Electric heating – Microwave heating – Tunnel furnace
Patent
1974-09-18
1976-03-02
Shoop, William M.
Electric heating
Microwave heating
Tunnel furnace
219 1077, 321 45R, H02M 545
Patent
active
039420906
ABSTRACT:
An improved parallel-resonant circuit inverter of the type having a rectifier, a thyristor DC/AC converter connected thereto and operating at a controllable frequency, a parallel resonant circuit with an inductive load and a method of operation of such circuit whereby the converter voltage U is maintained at a constant operating value U.sub.B for a constant DC current I.sub.g = I.sub.go, in a first control range characterized by a low resonant-circuit damping, and control of the direct current I.sub.g for the purpose of maintaining the DC/AC voltage constant at its operating value U.sub.B, in the case of a constant thyristor extinction time t.sub.L = t.sub.LO, in a second control range characterized by a high damping, as well as by transition from the first to the second control range, if t.sub.L becomes equal to t.sub.LO in the case of increasing resonant-circuit damping, and transition from the second to the first control range, if I.sub.g become equal to I.sub.go in the case of decreasing damping.
REFERENCES:
patent: 3551632 (1970-12-01), Geisel
patent: 3725770 (1973-04-01), Bailey
patent: 3757197 (1973-09-01), Bailey
Matthes Hans
Mauler Erhard
AEG-Elotherm G.m.b.H.
Shoop William M.
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