EP2200400B1 - Vorrichtung zur Stromversorgung eines Kochgeräts - Google Patents

Vorrichtung zur Stromversorgung eines Kochgeräts Download PDF

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Publication number
EP2200400B1
EP2200400B1 EP09290983A EP09290983A EP2200400B1 EP 2200400 B1 EP2200400 B1 EP 2200400B1 EP 09290983 A EP09290983 A EP 09290983A EP 09290983 A EP09290983 A EP 09290983A EP 2200400 B1 EP2200400 B1 EP 2200400B1
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EP
European Patent Office
Prior art keywords
signal
supply
safety
control
transistor
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English (en)
French (fr)
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EP2200400A1 (de
Inventor
Didier Gouardo
Cédric GOUMY
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FagorBrandt SAS
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FagorBrandt SAS
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Priority to PL09290983T priority Critical patent/PL2200400T3/pl
Publication of EP2200400A1 publication Critical patent/EP2200400A1/de
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    • 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 present invention relates to a device for supplying a heating means of a cooking appliance.
  • This cooking appliance is for example an induction hob and the heating means an inductor.
  • the cooking appliances, and in particular the heating means of the cooking appliance, supplied by an electrical network such as the mains, require safety measures which make it possible to cut the supply of the heating means at any moment.
  • the safety measures of electrical appliances must comply with standards dictated by standardization bodies. In the case of household appliances, and therefore cooking appliances, the safety measures must comply with the EN 60335 standard established by the European Committee for Standardization (CEN).
  • CEN European Committee for Standardization
  • This standard provides for the existence of security measures at least in duplicate, that is to say that at least two means for cutting off the power supply of the heating means are necessary to comply with the standard.
  • control signal is generated by an operation control unit from the power demanded by a user of the cooking appliance.
  • a feeding device comprises a safety control unit adapted to detect risk situations for the user of the cooking appliance and / or for the cooking appliance.
  • the security control unit detects when the temperature of an element of the cooking appliance exceeds the maximum permitted temperature.
  • the security control unit detects a risk situation, it generates information. This information is used to stop feeding the heating means.
  • control signal controlling the supply of the heating means is controlled so as to stop the supply of the heating means.
  • the standard provides for the existence of a second security measure.
  • This second safety measure generally consists of an electromechanical relay arranged upstream of the supply device, that is to say between the electrical network and the supply device of the cooking appliance.
  • a relay has a first position in which it establishes an electrical connection between the cooking appliance and the sector. The electrical apparatus is then powered. The relay has a second position in which it cuts off the power supply to the cooking appliance.
  • the relay is controlled to be positioned in the first position.
  • the relay is in the first position in the case of normal operation of the cooking appliance, and in the second position in the case of situations that may present a risk for a user of the cooking appliance and / or for the cooking appliance.
  • the relay when the cooking appliance reaches a temperature of a value greater than a maximum temperature, the relay is positioned in the second position so as to cut off the power supply of the cooking appliance.
  • the relays are bulky, thus increasing the size and therefore the price of the electronic card comprising such a power supply device.
  • the present invention aims to solve the aforementioned drawbacks and to provide a device for supplying the heating means of a cooking appliance, at low cost, while maintaining safety measures and respecting safety standards.
  • the present invention aims in a first aspect, a device for supplying at least one heating means of a cooking appliance, comprising means for controlling the supply of said at least one heating means.
  • the first control means comprise an interface element and a transfer circuit, said at least one supply signal being a supply signal of said transfer circuit.
  • the second control means is adapted to cut the feed signal of the transfer circuit according to the mode of the second safety control signal.
  • said transfer element receives, as input, switching signals coming from a functional microcontroller and intended to frequency-control said at least one inverter, and generates or not as output, second switching signals as a function of the value of said at least one power signal.
  • the transfer element generates or does not generate the second switching signals, and the inverters are controlled or are not frequency-controlled respectively.
  • the second control means are adapted to cut the frequency control of the inverters.
  • the second safety control signal has a mode representative of a fault state
  • said value of said at least one supply signal is set to a first predetermined value, said second switching signals being cut off.
  • the inverters are not frequency-controlled and do not supply the heating means.
