Abstract Herein disclosed is an inverter device for use in an induction heating equipment in which an oscillating current having a suitable frequency is fed to an induction heating coil which is placed in proximity to a material to be heated, whereby eddy current and hysteresis loses are invited in the material to be heated so that heat is generated in the material. The inverter device features provision of noise preventive means, adapted to dampen out the high-frequency field built up by the component elements of the inverter circuit, leak current preventing means adapted to prevent leakage of current from the material to be heated to ground, and a variable inductor arrangement adapted to vary the apparent inductance of the induction heating coil. A typical application of the inverter device is an induction heating cooking equipment.
An induction heating equipment having a fullwave rectifier providing a power source, through two bus lines, for a chopper type inverter unit, said unit including an induction heating coil and a filter inductor serially connected in one of said bus lines, and an insulating plate disposed upon said induction heating coil for supporting materials to be heated by this coil, said insulating plate carrying on its upper surface, where said material to be heated in placed, an electrically conductive film strip having a width of up to 5mm and being grounded at one end thereof for discharging capacitively developed charges on said material, said film strip occupying only a limited space on said plate to allow magnetic fluxes from said induction heating coil to cause a sufficient amount of eddy current in said material.
Claim 2
Dependent Claim
134 words
An induction heating equipment having a fullwave rectifier providing a power source, through two bus lines, for a chopper type inverter unit, said unit including an induction heating coil and a filter inductor serially connected in one of said bus lines, and an insulating plate disposed upon said induction heating coil for supporting materials to be heated by this coil, said insulating plate carrying on its upper surface, where said material to be heated in placed, an electrically conductive film strip having a width of up to 5mm and being grounded at one end thereof for discharging capacitively developed charges on said material, said film strip occupying only a limited space on said plate to allow magnetic fluxes from said induction heating coil to cause a sufficient amount of eddy current in said material.
Claim 3
Dependent Claim
30 words
An induction heating equipment as defined in claim 1, wherein said film strip is formed of a substance selected from the group consisting of copper, nickel, carbon and tin oxide.