Abstract: A heat exchanger comprising a pair of metal plates joined along corresponding mating surfaces, wherein at least one of the metal plates comprises a plurality of connected recesses which form a fluid circuit between the plates when the plates are joined, wherein the fluid circuit comprises an inlet, an inlet manifold, an outlet, an outlet manifold, and a plurality of flowpaths extending between and fluidly connecting the inlet manifold and outlet manifold, and wherein one or more of the plurality of flowpaths comprise a fluid passage and a flow constriction and wherein a ratio of the hydraulic diameter of the flow constriction to the hydraulic diameter of the fluid passage increases with increasing distance from the inlet.

Abstract: A braking system for an elevator includes an electromagnetic brake operably connected to an elevator car, and a control circuit operably connected to the electromagnetic brake. The control circuit includes a switching mechanism configured to selectively modify a rate of engagement of the electromagnetic brake to selectively modify a rate of deceleration of the elevator car. The switching mechanism has a first position, a second position and a third position, to selectively modify the rate of engagement.

Abstract: An active harmonic filter (AHF) compensation assembly is provided. The AHF compensation assembly includes first wiring carrying input current, second wiring carrying output current and being electrically coupled to the first wiring for reception of the input current and first and second AHFs. The first AHF determines a first harmonic component of the output current and outputs a first signal configured to cancel the first harmonic component to the first wiring at a first location defined along the first wiring. The second AHF determines a second harmonic component of the output current and outputs a second signal configured to cancel the second harmonic component to the first wiring at a second location defined along the first wiring upstream from the first location.

Abstract: A transport refrigeration system includes a compressor, condenser and evaporator; an inverter providing a multiphase, AC output voltage to the compressor; and a DC power system having an output coupled to the inverter, the DC power system including: a primary power source; a DC-AC converter connected to the primary power source; a transformer connected to the DC-AC converter; an AC-DC converter connected to the transformer, the AC-DC converter outputting a primary DC voltage; a secondary power source; and a DC-DC converter connected to the secondary power source, the DC-DC converter outputting a secondary DC voltage; a combination of the primary DC voltage and the secondary DC voltage provides the output of the DC power system.

Abstract: A method for controlling an asynchronous induction motor, a control device for implementing the method, a motor system including the control device, and a computer-readable storage medium on which a computer program for implementing the method is stored. The method for controlling the asynchronous induction motor includes: A. determining a target value of d-axis current according to a target value of q-axis current of the asynchronous induction motor; B. determining a correction value of the target value of the d-axis current based on q-axis voltage and d-axis voltage of the asynchronous induction motor; and C. determining target values of the d-axis voltage and the q-axis voltage of the asynchronous induction motor based on the correction value of the target value of the d-axis current and the target value of the q-axis current.

Abstract: A transportation refrigeration system including: a transportation refrigeration unit including a compressor, one or more valves, and a controller; an energy storage device configured to provide electrical power to the transportation refrigeration unit; and an intelligent charging connector in electrical communication with the energy storage device and/or the transportation refrigeration unit, the intelligent charging connector being connectable to a power grid and being configured to selectively control a provision of electrical power to the transportation refrigeration unit from the energy storage device and/or the power grid by transitioning the provision of electrical power to the transportation refrigeration unit from being supplied by the energy storage device or the power grid in response to the intelligent charging connector being connected to the power grid or in conjunction with the intelligent charging connector being disconnected from the power grid, respectively.

Abstract: A power electronics assembly includes one or more power electronics devices, and a heat exchanger to which the one or more power electronics devices are mounted. The heat exchanger includes a heat exchanger body, and one or more fluid pathways extending through the heat exchanger body, the heat exchanger configured to transfer thermal energy from the one or more power electronics devices into a flow of fluid passing through the one or more fluid pathways. A plurality of fins extend from an outer surface of the heat exchanger body. The flow of fluid is a flow of liquid refrigerant diverted from a condenser of a heating, ventilation, and air conditioning (HVAC) system.

Abstract: A method of forming a power electronics assembly includes forming a plurality of pathway openings in a heat exchanger body and inserting a tubular member in each pathway opening of the plurality of pathway openings. The tubular member includes a plurality of internal surface enhancements. An interference fit is defined between the tubular members and the heat exchanger body via one or more of mechanical or thermal expansion to define a plurality of fluid pathways in the heat exchanger. One or more power electronics devices are installed to the heat exchanger body.

Abstract: An air conditioning system includes a compressor including a motor, a condenser, and an evaporator; a drive including converter and an inverter, the converter and the inverter including power switching devices; a temperature sensor configured to sense a temperature in at least one of the converter and the inverter; a controller configured to communicate with the temperature sensor, the controller configured to provide a control signal to the inverter, the controller configured to execute: monitor the temperature; compare the temperature to a threshold; when the temperature exceeds the threshold, executing an operation to reduce a switching frequency of the power switching devices in the inverter.

Abstract: A system and method for reforming an electrolytic capacitor. A method includes disabling a primary switch, the primary switch selectively couples a power supply to the electrolytic capacitor, and providing a signal to one or more reforming switches to control the one or more reforming switches. The method includes completing the reforming process based at least in part on a detection of a voltage of the electrolytic capacitor or a duration of time, and disabling the one or more switches responsive to completing the reforming process.