  • said at least one inverter comprises at least one switching means and means for controlling said at least one switching means, said at least one power signal being a power supply signal for the control means said at least one switching means.
  • the second control means cut the supply of the inverters when the second safety control signal has a mode representative of a fault state.
  • said at least one power signal is generated by said second control means.
  • the supply of the inverter is controlled by the generation of the supply signal by the second control means.
  • said first and second security control signals come from a security microcontroller.
  • the safety microcontroller controls the power supply of the inverters, thus avoiding risky situations.
  • the present invention relates to a cooking appliance comprising at least one inductor fed by a feeding device according to the invention.
  • This cooking appliance has characteristics and advantages similar to those described above in connection with the feeding device.
  • the electric cooking appliance is an induction cooktop 10 comprising four cooking hobs F1, F2, F3, F4.
  • Each cooking zone F1, F2, F3, F4 respectively comprises an inductor mounted on a power phase of a power supply 11, typically a mains power supply.
  • each inductor of the firing heaters F1, F2, F3, F4 can in practice be made from one or more coils in which the electric current flows.
  • a control and power control card 12 makes it possible to support all the electronic and computer means necessary for controlling the hob 10.
  • the cooking hobs can also be identified by screen printing vis-à-vis the inductors placed under the cooking surface.
  • the hob 10 also comprises control and interface means 14 with the user, in particular enabling the user to control in power and in duration the operation of each focus F1, F2, F3, F4.
  • inductors I1, I2, I3, I4 are represented at the figure 2 .
  • the power supply of the inductors I1, I2, I3, I4 is controlled by control means 100 comprising inverters 21, 22, 23, 24.
  • a first inverter 21 controls the power supply of a first inductor I1
  • a second inverter 22 controls that of a second inductor I2
  • a third inverter 23 controls that of a third inductor I3
  • a fourth inverter 24 controls that of a fourth inductor I4.
  • inductors and associated inverters can be different.
  • Each inverter 21, 22, 23, 24 can operate from any electronic switching means 31, 32, 33, 34, and for example, from a voltage-controlled transistor type switch, known as IGBT. (acronym for the term "Insulated Gate Bipolar Transistor ").
  • Such an inverter is conventionally used in an induction cooktop and need not be described in more detail here.
  • Each inverter 21, 22, 23, 24 further comprises control means 41, 42, 43, 44 of switching means 31, 32, 33, 34 (IGBT), adapted to generate a control signal (not shown in FIG. figure) controlling said switching means 31, 32, 33, 34.
  • IGBT control means 41, 42, 43, 44 of switching means 31, 32, 33, 34
  • the inverter 21, 22, 23, 24 may comprise one or more IGBTs.
  • the inverter 21, 22, 23, 24 may comprise transistors of the type other than IGBTs.
  • the structure may consist of a single transistor, half-bridge or full-bridge transistors.
  • each inverter 21, 22, 23, 24 is frequency-controlled.
  • This frequency command is generated by a functional microcontroller 40 as a function of the operating power of the inductors I1, I2, I3, I4 controlled by a user of the cooking appliance 10.
  • the functional microcontroller 40 is adapted to control the frequency at which the IGBT transistors 31, 32, 33, 34 of the inverters 21, 22, 23, 24 are conducting or blocking.
  • the functional microcontroller 40 generates, for each inductor I1, I2, I3, I4, a switching signal f1, f2, f3, f4 at a frequency which is a function of the operating power controlled by the user for each cooking zone F1. , F2, F3, F4.
  • the control means 100 of the inverters 21, 22, 23, 24 further comprise first control means 50. These first control means 50 are adapted to stop the control of the inverters 21, 22, 23, 24 as a function of a first safety control signal sc1 from a safety microcontroller 41. This will be described in detail below.
  • Each clipping signal f1, f2, f3, f4 at the output of the functional microcontroller 40 corresponds to a signal at the input of the first control means 50.
  • the interface element 51 and the transfer element 52 of the first control means 50 can be inverted.
  • the first control means 50 comprise an interface element 51 and a transfer element 52.
  • the transfer element 52 receives as input a supply signal vb, as well as the switching signals f1, f2, f3, f4 originating from the microcontroller 40, and outputs second clipping signals f11, f21, f31, f41.
