Low Cost Microcontroller Based Implementation of Robust Voltage Based Capacitor Charge Balance Control Algorithm
Low Cost Microcontroller Based Implementation of Robust Voltage Based Capacitor Charge Balance Control Algorithm
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DOI：
10.1109/tii.2012.2219875
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发表时间：
2013-05
影响因子：
12.3
通讯作者：
Liang Jia;Yanfei Liu
中科院分区：
文献类型：
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作者：
Liang Jia;Yanfei Liu
本文提出了一种基于低成本微控制器的控制方法，利用电容电荷平衡的概念来实现Buck变换器的近最佳瞬态响应。首先，本文在简化微分方程的基础上，提出了实用电荷平衡方程的一种新的推导方法。最终的实现不需要复杂的计算和输出滤波器LC参数的准确知识。硬件实现只需要输出电压信息，与电压型控制器相比，不需要额外的传感电路。此外，该算法可以简单地扩展到自适应电压定位（AVP）应用中。其次，由于该算法的简单性，可以实现基于低成本微控制器（MCU）的控制器，从而缩短用户的开发周期。第三，与以前的工作不同，所提出的基于电压的CBC （V-CBC）控制器不需要精确的电流传感器或快速的模数转换器（ADC）。相反，为了检测电感电流等于新负载电流的临界时刻，引入了实用的极值电压检测器来捕获输出电压峰谷信息。建立了实验样机，验证了新方法的可行性和优越性。
In this paper, a low cost microcontroller based control method utilizing the concept of capacitor charge balance is presented to achieve a near-optimal transient response for Buck converters. First, this paper presents a new derivation of practical charge balance equations based on simplified differential equations. The final implementation does not require complex calculations and accurate knowledge of the output filter LC parameter. The hardware implementation only requires the output voltage information so that no extra sensing circuitry is needed compared with voltage mode controller. Also, this algorithm can be simply extended to adaptive voltage positioning (AVP) application. Second, due to the simplicity of this algorithm, a low cost microcontroller unit (MCU) based controller can be implemented to shorten the developing period for users. Thirdly, unlike previous work, the proposed voltage based CBC (V-CBC) controller does not require accurate current sensor or fast analog-to-digital converter (ADC). Instead, to detect the critical time instant when the inductor current equals the new load current, a practical extreme voltage detector is introduced to capture the output voltage peak/valley information. Experimental prototype is built to verify the feasibility and advantage of the new method.