**CIRCUIT DEVICE FOR A COOKING DEVICE, IN PARTICULAR COOKING HOB, MORE IN PARTICULAR INDUCTION COOKING HOB AND COOKING DEVICE, IN PARTICULAR COOKING HOB, MORE IN PARTICULAR INDUCTION COOKING HOB**

NOSTRO MASSIMO (IT)

ZANGOLI MASSIMO (IT)

URGESE EMANUEL (IT)

MENGOZZI ALAN (IT)

*;*

**H05B1/02**

**H05B6/06**EP2007174A1 | 2008-12-24 | |||

FR2875370A1 | 2006-03-17 | |||

EP3557753A1 | 2019-10-23 | |||

US20110147375A1 | 2011-06-23 | |||

DE102005044466A1 | 2007-03-22 |

C1aims 1. Circuit device (1) for a cooking device, in particular cook- ing hob, more in particular induction cooking hob, compris- ing - at least two, in particular two, three or at least three power units (P1, P2, .. PN), each power unit supplied with electrical power by a different mains current phase (L1, L2, .. LN), - wherein each power unit (P1, P2, .. PN) comprises frequency converting means (G11 .. GNM), each for supplying at least one induction element with electrical power to generate heating power, - wherein each power unit (P1, P2, .. PN) comprises at least one current conversion unit (C1 .. CN) for converting an in- put direct or alternating current into one, at least one, two or at least two output direct currents, - wherein each power unit (P1, P2, .. PN) comprises at least one load or at least two loads (D11 .. DN2), in particular one or more low-power loads and/or control units, supplied or to be supplied with electrical power by the output direct current, an output direct current or the output direct cur- rents from the current conversion unit, - wherein a first power unit (P1) comprises a first current conversion unit (C1), in particular for converting an alter- nating current from a first mains current phase (L1) into one, at least one, two or at least two first output direct currents (I11..IN2), - wherein by the first output direct current or one of the first output direct currents (I12) of the first power unit (P1), at least a second current conversion unit (C2) of a second power unit (P2) is supplied for converting the first output direct current (I12) into one, at least one, two or at least two second output direct currents. 2. Circuit device according to claim 1, - wherein at least one or each of the current conversion units (C1 .. CN) is an insulated current conversion unit, in par- ticular an insulated AC/DC conversion unit (C1) and/or an insulated DC/DC conversion unit (C2 .. CN). 3. Circuit device according to any of the preceding claims, - wherein the first current conversion unit (C1) is an AC/DC converter that outputs one, at least one, two or at least two direct voltages, in particular at least two different direct voltages, for example 5V and 18V, and/or currents from the first mains current phase (L1), in particular from a single phase-neutral AC voltage or from a phase-phase AC voltage. 4. Circuit device according to any of the preceding claims, - wherein the first current conversion unit (C1), in particu- lar by supplying at least a second current conversion unit (C2) and/or a third current conversion unit (C3), generates supply voltages for multiple loads, in particular multiple low power loads and/or control units, in particular on at least a second power unit (P2) and/or a third power unit (P3) or each power unit (P1 .. PN) and/or referred to dif- ferent mains current phases (L1, L2, .. LN) and/or to dif- ferent phase-neutral voltages or to different phase-phase AC voltages. 5. Circuit device according to any of the preceding claims, - wherein at least one of the current conversion units (C1 .. CN), in particular the or at least one current conversion unit (C2, C3) of the second power unit (P2) and/or a third power unit (P3), is or are DC/DC conversion units. 6. Circuit device according to any of the preceding claims, - wherein each power unit (P1 .. Pn) comprises at least one conversion unit or only a single current conversion unit (C1 .. CN), in particular a single or at least one low power current conversion unit, for supplying currents and/or volt- ages to the loads, in particular the low power loads. 7. Circuit device according to any of the preceding claims, - wherein only the first current conversion unit (C1) is sup- plied by a mains current phase (L1), and the second current conversion unit (C2) and/or third current conversion unit (C3) is/are only supplied by the first current conversion unit (C1). 8. Circuit device according to any of the preceding claims, - wherein at least one or each current conversion unit (C1 .. CN) outputs at least one output voltage, in particular one, two, at least two, three or at least three different output voltages, in particular for supplying different loads. 9. Circuit device according to any of the preceding claims, - wherein the first power unit (P1) is electrically connected with each of the other power units (P2 .. PN), in particular with the second power unit (P2) and/or third power unit (P3), for supplying voltages for loads, in particular low power loads and/or control units, in particular on each power unit (P1 .. PN) and/or power units referred to differ- ent mains current phases (L1 .. LN) and/or to different phase-neutral voltages and/or to different phase-phase volt- ages. 19 10. Circuit device according to any of the preceding claims, - wherein the total power from the frequency converting means (Gil .. GNM) of each mains current phase (L1 .. LN) is lim- ited by a control unit to a predetermined maximum power, which in particular limits the individual power of each fre- quency converting means (Gil .. GNM) to ensure that total power is below the rated power of each mains current phase (L1 .. LN). 11. Circuit device according to any of the preceding claims, - comprising induction elements, wherein each power unit (P1 .. PN) supplies or is configured to supply at least one in- duction element with electrical power by a frequency con- verting means (G1M .. GNM). 12. Circuit device according to any of the preceding claims, - wherein on each power unit (P1 .. PN), by a different cur- rent phase (L1 .. LN), one, at least one, two, at least two, three, at least three, four or at least four frequency con- verting means (G1M .. GNM) are supplied with electrical power. 13. Circuit device according to any of the preceding claims, - wherein a frequency converting means (G1M .. GNM) is a means or generator for converting an input current with an input frequency, in particular between 45Hz and 130Hz, more in particular 50Hz or 65Hz, into an output current with a high frequency, in particular with a frequency between 10kHz and 100kHz. 14. Circuit device according to any of the preceding claims, - wherein a frequency converting means (G1M .. GNM) comprises at least one, in particular common, rectifying means and/or, in particular in series, at least one frequency generation means driven with a driving frequency, wherein the driving frequency is supplied with electrical power by a control unit, wherein in particular the control unit is supplied with electrical power by a or the current conversion unit (C1 .. CN) of the power unit (Pl .. PN). Cooking device, in particular cooking hob, more in particu- lar induction cooking hob, with a circuit device (1) accord- ing to any of the preceding claims. |

