WO2013027178A2

WO2013027178A2 - Domestic appliance

Info

Publication number: WO2013027178A2
Application number: PCT/IB2012/054234
Authority: WO
Inventors: Daniel Anton Falcon; Jose Maria De La Cuerda Ortin; Pablo Jesus Hernandez Blasco; Sergio Llorente Gil; Paul Muresan; Jose Joaquin Paricio Azcona; Diego Puyal Puente; Magdy Saoudi
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-08-23
Filing date: 2012-08-22
Publication date: 2013-02-28
Also published as: EP2749124A2

Description

Home appliance device

The invention relates to a household appliance device according to the preamble of claim 1.

From the prior art is an induction hob with a

Home appliance device is known, which comprises a trained as an induction heating unit consumer unit. For measuring a high-frequency electric current through the consumer unit has the

Home appliance device on a high-frequency current detection unit.

The object of the invention is in particular to provide a generic household appliance device with an advantageously high reliability in a measurement of a high-frequency electric current. The object is achieved by the features of claim 1 and the method claim 9, while advantageous embodiments and refinements of the invention can be taken from the dependent claims.

The invention is based on a household appliance device with at least one consumer unit and at least one high-frequency current detection unit for measuring a high-frequency electrical current flowing through the consumer unit.

It is proposed that the domestic appliance device has at least one adaptation unit for adaptation to a frequency and / or a maximum amplitude of the current. In this context, a "consumer unit" is to be understood as meaning in particular a preferably electrical unit which has a maximum power consumption of at least 500 W, in particular of at least 1000 W and preferably of at least 1500 W. Preferably, the consumer unit is a High frequency consumer unit and includes a particularly advantageous

Induction heating. A "high-frequency current detection unit" is to be understood as meaning, in particular, an electrical unit which is intended for measuring a high-frequency electrical current and preferably for measuring a time profile of a high-frequency electrical current. or equipped and / or programmed understood. Preferably, the high-frequency current detection unit comprises a measuring point, in particular an inductive measuring loop, and / or an analog-to-digital converter. A "high-frequency electrical current" is to be understood as meaning, in particular, an alternating electrical current having a frequency of at least 500 Hz, in particular of at least 1 kHz, preferably of at least 10 kHz and particularly advantageously of at least 20 kHz an "adaptation unit" is to be understood in particular a unit which is provided, depending on a frequency and / or a maximum amplitude of the high-frequency electrical current make an adjustment of the high-frequency current detection unit, in particular for increasing a measurement accuracy. The

Adaptation unit may be part of the particular

Be high-frequency current detection unit. By such a configuration, an advantageously high reliability in a measurement of a

high-frequency electrical current can be achieved. In particular, operational reliability can be increased by higher reliability of a power measurement. Furthermore, an advantageous adaptation to different consumer units can be made possible. In addition, an adaptation of the high-frequency current detection unit can be made in the event that a high-frequency electrical current is to be measured by a plurality of consumer units connected in parallel.

It is also proposed that the high-frequency current detection unit has at least one current-voltage conversion unit, which is provided for, at least one measuring current in at least one measuring voltage convert. In this context, a "current-voltage conversion unit" should be understood as meaning, in particular, an electrical unit for converting a current signal into a voltage signal The current-voltage conversion unit is preferably designed as a measuring resistor unit and comprises at least one electrical resistance component

Measuring current is an electromagnetically induced current in the measuring loop.

In this way, an advantageous further processing of measurement signals can be made possible. In a preferred embodiment of the invention it is proposed that the

Adaptation unit is provided to the measurement voltage for any

To keep frequencies and / or maximum amplitudes of the current at a fixed interval. Preferably, the interval is determined by a dynamic range of the analog-to-digital converter of the high-frequency current detection unit. As a result, an advantageously high bit accuracy of the analogue

Digital converter can be achieved. Furthermore, an advantageous high signal-to-noise ratio can be achieved.

