Dependence of Current Inverter Critical Frequencies on its Load Parameters

The paper presents the results of the study of the scheme of autonomous current inverter with cut-off diodes (ACI with CD) when working on an active-inductive load in terms of identifying its properties, energy characteristics and comparing the scheme with the traditional parallel current inverter with capacitive switching without additional gates. In this paper the results of critical frequency dependence on discharge circuit parameters including active-inductive load, intermediate transformer and commutating capacitor on the example of single-phase circuit (ACI with CD) are presented. It is found that the main factors that determine the critical frequency are: the value of switching capacitance, type and size of the load, load power factor. It is shown that with decrease of commutating capacitance value and load power factor (with active-inductive load) critical frequency has increasing character. Analytical expressions for currents and voltages of ACI with CD, which fully reflect electromagnetic processes occurring in the circuit, are presented.