数字控制降压变换器的ESR零估计与自动补偿

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition Pub Date : 2009-07-21 DOI:10.1109/APEC.2009.4802663

Zhenyu Zhao, S. M. Ahsanuzzaman, A. Prodic

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引用次数: 10

摘要

介绍了buck变换器传递函数中电容等效串联电阻(ESR)引入的零的估计和补偿方法。该方法非常适合于数字控制器的实际实现。通过在线测量输出电压纹波和功率级角频率来估计ESR零点。相应地，对PID补偿器的系数进行了更新，以避免潜在的稳定性问题。给出了辨识和补偿器设计的理论依据。该方法在12v ~ 1.5 v、500 kHz、10W降压变换器样机上进行了实验验证。

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ESR Zero Estimation and Auto-compensation in Digitally Controlled Buck Converters

A method for estimating and compensating the zero introduced by the capacitor equivalent series resistance (ESR) in the buck converter transfer function is introduced. The method is well-suited for practical implementation with digital controllers. The ESR zero is estimated by online measurement of the output voltage ripple and the power stage corner frequency. Accordingly, the coefficients of the PID compensator are updated to avoid potential stability problems. Theoretical basis of the identification and the compensator design are presented. The method is experimentally verified on a 12V-to-1.5V, 500 kHz, 10W buck converter prototype.

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2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition

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