Liang Jia, Dong Wang, Jizhen Fu, Yanfei Liu, P. Sen
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引用次数: 8
摘要
近年来，为新型计算机中央处理器供电的Buck变换器的最优控制问题越来越受到人们的关注。本文提出了一种新的数字控制算法，在不依赖于输出电感、电容甚至ESR值等变换器设计参数的情况下，实现dc-dc降压变换器的时间最优响应。该算法基于抛物线曲线拟合分析，推导出阶跃负荷暂态下的算法公式。此外，该算法可以扩展到自适应电压定位(AVP)应用，只需对低ESR设计的Buck变换器进行简单修改。此外，由于其参数无关且无电流传感器的检测机制，它为AVP方案提供了一个实用且经济高效的接口。最后，给出了一个12 V-1.5 V Buck变换器样机的仿真和实验结果，验证了采用数字信号处理器(DSP)实现的方案。
A novel parameter-independent digital optimal control algorithm for DC-DC Buck converters based on parabolic curve fitting
Recently, optimal control on Buck converter for powering the latest computer central processor units (CPUs) has attracted more and more attention. In this paper, a novel digital control algorithm is presented to achieve the time-optimal response for dc-dc Buck converters without relying on any knowledge of converter design parameters such as output inductance, capacitance and even ESR value. This algorithm is based on the parabolic curve fitting analysis for deriving the algorithm formulas under the step load transients. Furthermore, this algorithm can be extended to adaptive voltage positioning (AVP) applications with simple modifications for a low ESR designed Buck converter. Also, it delivers a practical and cost-effective interface to AVP schemes due to the parameter-independent and current-sensorless detecting mechanism. Finally, simulations and experimental results of a 12 V-1.5 V Buck converter prototype are provided to validate the proposed schemes using digital signal processor (DSP) implementation.
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