  • the interface element 51 receives the second clipping signals f11, f21, f31, f41 from the transfer element 52, and the first safety control signal sc1 from the safety microcontroller 41, and outputs the frequency control signals f12, f22, f32, f42 from the inverters 21, 22, 23, 24.
  • the second control means 70 receive a second safety control signal sc2 at the input, and output a supply signal vb of the transfer circuit 52.
  • the feed device and the heating means shown in FIG. figure 2 are powered by the mains or mains.
  • the value of the signal voltage from the mains is 230V and the value of the frequency 50 Hz.
  • the voltage and the frequency of the signal coming from the mains may have different values, depending on the electrical network of the mains. country in which we are located.
  • the power supply device comprises in particular means 61 able to lower (possibly), rectify and filter the signal coming from the sector.
  • the switching means 31, 32, 33, 34 are supplied with this supply signal v1, lowered (possibly), rectified and filtered.
  • power signals at different voltage values are generated.
  • two supply signals v2, v3 are generated here having voltage values of 12V and 5V respectively.
  • a second supply signal v2 (here being a voltage of 12V) supplies, among other things, the control means 41, 42, 43, 44, and a third supply signal v3 (here being a voltage of 5V) supplies, among others microcontrollers 40, 41.
  • each control means 41, 42, 43, 44 is supplied with voltage by the second supply signal v2, and in frequency with the frequency control signal f12, f22, f32, f42.
  • the power supply device comprises second control means 70 adapted to cut the frequency control signal f12, f22, f32, f42 when a second safety control signal sc2 originating from the safety microcontroller 41 presents a mode representative of a fault state.
  • the safety microcontroller 41 generates the second safety control signal sc2.
  • the second safety control signal sc2 (similarly as for the first safety control signal sc1) can have two different modes, a first mode in which the second safety control signal sc2 is a dynamic signal sd, and a second mode in which the second security control signal sc2 is a static signal ss.
  • the static signal ss is representative of a fault state or operation.
  • the dynamic signal sd is representative of a normal operating state.
  • the second safety control signal sc2 is a static signal ss.
  • the supply device comprises means for measuring the temperature 81, 82, 83, 84, associated respectively with each inductor I1, I2, I3, I4, in order to measure the temperature of the inductors I1, I2, I3. , I4.
  • the dynamic signal sd is a square periodic signal, presenting in no way limiting a frequency of the order of 1 kHz.
  • the dynamic signal sd may be other types, for example sinusoidal, triangular or non-periodic, for example.
  • the static signal ss can present as a non-limiting example a value between 0 and 5 V.
  • the supply device further comprises temperature measuring means 85 adapted to measure the temperature of the means 61 adapted to lower (possibly), rectify and filter the signal from the sector, as well as means for measuring the temperature 86 adapted to measure the ambient temperature around the safety microcontroller 41.
  • the safety microcontroller 41 can monitor the mode of the safety control signals sc1, sc2, so as to act in the event of a fault state, that is to say when the safety control signals sc1, sc2 are static signals ss.
  • Each temperature measuring means 81 to 86 sends an analog or digital signal to the safety microcontroller 41, indicating the measured temperature.
  • the safety microcontroller 41 analyzes the signals coming from the temperature measuring means 81 to 86 and determines, for example, whether these signals represent temperature values greater or smaller than a predetermined value. This predetermined value represents for example a maximum or minimum temperature value.
  • the first and second safety control signals sc1, sc2 generated by the safety microcontroller 41 are static signals ss, representing a fault state.
  • the first 50 and second 70 control means cut the frequency control signals f12, f22, f32, f42, the inverters 21, 22, 23, 24 not being so frequency controlled.
  • control means, 70, 50 are in duplicate, thus existing redundancy of safety measures, which complies with the EN 60335 standard for safety of cooking appliances.
  • the second control means 70 would cut the frequency control signal f12, f22, f32, f42, and vice versa.
  • the security microcontroller 41 and the functional microcontroller 40 communicate with each other via a serial link 90.
  • This serial link 90 is used by the security microcontroller 41 to inform the functional microcontroller 40 when there is a state of default.
