Induction heating system having multiple temperature input control

• US 7,786,415 B2
• Filed: 06/03/2005
• Issued: 08/31/2010
• Est. Priority Date: 06/03/2005
• Status: Active Grant

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Beistle, Edward G., Thomas, Jeffrey R., Baxter, Randall G., Verhagen, Paul D.
• Primary Examiner(s): Van; Quang T
• Application Number:
  US11/145,285
• Publication Number:
  US 20060289495A1
• Time in Patent Office: 1,915 Days
• Field of Search: 219/667, 219/627, 219661-663, 219/677, 219/494, 219/510, 266/87, 266/129, 568/72
• US Class Current: 219/677
• CPC Class Codes: H05B 6/06 Control, e.g. of temperature, of power
• CPC Class Codes: H05B 6/101 for local heating of metal pieces
• CPC Class Codes: H05B 6/40 Establishing desired heat distribution, e.g. to heat particular parts of workpieces

Abstract

A system and method for inductively heating a work piece. The induction heating system is coupleable to a plurality of temperature feedback devices operable to provide a signal representative of work piece temperature. The induction heating system is operable to control the output of the induction heating system based on the plurality of signals representative of work piece temperature received from the plurality of temperature feedback devices.

Claims

1. An induction heating system, comprising:

An induction heating power source;

a controller configured to control output of the induction heating power source based on a plurality of signals representative of work piece temperatures at a generally common time of induction heating at a portion of a work piece, wherein the controller is operable to select an outlier signal from the plurality of signals representative of work piece temperatures to control the output of the induction heating power source based on a programmed control scheme, wherein

the controller comprises a processor operable to receive programming instructions and the plurality of signals representative of work piece temperature from each of a respective one of a plurality of temperature feedback devices, wherein the processor is configured to select one of the plurality of temperature feedback devices to control the induction heating power source based on the signal from the selected temperature feedback device and the programming instructions; and

an interface adapted to enable the plurality of temperature feedback devices to be communicatively coupled to the processor, wherein the interface comprises a plurality of analog-to-digital converters configured to convert each of the signals representative of work piece temperatures to a digital signal representative of work piece temperature.

2. An induction heating system, comprising:

An induction heating power source;

a controller configured to control output of the induction heating power source based on a plurality of signals representative of work piece temperatures at a generally common time of induction heating at a portion of a work piece, wherein the controller is operable to select an outlier signal from the plurality of signals representative of work piece temperatures to control the output of the induction heating power source based on a programmed control scheme, wherein

the controller comprises a processor operable to receive programming instructions and the plurality of signals representative of work piece temperature from each of a respective one of a plurality of temperature feedback devices, wherein the processor is configured to select one of the plurality of temperature feedback devices to control the induction heating power source based on the signal from the selected temperature feedback device and the programming instructions; and

a selector operable to sequentially couple each of the digital signals representative of work piece temperatures to the processor.

3. An induction heating system, comprising:

An induction heating power source;

a controller configured to control output of the induction heating power source based on a plurality of signals representative of work piece temperatures at a generally common time of induction heating at a portion of a work piece, wherein the controller is operable to select an outlier signal from the plurality of signals representative of work piece temperatures to control the output of the induction heating power source based on a programmed control scheme, wherein

the controller comprises a processor operable to receive programming instructions and the plurality of signals representative of work piece temperature from each of a respective one of a plurality of temperature feedback devices, wherein the processor is configured to select one of the plurality of temperature feedback devices to control the induction heating power source based on the signal from the selected temperature feedback device and the programming instructions; and

a controller is operable to direct the induction heating power source to heat the portion of the work piece at a desired temperature for a desired period of time, and the processor is pre-programmed to measure the desired period of time from when all of the work piece temperatures are within a pre-designated range.