A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a building includes a monitoring device installed at the building, a monitoring server located remotely from the building, and a review server. The monitoring device measures an aggregate current supplied to components of the HVAC system and transmits current data based on the measured aggregate current. The monitoring server receives the transmitted current data and, based on the received current data, assesses whether failures have occurred in first and second components of the HVAC components. The monitoring server generates a first advisory in response to determining that the failure has occurred in the first component. The review server provides the first advisory to a technician for review and, in response to the technician verifying that the failure has occurred, transmits a first alert.

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Hvac system remote monitoring and diagnosis

A new sensorless field-oriented control of direct-drive permanent-magnet synchronous motors based on ldquosliding moderdquo has been studied and applied to domestic washing machine drives. To achieve speed control requirements for the application, a novel sliding-mode observer has been developed by applying the technique of feedback of the ldquoequivalent control.rdquo Armed with the developed algorithms, this observer is able to minimize the estimation error of rotor position at low speeds and guarantee fast convergence of the observer at high speeds in the flux-weakening region. As such, this sensorless control is suitable for domestic washing machine drives demanding wide-speed-range operation. The proposed sensorless control algorithms are implemented in a cost-effective digital controller and tested in a selected prototype washing machine. Both computer simulation and experimental results are illustrated for verification.

Sliding-Mode Sensorless Control of Direct-Drive PM Synchronous Motors for Washing Machine Applications

A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a residence includes a monitoring device installed at the residence and a server located remotely from the residence. The monitoring device measures an aggregate current supplied to a plurality of components of the HVAC system and transmits current data based on the measured aggregate current. The server receives the transmitted current data and, based on the received current, assesses whether a failure has occurred in a first component of the plurality of components of the HVAC system and assesses whether a failure has occurred in a second component of the plurality of components of the HVAC system.

Residential solutions hvac monitoring and diagnosis

A portable system for subatmospheric pressure therapy in connection with healing a surgical wound, includes a wound dressing dimensioned for positioning relative to a wound bed of a subject, a portable subatmospheric pressure mechanism dimensioned to be carried or worn by the subject and a container for collecting exudates from the wound bed removed under the subatmospheric pressure supplied by the subatmospheric pressure mechanism. The portable subatmospheric pressure mechanism includes a housing, a subatmospheric pressure source disposed within the housing and in fluid communication with the wound dressing to supply subatmospheric pressure to the wound dressing and a power source mounted to or within the housing for supplying power to actuate the subatmospheric pressure source.

Portable wound therapy system

A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor. In one embodiment, the sensors include one or more of a condenser air temperature input sensor, a condenser air temperature output sensor, and a condenser air flow sensor, an evaporator air humidity sensor. In one embodiment, the sensors include one or more of an ambient air sensor and an ambient humidity sensor.

Air filter monitoring system

A linear compressor control apparatus including a position detecting unit to detect the position of a piston and a compensation unit to compensate for output distortion of the position sensor The compensation unit compensates for output distortion of the position sensor, caused by internal temperature of the linear compressor and load variation Further, the compensation unit separates a high frequency signal and a DC signal from the output of the position detecting unit, and simultaneously performs position and temperature detecting operations using the separated high frequency signal and the DC signal

Apparatus and method of controlling linear compressor

A bumpless position/speed estimation method which uses only a low-resolution position sensor is presented for low cost permanent magnet machine (PMSM) drives. By integrating methods, i.e. using a speed reference for zero speed startup, a low resolution Hall sensor for low speed acceleration, and back-EMF for high speed operation, the rotor position can be estimated and controlled over the entire speed range. In order to achieve bumpless transitions, the three techniques are combined with a crossover function based on the speed reference. The proposed method can be used in applications with unpredictable variation in loads, such as horizontal drum washing machines.

Using low resolution position sensors in bumpless position/speed estimation methods for low cost PMSM drives

A cover for an electronic device with a stand function is provided. The cover is detachable from the electronic device. The cover includes a frame that is detachably coupled to the electronic device at least one of a side surface and a rear surface of the electronic device, a cover member that is rotatably connected to one side of the frame and bendable on at least one bending line included therein, and a protrusion portion that protrudes from the frame, wherein the cover member supports the electronic device at an incline, when the cover member is bent along the at least one bending line and the protrusion portion rests on an edge of the cover member.

Cover for electronic device

Closed-form expressions of radiated emissions from power distribution networks (PDNs) in packages are derived based on the equivalent lumped-circuit model. The expressions are validated with results from full-wave numerical computations and far-field measurements. The effects of the small planar PDN structures on radiated emissions are quantitatively investigated based on the sensitivity analysis. Using the closed-form expressions, a systematic procedure for developing quantified PDN design guidelines to suppress the radiated emissions is formulated, which is then demonstrated with a test prototype PDN. The method allows the electromagnetic compatibility aware PDN design in the initial design stage.

Quantified Design Guides for the Reduction of Radiated Emissions in Package-Level Power Distribution Networks

A protective cover of a mobile terminal is provided. The protective cover for supporting a mobile terminal in a dual direction and a multi angle includes: the protective cover for housing the mobile terminal at the inside; and a support sheet mounted in a recess formed at an outer surface of the protective cover and spread based on a groove line formed in a lattice and having a portion close contacting with the protective cover and having the remaining portions spread from the protection cover and contacting with the ground and for supporting the mobile terminal. Thereby, by supporting the mobile terminal in various heights and angles using an auxiliary card, the mobile terminal can be supported in a multi direction and a multi angle.

Namsu Kim

Papers

Apparatus and method of controlling linear compressor

Using low resolution position sensors in bumpless position/speed estimation methods for low cost PMSM drives

Cover for electronic device

Quantified Design Guides for the Reduction of Radiated Emissions in Package-Level Power Distribution Networks

Protective cover for supporting mobile terminal in dual direction and multi angle