Patents Assigned to Liebert Corporation
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Publication number: 20090211743Abstract: A heat exchanger can have a manifold which includes a plurality of laminated sheets that allow a customization of the heat exchanger. The design can allow for a more optimal flow of coolant to areas of high load, thereby making the temperature distribution across the heat exchanger more uniform, or intentionally non-uniform. Furthermore, the laminated sheets can allow multiple circuits to be employed in the heat exchanger such that different coolants can be utilized therein and maintained separate from one another. The tubes can be microchannel tubes. A single set of manifolds can be used with multiple heat exchanger cores to provide a more compact heat exchanger. Mounting features can be integral with a group of the sheets.Type: ApplicationFiled: February 18, 2009Publication date: August 27, 2009Applicant: Liebert CorporationInventors: Timothy J. Schrader, Ian G. Spearing
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Publication number: 20090212631Abstract: A power supply includes an isolation transformer. The isolation transformer includes a primary winding and N secondary windings, where N is an integer. The primary winding receives a first alternating current voltage. Each of the N secondary windings generates a second alternating current voltage. M rectifiers convert the second alternating current voltages to a direct current voltage, where M is an integer. X inverters convert the direct current voltage to a third alternating current voltage, where X is an integer. A reference transformer is electrically coupled between the X inverters and output terminals of the power supply, is connected in parallel with the output terminals, and is configured to provide at least one of a neutral reference and a ground reference.Type: ApplicationFiled: February 18, 2009Publication date: August 27, 2009Applicant: Liebert CorporationInventors: Paul Taylor, James K. Martin
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Publication number: 20090210096Abstract: A data center has equipment racks in which electronic equipment is disposed and a climate control system that includes a computer room air conditioner (CRAC) and an air economizer. The climate control system includes a control module that controls the climate control system. The control module determines whether outside air is suitable for use in cooling the data center based on the dry bulb temperature and humidity of the outside air. If the outside air is not suitable for, only the CRAC is used to cool the data center. If the outside air is suitable for use, outside air and not the CRAC is used to cool the data center when the dry bulb temperature of the outside air is below a minimum outside air dry bulb temperature set point. The outside air is conditioned before it is introduced as supply air into the data center so that the supply air is above a minimum temperature.Type: ApplicationFiled: February 16, 2009Publication date: August 20, 2009Applicant: Liebert CorporationInventors: John F. Stack, Stephen A. Mowrer
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Publication number: 20090210095Abstract: An air conditioning (A/C) system that may have a plurality of air conditioning units disposed in different zones of an area that each operate to cool the different zones, a humidity sensor for sensing the humidity in the area, and a controller. The controller may be adapted to analyze a sensible heat load being experienced by each of the air conditioning units and to control a latent heat removal being performed by each air conditioning unit such that a percentage of latent heat removal performed by each air conditioning unit does not exceed a percentage of sensible heat removal being performed by each air conditioning unit.Type: ApplicationFiled: February 18, 2009Publication date: August 20, 2009Applicant: Liebert CorporationInventors: Terry D. Bush, John E. Saunders, John F. Christensen
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Publication number: 20090200868Abstract: In an uninterruptible power supply (“UPS”) having a flywheel storage module, switched rectifying devices of an AC/DC converter of the UPS are walked in after a utility power outage by initially firing the switched rectifying devices at a phase angle where the voltage output by the AC/DC converter to a direct current bus matches a depleted DC bus voltage. In an aspect, the initial phase angle is determined by the equation: ? = 180 ? ? deg - arcsin ? ( VDC VRMS * 2 ) where ? is the initial phase angle, VDC is the depleted DC bus voltage and VRMS is the RMS voltage of the utility power.Type: ApplicationFiled: January 7, 2009Publication date: August 13, 2009Applicant: Liebert CorporationInventors: John F. Christensen, Terry D. Bush, Mohammad N. Marwali
