Study on paralleled dc-dc converters with self-organizing function

并联DC-DC变流器不仅是下一代微处理器中低压大电流的重要系统，而且是一个具有丰富有趣现象的非线性动态系统。本文基于赢家通吃原理，采用新颖的开关规则对这类系统进行了研究。主要结果如下：1)为了分析系统动力学，用恒压源代替输出负载，并引入了一个简单的模型。该模型适用于系统时间常数大于时钟周期的情况。该模型具有分段恒定(PWC)矢量场和分段线性轨迹。2)在单个DC-DC转换器的PWC模型中，明确了稳定周期运行的参数条件、混沌产生的参数条件以及分叉现象的结构。在并联DC-DC变流器的PWC模型中，阐明了多相稳定运行所需的参数条件，即均流低纹波。分析了从同步现象到超混沌的分叉现象。3)为了灵活操作系统，我们引入了依赖于时间和状态变量的多种切换策略。适当地应用开关规则，几乎在所有参数范围内都可以实现稳定的多相同步。我们设计了模拟-数字-混合电路来实现开关规则。制作了简单的测试电路，对典型的系统工作进行了实验验证。

Paralleled dc-dc converters are important systems not only for lower-voltage higher-current capability in next generation micro-processors but also as nonlinear dynamical systems having rich interesting phenomena.We have studied such systems with original switching rules based on Winner-Take-All principle.The major results are as the following.1) In order to analyze the system dynamics, the output load is replaced with a constant voltage source and a simple model is introduced. The model is available in the case where the system time constant is sufficiently larger than the clock period. The model has piecewise constant(PWC) vector field and piecewise linear trajectory. The PWC model is well suited for precise analysis.2) In the PWC model of single dc-dc converter, we have clarified parameters condition for stable periodic operation, parameters condition for chaos generation and structure of bifurcation phenomena. In the PWC model of paralleled dc-dc converters, we have clarified parameters condition for stable multiphase operation that is desired for current sharing with low ripple. Bifurcation from the synchronous phenomena to hyperchaos is also analyzed.3) For flexible system operation, we have introduced plural switching strategies depending on both time and state variable. Applying the switching rules appropriately, stable multi-phase synchronization is possible for almost all parameter range. We have designed analog-digital-hybrid circuit to realize the switching rules. Fabricating simple test circuits, typical system operation is confirmed experimentally.