Abstract: An air conditioning system includes a compressor including a motor, a condenser, and an evaporator; a drive including an inverter providing a multiphase, AC output voltage to the motor; a current sensor configured to sense an output current generated by the inverter; a controller configured to communicate with the current sensor and the inverter, the controller configured to provide a voltage command to the inverter, the controller configured to execute operations including: monitor the output current generated by the inverter; compare the output current to a threshold; determine the occurrence of an over current condition when the output current exceeds the threshold; when an over current condition is detected, reducing the voltage command to the inverter.

Abstract: A chiller system is provided and includes a compressor, a variable frequency drive (VFD) to drive the compressor at variable frequencies and a chiller controller to ascertain a chiller condition and to command the VFD to drive the compressor at one of the variable frequencies based on the chiller condition at a first sampling rate. The VFD is configured to drive the compressor at the one of the variable frequencies responsive to being commanded by the chiller controller, to ascertain the chiller condition at a second sampling rate, which is substantially higher than the first sampling rate, and to alert the chiller controller accordingly.

Abstract: A method and a system for operating a heating, ventilation, and air conditioning (HVAC) centric energy hub. A power conversion system is configured to condition power and is coupled to an HVAC system, a power grid, an energy storage device, an alternative energy source, and one or more loads. An energy management system is coupled to the power conversion system, the energy management system is configured to manage distribution of power from the power grid, the energy storage device, and the alternative energy source to the one or more loads and is further configured to communicate with energy management systems of other hubs.

Abstract: Provided are embodiments for a system and method for controlling a boost control circuit. Embodiments include a power supply and a boost converter circuit coupled to the power supply, wherein the boost converter circuit is operable to provide power to the load. Embodiments also include a 3-phase inverter coupled to the boost converter, wherein the 3-phase-inverter is operable to provide a 3-phase output, and a controller coupled to the boost converter and the 3-phase inverter. The controller can be configured to receive a voltage level of a power supply and a voltage level of a 3-phase inverter; compare a power threshold to at least one of: the voltage level of the power supply and the voltage level of the 3-phase inverter; and control an operation of the boost converter circuit to operate in a boost mode or a rectification mode based at least in part on the comparison.

Abstract: A heat exchanger assembly includes a housing having at least one area of heat flux and a fluid circuit arranged within an interior of the housing. The fluid circuit having an inlet manifold, an outlet manifold, and at least one fluid passage connecting the inlet manifold and the outlet manifold. The at least one fluid passage is positioned relative to the housing to perform localized cooling of the housing at the at least one area of heat flux. A cooling medium circulates through the fluid circuit.

Abstract: A power electronics assembly includes one or more power electronics devices, and a heat exchanger to which the one or more power electronics devices are mounted. The heat exchanger includes an inlet manifold and an outlet manifold, and one or more fluid pathways extending connecting the inlet manifold and the outlet manifold, the heat exchanger configured to transfer thermal energy from the one or more power electronics devices into a flow of fluid passing through the one or more fluid pathways. Thee one or more fluid pathways include one or more internal enhancements and channel configurations to enhance thermal energy transfer by promoting boiling of the flow of fluid and to reduce the pressure drop in the pathways under a two-phase flow condition. The flow of fluid is a flow of liquid refrigerant diverted from a condenser of a heating, ventilation, and air conditioning (HVAC) system.

Abstract: A heat exchanger assembly includes a heat exchanger and a power electronics module mounted to the heat exchanger. The power electronics module is thermally coupled to the heat exchanger at a heat sink interface. A thermal interface material is arranged between the heat sink interface and a surface of the heat exchanger and a gasket arranged between the heat sink interface and the surface of the heat exchanger.

Abstract: A power electronics assembly includes one or more power electronics devices, and a heat exchanger to which the one or more power electronics devices are mounted. The heat exchanger includes one or more fluid pathways extending through the heat exchanger to transfer thermal energy from the one or more power electronics devices into a flow of fluid passing through the one or more fluid pathways. The flow of fluid is a flow of liquid refrigerant diverted from a condenser of a heating, ventilation, and air conditioning (HVAC) system. The one or more power electronics devices includes at least one power electronics device located on each opposing lateral side of the heat exchanger.

Abstract: A drive for an air conditioning system includes a converter assembly including a Vienna rectifier having a converter capacitance across a positive DC bus and a negative DC bus; and an inverter assembly including an inverter capacitance across the positive DC bus and the negative DC bus, the inverter capacitance in electrical parallel with the converter capacitance; wherein the converter assembly and the inverter assembly are physically separate assemblies.

Abstract: A converter for an air conditioning system including a rectifier section configured to receive an AC input voltage; a voltage regulator section coupled to the rectifier section, the voltage regulator section configured to control a DC output voltage across a positive DC bus and a negative DC bus; and a controller in communication with the rectifier section and the voltage regulator section, the controller configured to control the converter such that the DC output voltage is greater than AC input voltage by an offset.