key input unit for operating the two containers, respectively, on one display unit.

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

4 is a block diagram of the present invention heterogeneous simultaneous heating capable electromagnetic induction heating cooker, as shown, the main body lid 3 is installed on the main body 1 so as to be opened and closed with the main body 1, Two containers 14a and 14b can be mounted in a large table, and two containers can be detachably faced with the two containers 14a and 14b inside the body lid 3. The lids 15a and 15b are respectively configured, and the first key input section 16a and the second key input section 16b for operating the two containers 14a and 14b respectively are one display section 17. It is provided in the configuration.

In addition, the circuit configuration of the heterogeneous simultaneous induction heating electromagnetic induction heating device according to the present invention, as shown in Figure 5, the rectifying unit for rectifying the input power to the DC voltage using the filter capacitor (C) and the bridge diode (BD) ( 101, an LC filter unit 102 including a choke coil L1 and a smoothing capacitor C1 for receiving a DC voltage output from the rectifying unit 101 to improve power factor, and a load side at the input power supply side. An input current detection unit 103 for detecting a current supplied to the key, a key input / output unit 104 for the user to perform an operation for cooking, and a key signal and an input current detection unit 103 output from the key input / output unit 104. A control unit 105 for outputting a pulse width modulation control signal for driving the switching element according to the input current output from the control unit, an oscillation unit 106 for generating a frequency corresponding to the control signal of the control unit 105, and the oscillation; The switching element driver 107 for turning on / off the switching element according to the frequency generated by the unit 106, and the first and second working coils for heating the first vessel 14a and the second vessel 14b ( A switching unit 108 for heating the first and second working coils Lr1 and Lr2 by turning on or off the switching elements according to Lr1 and Lr2 and the switching signal of the switching element driver 107; According to the control output of 105, for selecting whether to heat one or both of the first and second working coils Lr1 and Lr2 capable of heating two different containers, respectively. It consists of the relay drive part 109 which controls the relay switch RY1.

When described in detail with respect to the operation and effect of the present invention configured as described above.

When the user puts the object in each of the containers 14a and 14b and closes the main body lid 3, the user is ready to cook.

Subsequently, when the user presses the start button through the first key input unit 16a and the second key input unit 16b attached to the display unit 17, the controller 105 of FIG. 5 recognizes the pulse width to the oscillator 106. Output the modulation control signal.

Then, the oscillator 106 outputs a frequency proportional to the pulse width modulation control signal input from the controller 105 to the switching element driver 107, and the switching element driver 107 is a switching element of the switching unit 108. A switching control signal for alternately operating (S1, S2) is output.

At this time, the input power is rectified to the DC voltage through the filter capacitor (C) and the bridge diode (BD) of the rectifier 101, the rectified voltage is the choke coil (L1) and smoothing capacitor (C1) of the LC filter (102) Then, the filtered voltage is supplied to the switching unit 108.

If the operation of the Lr1 working coil of the two wicking coil (Lr1, Lr2) will be described as follows.

First, the control unit 105 determines whether there is a container from the container detection sensor 110 and the sensor signal processing unit 111, and if there is a container, the relay drive signal to the relay driver 109 as shown in FIG. 7A. The output terminal of the relay RY1 is connected to the first terminal, and the switching element S1 of the switching unit 108 is turned off via the oscillation unit 106 and the switching element driving unit 107 and the switching element S2. ) Warms up.

Then, the input voltage Vd is applied to the resonant tank by the wicking coil Lr1 and the resonant capacitor Cr1 to start resonance, and the current i_Lr1 flowing through the working coil Lr1 is shown in FIG. It begins to ascend.

If the switching element S2 is turned off before the resonant half cycle passes, the auxiliary capacitors Ca1 and Ca3 perform auxiliary resonance with the resonant tanks Lr1 and Cr1 so that the voltage of the auxiliary capacitor Ca1 drops from Vd to zero, and the auxiliary capacitor ( The voltage of Ca3) rises from zero to Vd.

Thereafter, the antiparallel diode Da1 of the switching element S1 is turned on, and zero voltage is applied to the resonant tanks Lr1 and Cr1.

