Single-stage charging rectifier based on a LLC resonant converter

电池通常用直流电流充电。这就是为什么笨重的电解电容器缓冲单相充电器的脉冲交流功率。使用一级转换充电器，可以避免使用限制寿命的电容器和单独的PFC级，从而增加功率密度。然而，脉冲充电电流必须是可容忍的，根据最近的研究结果，它不会损害电池。之前对llc -拓扑的研究确定了有希望的结果，但仍然存在以下问题：通过限制每半个周期的电流传导间隔，在符合pfc标准的正弦输入电压下优化设计，并考虑根据充电状态通过调整变压器匝比或两种措施的组合来改变电池电压。开发和增强了一种控制概念，迄今为止仅通过调试识别或在线适应对部件公差和工作点灵敏度约束下的指挥行动进行了仿真评估。使用更高的开关频率和减少零电压开关所需的无功功率，通过将gan功率器件与集成变压器结合使用，如果有效，该变压器包含所有电感谐振元件，以实现高效率和功率密度。

Batteries are typically to be charged with DC-currents. That is why bulky electrolytic capacitors buffer the pulsing AC-line power of one-phase chargers. With one-stage conversion chargers, lifetime-limiting capacitors and a separate PFC stage can be avoided resulting in increased power density. However, a pulsing charge current must be tolerated, which does not harm batteries according to recent findings. Previous work on the LLC-topology ascertained promising results, but there are still open questions as follows: Optimising design at sinusoidal input voltage complying with PFC-standards by constraining the current conduction interval per half cycle and considering largely varying battery voltage depending on the state-of-charge by adapting the transformer turns ratio or a combination of both measures. Development and enhancement of a control concept evaluated so far only by simulations with respect to command action under constraints of component tolerances and operation point sensitivities by a commissioning-identification or an online-adaptation. Use of higher switching frequencies and reduction of reactive power required for zero-voltage switching by applying GaN-power devices in conjunction with an integrated transformer, which contains all inductive resonant components if effective, to achieve high efficiencies and power densities.