A Bipolar High-Voltage Multiplier Using Switched-Capacitor AC-AC Converters

Kei EGUCHI, Kanji ABE, Ichirou OOTA


To provide nutritious and fresh processed foods at low cost, an underwater shockwave has been utilized for non-thermal food processing in recent years. In this paper, we propose an efficient high voltage multiplier in order to generate the underwater shockwave. Unlike conventional Cockcroft-Walton voltage multipliers (CWVMs), the proposed multiplier amplifies the input voltage twice by combining a switched-capacitor (SC) ac-ac converter and a bipolar CWVM in series. The proposed multiplier can achieve smaller size than existing multipliers, because the proposed multiplier requires no full-bridge circuits. Furthermore, owing to the series-connected bipolar topology using an SC ac-ac converter, high step-up gain can be realized with a small number of stages. The operation principle and characteristic evaluation are described concerning the proposed multiplier. Simulation program with integrated circuit emphasis (SPICE) simulations demonstrate the feasibility and effectiveness of the proposed multiplier.


Bipolar topology, Cockcroft-Walton multipliers, Non-thermal food processing, Switched-capacitor circuits.


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