Temperature-protected inductor-based cooking heater
AssigneeC E P E M
InventorJean-Yves Gaspard
Life of this patent
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Abstract
An induction cooking heater includes at least one inductor, a high-frequency current generator and a magnetic circuit located beneath the inductor. The reluctance of the magnetic circuit is calibrated so that the magnetic circuit gets saturated from a predetermined temperature lower than the maximum permissible temperature for the inductor. A plate made of non-magnetic, electrically conductive material located beneath the magnetic circuit, gives rise to an increase in current in the inductor when the magnetic circuit starts getting saturated. The generator is then controlled by a regulator for limiting the value of the current in the inductor to deliver lower power to the inductor.
Claims15
An induction cooking heater of the type comprising at least one inductor, a generator delivering a high-frequency current to supply the inductor and a magnetic circuit located beneath the inductor, wherein the magnetic circuit has a reluctance calibrated so that it gets saturated from a predetermined temperature lower than the maximum permissible temperature for the inductor, and wherein it further comprises:
- means giving rise to an increase in the drawing of current in the inductor beyond a boundary value as soon as the magnetic circuit gets saturated;
- regulation means detecting the increase in the drawing of current in the inductor beyond the boundary value and then limiting the power delivered to the inductor.
Dependencies are inferred from the claim text.