Vertiv Corporation

Teledyne Instruments, Inc.

Jason Armstrong

Kevin Ray Ferguson

Phillip B Liescheski

Scott Cooper

Shannon Cushman

Paul Spieker

Casey Gilson

The present disclosure is directed to a rack power distribution unit (RPDU) that automatically and safely switches power to one or more receptacles. The RPDU includes one or more processors utilizing control algorithms that manage bistable relays so that in-rush current is minimized upon manual connection/disconnection of power to a load device. In particular, relay contact status (open/closed) is identified based on changes in RMS or peak voltage influenced by the load impedance. The RPDU is also configured to predict timings for voltage zero-crossing events. In this manner, and based on the determination of relay contact status and voltage zero-crossing prediction, open relay contacts are identified and safely closed at voltage zero-crossing.

Outlet in-rush current limiter for intelligent power strip

The present disclosure is a system and method for measuring AC residual current and DC residual current using a singular type-B residual current monitoring device. The system includes a sensor comprising two or more cores that measure residual AC current and residual DC current from two or more current carrying conductors through the cores that carry AC current and DC current. The system includes a controller that sends both an AC excitation current to the cores, as well as a DC nulling current that cancels out the DC residual current, allowing the system to then accurately measure the AC residual current. The system also includes a self-test feature that injects known quantities of both AC current and DC current through the sensor to determine if the sensor is functioning properly.

Residual current monitoring type B with integrated self-test system and method

Condensation mitigation devices and condensation prediction/detection techniques configured to prevent window condensation with reduced power consumption are disclosed. A condensation mitigation device is configured to predict and/or detect a window condensation event. The condensation mitigation device is powered on only during such an event, and the condensation mitigation device is powered off afterwards to conserve power.

Detection and correction of window moisture condensation

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Lincoln, NE, United States of America

Jason Armstrong