Then, resonance occurs continuously by the voltage charged in the resonance capacitor Cr1, and the switching element S1 is turned on under the condition of zero voltage.

The resonance current drops to zero by the continuous resonance, and this time the resonance current increases by resonance in the opposite direction.

If the switching element S1 is turned off before the resonant half-cycle passes, the auxiliary capacitors Ca1 and Ca2 perform auxiliary resonance with the resonant tank so that the voltage of the auxiliary capacitor Ca2 drops from Vd voltage to zero and the voltage of the auxiliary capacitor Ca1 in between. Rises from zero to Vd.

Thereafter, the antiparallel diode Da2 of the switching element S2 is turned on so that the voltage Vd is applied to the resonant tanks Lr1 and Cr1.

Then, resonance occurs continuously and is turned on under the condition of zero voltage of the switching element S2. When the resonance current drops to zero due to the continuous resonance, one cycle of operation ends and the same operation is repeated.

When the switching elements S1 and S2 as shown in FIG. 7A are alternately operated, the current i_Lr1 as in FIG. 7C flows, and the eddy current generated in the load by the induced current as described above. The container 14a is heated by current.

The operation of the Lr2 working coil among the two working coils Lr1 and Lr2 will be described below.

First, the control unit 105 outputs a relay driving signal to the relay driving unit 109 as shown in FIG. 7B so that the movable terminal of the relay RY1 is connected to the second terminal, and the oscillation unit 106 and the switching element are provided. The switching element S1 of the switching unit 108 is turned off and the switching element S2 is turned on via the driving unit 107.

Then, the input voltage Vd is applied to the resonant tank by the wicking coil Lr2 and the resonant capacitor Cr2 to start the resonance, and the current flowing through the working coil Lr2 starts to rise.

If the switching element S2 is turned off before the resonant half cycle passes, the auxiliary capacitors Ca1 and Ca2 perform auxiliary resonance with the resonant tanks Lr2 and Cr2 so that the voltage of the auxiliary capacitor Ca2 drops from Vd to zero, and the auxiliary capacitor (between them). The voltage of Ca1) rises from zero to Vd.

Thereafter, the antiparallel diode Da2 of the switching element S2 is turned on, and zero voltage is applied to the resonant tanks Lr2 and Cr1.

Then, resonance continues by the voltage charged in the resonant capacitor Cr2, and the switching element S1 is turned on under the condition of zero voltage.

The resonance current drops to zero by the continuous resonance, and this time the resonance current increases by resonance in the opposite direction.

If the switching element S1 is turned off before the resonant half-cycle passes, the auxiliary capacitors Ca1 and Ca2 perform auxiliary resonance with the resonant tank so that the voltage of the auxiliary capacitor Ca1 drops from Vd voltage to zero and the voltage of the auxiliary capacitor Ca2 in the meantime. Rises from zero to Vd.

Thereafter, the anti-parallel diode Da1 of the switching element S1 is turned on so that the voltage Vd is applied to the resonant tanks Lr2 and Cr2.

Then, resonance occurs continuously and is turned on under the condition of zero voltage of the switching element S2. When the resonance current drops to zero due to the continuous resonance, one cycle of operation ends and the same operation is repeated.

The vessel 14b is heated by the eddy current generated in the vessel 14b by the induced current.

In this way, the vessel 14a or the vessel 14b is heated and heated for a suitable time using the temperature sensor 112 to cook rice or porridge.

The above operation will be described with reference to FIG. 8 as follows.

The controller 105 determines whether the containers 14a and 14b are present using the container detection sensor 110 (S11), and then decides whether to cook the two containers 14a and 14b simultaneously or only one. It determines (S12).

As a result of the determination in step S12, when the containers 14a and 14b are simultaneously cooked, the control unit 105 switches the movable terminal of the relay switch RY1 to one terminal through the relay driving unit 109 (S13). The switching element S2 of the unit 108 is turned on first, and then the container 14a is heated in an alternating operation of turning on the switching element S1 (S14), and then the movable terminal of the relay switch RY1 is connected to two terminals. After switching to (S15), the switching element S1 of the switching unit 108 is first turned on, and then the container 14b is heated in an alternate operation of turning on the switching element S2.

