Charge-transfer type floating switches and their application

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Switched-capacitor (abbr.SC) technique performs energy transform or signal processing function by changing capacitors circuit in high speed and provides with coilless and transformerless circuit configurations which is essential to circuit integration.In this study, floating switches are investigated for the purpose of high speed and high power switching operating on DC lines or AC lines by using SC technique. They are ultimately capable to fablicate in an integrated circuit. To begin with, floating power sources which is independent from the ground level and feed electric power to the gate driver of switching devices (MOSFETs) are investigated by using SC technique. Floating switches for DC line(always positive level) and for commercial AC line are developed. Their application for DC and AC lines are realized.As a DC floating switch application, an electronic balast for fluorescent lamps is realized by no used of coils and transformers, and confirmed to operate normally. Furthermore, these DC floating switches are applied to a DC-DC converter and an AC-DC converter. These novel converters charactered as a ring type are shown to have high efficiency and low noise characteristics from the theoretical and experimental aspects.The AC floating switch operating on conventional AC power line is developed for the purpose of precious power control. This switch is confirmed to operate on high speed clock up to several hundreds kHz. This provides bidirectional current control and a simple configuration. The voltage and current limits are depend only on the MOSFET ratings.