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

功率转换器是移动终端中最重要的设备之一，耗能大。因此，实现小规模、高效率的功率变换是非常重要的。另一方面，由于芯片上的晶体管数量急剧增加，实现低电压/大电流输出的功率转换器也很重要。本研究的目的是为“片上功率转换器”的实现奠定基础。主要研究成果如下。1.提出并设计了一种低电压、大电流输出、高功率转换效率的功率转换器。该转换器由用于高频高效工作的电路设计技术(称为E类开关)和用于低电压/大电流输出的电路拓扑技术(称为交错)组成。2.将相控技术应用于文[1]中提出的变流器，并通过数值计算和实验验证了该变流器的重要特性。结果表明，在较宽的控制范围内均能保持较高的功率转换效率。3.将简单自适应控制的自适应滑模控制应用于BUCK变流器的数字控制应用中，由于E类开关的高频工作，使得该变流器的存储元件规模较小，为片上功率变流器的实现提供了可能。预计低电压/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。另外，本研究中数字控制的结果对数字功率变流器的改进有一定的影响。

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.