In a particularly preferred embodiment of the invention

proposed that the matching unit is intended to provide an electrical resistance of the current-voltage conversion unit in

Depending on the frequency and / or the maximum amplitude to change. Advantageously, the adaptation unit for this purpose by a control unit

controlled accordingly. A "control unit" is to be understood in particular as meaning an electronic unit which is intended to control and / or regulate at least one high-frequency unit of the home appliance device. and / or control program

"RF unit" should be understood in particular an electrical unit, which is an oscillating electrical signal, preferably at a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageous of at least 20 kHz and in particular of at most 100 kHz for the

Consumer unit generated. In particular, the radio-frequency unit is intended to provide a maximum electrical power of at least 1000 W, in particular of at least 2000 W and preferably of at least 3000 W, required by the consumer unit. The high-frequency unit comprises in particular at least one inverter, which preferably comprises at least two, preferably in series, bidirectional unipolar switching units, which comprise in particular a transistor and a diode connected in parallel, and particularly advantageously at least one respective connected parallel to the bidirectional unipolar switching units damping capacity, in particular is formed by at least one capacitor. By such a configuration can advantageously be easily made possible adaptation to different frequencies of the electric current.

Advantageously, the current-voltage conversion unit comprises a plurality of resistance components, which are arranged serially and / or in parallel. In this context, a "plurality of resistance components" should be understood as meaning, in particular, at least two resistance components, including, in particular, that the resistance components are arranged "serially and / or parallel"

Resistor components at least two resistance components exist, which are connected in series, and / or at least two resistance components exist, which are connected in parallel. This can be particularly flexible one

Adjustment of a resistance value of the current-voltage conversion unit can be achieved.

If the adaptation unit has at least one switching unit, adaptation to a frequency of the electrical current can be carried out particularly easily. Preferably, the switching unit is designed as a bidirectional and bipolar switching unit and preferably comprises a relay and particularly advantageously a transistor, in particular a MOSFET. Under a "bidirectional and unipolar switching unit" is intended in particular an electrical Switching unit to be understood, which has at least substantially the same electrical resistance value, both in open and closed switch position regardless of a polarity of a voltage applied between an input terminal and an output terminal of the switching unit voltage. In this context, an "input terminal" and an "output terminal" are to be understood in each case as an electrical connection of a switching unit, which differs from a control terminal of the switching unit. By "at least substantially the same electrical resistance value" is meant, in particular, a resistance value which differs from a reference value by at most 10%, at most by 5% and preferably by at most 1%.

In a further embodiment of the invention, it is proposed that the high-frequency current detection unit has a reference potential point different from a ground potential point for setting a working point. In this context, a "ground potential point" is to be understood as meaning, in particular, a point having a potential which corresponds to a ground potential of the household appliance device and preferably of the household appliance

Potential, which in at least one operating state of a

Power supply unit of the home appliance device is provided. This allows an advantageous reliable operation of the

High frequency current detection unit can be achieved.

If the high-frequency current detection unit has at least one measuring point on at least one output line of a high-frequency unit, a measurement of a power of the high-frequency unit can be made directly. In this context, an "output line of a radio-frequency unit" should be understood in particular to be a voltage pick-up of the radio-frequency unit, which in particular is connected to a common contact point of two bidirectional unipolar switching units of the radio-frequency unit is arranged. Preferably, the measuring point is designed as a measuring loop, in particular as a measuring loop with a plurality of windings and particularly advantageously as a coil, which is electromagnetically coupled in at least one operating state with the output line.

Furthermore, a method with a home appliance device with a

Consumer unit proposed in which a consumer unit flowing through high-frequency electrical current is measured, with an adjustment to a frequency and / or a maximum amplitude of the current is made. As a result, an advantageously high reliability can be achieved when measuring a high-frequency electrical current.

Furthermore, a domestic appliance, in particular a hob and preferably an induction hob, proposed with a home appliance device according to the invention. In this way, a domestic appliance can be provided in which an advantageously high reliability of a current measurement and thus

In particular, a performance measurement can be achieved. Furthermore, ease of use can be increased, especially if one

Domestic appliance comprehensive household appliance as a cooking appliance, in particular as a hob and preferably as an induction hob is formed as a

Heating capacity is more reliable adjustable. In the case of an induction hob with inductive cookingware detection taking place at high frequencies, a susceptibility to error of the cookingware detection can advantageously be reduced. Furthermore, an operating frequency band can be extended to high frequencies, in particular to frequencies beyond 75 kHz.

