Abstract: A multi-chip interconnection package structure with a heat dissipation plate and a preparation method thereof are provided. The multi-chip interconnection package structure with a heat dissipation plate includes a fine circuit layer, at least one die, a heat dissipation plate, a plastic package body, and a package circuit layer, the heat dissipation plate is provided on the fine circuit layer, and is mounted on a side of the die away from the fine circuit layer, the plastic package body wraps the die and the heat dissipation plate, and the package circuit layer is provided on the plastic package body.

Abstract: The present disclosure provides a frequency converter. The frequency converter includes a box body and a bottom box. A bottom portion of the box body is fixedly connected with a top portion of the bottom box. A top portion of a left side of the box body and a bottom portion of the left side of the box body are fixedly connected to a respective fan. A top portion of a left side of an inner wall of the box body and a top portion of the left side of the inner wall of the box body are fixedly connected to a respective annular plate. One end of an output shaft of each fan is fixedly connected to a rotating rod. One end of each rotating rod away from the fan passes through the box body and extends to an interior of the box body.

Abstract: A group control device includes a central processing system. An output port of the central processing system is electrically connected to an input port of a display unit through a first wire. An output port of the display unit is electrically connected to an input port of a signal feedback module through a second wire. The output port of the signal feedback module is electrically connected to an input port of the central processing system through a third wire. The input port of the central processing system is electrically connected to an input port of the group control host operating terminal. The input port of the group control host operating terminal is electrically connected to an output port of a data sending module. The central processing system is bidirectionally connected with a retrieval and extraction module through wireless connection.

Abstract: A memory device includes a memory array having a plurality of memory cells. Each of the plurality of memory cells includes a first word line to apply a first signal to select the each of the plurality of memory cells to read data from or write the data to the each of the plurality of memory cells, a second word line to apply a second signal to select the each of the plurality of memory cells to read the data from or write the data to the each of the plurality of memory cells, and a bit line to read the data from the each of the plurality of memory cells or provide the data to write to the each of the plurality of memory cells upon selecting the each of the plurality of memory cells by at least one of the first word line or the second word line.

Abstract: A group control device includes a central processing system. An output port of the central processing system is electrically connected to an input port of a display unit through a first wire. An output port of the display unit is electrically connected to an input port of a signal feedback module through a second wire. The output port of the signal feedback module is electrically connected to an input port of the central processing system through a third wire. The input port of the central processing system is electrically connected to an input port of the group control host operating terminal. The input port of the group control host operating terminal is electrically connected to an output port of a data sending module. The central processing system is bidirectionally connected with a retrieval and extraction module through wireless connection.

Abstract: The present disclosure provides a frequency converter. The frequency converter includes a box body and a bottom box. A bottom portion of the box body is fixedly connected with a top portion of the bottom box. A top portion of a left side of the box body and a bottom portion of the left side of the box body are fixedly connected to a respective fan. A top portion of a left side of an inner wall of the box body and a top portion of the left side of the inner wall of the box body are fixedly connected to a respective annular plate. One end of an output shaft of each fan is fixedly connected to a rotating rod. One end of each rotating rod away from the fan passes through the box body and extends to an interior of the box body.

Abstract: A method for calibrating a motor is provided. The method includes defining a reference speed for operating the motor; operating the motor until a first operating point at which the motor reaches the reference speed; measuring a first current of the motor and an angular acceleration associated with the first current at the first operating point; operating the motor until a second operating point at which the motor reaches the reference speed; measuring a second current of the motor at the second operating point; and estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration associated with the first current.

Abstract: A method for calibrating a motor is provided. The method includes defining a reference speed for operating the motor; operating the motor until a first operating point at which the motor reaches the reference speed; measuring a first current of the motor and an angular acceleration associated with the first current at the first operating point; operating the motor until a second operating point at which the motor reaches the reference speed; measuring a second current of the motor at the second operating point; and estimating a calibration coefficient for calibrating the motor based at least on the first current, the second current, and the angular acceleration associated with the first current.

Abstract: Systems and methods for determining the health of a compressor are disclosed. In one embodiment, a prognostic-diagnostic unit (PDU) compares expected compressor power consumption, based on current operating conditions of the HVAC system, to actual compressor power consumption. If the actual power consumption is within a predefined range of the expected power consumption under current operational conditions, the HVAC system is determined to be operating properly. If the actual power consumption deviates from the expected power consumption, a fault is indicated. An appropriate action is taken, such as displaying a fault alert, transmitting a fault message to another device, and storing information relating to the fault for later retrieval to assist troubleshooting.

Abstract: A compressor heating system includes a compressor drive controller electrically coupled to an outdoor controller configured to selectively implement a pulse width modulation algorithm to deliver a pulsed direct current (DC) from the compressor drive controller to at least one stator winding of a motor of a variable speed compressor to provide heat to the compressor to prevent refrigerant migration to the compressor when the compressor remains idle with respect to operating in a cooling or heating mode.

