Load transient and dynamic voltage scaling (DVS) are commonly seen in the operation of the system processor. These two functions usually encounter large output voltage transient, which is hard to be quickly settled. Charge balance control is one of the prior choices that enables the converter to operate at its optimal charge/discharge slew rate so as to achieve fast transient response. The effectiveness of the optimal performance generally requires precise knowledge of the circuit parameters for charge balance computation. However, parameter drifting due to the manufacturing process may affect the performance, which is hard to implement a power integrated circuit (IC) for wide range applications. Different from the original approaches, this paper proposes an auto‐tuning charge balance control (AT‐CBC) to optimize load transient response and DVS of the buck converter. The auto‐tuning mechanism can save the preknowledge of the output filter and avoid complex calculation in digital control. The function of AT‐CBC is validated by a field‐programmable gate array (FPGA) controlled buck converter. Experimental result shows that the output voltage can be settled within 3 μs for the 750‐mA load step transient. For the 0.3‐V DVS transient, the output voltage can be settled within 4 μs.

中文翻译：

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自动调整电荷平衡控制以改善降压转换器的瞬态响应

负载瞬态和动态电压缩放（DVS）通常在系统处理器的操作中看到。这两个功能通常会遇到较大的输出电压瞬变，很难快速稳定下来。电荷平衡控制是使转换器能够以最佳充电/放电转换速率工作以实现快速瞬态响应的优先选择之一。最佳性能的有效性通常需要精确了解电路参数以进行电荷平衡计算。但是，由于制造过程而导致的参数漂移可能会影响性能，因此很难为大范围应用实现功率集成电路（IC）。与原始方法不同，本文提出了一种自动调谐电荷平衡控制（AT-CBC），以优化负载瞬态响应和降压转换器的DVS。自整定机制可以节省输出滤波器的知识，并避免数字控制中的复杂计算。AT-CBC的功能已通过现场可编程门阵列（FPGA）控制的降压转换器进行了验证。实验结果表明，对于750mA负载阶跃瞬变，输出电压可以稳定在3 µs之内。对于0.3V DVS瞬态，输出电压可在4 µs内稳定下来。实验结果表明，对于750mA负载阶跃瞬变，输出电压可以稳定在3 µs之内。对于0.3V DVS瞬态，输出电压可在4 µs内稳定下来。实验结果表明，对于750mA负载阶跃瞬变，输出电压可以稳定在3 µs之内。对于0.3V DVS瞬态，输出电压可在4 µs内稳定下来。