Ring type Switched-Capacitor DC-AC Converter

开关电容器（switched-capacitor，简称sac）的低功耗要求，使得开关电容器的设计成为一个新的课题。SC）电源，使用多个MOSFET开关的电路交换性能，建议采用n沟道MOSFET和高栅极驱动电压。这第二个要求是自举电源中的一个深层次问题，因为自举电路的最后一级除了采用附加的自举电路之外不能利用任何超过电源的电压。为此，提出了一种电路结构简单的自举电路。此外，该电路还采用了省电模式，为栅极驱动器提供了足够的电源电压。因此，使用所提出的栅极驱动器的DC-DC转换器在3.8V的电源电压下给出了92%的高转换效率。所提出的驱动电路示出，以使最好地利用环型SC电源。附加电路仅由多个开关和一个电容构成，节能模式能有效降低功耗。这使得所有时钟（驱动信号）根据待机信号有效而无效，因此所有开关断开，并且输入/输出端子与电源和负载分离。这些实验结果和模拟结果在国际会议（ITC-CSCC 2002，The 2002 International Technical Conference on Circuits/Systems，Computers and Communications）上给出。）的要求很高。对于这种用途，非常小的SC电源是在芯片上实验生产的。裸芯片电源的尺寸为6.8mm平方× 3 mm厚，内置4个外部自举电容。目前，由于通道结构的制造方法限制了输出功率，但低噪声和极小尺寸的电源提供了一个光明的前景。

The requirement of the low power dissipation of switched-capacitor (abbr. SC) power supplies, which use many MOSFET switches for the performance of the circuit exchange, is recommended to adopt n-channel MOSFETs and a high gate-driving voltage. This second requirement is a deep problem in boot-up power supplies, because the last stage of boot-up circuits can not utilize any excess voltage than the power source except adopting an additional boot-up circuit. For this purpose, a novel boot-up circuit of simple circuit configuration is proposed. Furthermore, a power saving mode is adopted for this purpose.The proposed circuit provides sufficient power voltage to gate drivers. Therefore the DC-DC converter using the proposed gate driver gives a high conversion efficiency of 92% under the power source voltage of 3.8V. The proposed driving circuit is shown to make the best use of a ring-type SC power supply. The additional circuit is constructed only by several switches and one capacitor.The power-saving mode can reduce the power consumption effectively. This performs to make all clocks (driving signals) inactive according to the standby signal active, therefore the all switches turn off and the input/output terminals are separate from the power source and the load. These experimental results and simulation results are presented at the international conference (ITC-CSCC 2002, The 2002 International Technical Conference on Circuits/Systems, Computers and Communications).For backlighting of mobile equipment displays such as PHS, electroluminescent (abbr. EL) is extensively requested. For this usage, very small SC power supplies are experimentally produced on a chip. A size of the bare-chip power supplies is 6.8mm square×3mm thickness within 4 external boot-up capacitors. The output power is limited at the present time by the manufacturing method of the channel structure, but the low noise and extremely small size power supplies gave a bright vista.