Abstract:
A method for providing pre-placed, pre-brazed feed throughs in the substrate (4) of a hermetic package corresponding to the terminal leads (6b) of the encased circuit COTS components (6). The substrate (4) may include directly bonded copper (DBC) regions forming circular shapes (10) where the holes for the special connectors of the present invention will be located. These holes will correspond to the leads of the circuit component (6) that will be mounted to it. Holes are laser or mechanically drilled into the substrate (4) inside the circular shapes (10) formed in the DBC. To form the feed through, a bushing (12), such as a blind copper rivet, is brazed in the hole, with the open end thereof oriented toward the component-side of the substrate. These open ends can accept the leads of the circuit component (6), like the holes of a conventional PC circuit board.
Abstract:
A device, a system, and a method for preventing power- producing wind turbine generators(22) from tripping due to the detection of a low-voltage condition on a power grid (27) are disclosed.The disclosed device includes a resistor bank(35c) that absorbs real power and a control system that maintains the collector bus voltage (26) above a threshold voltage level during the duration of low-voltage condition on the power grid. Collector bus voltage (26) is maintained using gating signals that include phase delay angles to adjust the opening/closing of the switching devices.
Abstract:
An integrated bearing system (10) for supporting a rotatable shaft journal (58). The system (10) comprises a foil bearing (40) in combination with a magnetic field generating device (50) that produces a magnetic bearing capability to the rotatable shaft journal (58). The foil bearing (40) is integrated into the magnetic field generating device (50), leaving an air gap between the shaft journal (58) and the foil bearing (10). Under normal operating conditions, the magnetic field generating device (50) and the foil bearing (10) each provide a portion of the support to the shaft journal (58).
Abstract:
An electronic semiconductor package is described. The package has a wide band gap electronic semiconductor device requiring heat removal. On one side of the electronic semiconductor device is a first, thermally-conductive, electrically- insulative substrate having a predetermined electrically-conductive wire pattern affixed thereto. On the other side of the electronic semiconductor device is a second, thermally- conductive, electrically-insulative substrate. A heat removal device is mechanically-coupled to the second substrate. The heat removal device is made of a graphite-metal or metal-matrix composite material and a fin array structure of the same material. The coefficients of thermal expansion of the heat removal device and the first and second substrates are matched to minimize internal and external stresses.
Abstract:
Heat exchange devices (1) and methods of using and making them are disclosed. The heat exchange devices (1) have an elongate core (2) with a helical member (3) coiling along the outer surface of the core and extending along the longitudinal axis of the core. The heat exchange devices can be used alone or in groups, wherein a plurality of heat exchange devices can be connected independently to a substrate (10) and be disconnected from adjacent heat exchange devices. Fluids can be forced between the heat exchange devices to facilitate heat transfer.
Abstract:
An electronic semiconductor package is described. The package has a wide band gap electronic semiconductor device requiring heat removal. On one side of the electronic semiconductor device is a first, thermally-conductive, electrically- insulative substrate having a predetermined electrically-conductive wire pattern affixed thereto. On the other side of the electronic semiconductor device is a second, thermally- conductive, electrically-insulative substrate. A heat removal device is mechanically-coupled to the second substrate. The heat removal device is made of a graphite-metal or metal-matrix composite material and a fin array structure of the same material. The coefficients of thermal expansion of the heat removal device and the first and second substrates are matched to minimize internal and external stresses.
Abstract:
A system and method for providing constant -frequency electrical power from variable- speed mechanical power are disclosed. The system includes a wound- rotor induction machine generator (WRIMG), a first power converter, e.g., an inverter or a bridge rectifier, that provides power from the stator assembly of the WRIMG to the load, and a second power converter, e.g., an inverter or a bridge rectifier, that provides power from the rotor assembly of the WRIMG to the load. A controller controls the output stator- current based on comparisons between measured DC load bus data and a reference DC load bus voltage value, measured machine shaft angular position and reference rotor frequency data, and measured stator- current data that is fed-back to the stator -current controller by the power converter device (s) .
Abstract:
A low-voltage, low-inductance device for storing electrical charge in a snubber circuit is disclosed as well as a method of minimizing inductance in the snubber circuit using the device. The device, a capacitor (10), comprises a plurality of extended electrodes, in parallel or series, that are joined to a positive conductor terminal at one end spray and at a negative conductor terminal at the other end spray so that end sprays of adjacent extended electrodes are alternately joined to the positive and negative conductor terminals. Accordingly, current flowing though adjacent extended electrodes is of substantially equal intensity but different in direction. As a result, inductance produced effectively cancels out that of adjacent extended electrodes. The method includes sandwiching an insulating film (21) between the positive and negative conductor terminals and alternately joining the conductor terminals to the end sprays of extended electrodes so that current flows in opposite directions between end sprays (22a, 22b) of adjacent extended electrodes, thereby canceling out inductance.
Abstract:
Uninterruptible power supply system (200) uses a slip-ring induction machine (10) and a flywheel combination. The UPS system (200) comprises a back-up power source connected in parallel to a primary power source such as utility grid. During normal operation of the UPS system (200), the primary power source (130) supplies power to the load and the UPS compensates for voltage drop. Moreover, the primary power source keeps the slip-ring induction machine and the flywheel in an excited state above normal synchronous speed. When the primary power source fails, the flywheel, which is rotating at super-synchronous speed and storing kinetic energy, drives the rotor of the slip-ring induction machine to generate power. Accordingly, the slip-ring induction machine and flywheel combination provides instantaneous, short term power to the load until the back-up power source has powered up and been brought online.
Abstract:
The heat exchange system for conducting heat away heat-producing electronic components (22) comprising a metal tube (10) defining a flow channel for a cooling fluid, wherein the tube (10) has an inner surface (17) that comprise s a plurality of integral fins (12), and an outer surface (11, 13, 15) that is in direct contact with the heat producing components (22). The invention further provides a self-cooling, self-supporting electronic assembly that comprises one or more high-power electronic devices (22), the heat exchange system (10) and an attaching system (23, 25, 46) for attaching high-power electronic devices (22) to the heat exchange system (10). The invention further provides a method of cooling a heat producing means.