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the descriptions and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Show it:

Fig. 1 is designed as an induction hob and a

Household appliance according to the invention comprising household appliance,

Fig. 2 is a circuit diagram of the home appliance device with a

RF power detection unit

Fig. 3 is a circuit diagram of the high-frequency current detection unit with

an adaptation unit and two parallel connected

Resistance components,

Fig. 4 is a diagram of an alternative

High-frequency current detection unit with a

Matching unit and two serially connected

Resistance components,

Fig. 5 is a diagram of another

High-frequency current detection unit with a

Matching unit and three parallel connected

Resistance components,

6 is a diagram of another

High-frequency current detection unit with a

Matching unit and three serially connected

Resistance components,

7 is a diagram of another alternative

High-frequency current detection unit with a

Matching unit and a plurality of parallel and / or series-connected resistance components and

8 is a diagram of another alternative

High-frequency current detection unit with an alternative

Working point potential.

FIG. 1 shows a domestic appliance designed as an induction hob 38a. The induction hob 38a comprises a hob plate 40a, in particular of a glass ceramic, on which four heating zones 42a are marked in a known manner. The Hob plate 40a is arranged horizontally in an operative state of the induction hob 38a and provided for setting up cooking utensils. Furthermore, on the cooktop panel 40a in a known manner

touch-sensitive controls 44a and display elements 46a of a control and display unit 48a of the induction hob 38a marked. The

Induction hob 38a further comprises a domestic appliance device with two high-frequency units 37a arranged below the hob plate 40a (see Fig. 2). Each of the heating zones 42a is assigned a consumer unit 10a of the household appliance device which is designed as an inductor below the hob plate 40a. Each consumer unit 10a is intended to be known in the art

Way to heat a cooking vessel placed on the hob plate 40a in a region of the associated heating zone 42a by induced eddy currents. For this purpose, the consumer unit 10a is supplied in an operating state by the high-frequency unit 37a with a high-frequency electric current i _{L of} a frequency f and a maximum amplitude l ₀ . A control of

High-frequency units 37a assumes a control unit 50a of

Home appliance device taking into account operating parameters entered by an operator via the operating and display unit 48a. FIG. 2 shows a simplified circuit diagram of the household appliance device. The

Radio frequency units 37a are provided to power the load units 10a in an operating condition. The high-frequency units 37a each include a first insulated-gate bipolar transistor (hereinafter abbreviated to "IGBT") 52a and a second IGBT 54a. Further, the high-frequency units 37a each include a first diode 56a and a second diode 58a. Furthermore, the

High frequency units 37a each have a first capacitor 60a and a second capacitor 62a. In each radio frequency unit 37a is a

Emitter terminal of the first IGBT 52a connected to a collector terminal of the second IGBTs 54a. A collector terminal of the first IGBT 52a is set at a higher potential than an emitter terminal of the second IGBT 54a.

Parallel to the first IGBT 52a are the first diode 56a and the first one Connected capacitor 60a. Parallel to the second IGBT 54a, the second diode 58a and the second capacitor 62a are connected. The first diode 56a and the second diode 58a are each reverse-connected. In one

Operating state of the high-frequency unit 37a, the IGBTs 52a, 54a are alternately opened and closed by the control unit 50a, with each of them

Time is opened at least one of the two IGBTs 52a, 54a. At the emitter terminal of the first IGBT 52a is a high-frequency

Supply potential for the consumer units 10a can be tapped. This supply potential is via a switching arrangement 64 a the

Consumer units 10a supplied. The switching arrangement 64a makes it possible to conductively connect each of the high-frequency units 37a to a first terminal of any one of the load units 10a, and both

Radio frequency units 37a with the first connection of a single

To connect consumer unit 10a. Furthermore, the

Switching arrangement 64a a time-division multiplex operation of one or more

Consumer units 10a at the same time. The switching arrangement 64a comprises a plurality of switching elements 66a arranged in cascade, for which purpose all switch elements 66a appearing appropriate to a person skilled in the art come into question, but preferably electromagnetic relays and particularly advantageously bidirectional and bipolar switching elements

