KR0168088B1 - Complex cooker - Google Patents

Abstract

The present invention relates to a composite cooker having a combination of a microwave oven and an induction heating cooker, wherein the cooker can cook food by induction heating or dielectric heating. The current detection means for detecting and the induction heating are selected at the time of initial driving of the composite cooker, and a control signal is output to drive the switching element, and the current variation is not detected by the current detection means while the induction heating is selected. A microcomputer outputting a control signal to select dielectric heating, relay means for driving a relay to select induction heating or dielectric heating according to a control signal output from the microcomputer, and a control signal output from the microcomputer. Induce heating of food by driving switching element Or a switching means for dielectric heating.

Description

Cooker

1 is a control block diagram of a multi-cooker according to an embodiment of the present invention.

2 is a detailed circuit diagram of a composite cooker according to an embodiment of the present invention.

3 is a circuit diagram of another embodiment of part A ′ of FIG. 2.

* Explanation of symbols for main parts of the drawings

1: AC power input means 10: rectification means

20: current detection means 30: microcomputer

40: relay means 50: cooking means

51: induction means 52: microwave oven means

53: high voltage transformer 54: magnetron

55 back pressure rectification circuit 60 switching means

62: discharge part 63: reference voltage generator

The present invention relates to a complex cooker having a combination of functions of a microwave oven and an induction heating cooker.

In general, the conventional cooker was using a separate product of a separate concept of a microwave (Micro Wave Oven) and induction heating (Induction).

However, in such a use method, not only can not perform a cooking function suitable for the characteristics of the container, there is a problem that it is difficult to meet the various cooking needs of the user because the cooking function of the product is limited.

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 seeking to simplify the kitchen space. Not only is there a disadvantage, but there is a problem that the cost increases because two products must be purchased at the same time.

Therefore, 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 detect the variation of the current input to the load by using a current detecting means to function as a microwave oven or an induction heating cooker. Since it is possible to choose a simple configuration and low manufacturing cost to provide a composite cooker.

Another object of the present invention to provide a multi-cooker that can operate in parallel as well as to operate the function of the microwave oven and induction heating cooker using a microcomputer and a relay.

Still another object of the present invention is to provide a composite cooker which can guarantee the safety of the cooker by preventing the destruction of the switching element by using the switching means.

In order to achieve the above object, the composite cooker according to the present invention is a composite cooker capable of cooking food by induction heating or dielectric heating, the current detecting means for detecting the amount of change of the current input from the rectifying means to the load, and the composite cooker The control signal is output to select the induction heating at the time of initial driving and to drive the switching element. If the current variation is not detected by the current detecting means while the induction heating is selected, the control signal is selected to select the dielectric heating. A microcomputer for outputting, relay means for driving a relay to select induction heating or dielectric heating according to a control signal output from the microcomputer, and driving a switching element in accordance with a control signal output from the microcomputer to induce food Including switching means for heating or dielectric heating Characterized in that configured.

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

1 is a control block diagram of a composite cooker according to an embodiment of the present invention, Figure 2 is a detailed circuit diagram of a composite cooker according to an embodiment of the present invention, Figure 3 is another embodiment of the portion A 'of FIG. It is a circuit diagram which shows the example.

1 to 2, the composite cooker receives the AC power input means 1 for outputting the AC power input voltage and the AC power input from the AC power input means 1, and performs full-wave rectification with DC. Rectifying means 10, current detecting means 20 for detecting the amount of change of current input to the load by receiving a constant DC voltage output from the rectifying means 10, and the current output from the current detecting means 20 Selecting an operation of a microwave oven or an induction heating cooker by receiving a detection signal and outputting a control signal for controlling the overall operation of the multicooker, and receiving a control signal output from the microcomputer 30. Induction and microwave oven by receiving the on / off signals of the relay means for outputting the on / off signal for the relay and the relays (RL1, RL2) output from the relay means 40 And cooking means (50) for performing a cooking function, receives the control signal outputted from the microcomputer 30 is composed of a switching means for outputting to said cooking means (50) which operates the switching device drives the load.

