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Stability and Sensitivity Analysis of Uniformly Sampled DC-DC Converter With Circuit Parasitics

机译:具有电路寄生效应的均匀采样DC-DC转换器的稳定性和灵敏度分析

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摘要

In this paper the stability and sensitivity function of three basic dc-dc converter with the consideration of circuit parasitics has been analyzed for analog and digital controller implementation. The steady state and small-signal analysis has been used to derive the mathematical expressions for uniformly sampled voltage-mode controlled converters. The effect of digital controller using the ratio of sampling to carrier frequency has been analyzed. The sampling frequency limits the voltage gain in the stepped manner and also affects the stability of the digitally controlled converter. The sensitivity function has been defined for voltage gain with respect to various system parameters. The maximum affected regions on duty ratio scale with corresponding parasitic variable have been discussed. The detailed stability analysis has been carried out for digitally implemented three basic dc-dc converters, i.e., buck, boost, and buck-boost circuits. The analytical results are verified with the simulations performed in PSCAD/EMTDC. An FPGA controller is considered as digital controller for the dc-dc converter and verification of the results through experiment.
机译:在本文中,针对模拟和数字控制器的实现,分析了考虑电路寄生因素的三个基本DC-DC转换器的稳定性和灵敏度函数。稳态和小信号分析已用于推导统一采样的电压模式控制转换器的数学表达式。分析了使用采样率与载波频率之比的数字控制器的效果。采样频率以步进方式限制电压增益,并且还影响数控转换器的稳定性。已针对各种系统参数针对电压增益定义了灵敏度函数。讨论了具有相应寄生变量的占空比标度上的最大受影响区域。已经对以数字方式实现的三个基本DC-DC转换器(即降压,升压和降压-升压电路)进行了详细的稳定性分析。通过在PSCAD / EMTDC中执行的仿真验证了分析结果。 FPGA控制器被视为DC-DC转换器的数字控制器,并通过实验验证结果。

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