期刊
出版社
IEEE
DOI: 10.1109/CSPA55076.2022.9781916
关键词
voltage regulator; phase margin; noninvasive; machine learning; ESR
资金
- Ministry of Higher Education malaysia [FRGS/1/2019/TK04/UKM/03/1]
Linear voltage regulator instability due to load current change can be compensated by connecting an output capacitor with specific equivalent series resistance. Precise stability condition can be obtained by measuring the phase margin based on frequency response. Machine learning methods were proposed to estimate the phase margin, with Gaussian process regression producing the best results.
Linear voltage regulator (LVR) instability due to sudden load current change can be compensated by connecting an output capacitor with specific equivalent series resistance (ESR) at its output terminal. In manufacturing, the optimum ESR range is characterized by the load transient tests for a range of load current and ESR values. Currently, the stability condition is determined by observing the output voltage oscillation counts. However, this process is less accurate and time-consuming. A more precise stability condition can be obtained by measuring the phase margin based on the frequency response. Yet, it needs to be conducted in an open-loop condition, which is difficult for the LVR integrated circuit. Therefore, an approach is developed to noninvasively measure the phase margin in closed-loop conditions based on the LVR frequency response. Furthermore, five machine learning (ML) methods were proposed to solve the regression problem to estimate the phase margin for any operating points. Those ML methods are support vector machine, decision-tree, ensemble method, neural network, and Gaussian process regression. The inputs are load current and ESR, while the phase margin acts as the targets in the ML training. In addition, hyperparameters in each ML method are also optimized. Results showed that Gaussian process regression produces validation RMSE, MSE, MAE, and R-2 of 0.1736, 0.0301, 0.0612, and 1.0000, respectively. The trained ML methods were then used to estimate the phase margin. To conclude, the phase margin in the LVR circuit can be effectively estimated without breaking the internal control loop.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据