In FIG. 4, the relay means 40 is composed of relays RL1 and RL2 connected in parallel to the current detection means 20, and the cooking means 50 is output from the relay means 40. In FIG. Induction means 51 for receiving the ON signal of the relay RL1 to perform a cooking function of the induction mode, and receiving the ON signal of the relay RL2 output from the relay means 40 It is composed of a microwave oven 52 for performing the cooking function of the microwave mode.

The switching means 60 receives a control signal output from the microcomputer 30 and switches the transistor TR1 for driving a load and the cooking means 50 when the transistor TR1 is turned off. A discharge part 62 connected in parallel to the collector terminal of the transistor TR1 to discharge the voltage charged in the resonant capacitors C1 and C2, and the collector of the transistor TR1 at the time of turning on the transistor TR1; The resonance voltage Vce generated between the emitter terminal and the emitter terminal is inputted from the inverting terminal (-) through the voltage divider resistors R1 and R2, and the reference voltage signal output from the reference voltage generator 63 is received from the non-inverting terminal ( The comparator COM receives the comparator COM and compares the comparator COM. The voltage signal output from the comparator COM is applied to the microcomputer 30.

In addition, in the drawing, the induction means 51 receives a DC voltage from the rectifying means 10 at the time of the relay RL1 ON of the relay means 40 and generates an eddy current in the load and the container. The heating to form a coil L1 and a voltage source for driving the induction means 51 while charging and discharging the DC voltage from the rectifying means 10 when the relay RL1 is ON. Resonant capacitor C1 connected in parallel to the coil L1, the microwave oven means 52 is the rectifying means 10 when the relay (RL2) of the relay means 40 is ON (ON) A high voltage transformer 53 for converting the DC voltage from the primary side into a high voltage and receiving and directing the DC voltage from the rectifying means 10 when the relay RL2 is ON. The high to form a voltage source for driving the ranger 52 The magnetron for resonating capacitor C2 connected in parallel to the transformer 53 and the AC power applied to the primary winding of the high voltage transformer 53 is induced in the secondary winding to oscillate ultra high frequency so that cooking can be performed. 54) and a back voltage rectifying circuit 55 which receives the voltage on the secondary winding of the high voltage transformer 53, rectifies the voltage of the high voltage and the low current, and outputs the voltage to the magnetron 54.

The back pressure rectifying circuit 55 of the microwave oven means 52 includes a capacitor C3 for charging a voltage induced in the secondary winding of the high voltage transformer 53, and a voltage charged in the capacitor C3 for a high voltage and It consists of diodes D1 and D2 which are rectified by a low current double voltage and output to the magnetron 54.

In addition, the discharge portion 62 of the switching means 60 is a capacitor (C4) for discharging the voltage charged in the resonant capacitor (C1, C2) of the cooking means 50, and in series with the capacitor (C4) It consists of resistors R1 and R2 connected by.

3, the switching means 70 receives a control signal output from the microcomputer 30, switches the transistor TR2 to drive a load, and at the time of turning off the transistor TR2. A discharge portion 72 connected to the collector terminal of the transistor TR2 to discharge the voltage charged in the resonant capacitors C1 and C2 of the cooking means 50, and the transistor at the time of turning on the transistor TR2. The reference voltage signal is output from the reference voltage generator 73 while the resonant voltage Vce generated between the collector of the TR2 and the emitter terminal is input from the inverting terminal (-) through the voltage divider R3 and R4. Is received from the non-inverting terminal (+) and the comparator COM19 for comparing them, and the voltage signal output from the comparator (COM1) is received from the non-inverting terminal (+) and at the same time triangular wave from the triangular wave generator 74 Receive the signal from the inverting terminal (-) and compare it And a pulse width modulator COM2 for modulating the pulse width of the voltage signal, and driving means 75 for driving control of the transistor TR2 in accordance with a square wave signal output from the pulse width modulator COM2. The discharge unit 72 includes a capacitor C5 for discharging the voltage charged in the resonant capacitors C1 and C2 of the cooking means 50, and a resistor R3 connected in series with the capacitor C5. , R4).

