Abstract: A water collection system is provided for an indirect evaporative cooler. The water collection system includes a housing having an open bottom, a front wall, a back wall, and two end walls, which together define an interior region of the housing. The water collection system further includes a plurality of tube assemblies each extending through one of the front wall and the back wall of the housing and disposed within the interior region of the housing. The water collection system further includes a plurality of panel assemblies disposed within the interior region of the housing above the plurality of tube assemblies. Each panel assembly is associated with a respective tube assembly to channel fluid to the tube assembly. A method of collecting and distributing water within an indirect evaporative cooler configured to spray water on a heat exchanger is further disclosed.

Abstract: The present disclosure relates to a controller, a circuit and method for controlling a power converter using pulse width modulation (PWM). At least one logic block (13, 15, 16) of the controller is configured to remove a command (4) which is configured to control the other power semiconductor switch (2) in a half-bridge (1,2) so that the other power semiconductor switch (2) remains in a non-conductive state while an antiparallel diode (6) allows an electric current (5) to pass in one direction, called the diode's forward direction, while blocking current in the opposite direction. In case the diode (6) is conducting instead of the other power semiconductor switch during the duration of the state of the command, the switching command (4) for the latter is omitted.

Abstract: According to one aspect, embodiments herein provide an uninterruptible power supply comprising an input configured to receive input power, at least one battery having a state of charge and configured to provide battery power, an output configured to provide output power derived from at least one of the input power and the battery power, and a controller coupled to the battery and configured to generate an expected runtime for the battery based on at least a battery temperature time parameter and a state of charge time parameter.

Abstract: Methods of controlling a cooling unit and embodiments of a cooling unit are disclosed. A method of improving efficiency of the cooling unit includes detecting a degree of opening of a hot gas bypass valve configured to divert a portion of coolant from a compressor to a heat exchanger of the cooling unit, and adjusting a condenser discharge pressure based on the detected degree of opening. Aspects may increase cooling efficiency at partial cooling requirements. Fluctuations in refrigerant pressure at low cooling capacities and condenser medium inlet temperature may be avoided. Minimum condenser water inlet temperature for a water-cooled cooling unit may also be reduced.

Abstract: According to one aspect, an uninterruptable power supply (UPS) is provided. The UPS includes a first input constructed to receive input power from a first power source, a second input constructed to receive input power from a second power source, an output constructed to provide output alternating current (AC) power derived from at least one of the first power source and the second power source, a bypass switch having an on state and an off state coupled between the first input and the output, an inverter coupled between the second input and the output and constructed to generate the output AC power. The UPS being constructed to quickly transition from a first power delivery mode that provides output power derived from the first power source to a second power delivery mode that provides output power derived from the second power source.

Abstract: According to one aspect, embodiments of the invention provide a UPS system comprising an input configured to receive input AC power, an output configured to provide output AC power to a load, a converter coupled to the input and configured to convert the input AC power into DC power, a DC bus configured to receive the DC power, an inverter configured to convert the DC power from the DC bus into output AC power and provide the output AC Power to the output, and a controller configured to receive an output AC output voltage level selection from a user, operate the inverter to generate the output AC power having an AC voltage level based on the output AC output voltage level selection, and operate the converter to generate the DC power having a DC voltage level based on the output AC output voltage level selection.

Abstract: According to one aspect, embodiments of the invention provide a gate driver comprising a level shifter circuit configured to be coupled to a controller, to receive control signals from the controller, each control signal having a voltage with respect to a control ground, and to redefine the voltage of each control signal with respect to a chip ground to generate redefined control signals, a gate driver chip coupled to the level shifter circuit and configured to be coupled to at least one semiconductor device, the gate driver chip further configured to provide bipolar control signals to the at least one semiconductor device based on the redefined control signals, and at least one power source configured to provide at least one positive supply voltage to the gate driver chip and at least one negative supply voltage to the gate driver chip and to the chip ground.

Abstract: Disclosed herein are methods and systems for providing electrical power to an electrical system. An automatic transfer switch selectively provides power to the electrical system from one or more power supplies through a plurality of power outlet connectors of the automatic transfer switch. The plurality of power outlet connectors of the automatic transfer switch are selectively electrically connected to the one or more power supplies responsive to a state of health of the one or more power supplies.

Abstract: Disclosed is a control circuit for control of a semiconductor switching device, such as an IGBT. The control circuit comprising a first feedback path between a first electrode and a control electrode of said semiconductor switching device which has a capacitance. The circuit is operable such that the capacitance in the first feedback path is dependent on the voltage level at said first electrode. In another embodiment the control circuit is operable such that a feedback signal begins to flow in the first feedback path immediately as the semiconductor switching device begins switching off, thereby causing a control action on the semiconductor switching device.

Abstract: A busbar connector assembly includes a dynamic head configured to be secured to one of a busbar and an electronic device, a static head configured to be secured to the other of the busbar and the electronic device, and a connector configured to flexibly secure the dynamic head and the static head so that the dynamic head is capable of moving relative to the static head. Other aspects of the busbar connector assembly and methods of connecting an electronic device to a busbar are further disclosed.

