Abstract
The single‐phase rectifier‐inverter is the main circuit of the single‐phase UPS. Traditionally, the half‐bridge with split capacitor topology and the three‐arm topology are employed for pursuing low cost and high efficiency. This paper presents a three‐arm topology replacing one transistor‐arm with one diode‐arm to further reduce the cost as compared to three‐arm topology. The diode‐arm is placed on the rectifier side and the PFC function is achieved through the rectifier arm (REC‐arm) which provides the common path for the rectifier and inverter. To control the inverter voltage with only the inverter arm (INV‐arm), the feedforward control method is adopted for the INV‐arm to reduce the interaction with the rectifier through the REC‐arm. Modeling of the proposed rectifier‐inverter with the diode‐arm and controller design of the rectifier and inverter portions are provided in this paper. A 500VA UPS is built. The effectiveness of the proposed method is confirmed with some experimental results.
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