Semiconductor devices, such as TRIACs or MOSFET transistors, constructed. The consumer units 10a designed as inductor coils are paired with a second connection to one of two

Resonance capacitor banks 68a connected. each

Resonant capacitor bank 68a includes a first resonant capacitor 70a and a second resonant capacitor 72a. The second terminals of the pair connected to a resonant capacitor bank 68a

Consumer units 10a are connected to a second terminal of the first

Resonant capacitor 70a and to a first terminal of the second

Resonant capacitor 72a connected. Further, a first terminal of the first resonant capacitor 70a is at the same potential as the collector of respectively first IGBTs 52a of the high-frequency units 37a. A second terminal of the second resonance capacitor 72a is at the same potential as the emitter of the respective second IGBT 54a of the high-frequency units 37a. The home appliance device comprises one for each radio frequency unit 37a

High-frequency current detection unit 12a, which are shown schematically in Fig. 2 as a conductor loop. The high-frequency current detection units 12a are each provided to detect a current i _L and in particular its time course in an output line 36a of the high-frequency unit 37a. The high-frequency current detection units 12a therefore comprise the

Output lines 36a each have an inductive measuring point 34a. As a result, regardless of a switch position of the switching arrangement 64a, the current i _L delivered by the radio-frequency unit 37a can be determined. In the case of a parallel operation of both high-frequency units 37a on a single

Consumer unit 10a, a current through the load unit 10a from a summation of the currents l _L through the output lines 36a of the high-frequency units 37a can be determined.

FIG. 3 shows a simplified circuit diagram of FIG

High-frequency current detection unit 12a. The

High frequency current detection unit 12a includes those as inductive

Coupling unit 74a formed measuring point 34a, a current-voltage conversion unit 16a, an adjustment unit 14a and an analog-to-digital converter 76a. The inductive coupling unit 74a has a coupling coil 78a and an iron yoke 80a. The coupling coil 78a is wound around the output line 36a of one of the high-frequency units 37a. A winding number of

Coupling coil 78a is 200. In operation, a proportional to the current i _L measuring current i _{M is} induced in the coupling coil 78a. The measuring current i _M is converted by the current-voltage conversion unit 16 a into a measuring potential v _M. The measurement potential v _M is then supplied to the analog-to-digital converter 76a, which is the

Digitized measuring potential and finally generates a sampling potential v _s . The sampling potential v _s is processed in the control unit 50 a, wherein one of Timing of the sampling potential v _s in a manner known to a person skilled in an output power of the high-frequency unit 37a is determined.

A first terminal of the coupling coil 78a is connected to an input terminal of the analog-to-digital converter 76a. A second terminal of the coupling coil 78a is connected to a reference potential point 32a. The current-voltage conversion unit 16a comprises two resistance components 18a and 20a. The

Resistor component 18a has an ohmic resistance Ri. The resistance component 20a has an ohmic resistance R ₂ . A respective first terminal of the resistance components 18a, 20a is connected to the

Input terminal of the analog-to-digital converter 76 a connected. A second terminal of the resistance component 18a is connected to the reference potential point 32a. A second terminal of the resistance component 20a is connected to a first terminal of a switching unit 24a. A second terminal of the switching unit 24a is connected to the reference potential point 32a. The reference potential point 32a has an operating point potential V ₀ , which is about a potential value V _cc / 2 above a ground potential of a ground potential point 30a and defines an operating point of the high-frequency current detection unit 12a. Depending on a switch position of the switching unit 24a, the measuring current i _{M flows} through the resistance component 18a or through a

Parallel connection of the resistance components 18a and 20a. When open

Switch position of the switching unit 24a is the following relationship between the measuring potential v _M and the current i _L :

with a gain k, which is defined in particular by the number of turns of the coupling coil 78a. With the switch position of the switching unit 24a closed, v _M = V ₀ + R i x (R ₂ + R _s ) / (R i + R ₂ + R _s ) ^x i L / k with a closing resistance R _{s of} the switching unit 24a, an ohmic

