Digital current‐limited sliding‐mode control for synchronous buck converter with curved switching surface,International Journal of Circuit Theory and Applications

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Digital current‐limited sliding‐mode control for synchronous buck converter with curved switching surface
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-09-13 , DOI: 10.1002/cta.2875
Jinghao Li ₁ , Aiguo Wu ₁

Affiliation

In this paper, a digital current‐limited sliding‐mode control (DCLSMC) for synchronous buck converter with curved switching surface is proposed. First, by discretizing the derivatives of a hybrid switching surface (SS) (consisting of second‐order and first‐order SS) and utilizing the reaching law method, a discrete‐time sliding‐mode control (SMC) is derived. Then, this SMC is integrated with a current‐limited control to construct the DCLSMC. Simulation results show that it can provide a current‐limited near‐time‐optimal dynamic response. The proposed SMC is implemented by pulse‐width modulation (PWM) technique, so it can provide a fixed switching frequency and has a low sampling requirement. The reachability of the SS for the proposed SMC and the stability of the quasi‐sliding mode motion is proven. Moreover, an additional PI control is introduced to eliminate the steady‐state error, and some implementation issues are discussed. Experimental results are given to verify the high dynamic performance and practical value of the proposed method.

中文翻译：

具有弧形开关表面的同步降压转换器的数字限流滑模控制

本文提出了一种具有弧形开关表面的同步降压转换器的数字限流滑模控制（DCLSMC）。首先，通过离散化混合开关表面（SS）的导数（由二阶和一阶SS组成）并利用到达定律方法，得出离散时间滑模控制（SMC）。然后，此SMC与限流控件集成在一起以构建DCLSMC。仿真结果表明，它可以提供限流的近时最优动态响应。所提出的SMC是通过脉宽调制（PWM）技术实现的，因此它可以提供固定的开关频率，并且对采样的要求较低。拟议的SMC具有SS的可达性和准滑模运动的稳定性。而且，引入了附加的PI控制以消除稳态误差，并讨论了一些实现问题。实验结果证明了该方法的高动态性能和实用价值。

更新日期：2020-09-13

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