Charge-transfer type floating switches and their application

开关电容(SC)技术通过高速改变电容电路来实现能量转换或信号处理功能，并提供对电路集成至关重要的无线圈和无变压器的电路结构。他们最终有能力在集成电路中制造产品。首先，利用SC技术研究了独立于地面并向开关器件(MOSFET)的栅极驱动器提供电能的浮动电源。开发了直流线路(始终为正电平)和商用交流线路的浮动开关。作为一种直流浮动开关应用，实现了一种不使用线圈和变压器的荧光灯电子镇流器，并确认其工作正常。此外，这些DC浮动开关还应用于DC-DC转换器和AC-DC转换器。从理论和实验两个方面证明了这些新型的环型变流器具有高效率和低噪声的特性。传统交流电力线上的交流浮动开关就是为了实现宝贵的功率控制而开发的。该开关被证实可以工作在高达数百kHz的高速时钟上。这提供了双向电流控制和简单的配置。电压和电流限制仅取决于MOSFET额定值。

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.