Resistance value with closed switching unit 24a. The switching unit 24a is part of the matching unit 14a. The switching unit 24a with the feature of bidirectional and bipolar switching can be configured as any switching unit 24a that appears appropriate to a person skilled in the art, but is preferably constructed as an electromagnetic relay and particularly advantageously on the basis of MOSFETs or another type of suitable semiconductor device. As a selection criteria for the switching unit 24a are: a maximum voltage between two terminals of the switching unit 24a, a maximum power loss, a frequency bandwidth and the

Closing resistance value R _s and its behavior at different measuring currents i _M and temperatures. The adaptation unit 14a is provided to adapt the high-frequency current detection unit 12a to the frequency f and the maximum amplitude l _{0 of} the current i _L. According to the above formulas, in an operating state, the matching unit 14a holds the measurement potential v _M at a predetermined interval (VUG, V ₀ G)

Potential lower limit VUG and a potential upper limit V ₀ G- The interval (VUG, V ₀ G) is defined by a dynamic range of the analog-to-digital converter 76 a. The switching unit 24a is controlled accordingly by the control unit 50a, specifically in response to a switching frequency of the IGBTs 52a, 54a of the radio-frequency unit 37a. The

Adaptation unit 14a is thus adapted to an electrical

Resistance R of the current-voltage conversion unit 16a as a function of the frequency f and the maximum amplitude l ₀ to change. in the

In the present case, the resistance R is, depending on the switch position of the switching unit 24a

R = R i x (R ₂ + R _s ) / (R i + R ₂ + R _s ) -

Since the maximum amplitude l _{0 of} the current i _L to be expected depends in particular on the frequency f, an advantageously reliable current and current Power measurement over a wide frequency band are possible. Thus, at a relatively low frequency f, the smaller resistance value R = R-ι ^χ (R ₂ + Rs) / (Ri + R ₂ + Rs) is used, while at higher frequencies f the larger resistance value R = R-1 is used. In the present case the following quantities are valid: k = 200, V _cc = 3.3 V, R _s = 0.5 Ω, Ri = 6.6 Ω and R ₂ = 6, 1 Ω.

In Fig. 4 to 8 further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the embodiments, with respect to

Constant components, features and functions on the description of the other embodiments, in particular Figs. 1 to 3, can be referenced. To distinguish the embodiments of the letter a in the reference numerals of the embodiment in FIGS. 1 to 3 by the letters b, c, d, e and f in the reference numerals of the embodiments of FIGS. 4 to 8 replaced. With regard to the same named components, in particular with respect to

Components with the same reference numerals, can in principle be made to the figures and / or the descriptions of the other embodiments, in particular Figs. 1 to 3, referenced. FIG. 4 shows an alternative high-frequency detection unit 12b in which

Resistor components 18b, 20b are arranged in series instead of in parallel. The resistance component 18b has an ohmic resistance value R-1. The resistance component 20b has an ohmic resistance R ₂ . The switching unit 24b has a closing resistance R _s . A first terminal of the resistance component 18b is connected to an input terminal of an analog-to-digital converter.

Translator 76b connected. A second terminal of the resistance component 18b is connected to a first terminal of the resistance component 20b. A second terminal of the resistance component 20b is provided with a

Reference potential point 32b connected to an operating point potential V ₀ . The first terminal of the resistance component 20b is connected to a first terminal of a switching unit 24b. The second port of the

Resistor component 20b is connected to a second terminal of the switching unit 24b connected. With open switch position of the switching unit 24b, the following relationship applies between a measuring potential v _M and a current i _L :

When the switch position of the switching unit 24b is closed, the following applies:

In the present case the following quantities are valid: k = 200, V _cc = 3.3 V, R _s = 0.5 Ω, Ri = 2.8 Ω and R ₂ = 3.8 Ω. It should be noted at this point that the

Switching unit 24b in this embodiment, a higher maximum allowable current must have as in the embodiment of FIG. 3, which is therefore preferred.

