A method for the operation of a parallel resonant circuit converter and for operation with this method a suitable parallel resonant circuit converter

摘要

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 UB for a constant DC current Ig = Igo, in a first control range characterized by a low resonant-circuit damping, and control of the direct current Ig for the purpose of maintaining the DC/AC voltage constant at its operating value UB, in the case of a constant thyristor extinction time tL = tLO, in a second control range characterized by a high damping, as well as by transition from the first to the second control range, if tL becomes equal to tLO in the case of increasing resonant-circuit damping, and transition from the second to the first control range, if Ig become equal to Igo in the case of decreasing damping.