  • the functional microcontroller 40 can act accordingly by cutting the frequency control signals f12, f22, f32, f42. This is still a redundancy of security measures.
  • the figure 3 represents an embodiment of a transfer element 52 used in the first embodiment described in FIG. figure 2 .
  • This transfer element 52 comprises a circuit consisting of transfer gates or transfer circuit 521 (known in English as the " buffer "). It receives as input signals the clipping signals f1, f2, f3, f4 from the functional microcontroller 40 and outputs the clipping signals f11, f21, f31, f41.
  • the transfer circuit 521 is powered by the supply signal vb from the second control means 70.
  • the transfer circuit 521 when the transfer circuit 521 is powered, the input signals are output. In addition, the transfer circuit 521 receives as input cut-off signals SD1, SD2, SD3, SD4 coming from the functional microcontroller 40.
  • the transfer circuit 521 is adapted to cut the switching signals f11, f21, f31, f41 at the output of the transfer circuit 521 when the cut-off signals SD1, SD2, SD3, SD4 have a predetermined value.
  • the transfer circuit 521 establishes the frequency of the switching signals f11, f21, f31, f41 at a value substantially equal to zero.
  • the inverters 21, 22, 23, 24 are not supplied with frequency.
  • the transfer circuit 521 when the transfer circuit 521 is not powered, that is to say that the value of the supply signal vb from the second control means 70 has a value of for example 0 V, the signals of input clipping f1, f2, f3, f4 are not outputted, i.e. the frequency of the second clipping signals f11, f21, f31, f41 have values substantially equal to 0.
  • the second control means 70 output the supply signal vb for supplying the transfer element 52. As described above, this supply signal vb acts directly on the transmission of the switching signals f1. , f2, f3, f4, therefore determining whether the inverters 21, 22, 23, 24 are frequency-powered or not.
  • the value of the supply signal vb is set to a first predetermined value (here 0V) and the second switching signals f11, f21, f31, f41 are off.
  • the value of the supply signal vb is set to a second predetermined value (here 5V) and the second switching signals f11, f21, f31, f41 are not cut off.
  • the second control means 70 comprise a first NPN-type bipolar transistor T1, a second PNP-type bipolar transistor T2, a third NPN-type bipolar transistor T3 and a fourth PNP-type bipolar transistor T4.
  • the base T1b of the first transistor T1 receives the second safety control signal sc2 through an input capacitor C0 connected to its base T1b, the emitter T1e of the first transistor T1 is connected to the reference potential 1, here 0V, and the collector T1c of the first transistor T1 is connected to a first terminal R1a of a first resistor R1, and to the base T2b of the second transistor T2.
  • a second terminal R1b of the first resistor R1 is connected to a first terminal C1a of a first capacitor C1, and a second terminal C1b of the first capacitor C1 is connected to the emitter T2e of the second transistor T2 and to the second supply signal v2.
  • the collector T2c of the second transistor T2 is connected to a second terminal R2b of a second resistor R2 and to a first terminal R3a of a third resistor R3.
  • a first terminal R2a of the second resistor R2 is connected to the reference potential 1.
  • a second terminal R3b of the third resistor R3 is connected to the base T3b of the third transistor T3 and to the base T4b of the fourth transistor T4.
  • the emitter T3e of the third transistor T3 is connected to the third supply signal v3, and the collector T3c of this same transistor T3 is connected to the emitter T4e of the fourth transistor T4.
  • the collector T4c of the fourth transistor T4 is connected to the reference potential 1.
  • the supply signal vb is taken at the collector T3c of the third transistor T3 and at the emitter T4e of the fourth transistor T4.
  • transistors used in the diagram of the figure are transistors having resistances in the same housing.
  • the use of this type of transistor saves space in the electronic card comprising a supply device according to the invention.
  • resistors should be connected across the transistors in the same configuration as that of the diagram of the figures.
  • the second security signal sc2 is a dynamic signal sd (i.e. having rising and falling edges) when there is no fault state, or a static signal ss (having a continuous value, for example 0V, 5V or a value between 0 and 5V), when a fault state is present.
  • the first transistor T1 drives on short pulses determined duration by the input capacitor C0 connected to the base T1b of the first transistor T1.