FIG. 5 shows a further high-frequency current detection unit 12c which permits a finer adjustment of a resistance value R as a function of a frequency f of a current i _L. In this case, three resistance components 18c, 20c, 22c and two switching units 24c, 26c are used. The

Resistance component 18c has an ohmic resistance R-1. The resistance component 20c has an ohmic resistance R ₂ . The resistive member 22c has an ohmic resistance value R. ₃ The switching units 24c, 26c both have a closing resistance value R _s in a closed state. A first terminal of the resistor components 18c, 20c, 22c is respectively connected to an input terminal of an analog-to-digital converter 76c. A second terminal of the resistance component 18c is connected to a reference potential point 32c having an operating point potential V ₀ . A second terminal of the resistance component 20c is connected to a first terminal of the switching unit 26c. A second terminal of the resistance component 22c is connected to a first terminal of the switching unit 24c. Second terminals of the switching units 24c, 26c are each with the Reference potential point 32c connected. Here are four different ones

Resistance values R can be set:

R = R i x (R ₂ + R _s ) / (R i + R ₂ + R _s ),

R = R i x (R ₃ + R _s ) / (R i + R ₃ + R _s ) and

R = R x (R ₂ + R _s) x (R ₃ + R) / (Ri * (R ₂ + R) + R * (R ₃ + R)

+ (R ₂ + R _s ) x (R ₃ + R _s )) -

FIG. 6 shows a further high-frequency current detection unit 12d with resistance components 18d, 20d, 22d connected in series instead of in parallel. The

Resistor component 18d has an ohmic resistance Ri. The resistance component 20d has an ohmic resistance R ₂ . The resistive component 22d has an ohmic resistance value R. ₃

Switching units 24d, 26d are in a closed state

Closing resistance R _s on. A first terminal of the resistance device 18d is connected to an input terminal of an analog-to-digital converter 76d. A second terminal of the resistance component 18d is connected to a first terminal of the resistance component 20d. A second terminal of the resistance component 20d is connected to a first terminal of the

Resistor component 22d connected. A second connection of the

Resistor component 22d is connected to a reference potential point 32d with an operating point potential V ₀ . The first connection of the

Resistor component 18d is further connected to a first terminal of the switching unit 24d. The second terminal of the resistance component 18d is further connected to a second terminal of the switching unit 24d. The first terminal of the resistance component 20d is further connected to a first terminal of the switching unit 26d. The second port of the

Resistor component 20d is further connected to a second terminal of the switching unit 26d. Again, four different resistance values R can be set: R = R ₃ + 2 x R _s , and

Figure 7 shows a generalized high-frequency current detection unit 12e, wherein a number n ² comes from resistive components 18e, 20e, 22e are used. The resistance components 18e, 20e, 22e have resistance values R with i = 1, n and j = 1, n. The resistance components 18e, 20e, 22e may be arranged both in parallel, as in the case of the two resistance components 18e, 22e, and serially, as in the case of the two resistance components 18e, 20e. A

Matching unit 14e has a number of n ^χ (n + 1) switching units 24e, 26e, 28e. The resistance components 18e, 20e, 22e and the switching units 24e, 26e, 28e are arranged in n identically constructed columns. In each column, a first terminal of the first resistance element 18e is connected to an input terminal of an analog-to-digital converter 76e. A second terminal of the first resistance component 18e is connected to a first terminal of the second resistance component 20e. A second terminal of the second resistance component 20e is connected to a first terminal of the third resistance component, etc. The first terminal of the first

Resistor component 18e is further connected to a first terminal of the first

Switching unit 24e connected. The second port of the first

Resistor component 18e is further connected to a second terminal of the first switching unit 24e. The first connection of the second

Resistor component 20e is further connected to a first terminal of second switching unit 26e. The second port of the second

Resistor component 20e is further connected to a second terminal of second switching unit 26e, etc. A second terminal of the nth resistance component and a second terminal of the nth switching unit are connected to a first terminal of n + 1th switching unit 28e , A second terminal of the (n + 1) th switching unit 28e is connected to a reference potential point 32e having an operating point potential V ₀ . In an alternative Design columns can also have a different number of

Have resistance components and switching units.

