Generic Derivation of Dynamic Model for Half-Cycle DCM Series Resonant Converters
Generic Derivation of Dynamic Model for Half-Cycle DCM Series Resonant Converters
复制标题
DOI：
10.1109/tpel.2017.2703300
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
J. Huber;J. Miniböck;J. Kolar
中科院分区：
文献类型：
--
作者：
J. Huber;J. Miniböck;J. Kolar
串联谐振变换器（SRC）工作在半周期不连续导通模式（HC-DCM）下，在开环工作时实现了输入输出电压的电流隔离和紧密耦合，即在开环工作时，输入输出电压之间的电流隔离和紧密耦合。例如，具有最小的控制复杂性，这使得它适用于需要电流隔离的广泛应用。这封信首先解释了转换器的“DC Transformer”行为，然后提供了精确模拟转换器端子行为的无源等效电路的一般推导。所提出的通用推导产生已知的分析结果的理想化的情况下，但另外允许基于模拟或测量的波形的等效电路的参数化，从而促进高精度也在非理想的情况下。此外，它表明，一个非无限的磁化电感的结果在一个额外的负载无关的输入和输出电压之间的差异，并提出了相应的扩展的等效电路模型。通过10 kW/350 V/350 V HC-DCM SRC系统的仿真和测量验证了这些考虑。
The series resonant converter (SRC) operated in the half-cycle discontinuous-conduction-mode (HC-DCM) provides galvanic separation and a tight coupling of its input and output voltages in an open-loop operation, i. e., with minimum control complexity, which renders it suitable for a wide range of applications that require galvanic isolation. This letter first explains the “DC transformer” behavior of the converter and then provides a generic derivation of a passive equivalent circuit that accurately models the converter's terminal behavior. The proposed generic derivation yields the known analytic results for idealized cases, but additionally allows for a parametrization of the equivalent circuit based on simulated or measured waveforms, thereby facilitating high accuracy also in nonideal cases. Furthermore, it is shown that a noninfinite magnetizing inductance results in an additional load-independent difference between the input and the output voltage, and a corresponding extension of the equivalent circuit model is proposed. The considerations are verified by simulations and measurements of a 10 kW/350 V/350 V HC-DCM SRC system.