CIRCUIT DEVICE FOR A COOKING DEVICE, IN PARTICULAR COOKING HOB, MORE IN PARTICULAR INDUCTION COOKING HOB AND COOKING DEVICE, IN PARTICULAR COOKING HOB, MORE IN PARTICULAR INDUCTION COOKING HOB

The present invention relates to a circuit device for a cooking device, in particular cooking hob, more in particular induction cooking hob and to a cooking device, in particular cooking hob, more in particular induction cooking hob.

Circuit devices for a cooking device, in particular cooking hob, more in particular induction cooking hob, for example induction boards, are supplied from mains current (or: AC grid voltage), by a single current/voltage phase or multiple current/voltage phases. From phase-neutral voltages, frequency converting means can derive sinusoidal currents for injecting in induction ele- ments, for example coils.

Furthermore, output direct currents, in particular low DC volt- ages, are generated for supplying electronics and for driving frequency converting means, in particular inverters.

Working with multiple current and/or voltage phases causes or can cause the presence of multiple voltage references in the de- vice that can lead to electrical problems, consequently func- tional electrical insulation must be present between loads, con- trol units or subsystems supplied by different phase voltages.

It is an object of the invention to provide an improved, and preferably cost effective, simpler and/or flexible, circuit de- vice, which in particular solves at least one or more of the following problems: - Many electrical components are used for current conversion units, for example AC/DC conversion units, in circuit de- vices for a cooking device, in particular when supplied by at least two mains current phases.

