Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/02—Induction heating
  • H05B6/06—Control, e.g. of temperature, of power
  • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

• the invention relates to a household appliance device according to the preamble of claim 1.
• Home appliance device which comprises a trained as an induction heating unit consumer unit.
• a trained as an induction heating unit consumer unit For measuring a high-frequency electric current through the consumer unit has the
• 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.
• the domestic appliance device has at least one adaptation unit for adaptation to a frequency and / or a maximum amplitude of the current.
• 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.
• the consumer unit is a High frequency consumer unit and includes a particularly advantageous
• 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.
• 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.
• Adaptation unit may be part of the particular
• high-frequency electrical current can be achieved.
• operational reliability can be increased by higher reliability of a power measurement.
• an advantageous adaptation to different consumer units can be made possible.
• 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.
• 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.
• 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.
• Adaptation unit is provided to the measurement voltage for any reason.
• the interval is determined by a dynamic range of the analog-to-digital converter of the high-frequency current detection unit.
• Digital converter can be achieved. Furthermore, an advantageous high signal-to-noise ratio can be achieved.
• the matching unit is intended to provide an electrical resistance of the current-voltage conversion unit in
• the adaptation unit for this purpose by a control unit
• 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
• 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.
• the current-voltage conversion unit comprises a plurality of resistance components, which are arranged serially and / or in parallel.
• 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.
• 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.
• 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.
• 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.
• 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%.
• the high-frequency current detection unit has a reference potential point different from a ground potential point for setting a working point.
• 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
• 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.
• 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.
• 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.
• 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.
• 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.
• a domestic appliance in particular a hob and preferably an induction hob, proposed with a home appliance device according to the invention.
• a domestic appliance can be provided in which an advantageously high reliability of a current measurement and thus
• 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.
• a susceptibility to error of the cookingware detection can advantageously be reduced.
• an operating frequency band can be extended to high frequencies, in particular to frequencies beyond 75 kHz.
• Fig. 1 is designed as an induction hob and a
• Household appliance comprising household appliance
• Fig. 2 is a circuit diagram of the home appliance device with a
• Fig. 3 is a circuit diagram of the high-frequency current detection unit with
• Fig. 4 is a diagram of an alternative
• Fig. 5 is a diagram of another
• Matching unit and a plurality of parallel and / or series-connected resistance components
• 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
• 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
• 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 .
• High-frequency units 37a assumes a control unit 50a of
• FIG. 2 shows a simplified circuit diagram of the household appliance device.
• 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 IGBT 52a and a second IGBT 54a.
• High frequency units 37a each have a first capacitor 60a and a second capacitor 62a.
• 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.
• first diode 56a 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
• 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
• 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
• Switching arrangement 64a a time-division multiplex operation of one or more
• 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
• the consumer units 10a designed as inductor coils are paired with a second connection to one of two
• Resonance capacitor banks 68a connected.
• 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
• 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.
• the current i L delivered by the radio-frequency unit 37a can be determined.
• 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.
• 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
• 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.
• 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
• 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.
• the measuring current i M flows through the resistance component 18a or through a
• 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.
• 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
• 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.
• 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
• 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)
• VUG 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.
• Adaptation unit 14a is thus adapted to an electrical
• 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 ) -
• 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.
• 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.
• 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 :
• 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.
• three resistance components 18c, 20c, 22c and two switching units 24c, 26c are used.
• 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.
• 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)
• FIG. 6 shows a further high-frequency current detection unit 12d with resistance components 18d, 20d, 22d connected in series instead of in parallel.
• 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
• 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 .
• 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.
• Resistor component 20d is further connected to a second terminal of the switching unit 26d.
• R resistance value
• 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 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.
• Matching unit 14e has a number of n ⁇ (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
• 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.
• 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 .
• Design columns can also have a different number of
• 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 is half as large as the control potential V cc .
• 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.
• 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.
• Switching unit 28f of each of the n columns is connected to a ground potential point 30f.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Measurement Of Current Or Voltage (AREA)

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• 2012
  • 2012-08-22 WO PCT/IB2012/054234 patent/WO2013027178A2/fr not_active Ceased
  • 2012-08-22 EP EP12777947.8A patent/EP2749124A2/fr not_active Withdrawn

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