David H Bennefeld

Title: The Innovative Contributions of David H. Bennefeld

Introduction

David H. Bennefeld is a notable inventor based in Anoka, Minnesota. He has made significant contributions to the field of battery technology, holding 2 patents that showcase his innovative spirit and technical expertise. His work primarily focuses on improving battery charging systems, which are essential for various applications in today's technology-driven world.

Latest Patents

One of Bennefeld's latest patents is a battery charger with an automatic change from current to voltage mode. This improved battery charger features a current-limiting transformer designed to supply a charging current efficiently. The transformer consists of primary and secondary coils wound around a core, incorporating a shunt path for a portion of the magnetic flux induced by the voltage on the primary. The design includes a pair of silicon-controlled rectifiers (SCRs) that are alternately triggered into their forward conductive states early in each alternating current half cycle. This mechanism allows for maximum charging current when recharging a substantially discharged battery. As the charging process continues and the battery voltage increases, a smooth transition from the current-controlled mode to the voltage-controlled mode occurs at a predetermined battery voltage. Once the transition is complete, the SCRs are triggered into conduction later in each cycle, providing a low or trickle current that can be sustained indefinitely without damaging the battery. The charger also features simple adjustments for determining the maximum current charging rate and the specific voltage at which the changeover begins. Additionally, it includes provisions to prevent an initial sudden current surge when powering on, thus avoiding unnecessary fuse blowouts.

Career Highlights

David H. Bennefeld is associated with Introl Corporation, where he continues to develop innovative solutions in battery technology. His work has contributed to advancements in the efficiency and safety of battery charging systems, making a positive impact on various industries.

Collaborations

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Conclusion

David H. Bennefeld's contributions to battery technology through his innovative patents demonstrate his commitment to enhancing the efficiency and safety of battery charging systems. His work continues to influence the field and pave the way for future advancements.