- The operation of these current conversion units increases or can increase stand-by power consumption.

- Complicated and/or complex EMI (electromagnetic interfer- ence) filters are used for each current phase.

- Operation with different mains current phases for small loads and control units prevents electrical insulation

- Complex drivers for frequency converting means, for example generator drivers, are used.

The object is solved in particular by the circuit device accord- ing to claim 1 and by a cooking device according to claim 15. Improvements are provided in the dependent claims.

The invention relates, in claim 1, to a circuit device for a cooking device, in particular cooking hob, more in particular induction cooking hob, the circuit device comprising

- at least two, in particular two or three or at least three power units, each power unit supplied with electrical power by a different mains current phase,

- wherein each power unit comprises frequency converting means, each for supplying at least one induction element with electrical power to generate heating power,

- wherein each power unit comprises at least one current con- version unit for converting an input direct current or an input alternating current into one, at least one, two or at least two output direct currents,

- wherein each power unit comprises at least one load or at least two loads, in particular one or more low-power loads and/or control units, supplied or to be supplied with elec- trical power by the output direct current, an output direct current or the output direct currents from the current con- version unit,

- wherein a first power unit comprises a first current conver- sion unit, in particular for converting an alternating cur- rent from a first mains current phase into one, at least one, two or at least two first output direct currents,

- wherein by the first output direct current or one of the first output direct currents of the first power unit, at least a second current conversion unit of a second power unit is supplied for converting the first output direct cur- rent into one, at least one, two or at least two second out- put direct currents.

By the invention, in particular, at least one or more of the following advantages can be obtained:

- Less electrical components can be used for current conver- sion units, for example DC/DC conversion units, in circuit devices for a cooking device, in particular when supplied by at least two mains current phases.

- The interruption of the operation of these current conver- sion units during inactivity decreases or can decrease stand-by power consumption.

- Simpler and/or less complex EMI filters are or can be used for at least some of the current phases.

- Operation with the same mains current phase for small loads and control units enables or can enable electrical insula- tion.

Less complex drivers for frequency converting means, for ex- ample generator drivers, are or can be used. Hence, in particular, the first output direct current or one of the first output direct currents of the first power unit is or can be the second input direct current of the second power unit. Preferably, by the invention, the first power unit can supply each other power unit with a direct current.

An input direct current can in particular be a DC input current. An input alternating current can in particular be an AC input current. An output direct current can in particular be a DC out- put current.

An alternating current can in particular be a current which is supplied by an alternating voltage or AC voltage, in particular between 100V and 250V or between 85V and 265V, with an input frequency, in particular between 45Hz and 130Hz, more in partic- ular of 50 Hz or 65Hz, as well as a current phase.

The current conversion unit can in particular be a DC/DC con- verter which converts a direct input voltage into one or more direct output voltages.

The current conversion unit can in particular be an AC/DC con- verter which converts an alternating input voltage into one or more direct output voltages.

A main current phase can in particular be an alternating current which is supplied with a predefined current phase. Such a cur- rent phase can be phase-shifted, for example by 120°, to differ- ent mains current phases. In particular, electrical power can be supplied by two or three different current phases which are phase shifted by 120° or 180°.

A mains current is in particular a current which is supplied by an external power net or supply net. A load can in particular be a control unit or a fan. A load can in particular be a low power unit which is preferably supplied with power by a supply voltage of 18V or less.

In particular embodiments, at least one or each power unit is a power board, in particular mounted as or on a printed circuit board.

A printed circuit board can allow a good isolation of the dif- ferent mains current phases. The usage of printed circuit boards can allow an efficient pre-mounting of the power units for the different mains current phases.

In particular embodiments, at least one or each of the current conversion units is an insulated current conversion unit, in particular an insulated AC/DC conversion unit and/or an insu- lated DC/DC conversion unit. This enables or can enable a good isolation of the different current phases.

