锂离子电池的现代储能系统由于其高效和可靠的性能，在各类应用中得到了广泛的采用。然而，确保系统的安全性和稳定性需要对每个电池单元进行严格监控，以防止电池的不平衡、过度充电、深度放电或过热现象。实现这一目标需要为每个电池单元或电池阵列提供独立的隔离电源电压控制电路。

对于标称电压高达48V的电池阵列，通常可以使用提供500V或1600V隔离屏障的标准工业DC/DC电源转换器模块。然而，对于那些需要更高功率并连接到交流电源的系统，电池阵列电压可能达到600-800V，这就需要具有更高隔离屏障的解决方案。

低隔离电容增强抗噪能力

P-DUKE的医疗电源转换器系列具有5kV隔离屏障，超过了常规4kV的需求。在该项目中，选择了MPD30-24S12，它可以从公共24V直流总线产生必要的12V/30W电源电压。

典型的工业30W DC/DC电源转换器的输入输出电容可达1500pF。如果并联使用多达200个转换器，电池单元（通过充电器连接到交流电网）和24V总线之间的总电容可能达到300nF，导致交流漏电流超过20mA。超过10mA的电流可能导致严重的触电和事故。

MPD30-24S12的输入输出电容仅20pF，因此200个转换器并联后的总电容仅为4nF，漏电流小于1mA。这样的低电容也避免了瞬态或任何噪声从交流/电池侧跨转换器耦合到中央电池管理系统的敏感通讯信号。

通过这一解决方案，4kV隔离和低漏电流要求得到了很好的满足。

通信和电源解决方案

对于整个安装中的通信，中央BMS控制器使用Wifi路由器，通过以太网由25W的53V电源供电。根据安装，电源电压可以由230Vac主电源或内部24Vdc总线产生。对于230Vac，可以使用TSD30系列转换器。它还提供Din导轨式版本，便于安装在控制器机架中。

成功案例表明，通过RCD30系列转换器可以从24Vdc总线产生53V电压，并将输出从54V调整至53V。它还配有集成散热器，易于冷却。

P-DUKE产品应用

MPD30/MPD30W系列是一系列30W DC/DC电源转换器，具有增强型5000Vac隔离电压，符合医疗应用的要求。该系列具有不同的输入电压范围，并提供单路或双路输出。该系列符合2MOPP标准，电气间隙和爬电距离为8毫米。这使得它们不仅适用于医疗设备，也适用于其他需要高隔离度和极低输入输出电容的应用。

TSD30系列是一款适用于Din导轨式应用的即用型交流/直流解决方案。与RCD30W系列一样，它为各种应用提供不同的输出电压和安装选项。

 

The modern energy storage system of lithium-ion batteries has been widely adopted in various applications due to its efficient and reliable performance. However, ensuring the safety and stability of the system requires strict monitoring of each battery unit to prevent battery imbalance, overcharging, deep discharge, or overheating. To achieve this goal, it is necessary to provide independent isolated power supply voltage control circuits for each battery unit or battery array.
For battery arrays with a nominal voltage of up to 48V, standard industrial DC/DC power converter modules that provide 500V or 1600V isolation barriers can usually be used. However, for systems that require higher power and are connected to AC power sources, the battery array voltage may reach 600-800V, which requires solutions with higher isolation barriers.
Low isolation capacitance enhances noise resistance
The P-DUKE medical power converter series has a 5kV isolation barrier, exceeding the conventional requirement of 4kV. In this project, MPD30-24S12 was selected, which can generate the necessary 12V/30W power voltage from the common 24V DC bus.
The input and output capacitance of a typical industrial 30W DC/DC power converter can reach 1500pF. If up to 200 converters are used in parallel, the total capacitance between the battery unit (connected to the AC grid through a charger) and the 24V bus may reach 300nF, resulting in an AC leakage current exceeding 20mA. A current exceeding 10mA may cause serious electric shock and accidents.
The input and output capacitance of MPD30-24S12 is only 20pF, so the total capacitance after 200 converters are connected in parallel is only 4nF, and the leakage current is less than 1mA. This low capacitance also avoids transient or any noise coupling from the AC/battery side converter to the sensitive communication signal of the central battery management system.
Through this solution, the requirements for 4kV isolation and low leakage current have been well met.
Communication and Power Solutions
For communication throughout the installation, the central BMS controller uses a WiFi router and is powered by a 25W 53V power supply via Ethernet. According to the final installation, the power supply voltage can be generated by a 230Vac main power supply or an internal 24Vdc bus. For 230Vac, TSD30 series converters can be used. It also offers a Din rail version for easy installation in the controller rack.
Successful cases have shown that the RCD30 series converter can generate a 53V voltage from the 24Vdc bus and adjust the output from 54V to 53V. It also comes with an integrated heat sink for easy cooling.
P-DUKE product application
The MPD30/MPD30W series is a series of 30W DC/DC power converters with enhanced 5000Vac isolation voltage, which meets the requirements of medical applications. This series has different input voltage ranges and provides single or dual output. This series complies with the 2MOPP standard, with an electrical clearance and creepage distance of 8 millimeters. This makes them suitable not only for medical devices, but also for other applications that require high isolation and extremely low input/output capacitance.
The TSD30 series is a ready to use AC/DC solution suitable for Din rail applications. Like the RCD30W series, it provides different output voltages and installation options for various applications.