High-Efficiency Single-Phase Matrix Converter With Diverse Symmetric Bipolar Buck and Boost Operations

Abstract

Single-phase matrix converters (MCs) are undergoing rapid developments due to their bipolar voltage gain (as required in dynamic voltage restorers) and step-changed frequency operation (used in high step-up ac-dc rectifiers, and to provide medium frequency isolation in traction and wind turbine converters, etc.). However, existing buck-boost MCs require high-voltage/current rating devices, and suffer from large component voltage/current stresses and ripples, significantly degrading their efficiency. This article proposes a highly efficient single-phase buck-boost MC; consisting of eight IGBTs (implemented using two full-bridge IGBT modules), second-order input and output filters, and a small value film capacitor. Efficient discrete inverting and noninverting buck and boost operations are proposed (same as that of sixteen-switch cascaded buck-boost MC) with significantly lower component voltage/current stresses and ripples. In addition, flexible inverting and noninverting buck-boost operations are proposed with independent control of buck and boost duty ratios. All of the proposed operations are free of commutation issues, compatible with reactive loads, and provide smooth input and output currents. Furthermore, all the switches have same voltage stresses, and all four switches in a full-bridge module experience the same current stresses. A comprehensive description of circuit operation is presented based on a number of proposed switch modulation strategies with a nonunity power factor load, followed by design guidelines, and comparative evaluations with existing topologies. Finally, experimental verification results are presented, using a 400-VA laboratory prototype converter.

A single‐phase q‐source AC‐AC converter with continuous input current, safe commutation feature, and reduced bidirectional switch counts

“…In Table 1, the parameter γ Γ is considered equal n for the converter in Banaei et al 29 and Mousavi et al 30 According to relation (14), the proposed converter efficiency versus the duty cycle has been illustrated in Figure 8A for various the coupled inductor winding coefficient. Also, the voltage stresses on power switches of the q-source converter and competitors are compared in Figure 8B.…”

“…Single-Phase Matrix Converters (SPMCs) are another group of AC-AC power converters that can simultaneously regulate the amplitude and frequency. [13][14][15][16] Lots of required components and the complexity of the control system are the main disadvantages of SPMCs. Direct AC-AC converters are the most common converters with single-stage power conversion and simple switching methods used for single-phase AC-AC applications.…”

“…AC‐DC‐AC converters are generally utilized for regulating the output frequency. Single‐Phase Matrix Converters (SPMCs) are another group of AC‐AC power converters that can simultaneously regulate the amplitude and frequency 13–16 . Lots of required components and the complexity of the control system are the main disadvantages of SPMCs.…”

A highly efficient isolated single‐phase variable frequency AC–AC converter with flexible buck‐boost factor, inherent safe commutation, and continuous current

“…Smaller size and lower cost due to fewer active and passive components are the main advantages of direct ac-ac converters compared to indirect ac-dc-ac [13][14][15][16][17][18][19][20]. In the third method, single-phase matrix converters (SPMCs) are utilized [21][22][23][24][25][26][27]. The SPMC is a single-phase ac-ac converter without bulky capacitors and inductors in its structure.…”

A Simple Two-Stage AC-AC Circuit Topology Employed as High-Frequency Controller for Domestic Induction Heating System

“…In [9], an interface is developed between the three-phase system and single-phase distributed generator. The matrix converters for domestic level applications are single-phase to single-phase, as reported in [11][12][13][14][15][16]. In these single-phase matrix converters, the output voltage regulation is ensured through PWM control of high frequency-controlled devices.…”