Abstract: A system and method for providing energy assessment and optimization in a data center that includes at least one cooling provider, and at least one cooling consumer, the at least one cooling consumer having cooling requirements. The method according to one aspect includes receiving data regarding cooling availability and power consumption for the at least one cooling consumer, cooling capacity of the at least one cooling provider, and a physical relationship between the at least one cooling consumer and the at least one cooling provider in the data center, storing the received data, determining airflow distribution effectiveness between the at least one cooling consumer and the at least one cooling provider, and displaying at least one value representative of the effectiveness of the distribution of airflow in the data center between the at least one cooling consumer and the at least one cooling provider.

Abstract: Methods and apparatus are provided that can be used to control a set of power switches operating as a power converter.

Abstract: According to various aspects and embodiments, a power device is provided. The power device includes an input configured to receive input power, and a controller coupled to the input. The controller is configured to sample a voltage waveform of the input power, compare the sampled voltage waveform with a sinusoidal reference waveform to determine a plurality of offset values, and shape an input current waveform of the power device to be substantially similar to the voltage waveform based on the plurality of offset values.

Abstract: Methods and apparatuses for providing a solution for incompatibility between nonsinusoidal waveform uninterruptible power supply (UPS) systems and active power factor correction (PFC) loads are disclosed. An embodiment of the invention includes generating a nonsinusoidal signal waveform (e.g., a voltage waveform), to be delivered to the load, with a pulse width modulation (PWM) duty width, sampling the nonsinusoidal signal waveform to collect output signal samples, and adjusting the duty width to control the nonsinusoidal signal waveform as a function of the output signal samples to deliver a desired signal characteristic (e.g., RMS signal level) to the load. In embodiments of the invention, the output duty width is adjusted differently in cases of rising and falling power consumption, respectively, by the load.

Abstract: A plug-in unit configured to be coupled to a busway includes a housing configured to be secured to the busway, an electrical coupling assembly coupled to the housing and configured to move between an uncoupled position in which the plug-in unit is uncoupled to the busway and a coupled position in which the plug-in unit is electrically coupled to the busway, and an actuator assembly coupled to the housing and the electrical coupling assembly. The actuator assembly is configured to move the electrical coupling assembly between the uncoupled and coupled positions and to secure the plug-in unit to the housing. Other embodiments of the plug-in unit and a method of securing a plug-in unit to a busway are further disclosed.

Abstract: A method of manipulating a cooling system of a data center includes designing a cooling system to address cooling needs in the data center, selecting components for the cooling system including one or more distribution boxes adapted to distribute coolant, one or more cooling racks, and flexible tubing to connect the one or more distribution boxes to the one or more cooling racks, assembling the components for the cooling system in the data center, operating the cooling system, identifying hot spots within the data center, and adjusting the location of one or more cooling racks in the data center based on the indentified hot spots in the data center.

Abstract: An interface apparatus is configured to be mechanically secured and electrically coupled to a busway. The interface apparatus includes a housing configured to mate with the busway and a plug-in interface coupled to the housing. The plug-in interface is configured to receive a plug-in unit. The interface apparatus further includes an electrical coupling assembly coupled to the housing and configured to move between an uncoupled position in which the plug-in interface is uncoupled to the busway and a coupled position in which the plug-in interface is electrically coupled to the busway. The interface apparatus further includes an actuator assembly coupled to the housing and the electrical coupling assembly. The actuator assembly is configured to move the electrical coupling assembly between the uncoupled and coupled positions and to secure the plug-in unit to the housing.

Abstract: A method of operating an uninterruptible power supply (UPS) includes generating, during a portion of an output cycle, a substantially sinusoidal output voltage responsive to a plurality of pulse width modulation (PWM) control signals provided to a power conversion circuit of the UPS, comparing the output voltage to a reference root mean square (RMS) voltage at each of a plurality of time intervals during the portion of the output cycle, calculating a PWM control signal scaling factor based on each of the comparisons to the reference RMS voltage, and maintaining the output voltage at substantially the reference RMS voltage by applying the calculated PWM control signal scaling factor to at least one of the plurality of PWM control signals. The method may include detecting that the output voltage has reached a maximum output voltage level and clamping the output voltage to a steady state output voltage reference level.

Abstract: At least one aspect of the disclosure is directed to an AC switching system. The AC switching system includes a first I/O, a second I/O, a first segment including a first plurality of switches, the first segment being coupled to the first I/O, a second segment including a second plurality of switches, the second segment being coupled with the first segment and coupled to the second I/O, a third segment including a diode, the third segment being coupled to the first I/O and coupled to a junction of the first segment and the second segment, and a fourth segment including a diode, the fourth segment being coupled to the second I/O and coupled to the junction of the first segment and the second segment.

Abstract: A system and method is provided for evaluating the transient cooling performance of a data center. In one version, the method includes receiving input data from a storage device, the input data including data center architecture information and operating data, performing transient cooling performance calculations for the data center using the input data, and displaying results of the transient cooling performance calculations, wherein the results include at least one of a cooling runtime and a maximum predicted temperature of the data center following a power outage of the data center.