Patent application number | Description | Published |
20150021742 | Methods of Forming Junction Termination Extension Edge Terminations for High Power Semiconductor Devices and Related Semiconductor Devices - Methods of forming a power semiconductor device having an edge termination are provided in which the power semiconductor device that has a drift region of a first conductivity type is formed on a substrate. A junction termination extension is formed on the substrate adjacent the power semiconductor device, the junction termination extension including a plurality of junction termination zones that are doped with dopants having a second conductivity type. The junction termination zones have different effective doping concentrations. A dopant activation process is performed to activate at least some of the dopants in the junction termination zones. An electrical characteristic of the power semiconductor device is measured. Then, the junction termination extension is etched in order to reduce the effective doping concentration within the junction termination extension. | 01-22-2015 |
20150048489 | EDGE TERMINATION TECHNIQUE FOR HIGH VOLTAGE POWER DEVICES - Embodiments of a semiconductor die having a semiconductor device implemented on the semiconductor die and an edge termination structure around a periphery of the semiconductor device and methods of fabricating the same are disclosed. In one embodiment, a semiconductor die includes a semiconductor device and an edge termination structure around a periphery of the semiconductor device, where the edge termination structure includes negative features (e.g., trenches and/or divots) that vary dose in a corresponding edge termination region to approximate a desired dose profile. In one embodiment, the desired dose profile is a substantially decreasing or substantially linearly decreasing dose from an edge of a main junction of the semiconductor device to an edge of the edge termination region. In this manner, electric field crowding at the edge of the main junction of the semiconductor device is substantially reduced, which in turn substantially improves a break-down voltage of the semiconductor device. | 02-19-2015 |
20150084062 | MONOLITHICALLY INTEGRATED VERTICAL POWER TRANSISTOR AND BYPASS DIODE - A vertical field-effect transistor (FET) device includes a monolithically integrated bypass diode connected between a source contact and a drain contact of the vertical FET device. According to one embodiment, the vertical FET device includes a pair of junction implants separated by a junction field-effect transistor (JFET) region. At least one of the junction implants of the vertical FET device includes a deep well region that is shared with the integrated bypass diode, such that the shared deep well region functions as both a source junction in the vertical FET device and a junction barrier region in the integrated bypass diode. The vertical FET device and the integrated bypass diode may include a substrate, a drift layer over the substrate, and a spreading layer over the drift layer, such that the junction implants of the vertical FET device are formed in the spreading layer. | 03-26-2015 |
20150084063 | SEMICONDUCTOR DEVICE WITH A CURRENT SPREADING LAYER - A semiconductor device includes a substrate, a drift layer over the substrate, a spreading layer over the drift layer, and a pair of junction implants in a surface of the spreading layer opposite the drift layer. An anode covers the surface of the spreading layer opposite the drift layer, and a cathode covers a surface of the substrate opposite the drift layer. By including the spreading layer, a better balance can be struck between the on state resistance of the semiconductor device and the peak electric field in the device, thereby improving the performance thereof. | 03-26-2015 |
20150084118 | SEMICONDUCTOR DEVICE INCLUDING A POWER TRANSISTOR DEVICE AND BYPASS DIODE - A semiconductor device includes a vertical FET device and a Schottky bypass diode. The vertical FET device includes a gate contact, a source contact, and a drain contact. The gate contact and the source contact are separated from the drain contact by at least a drift layer. The Schottky bypass diode is coupled between the source contact and the drain contact and monolithically integrated adjacent to the vertical FET device such that a voltage placed between the source contact and the drain contact is distributed throughout the drift layer by the Schottky bypass diode in such a way that a voltage across each one of a plurality of P-N junctions formed between the source contact and the drain contact within the vertical FET device is prevented from exceeding a barrier voltage of the respective P-N junction. | 03-26-2015 |
20150084119 | LAYOUT CONFIGURATIONS FOR INTEGRATING SCHOTTKY CONTACTS INTO A POWER TRANSISTOR DEVICE - A semiconductor device includes a vertical field-effect-transistor (FET) and a bypass diode. The vertical FET device includes a substrate, a drift layer formed over the substrate, a gate contact and a plurality of source contacts located on a first surface of the drift layer opposite the substrate, a drain contact located on a surface of the substrate opposite the drift layer, and a plurality of junction implants, each of the plurality of junction implants laterally separated from one another on the surface of the drift layer opposite the substrate and extending downward toward the substrate. Each of the one or more bypass diodes are formed by placing a Schottky metal contact on the first surface of the drift layer, such that each Schottky metal contact runs between two of the plurality of junction implants. | 03-26-2015 |
20150084125 | MONOLITHICALLY INTEGRATED VERTICAL POWER TRANSISTOR AND BYPASS DIODE - A vertical field-effect transistor (FET) device includes a monolithically integrated bypass diode connected between a source contact and a drain contact of the vertical FET device. According to one embodiment, the vertical FET device includes a pair of junction implants separated by a junction field-effect transistor (JFET) region. At least one of the junction implants of the vertical FET device includes a deep well region that is shared with the integrated bypass diode, such that the shared deep well region functions as both a source junction in the vertical FET device and a junction barrier region in the integrated bypass diode. The vertical FET device and the integrated bypass diode may include a substrate, a drift layer over the substrate, and a spreading layer over the drift layer, such that the junction implants of the vertical FET device are formed in the spreading layer. | 03-26-2015 |
