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Abstract: This paper provides an in-depth analysis of the working principles and control strategies of single-phase Boost AC/AC AC converters. By assessing the polarity of the input voltage and integrating the output voltage error amplification signal with the triangular carrier wave, the operational states of each switch can be accurately determined. The study also includes simulations and the development of a prototype. Both the simulation and experimental outcomes validated the accuracy of the theoretical analysis and the effectiveness of the control strategy.

1 Introduction:

AC/AC AC conversion refers to transforming one form of AC power into another. It primarily involves methods such as power frequency transformers, AC-DC-AC converters, electronic transformers that can act as boost converters, high-frequency AC link AC/AC converters, non-isolated Boost types, and Buck-Boost types of AC/AC converters. While power frequency transformers have significant size and weight issues and lack voltage regulation capabilities, AC-DC-AC converters suffer from multiple conversion stages, lower efficiency, and significant harmonic pollution. Electronic transformers, despite their compact design, lack voltage regulation functions and require numerous switching devices. High-frequency AC link converters, while capable of achieving electrical isolation, have complex topologies and control circuits along with a large number of switching devices. Buck-Boost AC/AC converters can perform both bucking and boosting but face high voltage stresses on their switching tubes, lack a direct energy transfer path between input and output, and thus exhibit low conversion efficiency. Furthermore, their input and output phases are often opposite. In scenarios requiring a boost without isolation, the Boost AC/AC converter stands out due to its simple structure and straightforward control mechanisms. This paper focuses on analyzing the working principles and control strategies of single-phase Boost AC/AC converters, conducting simulations, and building a prototype. The simulation and testing results align well with the theoretical analysis.

2 Circuit Structure and Working Principle:

Figure 1 illustrates the circuit structure of a single-phase Boost AC/AC converter [7]. Here, S1 (S1a, S1b) and S2 (S2a, S2b) represent two pairs of AC switch tubes that operate in high-frequency complementary mode. Their on-times are DTS and (1-D)TS, respectively, where D represents the duty cycle and TS is the switching period.

The converter can be viewed as a combination of two Boost DC/DC converters. When the input voltage is positive, the forward Boost DC/DC converter comprises the inductor Lf, switches S1a and S2a, and the capacitor Cf. Conversely, when the input voltage is negative, the reverse Boost DC/DC converter consists of the inductor Lf, switches S1b and S2b, and the capacitor Cf.

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