Three phase alternating input current conversion system for electric power equipment, has circuits comprising respective components, where one of components of circuits are controlled when voltages of phase of input current is negative

摘要

The system (10) has boost type converter circuits (30, 32, 34) provided with controllable electronic switching components i.e. transistors, (T1-T3) and other controllable electronic switching components i.e. transistors (T4-T6), respectively. One of the components of the circuits are controlled, when voltages (V-ac1, V-ac2, V-ac3) of phase of input current is positive, and other of the components of the circuits are controlled, when the voltages of the phase of input current is negative.