Electric heating – Metal heating – Of cylinders
Patent
1975-06-04
1977-03-22
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1077, 321 18, 336181, H05B 504
Patent
active
040138593
ABSTRACT:
An induction heating unit is provided having an essentially zero stand-by power requirement and comprised by a high power solid-state inverter for supplying relatively high frequency excitation currents to an induction heating coil, and including inhibit, delay, and starting and stopping gating circuits to control the operation of the high frequency power inverter. An induction heating load sensing device senses the presence of a load such as a pan or other metal base cookware located in induction heating relationship with respect to the induction heating coil. The pan presence sensing device comprises a very low power oscillator coupled to a load sensing coil for exciting the load sensing coil with high frequency oscillatory signals which preferably are in the range of two to three times the frequency at which the power inverter operates. The load sensing coil is physically positioned adjacent the induction heating coil in a location to provide inductive coupling of the high frequency sensing signal to a pan load suitably supported near the induction heating coil. The pan load sensing coil is designed to minimize the effect of inductive coupling to the induction heating coil, and for this purpose is provided with a multiple loop figure-eight or cloverleaf shape so designed and positioned that currents induced in the loops of the sensing coil by the magnetic field of the induction heating coil null one another at the terminals of the sensing coil. A load sensing detector responds to the magnitude of the high frequency voltage across the pan load sensing coil and controls the operation of the gating circuits of the power inverter in a load-selective manner to cause turn-on of the power inverter only in the presence of a proper pan load.
REFERENCES:
patent: 3770928 (1973-11-01), Kornrumpf et al.
patent: 3796850 (1974-03-01), Moreland et al.
patent: 3806688 (1974-04-01), MacKenzie et al.
patent: 3973105 (1976-08-01), Tsumori
Environment One Corporation
Helzer Charles W.
Reynolds Bruce A.
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