Electricity, human have not lived without it, since it was discovered! Can you imaged the whole world get black, then being what? But in our daily life, power-down it's avoidance, so UPS occurs. Form the 1960s to now, although it's just a few years, but development is so quickly, market has many kinds of UPS.
This architect designing a kind of UPS,which is on-line: When the 220V electric voltage is in good order, it gives electricity to the load and refresh to the storage battery; when the 220V electric voltage blockouts,I2V of storage battery DC into 220V AC. ICL8038 DC input voltage into sine wave, and then put Rectifier precision sine wave into buns, After SG3524 SPWM wave generated, IR2110 driver circuit through the final SPWM pulse transformers are used to wave generated by the filter for AC. Experiment results indicate that system output waveform and running performance are much better, and design requirements are satisfied. It is suit for the family user to use.