Switched capacitor-based high voltage multiplier with 220v@50hz input for generating underwater shockwaves

Abstract

Non-thermal food processing using underwater shockwaves is a cost-effective technology for preserving food items with minimal impacts on their nutritious property. In order to generate underwater shockwaves, a high voltage multiplier is the major element for system hardware implementation. To support the 220V and 50Hz AC input for generating 3.7kV DC output, this paper presents the high voltage multiplier based on switched capacitor technique. The proposed circuit consists of three main components, which are AC-DC rectifier, level shift driver, and parallel-connected voltage multiplier circuit. The theoretical relationship analysis utilizing a 4-terminal equivalent circuit is described for investigation of not only the output voltage but also the energy loss due to internal resistance and the power efficiency of the proposed high voltage multiplier. In addition, the operations of the proposed circuit are also simulated by using PSPICE program to confirm its workability.