System for reducing noise from a thermocouple in an induction heating system
AssigneeIllinois Tool Works Inc.
InventorPaul D. Verhagen
Life of this patent
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Abstract
A method and apparatus for reducing electrical noise in an electrical signal from a temperature feedback device to an induction heating system. The induction heating system has an electrical connector that is adapted to electrically couple a temperature feedback device to a system controller and to ground via a capacitor circuit. The capacitor circuit shunts electrical noise to ground but allows a temperature signal from the temperature feedback device to be received by the system controller. A shielded extension cable to electrically couple the temperature feedback device to an induction heating system may be used. The shielding of the extension cable is electrically coupled to ground.
Claims19
A controller for an induction heating system, comprising:
- a control circuit operable to control the application of power from a power source to an induction heating cable;
- and
- an interface circuit operable to electrically couple a plurality of conductors from a temperature feedback device to the control circuit, wherein the interface circuit also electrically couples each of the plurality of conductors to ground through a capacitor.
An extension cable for connecting a temperature feedback device to an induction heating system, comprising:
- a first electrical connector electrically coupleable to the temperature feedback device;
- a second electrical connector electrically coupleable to the induction heating system;
- a plurality of conductors electrically coupled to the first and second electrical connectors;
- and
- a shielding conductor surrounding the plurality of conductors.
An electronic system, comprising:
- an electronic circuit;
- a temperature feedback device having a plurality of conductors, wherein at least one of the temperature feedback device and the plurality of conductors is disposed within a magnetic field;
- and
- an interface operable to electrically couple the plurality of conductors to the first electronic circuit to transmit temperature data to the electronic circuit, wherein the interface electrically couples the plurality of conductors to ground through at least one capacitor to couple electrical noise from the magnetic field to ground.
An electrical system, comprising:
- a temperature feedback device operable to produce a signal representative of temperature;
- an extension cable comprising:
- a plurality of conductors electrically coupleable to the temperature feedback device;
- and
- a conductive shielding disposed around the plurality of conductors;
- and
- an interface operable to electrically couple the plurality of conductors to an electrical circuit and to electrically couple the conductive shielding to ground.
Dependencies are inferred from the claim text.