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首页> 外文期刊>Power Electronics, IEEE Transactions on >Hysteretic Mixed-Signal Controller for High-Frequency DC–DC Converters Operating at Constant Switching Frequency
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Hysteretic Mixed-Signal Controller for High-Frequency DC–DC Converters Operating at Constant Switching Frequency

机译：用于以恒定开关频率工作的高频DC-DC转换器的磁滞混合信号控制器

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摘要

A hysteretic mixed-signal controller for high-frequency switch-mode power supplies that achieves both very fast transient response and constant switching frequency under steady-state operation is presented. The mixed-signal controller combines three control loops: analog nonlinear current loop, digital linear voltage loop, and digital frequency loop. To eliminate the sampling delay associated with conventional digital controllers and improve the transient response performance, the fast nonlinear loop is built with a simple analog hardware. The nonlinear current loop is designed based on the hysteretic control of the output capacitor current. To guarantee the constant switching frequency, under different operating conditions, a digital frequency loop is proposed and implemented. The digital frequency loop eliminates undesirable switching frequency variation, associated with the conventional hysteretic controllers, by digitally adjusting the hysteretic bands around the output voltage reference. The controller operation is experimentally verified with a 5-MHz buck converter. Experimental results demonstrate fast transient response while the constant switching frequency is maintained under steady-state operation.
机译：提出了一种用于高频开关模式电源的磁滞混合信号控制器，该控制器在稳态操作下既可以实现非常快的瞬态响应，又可以实现恒定的开关频率。混合信号控制器结合了三个控制回路：模拟非线性电流回路，数字线性电压回路和数字频率回路。为了消除与常规数字控制器相关的采样延迟并改善瞬态响应性能，使用简单的模拟硬件构建了快速非线性环路。非线性电流环路是基于输出电容器电流的滞回控制而设计的。为了保证恒定的开关频率，提出并实现了一个数字频率环路。数字频率环路通过数字调整输出参考电压周围的磁滞带，消除了与常规磁滞控制器相关的不良开关频率变化。该控制器的操作已通过5MHz降压转换器进行了实验验证。实验结果表明，在稳态操作下保持恒定开关频率的同时，瞬态响应很快。

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