  • the first capacitor C1 is charged, making the second transistor T2 passing.
  • the third transistor T3 then turns on and the fourth transistor T4 is in the off state. Consequently, the supply signal vb at the output of the second control means 70 has, in this example, a value substantially equal to 5V (second predetermined value).
  • the output power signal vb has, in this example, a value substantially equal to 0V (first predetermined value).
  • the values of the first capacitor C1, the input capacitor C0 and the resistances in the case of the first transistor T1 are determined as a function of the value of the frequency of the dynamic signal sd.
  • the figure 5 represents a portion of the circuit adapted to implement the first control means 50 adapted to stop the control of the inverters 21, 22, 23, 24 when the first safety control signal sc1 has a value representative of a fault state.
  • the first safety control signal sc1 can be a dynamic signal sd or a static signal ss, in this example.
  • the first safety control signal sc1 is a static signal ss
  • the safety control signal sc1 is a dynamic signal sd.
  • the interface element 52 of the first control means 50 comprises a fifth PNP bipolar transistor T5, a sixth NPN bipolar transistor T6, and a seventh NPN-type transistor T7.
  • the first safety control signal sc1 is connected to the base T5b of the fifth transistor T5 through a second input capacitor C02, the transmitter T5e receives the third supply signal v3, here of 5 V, the collector T5c is connected to a first terminal R4a of a fourth resistor R4, and to the base T6b of the sixth transistor T6.
  • a second terminal R4b of the fourth resistor R4 is connected to a first terminal C2a of a second capacitor C2, a second terminal C2b of the second capacitor C2 being connected to the reference potential 1, here of 0V.
  • the emitter T5e of the fifth transistor T5 is furthermore connected to a first terminal R5a of a fifth resistor R5, a second terminal R5b of the fifth resistor R5 being connected to the collector T6c of the sixth transistor T6 and to the base T7b of the seventh transistor T7.
  • the emitter T7e of the seventh transistor T7 is connected to the reference potential 1, and the collector T7c of this same transistor T7 is connected to the cathodes D1a, D2a, D3a, D4a, of the diodes D1, D2, D3, D4.
  • the anodes D1b, D2b, D3b, D4b are connected to the interface element outputs 50 respectively corresponding to the frequency control signals f12, f22, f32, f42, of the inverters 21, 22, 23, 24.
  • the fifth transistor T5 receives at its base T5b voltage pulses.
  • the transistor T5 is then in the on state for intermittent periods, that is to say that whenever the safety control signal sc1 has a rising edge, this charges the second input capacitor C02 and causes the conduction of the fifth transistor T5.
  • the second capacitor C2 is charged, turning on the sixth transistor T6.
  • the seventh transistor T7 is then blocked, and the cathodes of the diodes D1, D2, D3, D4 remain floating, not acting on the frequency control signals f12, f22, f32, f42.
  • the first safety control signal sc1 is a static signal ss
  • the fifth transistor T5 is off
  • the second capacitor C2 is discharged
  • the sixth transistor T6 is off.
  • the seventh transistor T7 then turns on, which causes the conduction of the diodes D1, D2, D3, D4, and consequently the frequency of the frequency control signals f12, f22, f32, f42, at the output of the first control means. 50 is set to a value substantially equal to 0.
  • the frequency control signals f12, f22, f32, f42, inverters 21, 22, 23, 24 are cut, the inductors I1, I2, I3, I4 are not powered.
  • the values of the second capacitor C2, the second input capacitor C02, and the resistors included in the case of the fifth transistor T5 are determined as a function of the value of the frequency of the dynamic signal sd.
  • this embodiment comprises a safety microcontroller 41, a functional microcontroller 40, four inductors I1, I2, I3, I4, four inverters 21, 22, 23, 24 (IGBTs 31, 32, 33, 34 and four IGBT control means 41, 42, 43, 44), two power supplies at different values generated from the mains supply, means 61 adapted to lower (possibly), rectify and filter the signal from the mains, as well as means for measuring the temperature 81 to 86.
  • the first control means 50 are similar to the control means 50 of the first embodiment, that is to say they are adapted to cut the frequency control signals f12, f22, f32, f42 according to a first safety control signal sc1 from the safety microcontroller 41.