Hereinafter, the effect of the composite cooker configured as described above will be described.

First, when the input voltage of the commercial AC power output from the AC power input means 1 of the composite cooker is applied to the current detecting means 20 by full-wave rectifying from the rectifying means 10 to DC, the current detecting means 20 In the present invention, a constant DC voltage output from the rectifying means 10 detects a variation in the current input to the load, and outputs the current detection signal to the microcomputer 30. At the same time, the control signal is output to the relay means 40 and the switching means 60 to select the induction heating and drive the switching element, and the current is detected by the current detecting means 20 in the state where the induction heating is selected. If a variation is detected, a control signal is output to the relay means 40 to select induction heating, and if a current variation is not detected, a control signal is selected to select dielectric heating. Output to the relay means 40.

That is, if induction heating is selected when the material of the cooking vessel located in the cooking chamber is iron, the current variation is detected by the current detecting means 20, and induction heating when the material of the cooking vessel located in the cooking chamber is not iron. If this is selected, the amount of change in current is not detected by the current detecting means 20.

Therefore, when the induction heating is not made properly because the material of the cooking vessel is not iron, the dielectric heating can be automatically selected.

The relay means 40 receives the control signal output from the microcomputer 30 and selects on / off of the relays RL1 and RL2 for selecting an operation of the microwave oven or the induction heating cooker. When the amount of change in the current input to the load is detected by 20), the induction means 51 receives the control signal from the microcomputer 30 by a relay driving means (not shown) and turns on the relay RL1. Receiving the DC voltage output from the rectifying means 10 while charging and discharging in the resonant capacitor (C1) generates eddy currents in the load and the container through the heating coil (L1) to start cooking.

In addition, when the amount of change in the current input to the load by the current detecting means 20 is not detected, the relay driving means (not shown) receives the control signal output from the microcomputer 30 to turn on the relay RL2 ( By turning ON), the microwave oven 52 receives the DC voltage output from the rectifier 10 from the resonant capacitor C2 and converts the voltage from the high voltage transformer 53 to the high voltage while charging and discharging. By being induced, the magnetron 54 starts driving and starts cooking by starting the high frequency. At this time, the back voltage rectifying circuit 55 composed of the capacitor C3 and the diodes D1 and D2 is used as the secondary of the high voltage transformer 53. It receives the AC power induced in the winding and rectifies the DC voltage of the high voltage and the low current required for driving the magnetron 54 and outputs the same to the magnetron 54.

In addition, the transistor TR1 of the switching means 60 receives a control signal output from the microcomputer 30 and is turned on or off. In the normal operation of the composite cooker, the microcomputer 60 has a high level. A control signal is applied to the base terminal of the transistor TR1 so that the transistor TR1 is turned on and the cooking means 50 starts the cooking operation.

At this time, when the resonant voltage Vce generated between the collector of the transistor TR1 and the emitter terminal is applied to the inverting terminal (-) of the comparator COM through the voltage divider R1 and R2, the comparator COM In comparison, the resonance voltage Vce applied to the inverting terminal (-) is compared with the reference voltage of the reference voltage generator 63 and outputs a low level output signal to the microcomputer 30 during the overload operation.

Therefore, during the overload operation of the composite cooker, a low level control signal is applied to the base terminal of the transistor TR1 by the microcomputer 30 so that the transistor TR1 is turned off and the resonance of the cooking means 50 is performed. The transistor TR1 can be safely operated by discharging the voltage charged in the capacitors C1 and C2 to the ground terminal through the discharge part 62 composed of the resistors R1 and R2 and the capacitor C4. .

Meanwhile, as another embodiment of the present invention, there is another embodiment of the switching means denoted by reference numeral 60 of FIG. 2, which will be briefly described below.

