Case Study: Polish EV Charger Manufacturer Qualifies BONENS 3296 & 3362 for DC Fast-Charging Station Power Modules

Client Profile: A Polish power electronics manufacturer developing DC fast-charging stations (50kW-150kW) for the rapidly expanding European EV charging infrastructure market, with deployments across Poland, Germany, Czech Republic, and Baltic states.

Challenge

DC fast-charging station power modules require precision calibration of voltage and current feedback loops to meet the strict output accuracy requirements of CCS (Combined Charging System) and CHAdeMO charging standards. The power module design required both multi-turn trimmers for initial factory calibration (voltage reference circuits) and single-turn trimmers for field-serviceable adjustment points (current limit settings). The client's previous trimmer supplier — a well-known US brand — had recently implemented allocation policies limiting availability for non-automotive-tier customers, creating supply uncertainty for the client's growing production volumes.

BONENS Solution

Sichuan Qixing provided a matched pair solution: BONENS 3296 multi-turn cermet trimmers for precision factory calibration of voltage reference circuits, and BONENS 3362 single-turn cermet trimmers for field-adjustable current limit settings. Both series feature glass-glaze cermet elements providing excellent thermal stability in the high-temperature interior of power modules. Comprehensive technical documentation and reliability data supported the client's CE marking technical file requirements.

Results

Switching to BONENS 3296 and 3362 eliminated supply allocation risk while reducing blended trimmer costs by 19%. The enhanced documentation package accelerated CE marking compliance for the client's next-generation 150kW charger model. The client has since qualified BONENS as a preferred supplier for all passive component requirements in their charger product roadmap.