Single-stage charging rectifier based on a LLC resonant converter

基于 LLC 谐振转换器的单级充电整流器

• 批准号: 394222435
• 负责人: Professor Dr.-Ing. Joachim Böcker
• 金额: --
• 依托单位: Fachgebiet Leistungselektronik und Elektrische Antriebstechnik (LEA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/394222435?language=en
• 关键词: Single; stage; charging; rectifier; based

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.

电池通常用DC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线路电源。使用单级转换充电器，可以避免使用寿命限制电容和单独的PFC级，从而提高功率密度。然而，必须容忍脉冲充电电流，根据最近的发现，这不会损害电池。LLC拓扑结构上的先前工作确定了有希望的结果，但仍然存在以下公开问题：通过约束每半周期的电流传导间隔来优化符合PFC标准的正弦输入电压下的设计，并通过适应Transformer匝数比或两种措施的组合来考虑取决于充电状态的很大程度上变化的电池电压。控制概念的发展和增强，迄今为止，仅通过在部件公差和操作点灵敏度的约束下通过调试识别或在线自适应进行的关于命令动作的模拟来评估。通过将GaN功率器件与集成Transformer结合使用，使用更高的开关频率并降低零电压开关所需的无功功率，以实现高效率和功率密度，如果有效的话，集成变压器包含所有电感谐振组件。