Charge-transfer type floating switches and their application

开关电容（sc）技术通过高速变换电容电路来完成能量转换或信号处理功能，提供了电路集成必不可少的无线圈和无变压器电路结构。在本研究中，我们研究了浮动开关，以实现在直流或交流线路上的高速大功率开关。它们最终能够在集成电路中制造。首先，利用SC技术研究了不依赖于地电平并向mosfet栅极驱动器供电的浮动电源。开发了用于直流线路（总是正电平）和商用交流线路的浮动开关。实现了它们在直流和交流线路上的应用。荧光灯电子镇流器作为一种直流浮动开关应用，实现了不使用线圈和变压器，且工作正常。此外，这些直流浮动开关应用于DC-DC变换器和AC-DC变换器。从理论和实验两方面证明了这种新型环形变换器具有高效率和低噪声的特点。在常规交流电源线上运行的交流浮动开关，是为实现宝贵的电力控制而研制的。该开关经证实可在高达数百千赫的高速时钟上运行。这提供了双向电流控制和一个简单的配置。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.