Here, since the components except for the switching means 70 are the same as described above, description thereof is omitted.

First, when the input voltage of the commercial AC power output from the AC power input means 1 of the composite cooker is applied to the current detecting means 20 by full-wave rectifying from the rectifying means 10 to DC, the current detecting means 20 In the present invention, a constant DC voltage outputted from the rectifying means 10 detects a change amount of a current input to a load, and outputs the current detection signal to the microcomputer 30, and the microcomputer 30 detects the current. Receives the current detection signal output from the ()) and outputs a high level control signal for driving the cooking means 50 to the transistor TR2 of the switching means 70.

Therefore, when a high level signal is applied to the base terminal of the transistor TR2, the cooking means 50 starts the cooking operation while the transistor TR2 is turned on.

At this time, the resonance voltage Vce generated between the collector of the transistor TR2 and the emitter terminal is applied to the inverting terminal (-) of the comparator COM1 through the voltage divider R3 and R4. In this case, the resonant voltage Vce applied to the inverting terminal (-) is compared with the reference voltage of the reference voltage generator 73, and a low level voltage signal is applied to the non-inverting terminal of the pulse width modulator COM2 during an overload operation. Is applied to +).

Accordingly, the pulse width modulator COM2 compares the voltage signal output to the comparator COM1 with the triangular wave signal of the triangular wave generator 74 to drive the low level drive signal through the driving means 75 during an overload operation. Is outputted to the base terminal of the transistor TR2, the transistor TR2 is turned off, and the voltages charged in the resonant capacitors C1 and C2 of the cooking means 50 are converted into the resistors R3 and R4 and the capacitor C2. The transistor TR2 can be safely operated by discharging it to the ground terminal through the discharge unit 72 formed of ().

As described above, according to the multi-cooker according to the present invention, since the function of the microwave oven or the induction heating cooker can be selected by detecting the amount of change of the current input to the load using the current detecting means, the configuration is simple and the manufacturing cost is high. Inexpensive and excellent effect. Also, it is possible to separate and operate the functions of microwave oven and induction heating cooker by using microcomputer and relay. This is an excellent effect that can ensure the safety of the cooker.

Claims (3)

In a composite cooker capable of cooking food by induction heating or dielectric heating, current detecting means for detecting the amount of change of current inputted from the rectifying means to the load, and induction heating at the time of initial operation of the mixing cooker and switching to the city A microcomputer outputting a control signal to drive the element, and outputting a control signal to select dielectric heating if the current variation is not detected by the current detecting means while the induction heating is selected in this way; A relay means for driving a relay to select induction heating or dielectric heating according to a control signal, and a switching means for driving food switching or induction heating of food by driving a switching element according to a control signal output from the microcomputer. Combined cooker characterized by. 2. The switching circuit according to claim 1, wherein the switching means receives a control signal from the microcomputer and performs a switching operation to drive a load, and resonance capacitors C1 and C2 when the transistor TR1 is turned off. The discharge unit 62 connected to the collector terminal of the transistor TR1, the resonance voltage Vce generated when the transistor TR1 is turned on, and the reference voltage signal of the reference voltage generator to discharge the voltage charged in the Compound cooker, characterized in that consisting of a comparator (COM) to compare. The transistor of claim 1, wherein the switching means receives a control signal from the microcomputer and performs a switching operation to drive a load, and resonance capacitors C1 and C2 when the transistor TR2 is turned off. The discharge unit 72 connected to the collector terminal of the transistor TR2, the resonance voltage Vce and the reference voltage generator 73 generated when the transistor TR2 is turned on so as to discharge the voltage charged in the transistor TR2. A comparator (COM1) for comparing the reference voltage of the signal, and a pulse width modulator (COM2) for modulating the pulse width by comparing the voltage signal from the comparator (COM1) and the triangular wave signal of the reference voltage generator (74); And driving means (75) for driving the transistor (TR2) according to the square wave signal output from the pulse width modulator (COM2).