Method for transmitting data, induction heating device, inductively heatable cooking vessel and system

Patent metadata

Field	Value
Publication number	US-9603201-B2
Application number	US-201213712554-A
Country	US
Kind code	B2
Filing date	Dec 12, 2012
Priority date	Dec 16, 2011
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The disclosure herein provides for transmitting data from an induction heating device to a receiver of an inductively heatable cooking vessel. The induction heating device may include a resonant circuit with an induction heating coil and a converter that may generate a control voltage (UA) from an AC mains voltage (UN) with a control frequency. The resonant circuit may be applied with a control voltage in order to generate an alternating magnetic field for heating the cooking vessel. The data to be transmitted to the receiver may be encoded using the the control frequency.

First claim

The invention claimed is:

1. A method for transmitting data from an induction heating device to a receiver of an inductively heatable cooking vessel, the method comprising:
utilizing a converter of the induction heating device to generate, from an AC mains voltage, a control voltage having a control frequency, the control frequency comprising a frequency shift keyed amplitude modulated signal;
applying the control voltage having the control frequency to a resonant circuit of the induction heating device;
in response to applying the control voltage to the resonant circuit, generating an alternating magnetic field for heating the inductively heatable cooking vessel;
changing the control frequency of the control voltage in a range of 0.1% to 5% with respect to a base frequency to generate at least two discrete control frequencies for encoding data to be transmitted via the control voltage having the at least two discrete control frequencies to a receiver of the inductively heatable cooking vessel; and
transmitting the encoded data via the at least two discrete control frequencies of the control voltage to the receiver of the inductively heatable cooking vessel.

2. The method of claim 1 , wherein the base frequency comprises a range of 20 kHz to 50 kHz.

3. The method of claim 1 , wherein changing the control frequency is effected in a time period around the zero-crossing of the AC mains voltage,
wherein the time period is defined by an absolute value of the AC mains voltage being lower than 25 V during said time period.

4. The method of claim 1 , wherein transmitting the data comprises transmitting the data in binary code, wherein a digital Zero is assigned to a first control frequency of the at least two discrete control frequencies, and a digital One is assigned to a second control frequency of the at least two discrete control frequencies.

5. The method of claim 1 , further comprising receiving response data from the receiver.

6. An induction heating device, comprising:
a resonant circuit comprising an induction heating coil; and
a converter comprising a control unit and configured
to generate, from an AC mains voltage, a control voltage having a control frequency, the control frequency comprising a frequency shift keyed amplitude modulated signal,
to apply the control voltage having the control frequency to the resonant circuit such that an alternating magnetic field is generated for heating a cooking vessel, and
to change the control frequency of the control voltage in a range of 0.1% to 5% with respect to a base frequency to generate at least two discrete control frequencies for encoding data to be transmitted via the control voltage having the at least two discrete control frequencies to a receiver of an inductively heatable cooking vessel.

7. The induction heating device of claim 6 , wherein the base frequency comprises a range of 20 kHz to 50 kHz.

8. The induction heating device of claim 6 , wherein changing the control frequency is effected in a time period around the zero-crossing of the AC mains voltage,
wherein the time period is defined by an absolute value of the AC mains voltage being lower than 25 V during said time period.

9. The induction heating device of claim 6 , wherein the control unit is further configured to transmit the data to a receiver of an inductively heatable cooking vessel in binary code, wherein a digital Zero is assigned to a first control frequency of the at least two discrete control frequencies, and a digital One is assigned to a second control frequency of the at least two discrete control frequencies.

10. An induction heating system, comprising:
an induction heating device comprising
a resonant circuit comprising an induction heating coil, and
a converter comprising a control unit and configured
to generate, from an AC mains voltage, a control voltage having a control frequency, the control frequency comprising a frequency shift keyed amplitude modulated signal,
to apply the control voltage having the control frequency to the resonant circuit such that an alternating magnetic field is generated for heating an inductively heatable cooking vessel, and
to change the control frequency of the control voltage in a range of 0.1% to 5% with respect to a base frequency to generate at least two discrete control frequencies for encoding data to be transmitted via the control voltage having the at least two discrete control frequencies to a receiver of the inductively heatable cooking vessel; and

the inductively heatable cooking vessel comprising a receiver configured to receive the encoded data via the at least two discrete control frequencies of the control voltage from the induction heating device and decode the encoded data by analysis of the at least two discrete control frequencies.

11. The induction heating system of claim 10 , wherein the inductively heatable cooking vessel further comprises a sensor for detecting a parameter which is specific to the inductively heatable cooking vessel.

12. The induction heating system of claim 10 , wherein the base frequency comprises a range of 20 kHz to 50 kHz.

13. The induction heating system of claim 10 , wherein changing the control frequency is effected in a time period around the zero-crossing of the AC mains voltage,
wherein the time period is defined by an absolute value of the AC mains voltage being lower than 25 V during said time period.

14. The induction heating system of claim 10 , wherein transmitting the data comprises transmitting the data in binary code, wherein a digital Zero is assigned to a first control frequency of the at least two discrete control frequencies, and a digital One is assigned to a second control frequency of the at least two discrete control frequencies.

15. The induction heating system of claim 10 , wherein the induction heating device is configured to receive response data from the receiver.

Assignees

• Ego Elektro Geraetebau Gmbh

Inventors

• Bogel Jorg
• Eberle Michael

Classifications

• H05B6/06 Primary

  Control, e.g. of temperature, of power · CPC title

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B2213/06

  Cook-top or cookware capable of communicating with each other · CPC title