Protective circuit for a series tuned-(resonant-)circuit invertor having saturable inductors

摘要

In the case of a conventional invertor which consists of two thyristors (T1, T2) connected in series, each having antiparallel diodes (DD1, DD2) and supplied from a power source (E) via saturable inductors (L1, L2), a voltage peak produced by the inductors (L1, L2) when the current passes through zero is reduced by a protective circuit. In this case, the protective circuit consists of the series circuit of a diode (D1), of a resistor (R1), of a capacitor (C2) and of another diode (D2), a series circuit comprising a capacitor (C1) and resistor (R2) being connected in parallel to the resistor (R1) and the capacitor (C2). In this case, the capacitors (C1, C2) take up the voltage peaks produced by the inductors (L1, L2) and dissipate them via the resistors (R1, R2), the diode (DD1 or DD2) and the thyristor (T2 or T1). <IMAGE>