Visit of Romanian customers on Women's Day
-Discuss the design optimization scheme of inverter motherboard components together.
On March 8, 2025, Romanian customer representatives officially visited our company on Women's Day, and conducted in-depth discussions on the component requirements and design scheme of inverter motherboard. This talk focuses on the design of motherboard components with inverter power ranging from 20KW to 60KW, especially on the optimization and upgrading of component selection, size, capacity and voltage, so as to maximize the performance of the circuit board.
During the meeting, the roles of electrolytic capacitors, the key components in the inverter, were discussed in detail. As the core component of inverter circuit, electrolytic capacitor is not only used for filtering and stabilizing voltage, but also plays a vital role in efficient operation, long-term stability and high-frequency operation of inverter. By optimizing the specification and material selection of electrolytic capacitor, the overall performance of inverter can be effectively improved, energy loss can be reduced and service life can be prolonged.
As the "heart" of photovoltaic system, the circuit board design of inverter should give consideration to efficiency, stability and volume optimization. The Romanian technical team pointed out that the current inverter has some problems such as high capacitor temperature rise and energy storage efficiency fluctuation under high voltage and high current scenarios. In view of this pain point, our company puts forward three optimization directions of electrolytic capacitors based on years of industry experience:
Accurate selection and parameter matching: Based on the requirements of the 20KW-60KW power section of the inverter, it is recommended to adopt a high-frequency low-impedance electrolytic capacitor with a withstand voltage of 450V-600V and a capacity of 2,200 μ f-4,700 μ f, so as to reduce the energy loss by reducing the equivalent series resistance (ESR) and optimize the charging and discharging rate to adapt to the dynamic load change.
Layout and heat dissipation innovation: In the limited space of the motherboard, a scheme of "multi-capacitors in parallel+distributed layout" is proposed, which replaces the traditional single large-size capacitor with a combination of multiple miniaturized capacitors, which not only reduces the local temperature rise (measured temperature drops by 15%), but also improves the redundant safety of the circuit.
Life-strengthening design: In view of the extreme climate in Eastern Europe, a 105℃ electrolytic capacitor with high temperature resistance and long life (life exceeding 8,000 hours) is customized, and the potting process and optimized design of air duct are matched to ensure the stable operation of the capacitor at -40℃ to +85℃.
At the meeting, our company shared a case of a European customer: by replacing the traditional electrolytic capacitor with a customized high-frequency and low-resistance model, the main board volume of the 60KW inverter was reduced by 18%, the full-load efficiency was improved to 98.2%, and the temperature rise of the capacitor was reduced by 22%. Romanian customers highly recognized this, and said that the solution is highly compatible with the demand of its localized products.
After several rounds of in-depth discussions, both parties unanimously agreed to reach a cooperation agreement on the solution of inverter circuit board components. This cooperation not only highlights our technical advantages in the field of component design, but also demonstrates our strong ability to provide one-stop component BOM services and overall solutions. From component selection to circuit board design to the delivery of complete solutions, our company can provide customers with customized and efficient solutions to meet their needs in different application scenarios.
