A new UPS topology employing a PFC boost rectifier cascadedhigh-frequency tri-port converter
Jia-You Lee; Yu-Ming Chang; Fang-Yu Liu
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 4, Aug 1999 Page(s):803 - 813
Digital Object Identifier 10.1109/41.778246
Summary:A new uninterruptible power supply (UPS) topology using the
high-frequency tri-port UPS technique is proposed which presents the
advantages of no-break power, low cost, input unity power factor, high
power density, and high power conversion efficiency. Through the
proposed circuit configuration, charging concept, and control strategy,
the battery management is easily obtained by controlling the output
voltage of the power-factor-correction (PFC) converter, which results in
no additional power device being required for charging. The implementing
circuit of the charging method is submitted to perform the two-stage
charging, constant current charging, and constant voltage charging. The
proposed technologies can be applied to the switching power supply with
built-in UPS function featuring a low-cost solution for computer
equipment, Finally, an experimental AC online UPS is built to verify the
proposed concept, analysis, and control strategy
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