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2019•IEEJ Transactions on Industry ApplicationsOpen access

Development of Converter Cooperative Control for Buck-Boost Mode Multi-Level AC/DC Converter

Hajime Toyoda, Ryota Kondo, Takaaki Takahara, Hiroyasu Iwabuki

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Abstract

A new control method for multi-level PFC converters is proposed in this paper. Multi-level AC/DC comprises a PFC reactor, sub converter, and main converter. With cooperative control, the sub converter and the main converter switch each other, and they cooperate to control input current and output voltage. The proposed control can reduce the capacity of the sub converter capacitor to 1/200 of the conventional control. As a result, high power factor and constant voltage controls in the buck-boost modes are verified experimentally with a 3-kW prototype using film capacitors. Moreover, the same efficiency as that of a conventional one is achieved.

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What this paper is about

A new control method for multi-level PFC converters is proposed in this paper. Multi-level AC/DC comprises a PFC reactor, sub converter, and main converter. With cooperative control, the sub converter and the main converter switch each other, and they cooperate to control input current and output voltage. The proposed control can reduce the capacity of the sub converter capacitor to 1/200 of the conventional control. As a result, high power factor and constant voltage controls in the buck-boost modes are verified experimentally with a 3-kW prototype using film capacitors. Moreover, the same efficiency as that of a conventional one is achieved.

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Available abstract

A new control method for multi-level PFC converters is proposed in this paper. Multi-level AC/DC comprises a PFC reactor, sub converter, and main converter. With cooperative control, the sub converter and the main converter switch each other, and they cooperate to control input current and output voltage. The proposed control can reduce the capacity of the sub converter capacitor to 1/200 of the conventional control. As a result, high power factor and constant voltage controls in the buck-boost modes are verified experimentally with a 3-kW prototype using film capacitors. Moreover, the same efficiency as that of a conventional one is achieved.

Key concepts: Ćuk converter, Buck converter, Buck–boost converter, Boost converter, Forward converter, Flyback converter, Capacitor, Converters

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