Abstract: A fuel cell module includes a fuel cell stack configured to produce an electrical output, power electronics circuitry configured to convert the electrical output of the fuel cell stack into a regulated output of the fuel cell module, module control electronics circuitry configured for communications within the fuel cell module and further configured for communications with master control electronics circuitry external to the fuel cell module, and a structure configured to connect together the fuel cell stack, the power electronics circuitry and the module control electronics circuitry as part of the fuel cell module that is unitary, and further configured for the unitary fuel cell module to be insertable as a unit into a multi-module system chassis.

Abstract: A device and method for determining a filter element is approaching an end of life obtains vacuum data corresponding to a vacuum at a filter element, and concludes the filter element is approaching an end of life based on the vacuum data as it relates to time in service. The end of life of the filter element may be based on detection of a knee in a vacuum curve derived from the vacuum data, high and low vacuum measurements over a specific time period deviating from one another by more than a prescribed amount, or high and low vacuum curves derived from the vacuum data trending apart from one another by more than a prescribed amount.

Abstract: A power converter for converting direct current (DC) power to alternating current (AC) power includes a first power converter section and a second power converter section connected in parallel with the first power converter section. A power rating of the first power converter section is substantially greater than a power rating of the second power converter section. A controller is operatively coupled to the first power converter section and the second power converter section, the controller configured to enable at least the first power controller section when a power demand placed on the power converter exceeds a prescribed power level, and disable the first power controller and enable the second power controller section when the power demand placed on the power converter is below the prescribed power level. An advantage of the power converter in accordance with the present disclosure is that it minimizes parasitic losses associated with larger power sections of the converter.

Abstract: A fuel cell module includes a fuel cell stack configured to produce an electrical output, power electronics circuitry configured to convert the electrical output of the fuel cell stack into a regulated output of the fuel cell module, module control electronics circuitry configured for communications within the fuel cell module and further configured for communications with master control electronics circuitry external to the fuel cell module, and a structure configured to connect together the fuel cell stack, the power electronics circuitry and the module control electronics circuitry as part of the fuel cell module that is unitary, and further configured for the unitary fuel cell module to be insertable as a unit into a multi-module system chassis.

Abstract: A transducer mechanism has a stacked piezo electric actuators driving arms rotating in different directions and having a structure such that the arms remain generally parallel to each other. A flexible member may be attached to the arms to obtain an extended stroke in a direction perpendicular to the axis of movement of the actuators.

Abstract: A transducer mechanism has a stacked piezo electric actuators driving arms rotating in different directions and having a structure such that the arms remain generally parallel to each other. A flexible member may be attached to the arms to obtain an extended stroke in a direction perpendicular to the axis of movement of the actuators.