Thermo King Corporation

Lockheed Martin Corporation

Robert N Neddermeyer, Iii

Matthew S Nelson

Ashok Muralidhar

Gregory R Truckenbrod

Christopher Paul Henze

A mobile environment-controlled unit, such as an over-the-road compartment trailer, having an environmental-control system, such as a refrigeration unit, powered by an alternator and having a high-voltage alternating current (AC) bus. The unit incorporates a high resistance ground scheme and can incorporate a solid-state input module to detect phase-chassis faults. This combination provides an improvement in protection for mobile applications that cannot have a voltage reference (or neutral point) solidly connected to earth ground.

Vehicle or environment-controlled unit having a multiphase alternator with a protected high-voltage bus

The invention provides a mobile environment-controlled unit having a chassis, a compartment supported by the chassis, and an environmental-control system in environmental communication with the compartment. The environmental-control system includes a multiphase alternator powered by an internal combustion engine and supplies electrical power for the environmental-control system. The alternator has a first phase winding to generate a first high-voltage alternating phase current and a second phase winding to generate a second high-voltage alternating phase current. The environmental-control system further includes a magnetic sensor including a core, and a magnetic sensing device interconnected to the core and providing an output based on a sensed electromagnetic parameter.

Mobile environment-controlled unit having a magnetic sensor for a high-voltage alternating current bus

A system for reducing leakage current hazards is provided. The system includes an electronic component, an active shunt filter and a power source. The electronic component has a first component terminal coupled to a phase line and a second component terminal coupled to a ground. The active shunt filter device is coupled in parallel to the electronic component and has a first device terminal coupled to the phase line and a second device terminal coupled to the ground. The power source is coupled to the electronic component and the active shunt filter device via the phase line and the ground. The active shunt filter device monitors leakage currents generated by the electronic component and sets an impedance value to force any leakage currents from the ground to the phase line.

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Eagan, MN, United States of America

Robert N Neddermeyer, Iii