Patent ID: 6121592
Filing Date: 2000-09-19
Classification: H05B

Abstract:
An induction heating device for producing a controlled temperature distribution in a non-electrically conductive material, the device comprising:a power source;a multi-section induction coil comprising a plurality of coil sections disposed around the length of an electrically conductive material, each coil section having first and second terminations, at least one pair of adjacent coil sections overlapping each other along longitudinal segments of the electrically conductive material the non-electrically conductive material placed within the electrically conductive material to heat the non-electrically conductive material;at least first and second switching circuits for switching power from the power source between the coil sections, each coil section being powered individually from the power source; anda control circuit for controlling the switching circuits to vary the power supplied from the power source to each of the coil sections in a preselected manner to obtain a controlled temperature distribution along the length of the electrically conductive material.