Electric heating – Metal heating – Of cylinders
Patent
1982-02-12
1984-01-31
Envall, Jr., Roy N.
Electric heating
Metal heating
Of cylinders
219 1049R, 363 96, 363135, 307252M, 307252T, 323289, H05B 606, H05B 612
Patent
active
044292058
ABSTRACT:
An induction heating apparatus which includes an induction coil with an associated load and a resonant inverter circuit coupled to a DC power supply for energizing the heating coil. The inverter circuit includes a gate controlled thyristor which is cyclically gated to produce a conductive first period followed by an nonconductive second period in order to energize the heating coil. A diode of opposite polarity to the gate controlled thyristor is coupled in parallel therewith and has an impedance connected in series. The voltage across this series impedance is coupled to the gate of the gate controlled thyristor. The inverter circuit additionally includes an improper load check circuit for disabling the gating of the thyristor in the event of an improper load coupled to the heating coil, and a gate triggered timing generator for adjusting the timing of production of thyristor gate pulses to maintain substantially constant power to proper heating coil loads.
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Envall Jr. Roy N.
Leung Philip H.
Roper Corporation
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