具备宽输入、输出电压范围的DC-DC模块能够满足多元应用场景需求，但会导致更大的器件电压应力、电流应力和电感伏秒，从而使得器件损耗、电感体积和损耗优化困难，制约了高效高密度的实现。本工作基于多电平技术和元胞化技术，提出了级联多电平Boost（Cascaded Multilevel Boost，CMBo）调压、元胞化DCX隔离的两级方案，降低了高电气应力导致的器件和磁性元件损耗。变频谐振驱动变压器实现DCX的多路隔离驱动，大幅减少驱动损耗和占板面积。

DC-DC modules with a wide input and output voltage range can meet the needs of multiple applications, but will lead to greater device voltage stress, current stress and inductor Volt-Sec, which makes device loss, inductor volume and loss optimization difficult, restricting the realization of high efficiency and high power density. Based on Multilevel technology and cellular technology, a two-stage scheme of Cascaded Multilevel Boost (CMBo) for voltage regulation and cellular DCX for isolation is proposed in this work, which reduces the loss of devices and magnetic components caused by high electrical stress. Frequency adjustable resonant drive transformer realizes multi-channel isolated drive of cellular DCX, greatly reducing drive loss and footprint.

• 输入电压范围: 200Vdc-400Vdc（270Vdc）
• 输出电压范围: 17Vdc-34Vdc（28Vdc）
• 额定工况效率: 98.1%（峰值），97.5%（满载，2.5kW）
• 多电平技术与元胞化技术
• 高频低损的变频谐振驱动技术

• Input voltage range: 200Vdc-400Vdc（270Vdc）
• Output voltage range: 17Vdc-34Vdc（28Vdc）
• Efficiency: 98.1%（peak），97.5%（full load, 2.5kW）
• Multilevel technology & Cellular technology
• Frequency adjustable resonant driver with high frequency and low loss

Fig. 1 Topology of two-stage cellular DC-DC

Fig. 2 Two-stage cellular DC-DC prototype

Fig. 3 Measured efficiency of two-stage cellular DC-DC