Laser welded connections
In a power supply capacitor, it is not only the film or the electrolyte that determines the performance, but also the quality of the internal contacts. Because it is precisely at these transitions that “capacity” becomes a real power path. High pulse and ripple currents permanently stress the contact points — thermally, mechanically and electrically. The difference between riveted and laser-welded connections lies in how stable and low-resistance these transitions remain over time, temperature and load.
Electrotechnical properties
Laser welding creates a continuous metallurgical connection. The transition is more defined, resistance is lower and, above all, more stable in the long term. This results in clear advantages:
- Lower contact resistance lower ESR in the real current path
- More constant characteristics during temperature changes and continuous load
- Better power distribution when connecting the films/tabs
- Higher pulse current resistance due to a stable connection without unwanted signal modulation caused by the contact
Macro-microphonic effects
We understand macro microphony as stabilization of the winding structure and the internal contact points against significant relative movements under load pulses.
Laser-welded connections are mechanically more stable than riveted connections and reduce the risk of load pulses leading to macromechanical movement at the contact point.
This supports a quieter power supply, particularly at high pulse currents.
Micro-microphonic effects
Micro-microphone effects occur when the slightest relative movements or contact modulations become visible as small, current-synchronous changes in resistance/impedance.
Laser-welded contacts are metallic throughout and minimize contact modulations. This results in a uniform, cleaner energy output, particularly in the fine details of dynamic signals.
Sound character
In playback, this is reflected in control and consistency: transients appear more stable, playback remains dynamic at levels and “compresses” less. Especially with complex music and high volumes, the more stable contact contributes to a quieter, more confident overall impression.
Typical uses
- Power supply reservoirs with high pulse currents (class AB, powerful amplifiers)
- High-current power supplies in active systems and professional applications
- Systems that focus on long-term consistency and reproducible performance
