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Double-Sided Bonded Fin Heat Sinks
Application of Dual-Sided Heat Dissipation Structure Bonded Fin Heat Sink (Double-Side Composite Fin Heat Sink)I. Brief Description of StructureThe dual-sided heat dissipation Bonded fin heatsink adopts a double-baseplate + double-sided high-density bonded fin sandwich structure: the heat source module is clamped between the upper and lower baseplates. Both sides of the baseplates can dissipate heat through bonded fin high-density fins to the airflow channels on both sides via convection. This design supports copper-aluminum hybrid material combinations, overcoming the limitations of extruded aluminum heatsinks which only allow single-sided heat dissipation and have a restricted aspect ratio.II. Core Advantages (Unique Features of the Dual-Sided Structure)Doubled Heat Dissipation Area: With the same footprint size, it effectively balances the temperature rise of high-power devices on both sides.Balanced Temperature Control & Hotspot Mitigation: Dissipates heat on both sides, reducing the temperature gradient caused by unidirectional heat transfer from the chip. This minimizes thermal cycling stress and extends the lifespan of IGBT/SiC modules.High Material Flexibility: The upper/lower baseplates and fins can be independently selected (e.g., copper baseplate + aluminum fins, or copper fins on both sides), balancing performance and cost. Heat pipes can also be embedded inside the baseplate for further heat spreading.Simultaneous Dual-Direction Heat Conduction: Heat is transferred from the power devices simultaneously upward and downward to the fin arrays on both sides. The heat dissipation area is nearly doubled, and the overall thermal resistance is significantly reduced. This design is ideal for high-power-density applications, limited chassis space, and scenarios requiring double-sided power device placement.Design Trade-off ReminderThe dual-sided structure doubles the number of fins, leading to a significant increase in overall airflow resistance. This requires matching with fans that have sufficient static pressure. The increased number of components and assembly steps also result in higher costs compared to standard single-sided bonded fin heatsinks. It is crucial to ensure unobstructed airflow in both the upper and lower air channels; blockage on one side will directly negate the benefits of the dual-sided heat dissipation.Application Scenarios for Dual-Sided Heat Dissipation Structure Bonded Fin Heat Sink (Double-Side Bonded Fin Heat Sink)I. Industrial Drives & High-Power Power SuppliesHigh-power frequency converters, high-voltage servo drives.Industrial uninterruptible power supplies (UPS), high-voltage DC power supplies, high-power DC regulated power supplies.High-power active power filters, SVG static reactive power compensation devices.Characteristics: These applications often involve stacking multiple power modules. The dual-sided heat dissipation solution simplifies the overall system airflow layout and reduces the overall equipment size.II. Lasers, Medical Equipment, and Specialized ApplicationsIndustrial fiber laser power supplies, RF laser drive power supplies.High-power power supply modules for medical imaging equipment.Traction converters for rail transit, military radar transmitters.III. Other Typical High-Heat-Flux EquipmentHigh-power induction heating power supplies, charging pile power modules, marine onboard converters.✅ How to Quickly Determine When to Prioritize the Dual-Sided Bonded Fin Heatsink?Power devices can be mounted on both sides, with heat sources clamped between the two baseplates.The chassis has reserved airflow channels on the top/bottom or both sides to enable dual-sided ventilation.The thermal solution is air-cooled (not liquid-cooled) and has stringent thermal resistance requirements.The equipment aims for miniaturization, and the heatsink mounting footprint area is limited.High-loss power devices like SiC/IGBT modules require strict hotspot thermal management.
How does the Bonded fin heat sink with high density fin apply for higher power electrical products heat dissipation? Bonded fin heat sinks break the constraints of conventional manufacturing processes with high-density fins to greatly expand heat dissipation area, significantly improving the cooling performance of high-power electronic products.What are the processing characteristics of Vansim’s bonded fin heat sinks? Independent thin cooling fins are bonded or soldered onto the base to achieve a far higher fin aspect ratio and fin density than traditional extruded aluminum heat sinks. 💡 Core Working Principle of Bonded Fin Heat Sinks Restricted by mold strength, the fin aspect ratio (ratio of fin height to fin pitch) of conventional extruded aluminum heat sinks generally cannot exceed 20:1. Accordingly, it is impossible to manufacture tall and densely packed fins within limited space.For bonded fin heat sinks, the base and fins are fabricated separately and then joined together via thermally conductive epoxy or soldering processes. This technology readily achieves an aspect ratio of 40:1 to 60:1 with extremely narrow fin pitches, and can reach over 100 fins per inch. Thanks to this assembly method, thermal design engineers are freed from the limitations of monolithic forming. They can independently optimize the manufacturing processes and materials for fins and bases. Typical combinations include copper fins with superior thermal conductivity mounted on an aluminum base, or high-conductivity copper bases paired with cost-effective aluminum fins.📈 How Bonded Fin Heat Sinks Address High-Power Challenges Solutions are reflected in the following three aspects:Substantially enlarged heat dissipation area: Featuring high-density, tall and thin fins, such heat sinks deliver a 200% to 300% larger heat transfer area within the same volume compared with conventional extruded aluminum heat sinks. A larger surface enables more sufficient contact with airflow to dissipate more heat. Test data shows that under identical conditions, a high-density fin heat sink (5.6 fins/cm) can dissipate up to 7 times more heat than a finless heat sink.Reduced thermal resistance and improved efficiency: The remarkable expansion of heat dissipation area greatly lowers the overall thermal resistance for heat transfer from heat sources to ambient air. Commercially available bonded fin heat sinks can achieve thermal resistance as low as 0.024 °C/W. This translates to minimal temperature rise per watt of power loss, making them highly suitable for devices with high heat flux density.Flexible material matching and design options: Hotspot issues of high-power components can be resolved with advanced designs. For instance, embedding heat pipes inside the base of a bonded fin heat sink rapidly transfers heat from localized hotspots (such as IGBT modules) and distributes it across the entire substrate, enabling all fins to work efficiently. Furthermore, designers may choose thermally conductive epoxy bonding, or higher-performance, structurally stronger soldering processes according to performance and budget requirements.⚖️ How to Achieve Design Trade-offs Between Performance and Cost Despite the excellent performance of high-density fin structures, the following factors need to be balanced during application:Air resistance and fan power consumption: Denser fins lead to higher airflow resistance. Higher-power fans are required to drive air through fin gaps; inadequate airflow will impair cooling performance. Therefore, fin pitch should be optimized based on the available static pressure of the system fan.Elevated costs: Compared with one-piece extruded aluminum heat sinks, the assembly processes (bonding and soldering) for bonded fin heat sinks increase manufacturing complexity and overall costs.Thermal resistance of bonding layer: Epoxy bonding introduces slight additional thermal resistance. Nevertheless, this impact can be kept extremely low by adopting an ultra-thin adhesive layer (normally less than 1 mm) and high-thermal-conductivity adhesives. As documented in technical literature, the temperature rise is generally less than 1 °C for each 25W fin unit. Please feel free to reach out Vansim if you have specific questions about costs, material selection (aluminum vs copper), or system integration with heat pipes, fans and other components.
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