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Patent number: 7566988Abstract: An uninterruptible power supply (UPS) system includes a first UPS module that has a first power source, a second power source and a controller operable to selectively connect the first or second power source to a load. A second UPS module is connected in parallel with the first UPS module. The second UPS module also includes a first power source, a second power source and a controller operable to selectively connect the first or second power source to a load. The controller of the first UPS module gradually transfers power from the first power source of the first UPS module to the first power source of the second UPS module to detect the presence of the first power source of the second UPS module.Type: GrantFiled: June 12, 2006Date of Patent: July 28, 2009Assignee: Liebert CorporationInventors: Brian Heber, Terry D Bush, Mohammad Nanda Marwali, Paul Taylor
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Publication number: 20090161312Abstract: Mounting systems are provided for bringing a heat exchanger from a server rack into thermal contact with a heat exchanger from an electronics server. An engaging force is applied to the two heat exchangers to create thermal communication there between. A mounting mechanism is configured to isolate the engaging force applied to the two heat exchangers. The mounting mechanism may include an interlocking mechanism that prevents transfer of the applied force to the rest of the electronics server to lessen the possibility of disconnecting the electrical connections between the electronics server and the rack, and/or lessening mechanical stresses transferred to the electronics server and the rack chassis. The mounting mechanism also may be coupled to the electronics server locking mechanism such that the action of locking the electronics server into the rack causes the heat exchangers to engage in thermal contact.Type: ApplicationFiled: January 9, 2009Publication date: June 25, 2009Applicant: LIEBERT CORPORATIONInventors: IAN G. SPEARING, TIMOTHY J. SCHRADER
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Publication number: 20090129913Abstract: A conditioning unit can allow the blower to be easily translated from a first operable position in the conditioning unit to a second operable position external to the conditioning unit. The translation of the blower does not require the disconnection of the blower and, accordingly, does not require that the blower be disconnected and reconnected to the control system. Such capability can facilitate the installation of the conditioning unit into a variety of applications and allows the purchaser to customize the blower location based on the desired performance. The ability to customize the installation of the conditioning unit without requiring disconnection and reconnection of the blower can reduce the cost and expense associated with the installation into differing applications.Type: ApplicationFiled: July 2, 2008Publication date: May 21, 2009Applicant: Liebert CorporationInventors: Daniel J. Schutte, Gary A. Helmink, David W. Douglas, Benedict J. Dolcich, Anfu Zhong, Gang Xu, Lewis Marton, Luis A. Anjos, Peter M. Buckingham
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Publication number: 20090126008Abstract: Methods and systems are disclosed for automatically tracking and controlling the capacity ratings of UPS units. The methods and systems provide a central server or repository for storing the capacity ratings, grant kVA and grant code authorized for each UPS unit along with a unique security key for each unit. When a customer purchases a capacity upgrade, the server updates the capacity rating for the customer's unit and issues an upgrade grant that includes the new rating and the grant code. The upgrade grant may thereafter be downloaded by a service technician and used to upgrade the unit. Alternatively, the upgrade grant may be downloaded directly to the UPS unit, and the unit's software and/or firmware may perform the upgrade automatically. In either case, the upgrade may be performed through a software modification, thus eliminating the need for the technician to physically swap out hardware. Such an arrangement helps ensure that only authorized capacity upgrades are performed.Type: ApplicationFiled: November 8, 2007Publication date: May 14, 2009Applicant: LIEBERT CORPORATIONInventors: John S. FUCHIK, Bret P. Fox, Russell E. SHETLER, JR., Ricardo A. LUQUIAS, Xiao XUELI, Zhou DANGSHENG, Liu BO
