Analysis and implementation based on single-phase Boost AC/AC AC converter - News - Global IC Trade Starts Here 工业

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Abstract: This paper provides an in-depth analysis of the working principle and control strategy of a single-phase Boost AC/AC AC converter. By evaluating the polarity of the input voltage and integrating the error amplification signal of the output voltage with the triangular carrier, the operational states of each switch can be accurately determined. Simulations were conducted on the single-phase Boost AC/AC AC converter, and a prototype was successfully developed. Both the simulation and experimental results confirm the accuracy of the theoretical analysis and the practicality of the control strategy.

1 Introduction

AC/AC AC conversion refers to the process of converting one form of alternating current (AC) power into another form of AC [1-2]. Among these, power frequency transformers, AC-DC-AC converters, and electronic transformers that can be utilized for boost converters [3-4], high-frequency AC link AC/AC AC converters [5-6], non-isolated Boost-type, and Buck-Boost-type AC/AC AC converters [7-11] are the primary types.

Power frequency transformers have the drawbacks of being bulky and heavy, lacking voltage regulation capabilities. AC-DC-AC converters suffer from multiple conversion stages, low efficiency, and significant harmonic pollution to the power grid. They also require step-up transformers for boosting scenarios. Electronic transformers, while compact and lightweight, lack voltage regulation functions and necessitate a large number of switching devices. High-frequency AC link AC/AC AC converters, though capable of achieving electrical isolation, have complex topologies and control circuits, along with a high number of switching devices. Buck-Boost AC/AC AC converters can achieve both bucking and boosting functions but suffer from high voltage stresses on their switching tubes, lack a direct energy transfer path between input and output, resulting in lower conversion efficiency. Additionally, in cases where the input and output phases are opposite, they present challenges in boost operations without isolation. The Boost AC/AC AC converter, however, offers simplicity in structure and ease of control. This paper delves into the working principle and control strategy of a single-phase Boost AC/AC AC converter. Simulation studies were conducted, and a prototype was built. The simulation and test results align with the theoretical analysis.

2 Circuit Structure and Working Principle

Figure 1 illustrates the circuit structure of a single-phase Boost AC/AC AC converter [7], where S1 (S1a, S1b) and S2 (S2a, S2b) represent two pairs of AC switch tubes that operate in a high-frequency complementary manner. Their respective on-times are DTS and (1-D)TS, 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 DC converters. When the input voltage is positive, the forward Boost DC/DC DC converter comprises the inductor Lf, the switches S1a and S2a, and the capacitor Cf. Conversely, when the input voltage is negative, the reverse Boost DC/DC DC converter includes the inductor Lf, the switches S1b and S2b, and the capacitor Cf.

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