JPS6331518Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite cooking device that includes an induction heater on the top plate side of the dielectric heater.

Traditionally, microwave ovens, which are dielectric heaters that use microwaves emitted from a magnetron as heating energy, and electromagnetic cookers, which are induction heaters that use induction heating coils, have been combined to make common parts, save space, and make them easier to use. A composite cooker in which an induction heater is placed on the top plate side of the dielectric heater has been proposed from the viewpoint of efficiency.

In this case, since the induction heater is installed integrally on the top plate side of the dielectric heater, when the door that opens and closes when putting food in and out of the dielectric heater is operated, the food being cooked on the top can be opened and closed. There was a risk of burns due to food particles flying or boiling over, and there were safety concerns.

The present invention has been made in view of the above-mentioned points, and aims at safety by stopping the operation of the induction heater when the door of the induction heater is opened. In order to achieve the above object, the present invention has a high frequency converter that converts a commercial frequency power source into a high frequency, a high frequency converter that has a primary winding connected to the output of the high frequency converter, a secondary winding, and a DC control winding. In a composite cooker in which two transformers are connected in parallel and a dielectric heating circuit and an induction heating circuit are connected to each secondary winding, the output of a DC control circuit that controls the output of the secondary winding is stopped. The present invention is characterized in that a door switch of a dielectric heater equipped with the dielectric heating circuit described above is used as the switch means. Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an external perspective view of a composite cooking device according to an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of the composite cooking device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a composite cooking device main body consisting of a dielectric heater 3 having a heating chamber 2 and an induction heater 4 disposed on the top plate side of the dielectric heater 3. 5 is a door for opening and closing the heating chamber 2, and 6 is an operating section for operating the dielectric heater 3 and induction heater 4. 7 is a commercial frequency power supply, 8 is a main power switch, 9 is a commercial frequency (AC 100V50/60
Hz) to a high frequency (20 to 30 KHz), and its output terminals 10 and 11 are connected to two high frequency transformers 12 and 13. These high frequency transformers 12 and 13 have secondary windings 16 and 17 connected to a dielectric heating circuit 14 and an induction heating circuit 15, respectively, a control circuit 18 configured as a DC constant current circuit, a switch 19 and a switching circuit 20. Control windings 21, 22 connected via
It is equipped with In addition, 23 is a high frequency transformer 12
This is a secondary winding for low voltage output provided in the control circuit 18, and is used as a substitute for the transformer that constitutes the DC power supply of the control circuit 18. The switch 19 is connected to the output side of the control circuit 18, and is a door switch that opens and closes in conjunction with opening and closing the door 5 of the dielectric heater 3.

Next, according to the composite cooker having the circuit configuration as described above, the desired AC power is supplied from the commercial frequency power source to the high frequency converter 9 by turning on the main power switch 8, which is closed by the closing operation of the cooking switch (not shown). Supplied. In this case, when the door of the dielectric heater 3 is closed, the door switch 19 is closed and the direct current is transmitted from the control circuit 18 to the switching circuit 20.
Since the direct current flows through the control windings 21 and 22, a current proportional to this direct current flows through the secondary windings 16 and 1.
7, the outputs of the dielectric heating circuit 14 and the induction heating circuit 15 are controlled. The switching circuit 20 changes the heating output of the dielectric heater 3 and the induction heater 4 from 0 to 4 according to the switching ratio within the specified power.
It can be adjusted arbitrarily within a range of 100%, for example, the output when both heaters are driven continuously can be adjusted to 100%.
In this case, the output of the dielectric heater 3 is set to 30%, and the output of the induction heater 4 is set to 70%, so that both heaters can be used at the same time.

Now, when cooking is performed by operating the dielectric heater 3 and the induction heater 4 at the same time in this way, the dielectric heater 3 uses microwaves generated from a well-known magnetron, and uses a heating coil. Since the usage time is generally shorter than that of the induction heater 4, the door 5 of the induction heater 3 may be closed while the induction heater 4 is cooking.
In this invention, when the door 5 is opened, the switch 19 connected to the output side of the control circuit 18 is opened at the same time, so the control current is reduced. The magnetic flux becomes zero, and the magnetic flux does not interlink with the secondary windings 16 and 17 connected to the dielectric heating circuit 14 and induction heating circuit 15, and power is not transmitted to these dielectric heating circuit 14 and induction heating circuit 15. The operation of both heaters 3 and 4 is completely stopped. Therefore, when the door 5 of the dielectric heater 3 is opened, it is safe because the food does not fly or boil over when the food being cooked is taken out from the induction heater 4.

As explained above, the present invention includes an induction heater on the top plate side of the dielectric heater, a high frequency converter that converts commercial frequency power into high frequency, and a primary winding connected to the output of the high frequency converter. Two high-frequency transformers having a secondary winding and a DC control winding are connected in parallel, and a dielectric heating circuit of the dielectric heater and an induction heating circuit of the induction heater are connected to each secondary winding. In a composite cooking device connected to a control circuit that controls the outputs of the dielectric heating circuit and the induction heating circuit by controlling the DC current flowing through each DC control winding in simultaneous use within a specified power, the control circuit A switch is connected between the control circuit and each of the DC control windings to stop the DC current flowing from the control circuit to each of the DC control windings, and the door switch of the dielectric heater is used as the switch. When a heater and an induction heater are used at the same time and the door of the heating chamber of the dielectric heater is opened to put food into the heating chamber or to take out the food after cooking, the dielectric heater and The power to the induction heater can be cut off reliably.
It is extremely safe as there is no chance of accidental heating of the dielectric heater, boiling over or flying of the food being cooked in the induction heater when the door of the heating chamber of the dielectric heater is open. It is possible to provide a highly complex cooker.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a composite cooking device according to an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of the composite cooking device according to an embodiment of the present invention. 1... Composite cooker, 3... Dielectric heater, 4...
Induction heater, 5... Door, 9... High frequency converter, 14... Dielectric heating circuit, 15... Induction heating circuit, 16, 17... Secondary winding, 18... Control circuit, 19... Door switch , 20... switching circuit,
21, 22...control winding.

Claims (1)

[Scope of utility model registration request] The dielectric heater has an induction heater on the top plate side, a high frequency converter that converts commercial frequency power into high frequency, a primary winding connected to the output of the high frequency converter, a secondary winding, and a DC control winding. Two high-frequency transformers are connected in parallel, and the dielectric heating circuit of the dielectric heater and the induction heater of the induction heater are connected to each secondary winding, and a DC current is applied to each DC control winding. In a composite cooker connected to a control circuit that controls the outputs of the dielectric heating circuit and the induction heating circuit by controlling the outputs of the dielectric heating circuit and the induction heating circuit by using them simultaneously within a specified power, between the control circuit and each of the DC control windings. A combination cooking appliance characterized in that a switch is connected to the control circuit to stop the direct current flowing to each of the DC control windings, and a door switch of the dielectric heater is used as the switch.