In particular embodiments, the first current conversion unit is an AC/DC converter that outputs one, at least one, two or at least two direct voltages, in particular at least two different direct voltages, for example 5V and 18V, and/or currents from the first mains current phase, in particular from a single phase-neutral AC voltage or from a phase-phase AC voltage. This enables or can enable a direct power supply by the first mains current phase. A phase-phase AC voltage is or can be a typical mains voltage, for example in the United States of America.

In particular embodiments, the first current conversion unit, in particular by supplying at least a second current conversion unit and/or a third current conversion unit with electrical power, generates supply voltages for multiple loads, in particu- lar for multiple low power loads and/or control units, in par- ticular on at least a second power unit and/or a third power unit or each power unit and/or referred to different mains cur- rent phases and/or to different phase-neutral voltages and/or to different phase-phase AC voltages. This enables or can enable a power supply for the loads from the first power unit to at least one further power unit.

In particular embodiments, at least one of the current conver- sion units, in particular the or at least one current conversion unit of the second power unit and/or a third power unit, is or are DC/DC conversion units. This enables or can enable simpler and/or less complex current conversion units, as no AC/DC con- version is required in these current conversion units.

In particular embodiments, each power unit comprises at least one or only a single current conversion unit, in particular at least one or a single low power current conversion unit, for supplying currents and/or voltages to the loads, in particular the low power loads. This enables or can enable less current conversion units, as no further current conversion units are re- quired in these power units.

In particular embodiments, only the first current conversion unit is supplied by a mains current phase, and the second cur- rent conversion unit and/or third current conversion unit is/are only supplied by the first current conversion unit. This enables or can enable simpler and/or less complex current conversion units, as no AC/DC conversion is required in these current con- version units.

In particular embodiments, at least one or each current conver- sion unit outputs at least two output voltages, in particular two, at least two, three or at least three different output voltages, in particular for supplying different loads. This ena- bles or can enable the power supply of a larger variety of loads.

In particular embodiments, the first power unit is electrically connected with each of the other power units, in particular with the second power unit and/or third power unit, for supplying voltages for loads, in particular for low power loads and/or control units, in particular on each power unit and/or power units referred to different mains current phases and/or to dif- ferent phase-neutral voltages and/or to different phase-phase AC voltages. This enables or can enable simpler and/or less complex current conversion units, as no AC/DC conversion is required in these current conversion units.

In particular embodiments, the first current conversion unit of the first power unit is electrically connected with the current conversion units of each of the other power units for supplying voltages for all control units, in particular on each power unit and/or on power units referred to different mains current phases and/or to different phase-neutral voltages and/or to different phase-phase AC voltages.

In particular embodiments, a control unit is provided to turn-on or turn-off current conversion units, in particular insulated power supplies, of each power unit or of the second power unit and/or the third power unit.

In particular embodiments, the total power from the frequency converting means of each mains current phase is limited by a control unit to a predetermined maximum power, which in particu- lar limits the individual power of each frequency converting means to ensure that total power is below the or a rated power of each mains current phase. This enables or can enable the op- eration of, in particular a single, frequency converting means with a higher power.

In particular embodiments, the predetermined maximum power, which limits the power of the frequency converting means on each current phase such that that the total power, is below the or a maximum rated power of each current phase.

In particular embodiments, the cooking device comprises induc- tion elements, wherein each power unit supplies or is configured to supply at least one induction element, in particular induc- tion coil, with electrical power by a frequency converting means, preferably to generate heating energy for heating a cook- ing vessel disposed on the induction element or coil. This ena- bles or can enable to provide heating energy to the induction elements.

In particular embodiments, on each power unit, by a different current phase, one, at least one, two, at least two, three, at least three, four or at least four frequency converting means are supplied with electrical power.

In particular embodiments, each power unit comprises frequency converting means for supplying at least one induction element with electrical power from the mains current phase supplying the power unit with electrical power.

