Frequency converter and uninterruptible power source that employs the same

摘要

Invention Patent: B "FREQUENCY CONVERTER AND UNINTERRUPTED ENERGY SOURCE THAT EMPLOYS THE SAME" D. An uninterruptible power supply (UPS) includes a transformer; a low voltage converter (02); a rectifier and a high voltage inverter (01). The low voltage converter comprises a battery, a first switching device (Q3), a second switching device (Q4) and first driving circuits (41, 42). The high voltage inverter (01) includes first and second load terminals adapted to be coupled through a load in an emergency situation; an output capacitor (C); a third switching device (Q1) and a four switching device (Q2), and a second impeller circuit (43, 44) to drive the third and fourth switching devices, of the conductive and non-conductive states, and vice versa , in order to produce an almost sinusoidal output voltage waveform through load terminals.