The Study Of Digital Control Uninterrupted Power Supply

Uninterruptible power supplies(UPS) is a equipment, which can provide power for some equipments with backup energy. UPS mainly provide service for key facility of some consumers such as IDC, the liquidating department of bank, the life maintaining system in hospital, the tickets part of railway or airline company. It can provide high quality, steady, and pure sine wave voltage.A UPS has many power parts and controllers and is a very complicated system. Now most of UPS on market adopt analog control. Obviously, there exist lots of disadvantage. Analog control system need many unattached components. This will cost more and bring some potential failure. In past years, with the development of DSP the controller of UPS will turn to digital control.This paper has discussed the meaning of digital control of UPS. And compare the different control methods of inverter in UPS. Furthermore the more detail design approach is shown in paper. This paper also introduces a traditional 5kVA,digital control UPS based on DSP. In this paper ,the the ways of designing main power circuits,control systems and the disposal circuits are given.Use the powerful calculating ability and abundant peripheral equipments to control the inverter and whole logic operation of system. The detailed program flow is shown. And the charger with constant current and constant output voltage is designed.At last this paper gives the experiment results to validate the rationality and feasibility of this system design.