Induction heating system and method of output power control

• US 7,696,458 B2
• Filed: 06/03/2005
• Issued: 04/13/2010
• Est. Priority Date: 06/03/2005
• Status: Active Grant

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Veik, Brian J., Thomas, Jeffrey R., Baxter, Randall G., Verhagen, Paul D., Beistle, Edward G.
• Primary Examiner(s): Robinson; Daniel
• Application Number:
  US11/144,897
• Publication Number:
  US 20060289492A1
• Time in Patent Office: 1,775 Days
• Field of Search: 219/660, 219/661, 219/662, 219/663, 219/664, 219/665, 219/666, 219/667, 219/668, 219/669, 219/670, 219/671
• US Class Current: 219/660
• 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

Abstract

A system and method for inductively heating a work piece. The induction heating system is coupleable to at least one temperature feedback device. The temperature feedback device is disposed within the induction heating system to provide a signal representative of the temperature of an induction heating system component. The induction heating system is operable to control the output of the induction heating system based on the temperature of the induction heating system component to protect the component from heat damage.

Claims

1. An induction heating power source, comprising:

a power source controller operable to direct the induction heating power source to produce a desired output to heat a work piece to a desired temperature, wherein the power source controller is operable to receive a signal representative of an operational parameter of the induction heating power source and is operable to limit the output of the induction heating power source to a level below the desired output to heat the work piece to the desired temperature when the signal representative of an operational parameter of the induction heating power source achieves a first threshold value; and

wherein the induction heating power source comprises a temperature controller operable to provide a signal to direct the power source to produce the desired output to heat the work piece to the desired temperature, wherein the power source controller controls the output of the power source based on the signal from the temperature controller and the signal representative of an operational parameter of the power source.

2. The induction heating power source as recited in claim 1, wherein the power source controller is operable to deactivate the induction heating power source when the signal representative of an operational parameter of the induction heating power source achieves a second threshold value, the second threshold value being greater in value than the first threshold value.

3. The induction heating power source as recited in claim 1, wherein the signal representative of an operational parameter comprises a signal representative of temperature of a power source component.

4. The induction heating power source as recited in claim 1, wherein the signal representative of an operational parameter comprises a signal representative of a current flowing through the induction heating power source.

5. The induction heating power source as recited in claim 1, wherein the signal representative of an operational parameter data comprises a signal representative of output voltage of the induction heating power source.

6. The induction heating power source as recited in claim 1, wherein the signal representative of an operational parameter comprises a signal representative of output power of the induction heating power source.

7. The induction heating power source as recited in claim 1, comprising:

a power source component;

a temperature feedback device configured to generate a signal representative of temperature of the power source component; and

wherein the power source controller is communicatively coupled to the temperature feedback device and the power source component, and the power source controller is configured to establish a desired output of the power source component based on the signal representative of temperature.

8. The induction heating power source as recited in claim 7, wherein the power source controller is configured to limit the desired output of the power source component to a defined output when the temperature rises to a defined temperature.

9. The induction heating power source as recited in claim 7, wherein the power source controller is configured to establish the desired output of the power source component based on another signal representative of temperature of a stationary work piece and a desired temperature of the stationary work piece.

10. The induction heating power source as recited in claim 7, wherein the power source component comprises a plurality of power source components, and each power source component has a temperature feedback device configured to transmit a signal representative of temperature of the respective power source component to the power source controller, and wherein the power source controller is configured to establish the desired output of each power source component based on the plurality of signals representative of temperature.

11. The induction heating power source as recited in claim 7, wherein the power source component comprises an inverter, or a rectifier, or an IGBT, or a solid state component, or a combination thereof.

12. The induction heating power source as recited in claim 7, wherein the power source controller is configured to control the induction heating power source based on a signal representative of an operational parameter of a liquid coolant.

13. The induction heating power source as recited in claim 12, wherein the power source controller is configured to at least limit output power of the induction heating power source if the signal representative of the operational parameter of the liquid coolant at least reaches a threshold.

14. The induction heating power source as recited in claim 13, wherein the signal representative of the operational parameter of the liquid coolant comprises a coolant temperature, and the threshold comprises a threshold coolant temperature.

15. The induction heating power source as recited in claim 13, wherein the signal representative of the operational parameter of the liquid coolant comprises a coolant flow rate, and the threshold comprises a threshold coolant flow rate.

16. The induction heating power source as recited in claim 1, wherein the power source controller is configured to control the induction heating power source to produce a desired output to heat a stationary work piece to a target temperature, wherein the power source controller is configured to at least limit output of the induction heating power source to a level below the desired output if a power source component at least reaches or exceeds a first threshold operational value.

17. The induction heating power source as recited in claim 16, wherein the power source controller is configured to at least limit output of the induction heating power source to a suitable level below the desired output if a component of a system powered by the induction heating power source at least approaches or achieves a second threshold operational value.

18. The induction heating power source as recited in claim 17, wherein the second threshold operational value comprises a threshold coolant flow rate, or a threshold coolant temperature, or a combination thereof.

19. The induction heating power source as recited in claim 16, wherein the power source component comprises an inverter, or a rectifier, or an IGBT, or a solid state component, or a combination thereof.

20. The induction heating power source as recited in claim 19, wherein the first threshold operational value comprises a threshold temperature, or a threshold current, or a combination thereof.

21. The induction heating power source as recited in claim 1, comprising an air-cooled induction heating cable coupled to the induction heating power source.

22. The induction heating power source as recited in claim 1, comprising an induction heating cable coupled to the induction heating power source.

23. The induction heating power source as recited in claim 22, wherein the induction heating cable comprises a fluid-cooled induction heating cable.

24. The induction heating power source as recited in claim 1, comprising a control panel coupled to the power source controller, wherein the control panel comprises a display configured to indicate the operational parameter.

25. The induction heating power source as recited in claim 24, wherein the display is configured to indicate when the first threshold value has been reached.

26. A method of operating an induction heating device, comprising:

controlling an induction heating power source to produce a desired output to heat a work piece to a desired temperature, comprising;

receiving a first signal representative of an operational parameter of the induction heating power source; and

providing a second signal to direct the induction heating power source to produce the desired output to heat the work piece to the desired temperature, comprising limiting output of the induction heating power source to a level below the desired output to heat the work piece to the desired temperature when the first signal achieves a first threshold value.

27. A method of manufacturing an induction heating device, comprising:

providing a power source controller operable to direct an induction heating power source to produce a desired output to heat a work piece to a desired temperature, wherein the power source controller is operable to receive a signal representative of an operational parameter of the induction heating power source and is operable to limit the output of the induction heating power source to a level below the desired output to heat the work piece to the desired temperature when the signal representative of an operational parameter of the induction heating power source achieves a first threshold value; and

wherein the induction heating power source comprises a temperature controller operable to provide a signal to direct the induction heating power source to produce the desired output to heat the work piece to the desired temperature, wherein the power source controller controls the output of the induction heating power source based on the signal from the temperature controller and the signal representative of an operational parameter of the induction heating power source.