  • the first control means 50 ' comprise a transfer element 52' adapted to transmit the clipping signals f1, f2, f3, f4 from the functional microcontroller 40 to the interface element 51 '.
  • the supply of the transfer element 52 ' is implemented by a supply signal v3, similar to the third supply signal used in the first embodiment described (here 5 V).
  • the second control means 70 'receive a second safety control signal sc2 of the safety microcontroller 41, similar to that of the first embodiment.
  • the second control means 70 ' are powered by a second supply signal v2 (here 12 V), similar to the second supply signal used in the first embodiment described.
  • the second control means 70 'generate at the output a supply signal vc corresponding to the supply signal of the control means 41, 42, 43, 44 of the inverters 21, 22, 23, 24.
  • the second control means 70 when the second safety control signal sc2 has a value representative of a fault state, the second control means 70 'intersects the feed signal vc means of control 41, 42, 43, 44.
  • control means 41, 42, 43, 44 do not generate a control signal of the switching means 31, 32, 33, 34, and the inductors I1, I2, I3, I4 are not powered.
  • the interface element 70 comprises an eighth P-type Mosfet transistor T8.
  • the gate T8g of this transistor T8 is connected to the second terminal R6b of the sixth resistor R6 and the first terminal R7a of the seventh resistor R7.
  • the source T8s is connected to the input supply signal v2, and the drain T8d is connected to the control signal vc of the corresponding IGBT 31, 32, 33, 34.
  • the source T8s of the eighth transistor T8 is further connected to a first terminal R6a of a sixth resistor R6, a second terminal R6b of this resistor R6 being connected to a first terminal R7a of a seventh resistor R7 and to a first terminal C3a of a third capacitor C3.
  • a second terminal C3b of the third capacitor C3 is connected to the reference potential 1, and a second terminal R7b of the seventh resistor R7 is connected to the collector T9c of a ninth transistor T9.
  • the ninth transistor T9 is a bipolar transistor of the NPN type.
  • the emitter T9e of the ninth transistor T9 is connected to the reference potential 1, the base T9b being connected to first terminals R8a, R9a of the eighth and ninth resistors R8, R9 respectively.
  • a second terminal R8b of the eighth resistor R8 is connected to a first terminal C03a of a third input capacitor C03, a second terminal C03b of this capacitor C03 receiving the second safety control signal sc2.
  • a second terminal R9b of the ninth resistor R9 is connected to the reference potential 1.
  • the second safety control signal sc2 is a dynamic signal sd
  • the voltage pulses on the base T9b of the ninth transistor T9 cause them to lead (or to be in the on state) for intermittent periods.
  • the third capacitor C3 is then discharged and the eighth transistor T8, having at its gate a voltage close to 0V, is on, therefore the supply signal vc at the output is equivalent to the second supply signal v2, that is, that is, the value of the supply signal vc is substantially equal to 12V in this example.
  • control means 41, 42, 43, 44 of the switching means 31, 32, 33, 32 are powered and operate normally. Consequently, the inverters 21, 22, 23, 24 supply the inductors I1, I2, I3, I4.
  • the ninth transistor T9 is still in the off state, the third capacitor C3 is charged by means of the sixth resistor R6.
  • the gate T8g of the eighth transistor T8 has a value potential substantially equal to the value of the second supply signal v2 (12V) and is thus blocked. Consequently, there is no voltage at the output of the second control means 70 '.
  • control means 41, 42, 43, 44 of the switching means 31, 32, 33, 34 are not powered, not being able to supply the inductors I1, I2, I3, I4.
  • the values of the third input capacitor C03, the third capacitor C3 and the eighth resistor R8 are determined as a function of the value of the frequency of the dynamic signal sd.
  • the supply of the inverters in a cooking appliance can be controlled according to the safety control signals, so as to stop the supply of the inductors in the event of a fault condition. This being implemented with a reduced cost.
  • the position of the interface element and the transfer circuit of the first control means can be reversed.
  • inductors and inverters may be different.
