A high voltage multiplier is proposed for non-thermal food processing systems utilizing an underwater shockwave. Unlike conventional Cockcroft-Walton Voltage Multiplier (CWVM) providing a DC output from an AC input, the proposed multiplier consists of two switched-capacitor-based DC-DC converters with different polarities. Owing to the symmetrical bipolar structure without magnetic component, the proposed multiplier can achieve faster response speed and lower voltage drop than the conventional CWVM. The theoretical analysis and simulation program with integrated circuit emphasis (SPICE) simulations show the effectiveness of the proposed voltage multiplier.

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Abstract:In signal processing circuits of a RDIF tag, the relaxation of restriction concerning operating voltage range enables us to develop various applications. In order to provide higher voltage to the signal processing circuit, two types of step-up AC-DC converters for RFID tags are proposed in this paper: the ¿¢ step-up converter and the ¢ step-up converter. To reduce ripple noise of output voltage, the proposed converters consist of 2 charge-pump type AC-DC converters with opposite polarities. Unlike conventional converters, the proposed converters can offer higher output voltages by realizing ¿¢/ ¢ step-up conversion. Furthermore, as for the ¿¢ step-up converter, the circuit size of the proposed converter is almost the same as that of the Cockcroft-Walton type AC-DC converter. The properties of the proposed converters are clarified by theoretical analyses. The theoretical formulas can derive the equivalent circuits, output voltages, and power efficiency. Furthermore, SPICE simulations and the experiments showed the validity of theoretical formulas and circuit design.

In this paper, switched-capacitor (SC) AC-DC / AC-AC converter with arbitrary output voltages using same circuit configuration is proposed. This converter can reduce voltage drop even if load currents are large, and can choice DC output or AC output by changing signal patterns of switches in the same AC input. The validity of the proposed converter is confirmed by SPICE simulations. The SPICE simulations showed that the output voltage and the output frequency can be determined arbitrarily.I.

A switched-capacitor (SC) converter is in the VI Vfis a desired Discharge (blankarea) spotlight as a coilless converter that consists of the capacitors outputvoltage.a and switches. However, it was difficult to output the largeNVrf Crge (lhached area) current because the timing which can charge capacitors is short at an AC input.In this paper, we propose a separate type SC converter with an AC input. "Separate type" means an electric separation of