Cooking hob with several heating elements and at least one power electronics subassembly

• US 9,113,503 B2
• Filed: 12/09/2009
• Issued: 08/18/2015
• Est. Priority Date: 12/19/2008
• Status: Expired due to Fees

• Current Assignee: BSH Hausgeraete GmbH (Robert Bosch GmbH)
• Original Assignee: BSH Bosch und Siemens Hausgerã¤Te GmbH (Robert Bosch GmbH)
• Inventors: Arnal Valero, Adolfo, Garde Aranda, Ignacio, Llorente Gil, Sergio, Palacios Tomas, Daniel, Peinado Adiego, Ramon, Hernandez Blasco, Pablo Jesus, Santolaria Lorenzo, Jose Alfonso
• Primary Examiner(s): Hoang, Tu B
• Assistant Examiner(s): WARD, THOMAS JOHN
• Application Number:
  US13/131,912
• Publication Number:
  US 20110226756A1
• Time in Patent Office: 2,078 Days
• Field of Search: 219600-677
• US Class Current: 1/1
• CPC Class Codes: H05B 2213/03 Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
• CPC Class Codes: H05B 6/065 using coordinated control of multiple induction coils
• CPC Class Codes: H05B 6/1209 induction cooking plates or the like and devices to be used in combination with them
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A cooking hob, in particular an induction hob, includes several heating elements, at least one power electronics subassembly for generating a heating current for operating the heating elements, and a switching arrangement for making and breaking a connection between the power electronics assembly and the heating elements. The switching arrangement is constructed as an assembly that is separate from the power electronics assembly.

Claims

1. A cooking hob, comprising:

a plurality of heating elements including inductors;

at least one power electronics assembly for generating a heating current for operation of the heating elements, said power electronics assembly including at least one inverter for generating the heating current; and

a switching arrangement for making and breaking a connection between the power electronics assembly and the heating elements, said switching arrangement constructed as an assembly that is separate from the power electronics assembly,

wherein said switching arrangement comprises output interfaces, each of which is connected to one of the heating elements, switching elements, a pan detection circuit to detect a presence of an ovenware element and a degree of overlap between the ovenware element and a relevant inductor, a microcontroller to actuate the switching elements, and a readout circuit integrated to read out measured temperature values of the heating elements.

2. The cooking hob of claim 1, constructed in the form of an induction cooking hob.

3. The cooking hob of claim 2, wherein the power electronics assembly comprises at least two inverters.

4. The cooking hob of claim 1, wherein each said heating element comprises temperature sensors attached to the heating elements.

5. The cooking hob of claim 1, wherein the power electronics assembly and the switching arrangement each comprises a first plug connection for establishing a communication connection and a second plug connection for establishing a power supply connection between the power electronics assembly and the switching arrangement.

6. The cooking hob of claim 1, wherein the power electronics assembly comprises a rectifier, a filter circuit and an interface to a domestic electricity network.

7. A cooking hob, comprising:

a plurality of heating elements including inductors;

power electronics assemblies which operate the heating elements;

a switching arrangement assembly which is separate from the power electronics assemblies and which makes a conductive connection between the heating elements and the power electronics assembly in a first switch position, and interrupts the conductive connection in a second switch position, the switching arrangement assembly including a pan detection circuit to detect a presence of an ovenware element and a degree of overlap between the ovenware element and a relevant one of the inductors, a microcontroller to actuate the switching elements, a readout circuit integrated to read out measured temperature values of the heating elements, and output interfaces, each of which is connected to one of the heating elements; and

a control unit which controls the power electronics assemblies and actuates the switching arrangement so as to form a heating zone comprising selective heating elements to heat an ovenware element.

8. The cooking hob of claim 7, wherein each inductor is connected to one of the output interfaces, and the switching arrangement assembly comprises a relay for each inductor, and a multiplicity of capacitors assigned to the inductors in one-to-one correspondence, and which are each arranged between the relay and one of the output interfaces.

9. The cooking hob of claim 7, further comprising a first plug connection for establishing a communication connection, and a second plug connection for establishing a power supply connection, between the power electronics assembly and the switching arrangement assembly.

10. A cooking hob, comprising:

a plurality of heating elements;

power electronics assemblies which operate the heating elements;

a switching arrangement assembly operatively connected between the heating elements and the power electronics, which is separate from the power electronics assembly, and makes a conductive connection between the heating elements and the power electronics assembly in a first switch position, and interrupts the conductive connection in a second switch position, wherein the switching arrangement assembly includes a relay for each heating element, output interfaces, each of which is connected to one of the heating elements, and a multiplicity of capacitors assigned to the heating elements in one-to-one correspondence and which are each arranged between the relay and one of the output interfaces;

a control unit which controls the power electronics assemblies and the switching arrangement assembly so as to form a heating zone comprising selective heating elements to heat an ovenware element; and

a first plug connection for establishing a communication connection and a second plug connection for establishing a power supply connection between the power electronics assemblies and the switching arrangement assembly.

11. The cooking hob of claim 10, wherein the heating elements comprise inductors.

12. The cooking hob of claim 11, wherein the switching arrangement assembly comprises:

a pan detection circuit to detects a presence of an ovenware element and a degree of overlap between the ovenware element and a relevant inductor;

a microcontroller to actuate the switching elements; and

a readout circuit integrated to read out measured temperature values of the heating elements.

13. The cooking hob of claim 11, wherein the inductors of a heating zone are operated at the same heating frequency.