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Patent number: 7511229Abstract: The present disclosure provides a method and system for mounting a current transformer in proximity to a circuit breaker of an electrical system. Generally, a plurality of current transformers (CTs) are provided to measure a plurality of branches from a main power supply and are accumulated on a sensor module. In at least one embodiment, the sensor module includes a molded polymer mounting support that can support the CTs. The polymer molded mounting support departs from the standard circuit board and is substantially less fragile. A wiring channel is provided within the sensor module so that CT output wiring can be safely routed to the output connector using as few as two soldered connections, rather than the typical six soldered connections required in existing branch monitoring systems. Multiple sensor modules can be stacked to allow continued alignment with the CTs and software/firmware/hardware can allow for any current polarity changes.Type: GrantFiled: May 29, 2006Date of Patent: March 31, 2009Assignee: Liebert CorporationInventors: Gerald R. Vlasak, Jeffrey M. Powell, Gregg J. Nelson, James K. Martin
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Publication number: 20090080999Abstract: A method of mounting a removable component to a mounting structure, comprising aligning an opening in the removable component with an opening in a mounting structure; aligning a toolless mechanical fastener with at least one of the openings; inserting a portion of the toolless mechanical fastener device through the opening in the removable component and the opening the mounting structure, contacting a head of the toolless mechanical fastener with an outer surface of the removable component; rotating the toolless mechanical fastener in a predetermined direction to a coupling position at some angle relative to its insertion position, contacting portions of the base of the toolless mechanical fastener with an inner surface of the mounting structure, and deforming at least a portion of the base to couple the removable component to the removable component between the head and the base of the mechanical fastener.Type: ApplicationFiled: September 24, 2007Publication date: March 26, 2009Applicant: LIEBERT CORPORATIONInventor: Phillip Richard DUNN
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Patent number: 7508669Abstract: A cooling device (1) for an electronic component (3), especially for a microprocessor, includes a heat sink (7, 9), which can be connected to the electronic component (3) to be cooled, such that the waste heat generated by the electronic component (3) is transferred and transported away via a thermal interface of the electronic component (3) on the heat sink (7, 9). The heat sink (7, 9) comprises a first heat sink part (7), which is formed for connection to the electronic component, and a second heat sink part (9), which is connected detachably to the first heat sink part (7), such that a low heat transfer resistance is given, wherein at least the predominant part of the waste heat is transferred to a coolant via the second heat sink part (9). A rack may store several electronic components (3) to be cooled, wherein each electronic component to be cooled is included in a respective system such as respective server for a data-processing system.Type: GrantFiled: June 28, 2004Date of Patent: March 24, 2009Assignee: Liebert CorporationInventors: Harald Fonfara, Herbert Göstl, Thorsten Miltkau, Markus Eberl, Ralf Mollik
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Publication number: 20090056348Abstract: A vapor compression cooling system having a control unit adapted to receive working fluid pressure or temperature, environment temperature or relative humidity, compressor digital output, or other cooling system information to control a condenser cooling fluid control valve to minimize flow changes through the valve.Type: ApplicationFiled: October 31, 2008Publication date: March 5, 2009Applicant: LIEBERT CORPORATIONInventors: Roger D. NOLL, Gary HELMINK, Michael Jason GLOECKNER, Russell C. TIPTON, Benedict J. DOLCICH
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Patent number: 7496285Abstract: A multi-pass parallel tube heat exchanger is disclosed. The multi-pass parallel tubes heat exchanger provides a compact, light and inexpensive heat exchanger that may be oriented in any direction. These features and others make the disclosed exchanger ideal for use in a restricted area such as that available when providing localized cooling systems. This design is more efficient than the prior art and allows for a versatile operation with multiple circuiting options for the flow path and enhanced performance with multiple fluid and heat transfer operations.Type: GrantFiled: July 16, 2004Date of Patent: February 24, 2009Assignee: Liebert CorporationInventor: Anthony S. Molavi