Eventually, the containers 14a and 14b are simultaneously cooked to suit the taste of the user.

In the case where only one container 14a is to be cooked in step S12 (S17), the controller 105 drives the relay driver 109 to switch the movable terminal of the relay switch RY1 to one terminal (S18). In step S19, the switching element S2 is first turned on, and only the container 14a is heated in an alternate operation of turning on the switching element S1.

In this case, only the said container 14a is used independently.

And if you want to cook only another container 14b in step S12 (S20), the control unit 105 drives the relay drive unit 109 to switch the movable terminal of the relay switch (RY1) to two terminals (S21) In step S22, only the container 14b is heated in an alternate operation of turning on the switching element S1 and then turning on the switching element S2.

In this case, only the container 14b is used independently.

FIG. 6 is a first embodiment of the heating unit in FIG. 5, and as shown therein, switching elements S1 and S2 connected in series to the smoothing capacitor C1 of the LC filter unit are connected in parallel, and the switching element S1. A first heating unit and a second heating unit, each of which has a wicking coil and a resonant capacitor connected in series, are connected in parallel, and a movable terminal is connected to the switching element S1, and a first terminal is connected to the first heating unit and a second heating unit The relay switch RY1 to which two terminals are connected is connected.

In this case, the container is heated and cooked in the same manner as in FIG. 5 described above.

As described above, the present invention configures two containers in one cooking machine so that each can be used independently, and can simultaneously perform heterogeneous cooking according to their tastes, eliminating unnecessary waste of time. Inverter can drive two loads has the effect of simplifying the system configuration.

1 is a block diagram of a conventional electromagnetic induction heating cooker.

Figure 2 is a circuit diagram of a conventional electromagnetic induction heating cooker.

3 is a signal waveform diagram of each part in FIG. 2;

Figure 4 is a schematic view of the present invention heterogeneous simultaneous heating capable electromagnetic induction heating cooker.

Figure 5 is a circuit diagram of the present invention heterogeneous simultaneous heating capable electromagnetic induction heating cooker.

6 is a circuit diagram illustrating another configuration example of a heating unit in FIG. 5.

FIG. 7 is a diagram showing switching states and current waveforms of each working coil in FIG. 6; FIG.

8 is a control operation process diagram of the present invention heterogeneous simultaneous heating capable electromagnetic induction heating cooker.

*** Explanation of symbols for main parts of drawing ***

101: rectifying part 102: LC filter part

103: input current detection unit 104: key input and output unit

105: control unit 106: oscillation unit

107: switching element driver 108: switching unit

109: relay drive unit 110: container detection sensor

111: sensor signal processing unit

Claims (4)

Two or more containers can be mounted in one main body of the main body, and the inner side of the body lid connected to the main body is provided with a container lid to be detachable facing the container, characterized in that the heterogeneous simultaneous heating possible induction heating Cooker. The heterogeneous simultaneous heating capable electromagnetic induction heating cooker according to claim 1, further comprising one display unit configured to select two or more cooking states in front of the main body. 2. The heterogeneous co-heating electromagnetic induction heating cooker according to claim 1, wherein the two or more containers are each independently used. LC filter part consisting of choke coil and smoothing condenser to receive power from the rectifier rectifying the input power to improve the power factor, an input current detection part detecting current supplied from the input power side to the load side, and a user A control unit for outputting a pulse input / output unit for performing an operation for cooking, a pulse width modulation control signal for driving a switching element according to the key signal output from the key input / output unit, and an input current output from the input current detection unit; An oscillator for generating a frequency corresponding to the control signal of the oscillator, a switching element driver for turning on / off a switching element according to the frequency generated by the oscillator, and first and second walking for heating the first and second containers. The first and second working devices are turned on or off according to a coil and a switching signal of the switching device driver. Selects whether to heat one or both of the first and second working coils capable of heating two different containers, respectively, according to the control unit's control output. Heterogeneous heating capable electromagnetic induction heating cooker, characterized in that consisting of a relay drive unit for controlling a relay switch for.

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