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Liebert Corporation patents


Recent patent applications related to Liebert Corporation. Liebert Corporation is listed as an Agent/Assignee. Note: Liebert Corporation may have other listings under different names/spellings. We're not affiliated with Liebert Corporation, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "L" | Liebert Corporation-related inventors


System and method of identifying path of residual current flow through an intelligent power strip

A system and method is disclosed for detecting a specific voltage phase, from a multiphase voltage source, and a specific outlet of an intelligent power strip, that is associated with a residual current flow. The method accomplishes this by using a system that employs a statistical time series analysis using a pearson's correlation coefficient calculation to measure the linear dependence between the discretely sampled residual current waveform and each phase and outlet's discretely sampled current waveforms, in turn. ... Liebert Corporation

System and method of identifying path of residual current flow through an intelligent power strip

A system and method is disclosed for detecting a specific voltage phase, from a multiphase voltage source, and a specific outlet of an intelligent power strip, that is associated with a residual current flow. The method accomplishes this by using a system that employs a statistical time series analysis using a pearson's correlation coefficient calculation to measure the linear dependence between the discretely sampled residual current waveform and each phase and outlet's discretely sampled current waveforms, in turn. ... Liebert Corporation

Adaptive pid control for chilled water crac units

The present disclosure relates to a proportional, integral, derivative (pid) control system for controlling a cooling component of a cooling unit. The system may make use of a pid actuator position controller, a memory in communication with the pid actuator position controller, and a plurality of look-up tables. ... Liebert Corporation

Method and device for controlling two-wire discharge circuit of battery

A method and device for controlling a two-wire discharge circuit of a battery, introducing a whole-bus voltage outer loop and an inductive current average value or inductive current actual value closed loop as a main control loop of the two-wire discharge circuit of the battery so as to guarantee a stable voltage of the whole bus. On the basis of the main control loop, duty ratios of switch transistors in respective discharge branches are adjusted to control the respective discharge branches to independently charge and discharge corresponding half-buses so as to balance the bus voltage. ... Liebert Corporation

System and method to maintain evaporator superheat during pumped refrigerant economizer operation

The present disclosure relates to a method for controlling a level of superheat during a pump mode of operation of a refrigeration system, wherein the refrigeration system can operate in either the pump mode or a compressor mode, and has an electronically controlled expansion valve (eev). A controller obtains a stored, predetermined pump differential pressure range able to be produced by a pump of the system. ... Liebert Corporation

Fin and tube-evaporator with mini-slab circuit extenders

An evaporator for a cooling system has a slab coil having a plurality of refrigerant circuits with each refrigerant circuit being a fin-and-tube assembly that extends across the slab coil. At least one of the refrigerant circuits has a mini-slab circuit extender that has a fin-and-tube assembly that extends across only a portion of the fin-and-tube assembly of that refrigerant circuit and is disposed in front of that portion of the fin-and-tube assembly of that refrigerant circuit.. ... Liebert Corporation

Method to reduce inrush currents in a transformer-less rectifier uninterruptible power supply system

A method reduces inrush currents in a transformer-less rectifier ups system when an input circuit breaker of the ups system is closed from an open position. The circuit breaker is coupled between an ac power input and an ac input of a rectifier of the ups system and a dc output of the rectifier is coupled to a dc bus of the ups system. ... Liebert Corporation

Systems and methods for detecting degradation of a component in an air conditioning system

A method including: determining whether a cooling system is operating in a cooling mode, such that the cooling system is not operating in a reheat mode, a humidification mode or a dehumidification mode; determining whether the cooling system is operating in a compressor mode, such that the cooling system is not operating in a pump refrigerant economization mode; determining whether the cooling system is at steady-state; and if the cooling system is operating in the cooling mode and the compressor mode and is at steady-state, evaluating one or more rules to determine if a degradation symptom exists for the cooling system. The method further includes: subsequent to the evaluation, generating a degradation evaluation value to indicate whether the one or more rules are satisfied; and based on the degradation evaluation value, generating an alarm signal or performing a countermeasure.. ... Liebert Corporation

Cooling system for high density heat loads

A pumped refrigerant cooling system having multiple pumping units for providing working fluid to a load to enable cooling of a space via the load. The pumped refrigerant cooling system operates the pumping units at less than capacity. ... Liebert Corporation

Hybrid air handler cooling unit with bi-modal heat exchanger

A hybrid air handler cooling unit has a bi-modal heat exchanger. In a direct expansion mode or a pumped refrigerant economization mode, the bi-modal heat exchanger is in a refrigerant path in parallel with first and second condenser coils and functions as a condenser coil. ... Liebert Corporation

System and method for rapid input and configuration of sensors for a hvac monitoring system

The present disclosure relates to a processor based system for using temperature information being reported by a plurality of sensors present within a predetermined environment and controlling how various ones of the sensors are grouped together into a plurality of groups for monitoring purposes. The system includes a software subsystem that generates an association matrix screen on a display system associated with a computer system being used by a user with receives the temperature information. ... Liebert Corporation

Cooling systems for small equipment rooms and methods of cooling small equipment rooms

A cooling system for an equipment closet in a building has a direct expansion cooling circuit. The cooling system has two basic modes of operation. ... Liebert Corporation

Pumped refrigerant cooling system with 1+1 to n+1 and built-in redundancy

A pumped refrigerant cooling system having cooling units with associated pumping units for providing working fluid to the cooling unit to enable cooling of a space. The pumped refrigerant cooling system also includes a redundant pumping unit which is activated when a primary pumping unit associated with a cooling unit becomes inactive. ... Liebert Corporation

System and method for modular data center

The present disclosure relates to a unit structure for use in forming a modular data center. The unit structure may have an elongated frame structure forming a rectangular-like subsystem, and may be adapted to be supported above a floor surface. ... Liebert Corporation








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