DE19963079C2 - electric stove - Google Patents

Description

The invention relates to an electric cooker with a Oven and at least one hotplate, each with a heater are heated, and with a Leis processing part for generating an for supplying an In suitable medium-frequency altern selstromes.

The oven and the hotplates of conventional electric cookers are usually used with electrical resistance Heated heaters. These are usually un indirectly via the one provided by the power grid 230 V / 50 Hz or 400 V / 50 Hz AC voltage supplied. Anstel le the use of a resistance heater for the It is also known to use hotplates with a Induction heating device to heat. Such an induc tion heating device includes a power section for generation against a medium-frequency alternating current with one in the middle frequency range of about 15-75 kHz, with one induct arranged below the cooking zones tion coil is fed. Since also in electric stoves with In duction hobs heating the oven with con conventional resistance heating devices must both cables are laid in the electric cooker, one conventional AC voltage of 230/400 V and 50 Hz Ren, as well as cables are laid, which are for the induction coils  required medium frequency voltage lead ren.

DE 26 59 877 A1 is an induction heating device known with an energy source with which a signal in Ultrasonic range can be generated, which excites a Induction coil is used and in a DC voltage for connection control of a magnetron is implemented. GB 2 170 903 A shows a cooking device with a hotplate induction heater including switch and control module and a conventional roasting oven. In US 3,790,735 is an induction heated oven described.

The invention has for its object an electric cooker specify, the structure of which is simplified if next to an induction heater also a contra stand heater is available.

The stated object is achieved according to the invention with an electric cooker with the features of claim 1. Because the power section to generate one for the supply an induction heating device suitable medium frequency th alternating current above the mains frequency for supply all other heating devices of the oven with the for Heating required electrical power provided the wiring used for heating the entire ten electric stoves with regard to the requirements for e Electrical isolation can be simplified because an electrical voltage with a higher frequency is less dangerous to touch is.  

An electric cooker according to the invention is particularly then an advantage if at least one hotplate and / or the The oven can be heated inductively.

Alternatively, the oven can also have a counter stand heater to be heated, which also to the a medium-frequency voltage generating power unit closed is.

In a further advantageous embodiment of the invention is in an oven that doubles as a microwave oven serves, the microwave generator for its power supply via a high-voltage transformer with rectification also connected to the power section.

In particular, the power section is also white for supply tere electrical consumer, for example time switch, Lighting provided. In this embodiment, the complete wiring within the oven by using lines carrying alternating current.

A controllable converter is preferably used as the power unit ter provided. This makes it possible in a particular preferred embodiment of the invention a Steuereinrich to use device that ver a sequential connection various heating devices and / or consumers to the Power section with one depending on the respective power requirement dependent clock duration and clock rate.

To further explain the invention, the Ausfü Example of the drawing referenced.  

Show it:

Fig. 1 is an electric cooker according to the invention in a schematic principle sketch

Fig. 2 shows an alternative arrangement of an induction coil for heating the oven.

Referring to FIG. 1, the electric cooker includes an oven 2, and a cooker or a hob 4, comprising a plurality of cooking points 6. The hotplates 6 are inductively heated in the exemplary embodiment, each hotplate 6 being assigned an induction heating device 8 (induction coil). A power part 10 connected to the mains voltage U (induction generator) generates a medium-frequency alternating current. This power unit 10 now supplies both the induction coils 8 of the hotplates 6 and a resistance heating device 12, which is exemplified as a bottom heat radiator, for heating the interior of the oven 2 .

Instead of a conventional resistance heating device, an induction heating device can also be provided for the oven 2 , in which an external induction coil 15 a, shown in broken lines in the figure, either an induction heatable heater 14, also shown in broken lines, or an inductive heater 14 inserted in the oven 2 heated cooking vessel, as is known, for example, in European patent application 0 464 390 A2, heated.

The oven 2 can also be designed as a microwave oven, as illustrated in the figure by a micro wave generator 16 . The high-voltage transformer of the microwave generator 16 is just supplied by the power unit 10 with medium-frequency AC voltage.

Representative of the other electrical consumers usually housed in an electric cooker, the figure shows a consumer 18 on the control panel, for example a timer, and an electric motor 20 which drives an oven fan 22 . This electric motor 20 is supplied directly from the power part 10 .

As a power section 10 , a controllable converter is provided, the output power of which is controlled by a control unit 100 . With the help of the control unit 100 , the individual consumers / heating devices are connected to the power part 10 with a cycle duration and cycle rate dependent on the respective power requirement, as is explained in more detail, for example, in EP 0 286 044 B1.

In the advantageous embodiment according to FIG. 2, the baking oven 2 is heated directly with an induction coil 15 b wound around the oven made of iron sheet de.

LIST OF REFERENCE NUMBERS

2

oven

4

hob

6

cooking

8th

induction coil

10

power unit

12

Resistive heater

14

inductively heatable radiator
15a, b induction coil

16

microwave generator

18

consumer

20

electric motor

22

oven fan

100

control unit
U mains voltage

Claims (9)

1. electric stove with
an oven ( 2 ) and at least one hotplate ( 6 ), each of which can be heated with a heating device ( 8 , 12 , 14 , 15 a, 15 b, 16 ), the at least one of which is a resistance heating device ( 12 ), and
a power section ( 10 ) for generating a medium-frequency alternating current suitable for supplying an induction heating device ( 8 ) above the mains frequency, which is provided for supplying all heating devices ( 8 , 12 , 14 , 15 a, 15 b, 16 ). 2. Electric cooker according to claim 1, the at least one cooking point ( 6 ) is inductively heated. 3. Electric stove according to claim 1 or 2, the oven ( 2 ) with a resistance heating device ( 12 ) can be heated. 4. Electric stove according to claim 1 or 2, the oven ( 2 ) is inductively heated. 5. Electric cooker according to one of the preceding claims, with a microwave generator ( 16 ) for heating a baking oven ( 2 ), which is supplied for its power supply with the power part ( 10 ) generated by Lei. 6. Electric stove according to one of the preceding claims, wherein the alternating current generated with the power section ( 10 ) is also provided for supplying further electrical consumers ( 18 , 20 ). 7. Electric cooker according to one of the preceding claims, in which a controllable converter is seen as the power section ( 10 ). 8. Electric cooker according to claim 7, with a Steuereinrich device ( 100 ) for sequentially connecting various heating devices ( 8 , 12 , 14 , 15 a, 15 b, 16 ) and / or consumers ( 18 , 20 ) to the power section ( 10 ) A cycle duration and cycle rate that depend on the respective power requirement. 9. Electric cooker according to one of the preceding claims, in which the alternating current generated by the power section ( 10 ) has a frequency in the range from 15 to 75 kHz.