Copper Laminated Bus Bars
Products Description
Copper Laminated Bus Bars are not traditional single copper busbars or cable bundles, but rather power distribution layers within data centers and UPS uninterruptible power supplies. In server racks, UPS inverter cabinets, and high-frequency switching power supply systems, they perform low-impedance reconstruction and directional distribution of large current pulses between rectifier/inverter modules, energy storage units, and output terminals. They also serve as a structural electrical interface between power semiconductor devices (IGBTs, SiC MOSFETs) and filter capacitors.
Physically, they are a multilayered functional composite material of alternating conductor and insulator laminations: positive and negative copper conductors are separated by an extremely thin insulating medium, forming a rigid, integrated structure through vacuum hot pressing. This laminated geometry not only provides a large current path but also actively cancels parasitic magnetic flux generated by transient current changes through the antiparallel flow of positive and negative currents, thereby suppressing stray inductance of the busbar system to the nanohenry (nH) level. For the switching frequencies of tens to hundreds of kilohertz in the UPS inverter bridge arm and the server PSU (Power Supply Unit), this characteristic directly determines the amplitude of voltage spikes and the switching losses of power devices.
Material Advantages: Guaranteed Performance and Lifespan
High Conductivity Oxygen-Free Copper (C11000/T2)
Conductivity exceeds 100% IACS. We implement strict grain size control on the copper material to ensure no microcracks occur after cold bending.
Advanced Insulating Film Materials
Utilizing high-temperature resistant, high-dielectric-strength special polyimide (PI) or polyester (PET) films. Possessing excellent flame-retardant properties (compliant with UL94 V-0 standards) and long-term resistance to thermal aging, ensuring the insulation layer does not carbonize or become brittle under high load conditions.
Environmentally Friendly Coating Technology
Contact surfaces can be plated with bright tin, matte tin, or silver. While providing extremely low contact resistance, the Laminated Bus Bar for Supercomputer Circuit Board also possesses excellent resistance to sulfidation and oxidation, adapting to the microenvironmental challenges of data center server rooms.
Main Functions: System-level Empowerment for High-Frequency Power Conversion
High-Frequency Converter Circuit Inductive Reactance Suppression
Multi-Layer Composite Structure Connection Bar provides a physical path for ultra-low parasitic inductance, suppressing voltage spikes during IGBT/SiC turn-off, reducing switching losses and device voltage stress, and ensuring power module safety.
Rigid Integration of Multiple Power Nodes
Provides high-density rigid connection between the large-capacity thin-film capacitor array on the DC side, power modules, and output terminals, simplifying system assembly and eliminating the risk of loosening in traditional cable connections.
High-Density Heat Convergence and Dissipation
As a direct carrier of heat-generating conductors, the Laminated Busbar for Electric Cars uniformly diffuse the concentrated heat flow from power devices through a large-area copper layer and conduct it to external heat sinks, functioning as a heat dissipation plate.
Detailed Showcase: Craftsmanship Refined Under the Microscopic Spectrum
| Anti-cutting protection and chamfered countersunk holes | All screw mounting holes undergo precision countersinking and deburring to ensure 100% contact between the nut surface and the copper layer during tightening, preventing stress concentration from cutting the copper foil grains; the hole wall insulation layer slightly recoils and forms a rounded protection to prevent damage to the hole's perimeter insulation during tightening. |
| Local thickening and anti-oxidation plating of exposed terminals | In areas requiring external wiring, thickness is increased through localized welding or riveting to enhance mechanical strength; the surface is treated with pure silver or tin plating, which not only reduces contact resistance but also maintains the interface's anti-oxidation and anti-adhesion properties during countless insertion/removal and thermal cycles. |
| Anti-creep micro-ridge design at the insulating edge | In the edge area exposed by two layers of copper foil with opposite polarities, the insulating layer is deliberately extended outward to form a micron-level ridge. The surface creepage path is forcibly lengthened by physical geometry, blocking the conductive water film channel that may form in a high-humidity environment. |
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We not only offer standardized Laminated Bus Bar for Router Backplane Distributions products, but also provide integrated development support for engineering customers, from conductor design and insulation solutions to mass production, by combining UPS structure, current path, thermal management, and assembly processes, helping projects achieve a better balance between high reliability and long-term stable operation.
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