In particular embodiments, a frequency converting means is a means or inverter or generator for converting an input current with an input frequency, in particular between 45Hz and 130Hz, more in particular of 50Hz or 65Hz, into an output current with a high frequency, in particular with a frequency between 10kHz and 100kHz. This enables or can enable to provide heating energy to the induction elements.

In particular embodiments, a frequency converting means com- prises at least one, in particular common, rectifying means and/or, in particular in series, at least one frequency genera- tion means driven with a driving frequency, wherein the driving frequency is supplied with electrical power by a control unit, wherein in particular the control unit is supplied with electri- cal power by a or the current conversion unit of the power unit.

The invention relates to a cooking device, in particular cooking hob, more in particular induction cooking hob, with a circuit device according to the invention.

The present invention will be described in further detail with reference to the drawing, in which

FIG 1 shows a circuit device according to an embodiment of the present invention.

FIG. 1 shows a circuit device 1 according to an embodiment of the present invention.

The circuit device 1 is intended for a cooking device, in par- ticular cooking hob, more in particular induction cooking hob.

The circuit device 1 comprises at least two, in particular two, three or at least three power units Pl, P2, .. PN, each power unit supplied with electrical power by a different mains current phase L1, L2, .. LN. Each power unit P1, P2, .. PN comprises frequency converting means Gil .. GNM, each for supplying at least one induction ele- ment with electrical power to generate heating power.

Each power unit P1, P2, .. PM comprises at least one current conversion unit C1 .. CN for converting an input direct or al- ternating current into one, at least one, two or at least two output direct currents.

Each power unit P1, P2, .. PN comprises at least one load or at least two loads, in particular one or more low-power loads and/or control units, supplied or to be supplied with electrical power by the output direct current, an output direct current or the different output direct currents from the current conversion unit.

The first power unit P1 comprises a first current conversion unit C1, for converting an alternating current from a first mains current phase L1 into two first output direct currents Ill and I12.

By one of the first output direct currents I12 of the first power unit P1, a second current conversion unit C2 of a second power unit P2 is supplied for converting the first output direct current I12 into two output direct currents I21 and I22.

Hence, one of the first output direct currents is or can be the second input direct current. By the invention, the first power unit P1 can supply each other power unit with a direct current.

By one of the first output direct currents I12 of the first power unit P1, a third current conversion unit C3 of a third power unit P3 is supplied for converting the first output direct current I12 into two output direct currents I31 and I32. An input direct current is, for power units P2 and P3, a DC in- put current.

An input alternating current is, for power unit P1, an AC input current.

An output direct current is a DC output current.

An alternating current can be a current which is supplied by an alternating voltage or AC voltage, in particular between 100V and 250V or between 85V and 265V.

Each of the current conversion units C2, C3 .. CN is a DC/DC converter which converts a direct input voltage into two direct output voltages.

The current conversion unit C1 is an AC/DC converter which con- verts an alternating input voltage L1 into two direct output voltages.

A main current phase can in particular be an alternating current which is supplied with a predefined current phase. Such a cur- rent phase can be phase-shifted, for example by 120°, to differ- ent mains current phases. In particular, electrical power can be supplied by two or three different current phases which are phase shifted by 120° or 180°.

A mains current is a current which is supplied by an external power net or supply net.

A load can be a control unit or a fan. A load can in particular be a low power unit which is preferably supplied with power by a supply voltage of 18V or less. Each power unit P1, P2, .. PN is a power board, in particular mounted as or on a printed circuit board.

A printed circuit board can allow a good isolation of the dif- ferent mains current phases. The usage of printed circuit boards can allow an efficient pre-mounting of the power units for the different mains current phases.

Each of the current conversion units C1 .. CN is an insulated current conversion unit, in particular an insulated AC/DC con- version unit C1 and insulated DC/DC conversion units C2 .. CN.

This can enable a good electrical isolation of the different current phases.

