Franz Ramlohr

Title: Franz Ramlohr and Reversible DC Controller Measurement

Introduction

Franz Ramlohr is an inventor associated with Vienna, Austria, and Siemens Aktiengesellschaft. His patent work addresses accurate measurement of current in reversible direct-current controllers. The supplied information lists 2 patents.

Latest Patents

Ramlohr’s patents describe circuit arrangements for determining the polarity and magnitude of load current in reversible DC controllers.

One invention uses a bridge circuit with two bypass paths and a current transformer whose oppositely wound primary windings occupy diagonally positioned bridge arms. Electronic switches direct the load current through the bridge during operation and alternate its circulation between the bypass paths during pauses. The resulting transformer signals are processed to produce a pulse train indicating current polarity. A further embodiment adds a sample-and-hold stage to determine both the polarity and magnitude of the load current.

A related invention uses the transformer’s secondary winding with a full-wave rectifier and load resistor connected to a sample-and-hold stage. The sampling switch closes while current circulates through a bypass path, allowing the output signal to represent the actual load current. Together, these designs provide a way to measure current in a reversible controller while accounting for periods when the load drive pauses.

Career Highlights

Ramlohr’s listed inventions focus on electrical measurement and control. Their use of bridge circuits, current transformers, electronic switches, and signal-processing stages reflects a practical approach to monitoring load current in reversible DC systems.

Collaborations

Ramlohr is associated with Siemens Aktiengesellschaft. The supplied information also names Werner Pohl and Walter Kolzer as coworkers, though it does not specify their roles in the listed inventions.

Conclusion

Franz Ramlohr’s two listed patents address the measurement of load-current polarity and magnitude in reversible DC controllers, with designs intended to provide useful readings during both active operation and bypass periods.