  • the feed device can be used in other cooking appliances, such as an oven.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Safety Devices In Control Systems (AREA)
  • Vending Machines For Individual Products (AREA)
  • Inverter Devices (AREA)
  • Frying-Pans Or Fryers (AREA)
  • Cookers (AREA)
  • General Preparation And Processing Of Foods (AREA)

Claims (8)

  1. Vorrichtung zur Versorgung mindestens eines Heizmittels (I1, I2, I3, I4) eines Kochgeräts (10), mit Mitteln (100, 100') zur Steuerung der Versorgung des mindestens einen Heizmittels (I1, I2, I3, I4), dadurch gekennzeichnet, dass die Steuermittel (100, 100') mit mindestens einem Versorgungssignal (vb, vc) versorgt werden und
    - mindestens einen frequenzgesteuerten Wechselrichter (21, 22, 23, 24),
    - erste Kontrollmittel (50, 50'), die die Steuerung des mindestens einen Wechselrichters (21, 22, 23, 24) ausschalten können, wenn ein erstes Sicherheitskontrollsignal (sc1) einen für einen Fehlerzustand repräsentativen Modus aufweist, umfassen und
    dass die Versorgungsvorrichtung zudem zweite Kontrollmittel (70, 70') umfasst, die mindestens eines von dem mindestens einem Versorgungssignal (vb, vc) der Steuerungsmittel (100) sperren können, wenn ein zweites Sicherheitskontrollsignal (sc2) einen für einen Fehlerzustand repräsentativen Modus aufweist.
  2. Versorgungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die ersten Kontrollmittel (50) ein Schnittstellenelement (51) und ein Transferelement (52) umfassen, wobei mindestens ein Versorgungssignal (vb) ein Versorgungssignal des Transferelements (52) ist.
  3. Versorgungsvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Transferelement (52) am Eingang Abschaltsignale (f1, f2, f3, f4) empfängt, die aus einem funktionalen Mikrocontroller (40) stammen und zur Frequenzsteuerung des mindestens einen Wechselrichters (21, 22, 23, 24) bestimmt sind, und am Ausgang zweite Abschaltsignale (f11, f21, f31, f41) in Abhängigkeit des Wertes des mindestens einen Versorgungssignals (vb) erzeugt oder nicht.
  4. Versorgungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass, wenn das zweite Sicherheitskontrollsignal (sc2) einen für einen Fehlerzustand repräsentativen Modus aufweist, der Wert des mindestens einen Versorgungssignals (vb) auf einen ersten vorgegebenen Wert festgelegt ist, wobei die Schaltsignale (f11, f21, f31, f41) gesperrt sind.
  5. Versorgungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der mindestens eine Wechselrichter mindestens ein elektronisches Schaltmittel (31, 32, 33, 34) und Mittel zum Steuern des mindestens einen Schaltmittels (41, 42, 43, 44) umfasst, wobei das mindestens eine Versorgungssignal (vc) ein Versorgungssignal der Steuermittel (41, 42, 43, 44) des mindestens einen Schaltmittels (31, 32, 33, 34) ist.
  6. Versorgungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das mindestens eine Versorgungssignal (vc) durch die zweiten Kontrollmittel (70') erzeugt ist.
  7. Versorgungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste und zweite Sicherheitskontrollsignal (sc1, sc2) von einem Sicherheitsmikrocontroller (41) stammt.
  8. Kochgerät, insbesondere Induktionskochfeld, dadurch gekennzeichnet, dass es mindestens einen Induktor (I1, I2, I3, I4) umfasst, der durch eine Versorgungsvorrichtung nach einem der Ansprüche 1 bis 7 versorgt wird.
EP09290983A 2008-12-22 2009-12-21 Vorrichtung zur Stromversorgung eines Kochgeräts Active EP2200400B1 (de)

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FR0858977A FR2940583B1 (fr) 2008-12-22 2008-12-22 Dispositif d'alimentation d'un appareil de cuisson

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US5408073A (en) * 1993-02-20 1995-04-18 Samsung Electronics Co., Ltd. Overheat prevention circuit for electromagnetic induction heating cooker
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ATE517540T1 (de) 2011-08-15
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PL2200400T3 (pl) 2011-12-30
EP2200400A1 (de) 2010-06-23
FR2940583B1 (fr) 2010-12-31

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