In all the previously shown high-frequency current detection units 12a-e, a reference potential point 32a-e is provided with a working point potential V ₀ is provided. A supply voltage of the analog-to-digital converters 76a-e is tapped between a point having a control potential V _cc and a ground potential point 30a-e. The operating point potential V ₀ is replaced by a

Power supply unit of the induction cooktops 38a-e and is half as large as the control potential V _cc . However, it is equally conceivable that a supply voltage of an analog-to-digital converter 76 f between a point with a potential of + V _cc / 2 and another point with a potential of -V _cc / 2 is tapped and that an operating point potential V ₀ a Ground potential corresponds. In the embodiment according to FIG. 8, a supply voltage of an analog-to-digital converter 76f is tapped between a point with a potential of + V _cc / 2 and another point with a potential of -V _cc / 2. A second port of one (n + 1) th

Switching unit 28f of each of the n columns is connected to a ground potential point 30f.

reference numeral

10 consumer unit 60 capacitor

12 high frequency current sense 62 capacitor

unity 64 switching arrangement

14 matching unit 66 switching element

16 current-voltage 68 resonant capacitor bank

change unit

70 resonance capacitor

18 resistance component

72 resonance capacitor

20 resistance component

74 Inductive coupling unit

22 resistance component

76 analog-to-digital converter

24 switching unit

78 coupling coil

26 switching unit

80 iron yoke

28 switching unit

f frequency

30 ground potential point i counter

32 reference potential point

electricity

34 measuring point

IM measuring current

36 output line

lo amplitude

37 radio frequency unit

j counter

38 induction hob

k gain factor

40 hob plate

n number

42 heating zone

R resistance

44 control element

Ri resistance

46 Display element

R ₂ resistance value

48 Control and display unit

R ₃ resistance value

50 control unit

RÜ resistance value

52 IGBT

Rs closing resistance value

54 IGBT

v _M measuring potential

56 diode

Vs sampling potential

58 diode Control potential Operating point potential Potential upper limit Potential lower limit

Claims

claims

1. Home appliance device having at least one consumer unit (1 Oa-f) and at least one high-frequency current detection unit (12a-f) for measuring a consumer unit (10a-f) flowing through high-frequency electric current (i _L ), characterized by at least one matching unit (14a-f ) for adaptation to a frequency (f) and / or a maximum amplitude (l ₀ ) of the current (i _L ).

Domestic appliance device according to claim 1, characterized in that the high-frequency current detection unit (12a-f) has at least one current-voltage conversion unit (16a-f), which is provided, at least one measuring current (i _M ) in at least one measuring potential (v _M ) convert.

Domestic appliance device according to claim 2, characterized in that the matching unit (14a-f) is provided to the

Measuring potential (v _M ) for any frequencies (f) and / or maximum amplitudes (l ₀ ) of the current (i _L ) in a fixed interval (V _UG , V ₀ G) to keep.

Domestic appliance device according to claim 2 or 3, characterized

in that the adaptation unit (14a-f) is provided for assigning an electrical resistance value (R) to the current-voltage conversion unit (16a-f) as a function of the frequency (f) and / or the maximum amplitude (l ₀ ) change.

Home appliance apparatus according to one of claims 2 to 4, characterized in that the current-voltage conversion unit (16a-f) comprises a plurality of resistance components (18a, 20a; 18b, 20b; 18c, 20c, 22c; 18d, 20d, 22d; 18e, 20e, 22e; 18f, 20f, 22f) arranged serially and / or in parallel.

Home appliance device according to one of the preceding claims, characterized in that the adaptation unit (14a-f) has at least one switching unit (24a; 24b; 24c, 26c; 24d, 26d; 24e, 26e, 28e; 24f, 26f, 28f).

Domestic appliance device according to one of the preceding claims, characterized in that the

High-frequency current detection unit (12a-e) one of a

Ground potential point (30a-e) has different reference potential point (32a e) for setting a working point.

High-frequency current detection unit (12a-f) at least one measuring point (34a-f) on at least one output line (36a-f) of a

Radio frequency unit (37a-f) has.

Method with a home appliance device having at least one consumer unit (10a-f), in particular according to one of

preceding claims, in which a high-frequency electrical current (i _L ) flowing through the consumer unit (10a-f) is measured, characterized in that an adaptation to a frequency (f) and / or to a maximum amplitude (l ₀ ) of the current ( i _L ).

10. Domestic appliance, in particular hob, with at least one

Domestic appliance device according to one of claims 1 to 8.