Abstract:
This paper proposes a new class of single-stage high-frequency ac-link power converters that can step up/down voltage across a wide frequency and voltage range. The bidirectional power flow family can interface various single/multi-port dc and/or single/multi-phase ac systems to provide dc-dc, dc-ac, ac-dc, or ac-ac power conversion. A small inductor that forms the link exchanges power between the source and load in this modular converter family. The proposed family can operate in buck, boost, buck-boost, or a combination of these modes. The proposed family has fewer power switches, link peak current, and switch ratings than parallel inductive four-quadrant link converters. These features boost system efficiency, power density, and cost. To achieve soft-switching operation for the proposed configurations, a small capacitor is placed in parallel with the link inductor to reduce EMI, current/voltage stress on all semiconductor devices, and system efficiency. For electrical isolation, the converters could use a lightweight single-phase high-frequency transformer. Power switches with external fast recovery diodes prevent reverse recovery and body diode losses in the proposed circuit topologies. The proposed family’s immunity from short circuit of input and output terminals and open circuit of the link inductor, which may occur in other power converters due to commutation problems caused by a short deadtime or overlap time between switches, unwanted control command, delay in electronic circuits, or EMI noise misgating on or off, and the power circuit’s lack of electrolytic capacitors, makes it very reliable. One-stage power conversion input and output currents are regulated by a control method. This paper describes the theoretical analysis, operation, design methodology, and control strategy of the proposed converter family, and simulation and experimental results verify its effectiveness and performance.
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