Abstract: A power factor optimized variable speed drive unit for an electric motor of an HVAC device is disclosed. In an embodiment, the unit includes a selectively-activatable power factor correction unit operatively associated with a switched mode power supply unit. A power measurement unit measures the input power of the electric motor. A comparator unit compares the motor input power to a predetermined threshold. The comparator unit activates the power factor correction unit when the input power of the electric motor is above the threshold, and deactivates the power factor correction unit when the input power of the electric motor falls below the threshold. In an embodiment, motor input power is determined by the product of motor load current and motor speed.

Abstract: Detection of reverse rotation or operation of a refrigerant compressor is provided. In one aspect, a detection technique includes starting the compressor and determining the compressor is rotating in a reverse direction if a dome temperature of the compressor fails to exceed a first predetermined threshold at or before expiration of a first predetermined period of time following starting, the refrigerant pressure at a refrigerant inlet of the compressor remains constant for a second predetermined period of time following starting, and/or the frequency of pressure oscillations of the refrigerant at the refrigerant inlet exceeds a second predetermined threshold. Another technique for determining the compressor is rotating in the reverse direction involves analyzing a waveform associated with motor current, motor torque, or refrigerant pressure. Further embodiments, forms, features, and aspects shall become apparent from the description and drawings.

Abstract: A power factor optimized variable speed drive unit for an electric motor of an HVAC device is disclosed. In an embodiment, the unit includes a selectively-activatable power factor correction unit operatively associated with a switched mode power supply unit. A power measurement unit measures the input power of the electric motor. A comparator unit compares the motor input power to a predetermined threshold. The comparator unit activates the power factor correction unit when the input power of the electric motor is above the threshold, and deactivates the power factor correction unit when the input power of the electric motor falls below the threshold. In an embodiment, motor input power is determined by the product of motor load current and motor speed.

Abstract: Systems and methods for determining the health of a compressor are disclosed. In one embodiment, a prognostic-diagnostic unit (PDU) compares expected compressor power consumption, based on current operating conditions of the HVAC system, to actual compressor power consumption. If the actual power consumption is within a predefined range of the expected power consumption under current operational conditions, the HVAC system is determined to be operating properly. If the actual power consumption deviates from the expected power consumption, a fault is indicated. An appropriate action is taken, such as displaying a fault alert, transmitting a fault message to another device, and storing information relating to the fault for later retrieval to assist troubleshooting.

Abstract: One embodiment is a diagnostic method for a system including setting a first diagnostic code based upon a condition of a DC bus of a variable frequency drive during a first drive state, setting at least one additional diagnostic code based upon a condition of at least one motor phase current during a second drive state, outputting first diagnostic information indicating a malfunction of the variable frequency drive if the first diagnostic code indicates a first error, and outputting second diagnostic information indicating a malfunction of a motor or a connector coupling the motor and the drive if the at least one additional diagnostic code indicates a second error.

Abstract: A compressor heating system may include a compressor drive controller electrically coupled to an outdoor controller configured to selectively implement a pulse width modulation algorithm to deliver a pulsed DC current from the compressor drive controller to at least one stator winding of a motor of a variable speed compressor to provide more efficient auxiliary heating to the compressor to prevent refrigerant migration to the compressor when the compressor remains idle with respect to operating in a cooling or heating mode. The compressor heating system may consume less off-cycle power than traditional compressor auxiliary heating systems, thus complying with regulatory requirements where off-cycle power must average below specific thresholds.

Abstract: One embodiment is a diagnostic method for a system including setting a first diagnostic code based upon a condition of a DC bus of a variable frequency drive during a first drive state, setting at least one additional diagnostic code based upon a condition of at least one motor phase current during a second drive state, outputting first diagnostic information indicating a malfunction of the variable frequency drive if the first diagnostic code indicates a first error, and outputting second diagnostic information indicating a malfunction of a motor or a connector coupling the motor and the drive if the at least one additional diagnostic code indicates a second error.

Abstract: Detection of reverse rotation or operation of a refrigerant compressor is provided. In one aspect, a detection technique includes starting the compressor and determining the compressor is rotating in a reverse direction if a dome temperature of the compressor fails to exceed a first predetermined threshold at or before expiration of a first predetermined period of time following starting, the refrigerant pressure at a refrigerant inlet of the compressor remains constant for a second predetermined period of time following starting, and/or the frequency of pressure oscillations of the refrigerant at the refrigerant inlet exceeds a second predetermined threshold. Another technique for determining the compressor is rotating in the reverse direction involves analyzing a waveform associated with motor current, motor torque, or refrigerant pressure. Further embodiments, forms, features, and aspects shall become apparent from the description and drawings.

Abstract: A complete virus-mediated system for recombinant AAV production including: (a) a first recombinant adenovirus encoding one or more AAV REP78/68 polypeptides and one or more viral capsid polypeptides; (b) a second recombinant adenovirus encoding a gene of interest and including AAV inverted terminal repeats, wherein the AAV inverted terminal repeats flank the gene of interest; (c) viral helper functions; and (d) a host cell transduced with the first recombinant adenovirus, the second recombinant adenovirus, and the viral helper functions.