The Performance of a Single-Phase Current-Fed Inverter with Counter EMF - Inductive Load

Current-fed inverters that have series diodes to trap the charge on a commutating capacitor can supply ac loads of any power factor. A single-phase circuit with counter emf-inductance load, such as a motor, has been analyzed by digital computer simulation, valid for all modes of operation. The magnitude and phase of the ac load current are graphically related to the direct current and thyristor firing angle with respect to the counter emf. The ratio of the operating frequency to the natural ringing frequency of the commutating capacitance and the load inductance is a parameter of the circuit that significantly affects its behavior. Problems associated with high-frequency operation in a drive system are discussed.