Development of Power Converter for On-chip ImpIementation and Its Digital Control with Multiple Input Multiple Output

电源转换器是移动终端中最重要的设备之一，其能耗巨大。因此，实现小尺寸、高效率的功率变换器是十分重要的。另一方面，由于一个芯片上晶体管的数量急剧增加，实现低电压/大电流输出的功率转换器也很重要。本研究的目的是建立实现“片上功率转换器”的基本技术。重要的结果描述如下。1. 提出并设计了一种具有低电压大电流输出和高功率转换效率的功率变换器。该变换器由用于高频高效工作的电路设计技术（称为E类开关）和用于低压大电流输出的电路拓扑技术（称为交错）组成。2. 将相位控制技术应用于1中提出的变换器。数值和实验结果阐明了其重要特性。结果表明，在较宽的控制范围内，可以保持较高的功率转换效率。3. 采用简单的自适应控制将自适应滑模控制作为数字控制应用之一应用于降压变换器。E类开关的高频工作意味着变换器的存储元件规模小，这扩大了片上功率变换器实现的可能性。期望低电压/大电流输出和高功率转换效率适用于各种规格的功率转换器的设计。此外，本研究的数字控制结果对改进数字电源变换器具有重要意义。

Power converter is one of the most important devices in mobile terminal since it wastes much energy. Therefore, the achievement of the power converter with small scale and high efficiency is quite important. On the other hand, it is also important to achieve the power converter with a low voltage/high current output since the number of the transistors on one chip increases steeply. It is the purpose of this research to establish the fundamental techniques toward the realization of "on-chip power converter" . Important results are described as follows. 1. The power converter with a low voltage/high current output and high power conversion efficiency is proposed and designed. This converter consists of the circuit design technique for the high frequency and high efficiency operation, called as class E switching, and the circuit topology technique for the low voltage/high current output, called as interleaving. 2. The phase-control technique is applied to the converter that is proposed in 1. The important characteristics are clarified by numerical and experimental results. The results show that high power conversion efficiency can be kept under the wide control range. 3. The adaptive sliding mode control using simple adaptive control is applied to buck converter as one of the digital control application.The high frequency operation due to the class E switching means the small scale of memory elements of the converter, which extends the possibility of the implementation of the on-chip power converter. It is expected that the low voltage/high current output and high power conversion efficiency are applicable to the design of the power converter with various specifications. Additionally, the results of a digital control in this research have impact to improve digital power converters.