Analysis of the insulation withstand voltage principle of Laminated Bus Bar: Structural design builds a solid barrier against high-voltage impulses

In power electronics, new energy inverters, and rail transit power supply systems, high-voltage surges, high-current oscillations, and localized insulation breakdowns are core challenges affecting the stability and lifespan of power connection components. Laminated Bus Bar, with their unique multi-layer composite structure design and leveraging the dual advantages of eliminating parasitic inductance and multi-layer dielectric isolation, possess excellent high-voltage resistance and high-current surge resistance, making them a core component for high-voltage, high-power equipment. The Laminated Busbar Design, through optimized laminated structure layout and upgrades from multiple dimensions including electromagnetic principles, insulation materials, and process structure, effectively addresses the industry pain points of traditional busbars being prone to breakdown and voltage spikes under high-voltage conditions, making them suitable for the demanding operating scenarios of various high-power power equipment.

Electromagnetic cancellation and reduction of parasitic inductance are the core foundations for laminated busbars to withstand high-voltage surges. Unlike traditional busbar structures, Laminated Inverter Bus bars employ a layout of multiple layers of conductor sheets stacked in parallel and close proximity, with only micron-level insulating media between the positive and negative conductor layers. During operation, the reverse currents in the positive and negative conductor layers generate mutually canceling magnetic fields, significantly reducing stray inductance in the circuit and effectively suppressing voltage spikes generated during high-speed switching of power electronic devices. This avoids the problem of continuous high-voltage surges impacting the insulation layer from the source, greatly reducing the risk of instantaneous high-voltage breakdown and providing a reliable electromagnetic environment guarantee for the stable operation of the insulation system. It is widely applicable to high-voltage applications such as high-frequency inverters and high-power power transmission equipment.

A high-performance dielectric isolation structure achieves uniform electric field distribution and strong insulation protection. High-performance insulating media such as polyimide, polyester film, and epoxy resin are used between the conductor layers of the laminated bus bar. These materials possess ultra-high volume resistivity and insulation breakdown threshold, enabling them to withstand high voltage differentials over long periods. Utilizing a mature hot-pressing lamination process, the conductors and insulation layers achieve a gapless, tight bond, completely eliminating the risk of partial discharge caused by air gaps and ensuring a uniform and stable electric field distribution during high-voltage operation. The Laminated BusBar, through the combination of high-quality insulating materials and precision manufacturing, significantly improves the overall insulation withstand voltage rating, confidently handling continuous electrical stress impacts under various high-voltage operating conditions.

Precision lamination sealing technology provides dual electrical and mechanical protection. Industry-leading vacuum hot-pressing lamination technology thermally fuses multiple conductors and insulating films into a single structure, forming a composite whole that combines rigidity and toughness. This composite laminated busbar structure can withstand high-intensity high-voltage electrical stress, buffer electromagnetic oscillations caused by high-current impacts, and resist external mechanical vibrations during equipment operation. Simultaneously, precise edge sealing effectively prevents moisture and dust from intruding into the interlayer, eliminating problems such as creepage, insulation aging, and breakdown, ensuring long-term stable operation of the equipment.

Leveraging our mature lamination process and insulation technology, we can customize high-impact, long-life Laminated Bus Bar to meet your needs. We sincerely invite customers from all sectors to discuss cooperation.