The first current conversion unit C1 is an AC/DC converter that outputs two direct voltages, in particular two different direct voltages, for example 5V and 18V, and currents from the first mains current phase L1, in particular from a single phase-neu- tral AC voltage or from a phase-phase AC voltage.

The first current conversion unit C1, by supplying at least a second current conversion unit C2 and a third current conversion unit C3, generates supply voltages for multiple loads, in par- ticular multiple low power loads and/or control units, on at least a second power unit P2 and a third power unit P3 or each power unit P1 .. PN, referred to different mains current phases L1, L2, .. LN and to different phase-neutral voltages and/or to different phase-phase AC voltages.

At least one of the current conversion units C1 .. CN, in par- ticular the conversion units C2, C3 of the second power unit P2 and a third power unit P3, are DC/DC conversion units.

Each power unit P1 .. PN comprises at least one or only a single current conversion unit C1 .. CN, in particular at least one or a single low power current conversion unit, for supplying cur- rents and/or voltages to the loads, in particular the low power loads.

Only the first current conversion unit C1 is supplied by a mains current phase L1, and the second current conversion unit C2 and the third current conversion unit C3 are only supplied by the first current conversion unit C1.

Each current conversion unit C1 .. CN outputs at least two out- put voltages, in particular two different output voltages, in particular for supplying different loads.

The first power unit P1 is electrically connected with each of the other power units P2 .. PN, in particular with the second power unit P2 and third power unit P3, for supplying voltages for loads, in particular low power loads and/or control units, on each power unit P1 .. PN and power units referred to differ- ent mains current phases L1 .. LN and to different phase-neutral voltages and/or to different phase-phase AC voltages.

The first current conversion unit of the first power unit is electrically connected with the current conversion units of each of the other power units for supplying voltages for all control units, on each power unit and on power units referred to differ- ent mains current phases and to different phase-neutral voltages and/or to different phase-phase AC voltages.

The circuit device 1 comprises a control unit to turn-on or turn-off current conversion units, in particular insulated power supplies, of each power unit or of the second power unit and/or the third power unit.

The total power from the frequency converting means Gil .. GNM of each mains current phase L1 .. LN is limited by a control unit to a predetermined maximum power, which limits the individ- ual power of each frequency converting means G11 .. GNM to en- sure that total power is below the rated power of each mains current phase L1 .. LN.

The predetermined maximum power, which limits the power of the frequency converting means on each current phase such that the total power, is below the maximum rated power of each current phase.

The circuit device 1 comprises induction elements, wherein each power unit P1 .. PN supplies or is configured to supply at least one induction element with electrical power by a frequency con- verting means G1M .. GNM.

On each power unit P1 .. PN, by a different current phase L1 .. LN, one, at least one, two, at least two, three, at least three, four or at least four frequency converting means G1M .. GNM are supplied with electrical power.

Each power unit P1, P2, .. PM comprises frequency converting means G1M .. GNM for supplying at least one induction element with electrical power from the mains current phase L1, L2, .. LM supplying the power unit P1, P2, .. PM with electrical power.

A frequency converting means G1M .. GNM is a means or generator for converting an input current with an input frequency, in par- ticular between 45Hz and 130Hz, more in particular of 50Hz or of 65Hz, into an output current with a high frequency, in particu- lar with a frequency between 10kHz and 100kHz.

A frequency converting means G1M .. GNM comprises at least one, in particular common, rectifying means and/or, in particular in series, at least one frequency generation means driven with a driving frequency.

The driving frequency is supplied with electrical power by a control unit, wherein the control unit is supplied with electri- cal power by the current conversion unit C1 .. CN of the power unit P1 .. PN.

The circuit device 1 relates to and/or is part of and/or oper- ates a cooking device, in particular cooking hob, more in par- ticular induction cooking hob, with a circuit device 1.

List of reference numerals

1 Circuit device P1 . PN Power units L1 . LN Mains current phases

G11. GNM Frequency converting means C1 . CN Current conversion units

I11. IN2 First output direct currents

D11. DN2 Loads

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