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Patent number: 7489051Abstract: The present disclosure provides a method and system using a power protector, such as an uninterruptible power supply (power protector) or a power line conditioner. An input of the power protector can be coupled to an output of one or more of circuit breakers using electrical buss bars for unique modularity and easy installation and replacement. Further, an input of a second set of circuit breakers can be coupled to an output of the power protector to backfeed the power through the second set of circuit breakers and out through the buss bar to one or more electrical loads. Additional power protectors can be used for capacity and/or redundancy. A stacked buss bar system can be used that consolidates the system into a compact assembly heretofore unknown in the industry. In at least some embodiments, the system can be compatible with standard panelboards having circuit breakers disposed therein.Type: GrantFiled: May 31, 2007Date of Patent: February 10, 2009Assignee: Liebert CorporationInventors: John S. Fuchik, James K. Martin, Russell E. Shetler, Jr., William A. Barcus, Peter A. Panfil
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Publication number: 20090031735Abstract: A vapor compression cooling system having a control unit adapted to receive working fluid pressure or temperature information to control a condenser cooling fluid control valve to minimize flow changes through the valve.Type: ApplicationFiled: August 1, 2007Publication date: February 5, 2009Applicant: LIEBERT CORPORATIONInventors: Roger D. NOLL, Gary HELMINK, Michael Jason GLOECKNER, Russell C. TIPTON, Benedict J. DOLCICH
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Publication number: 20090014548Abstract: A method of preventing condensation on equipment inside a temperature-controlled enclosure comprises measuring the temperature in at least one location inside the enclosure. The temperature inside the enclosure is compared with a safe temperature, at which the risk of condensation is reduced. The temperature inside the enclosure is increased until the safe temperature is achieved. A user is then notified that it is safe to access the enclosure.Type: ApplicationFiled: July 10, 2007Publication date: January 15, 2009Applicant: LIEBERT CORPORATIONInventors: Karl M. CRISS, David A. DUKES, Thomas E. HARVEY
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Publication number: 20090013716Abstract: A cooling system is provided that comprises: a refrigerant loop having a pump; an evaporator heat exchanger thermally coupled to a heat source, the evaporator plumbed in the loop; a condensing heat exchanger and a receiver plumbed in the loop; and an equalizing conduit plumbed between an inlet to the condenser and the receiver and comprising a flow regulating valve.Type: ApplicationFiled: February 20, 2008Publication date: January 15, 2009Applicant: LIEBERT CORPORATIONInventor: Ian SPEARING
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Patent number: 7477501Abstract: The present disclosure provides a method and system for mounting a current transformer in proximity to a circuit breaker of an electrical system. Generally, a sensor assembly contains a plurality of current transformers (CTs) for measuring power wires from a main power supply. To accommodate measuring a greater number of wires than one sensor assembly can service, a plurality of sensor assemblies can be mounted end-to-end. The sensor assemblies can have symmetrical recessed portions that laterally align when mounted end-to-end by inverting one of the sensor assemblies. The lateral alignment allows CTs mounted lateral to the recessed portions to be aligned with corresponding circuit breakers, so that wires passing from the circuit breakers are aligned with the CTs, reducing bending stresses on the CTs in contrast to prior efforts. Changes in polarity caused by the inversion can be adjusted by software, firmware, hardware or a combination thereof.Type: GrantFiled: May 29, 2006Date of Patent: January 13, 2009Assignee: Liebert CorporationInventors: Gregg J. Nelson, Gerald R. Vlasak, James K. Martin, Jeffrey M. Powell
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Publication number: 20090009001Abstract: A serial communications bus is utilized to send key action data between parallel UPS units. The communications bus is used to transmit data at the zero crossing of the critical bus voltage. Each UPS unit then takes action based upon the event data received at the next zero crossing of the critical bus voltage.Type: ApplicationFiled: July 5, 2007Publication date: January 8, 2009Applicant: LIEBERT CORPORATIONInventors: Mohammad Nanda Rahmana MARWALI, Kevin Kim ESCHHOFEN, John Franz CHRISTENSEN, Brian Paul HEBER