20150102361 | SEMICONDUCTOR DEVICES IN SIC USING VIAS THROUGH N-TYPE SUBSTRATE FOR BACKSIDE CONTACT TO P-TYPE LAYER - A Silicon Carbide (SiC) semiconductor device having back-side contacts to a P-type region and methods of fabrication thereof are disclosed. In one embodiment, an SiC semiconductor device includes an N-type substrate and an epitaxial structure on a front-side of the N-type substrate. The epitaxial substrate includes a P-type layer adjacent to the N-type substrate and one or more additional SiC layers on the P-type layer opposite the N-type substrate. The semiconductor device also includes one or more openings through the N-type substrate that extend from a back-side of the N-type substrate to the P-type layer and a back-side contact on the back-side of the N-type substrate and within the one or more openings such that the back-side contact is in physical and electrical contact with the P-type layer. The semiconductor device further includes front-side contacts on the epitaxial structure opposite the N-type substrate. | 04-16-2015 |
Patent application number | Description | Published |
20100016770 | HIGH FREQUENCY CHEST WALL OSCILLATION SYSTEM - An air pulse generator for providing high frequency chest wall oscillation therapy to a patient is provided. The air pulse generator has a housing and first and second diaphragms supported in the housing. The air pulse generator further has a crankshaft assembly coupled to the first and second diaphragms to reciprocally move the diaphragms back and forth to produce oscillating pressure pulses. The crank shaft assembly includes a motor with an output shaft that rotates about a first axis, a flywheel mounted on the shaft to rotate therewith, a first member coupled to the first diaphragm and pinned to the flywheel by a first stub shaft that is offset from the first axis, a second member coupled to the second diaphragm, and a cam interposed between the first member and the second member. The first member is pinned to the cam by the first stub shaft and the second member is pinned to the cam by a second stub shaft. | 01-21-2010 |
20110017063 | APPARATUS FOR SEPARATING OXYGEN FROM AMBIENT AIR - An apparatus for separation of gases from ambient air that has at least one separation column with an inlet at a first end and an outlet at a second end, a buffer column having a single inlet at a first end, a vacuum pump, and a valve system that connects the vacuum pump to the outlet at the first end of the separation column, and that connects the outlet at the second end of separation column to the single inlet at the first end of the buffer column. | 01-27-2011 |
20110017216 | METHOD OF SEPARATING AND DISTRIBUTING OXYGEN - Disclosed is a method of providing oxygen rich gas. Oxygen is separated from ambient air with an oxygen separator in discrete pulses, one pulse at a time. The start of the pulse is synchronized with the beginning of an inhalation of a person. The oxygen rich gas in each pulse is separated from the ambient air in real time during a nitrogen adsorption step concurrent with each inhalation. | 01-27-2011 |
20110020143 | METHOD OF CONTROLLING GASEOUS FLUID PUMP - A method of controlling a fluid pump. The pump has a plurality of oscillating pistons that travel along a central axis of a piston sleeve. A plurality of pistons is of similar mass within a piston sleeve are provided, and adjacent pistons are positioned to be 180 degrees apart in phase oscillations. An electric coil is provided for each piston, and the position of adjacent pistons is determined. The current to one of the electric coils for a piston is adjusted to maintain the 180 degree difference in phase between oscillations of adjacent pistons. | 01-27-2011 |
20110020156 | GASEOUS FLUID PUMP - A gaseous fluid pump having at least one cylinder having a wall defining an inner volume and containing a central axis. First and second pistons that both move along the central axis, wherein the first piston and second piston have similar mass. The first and second pistons are propelled by magnetic forces in an oscillating motion with a 180 degree phase difference between the first and second pistons. | 01-27-2011 |
20110197890 | AMBULATORY OXYGEN CONCENTRATOR - An oxygen concentrator provides ambulatory oxygen utilizing a vacuum swing adsorption (VSA) oxygen separator powered by a power pack. The separator has a plurality of nitrogen-selective adsorbent beds, each operating in VSA cycles including feed, evacuation and repressurization phases. The concentrator also contains a delivery system for receiving oxygen produced by the VSA separator. | 08-18-2011 |
20120016282 | HIGH FREQUENCY CHEST WALL OSCILLATION SYSTEM - A high frequency chest wall oscillation (HFCWO) therapy system includes an inflatable garment, an air pulse generator operable to produce oscillating pressure pulses that are communicated to the inflatable garment, at least one hose to interconnect the air pulse generator with the inflatable garment and to communicate the oscillatory pressure pulses from the air pulse generator to the inflatable garment. The air pulse generator is sized, shaped, and configured so as to occupy a volume no greater than about 1,200 in. | 01-19-2012 |
20130036910 | APPARATUS FOR SEPARATING OXYGEN FROM AMBIENT AIR - An apparatus for separation of gases from ambient air that has at least one separation column with an inlet at a first end and an outlet at a second end, a buffer column having a single inlet at a first end, a vacuum pump, and a valve system that connects the vacuum pump to the outlet at the first end of the separation column, and that connects the outlet at the second end of separation column to the single inlet at the first end of the buffer column. | 02-14-2013 |
20130145933 | APPARATUS FOR SEPARATING OXYGEN FROM AMBIENT AIR - An apparatus for separation of gases from ambient air that has at least one separation column containing an adsorbent with an inlet at a first end and an outlet at a second end, a buffer column containing an adsorbent and having a single inlet at a first end, a vacuum pump, and a valve system that connects the vacuum pump to the outlet at the first end of the separation column, and that connects the outlet at the second end of the separation column to the single inlet at the first end of the buffer column. | 06-13-2013 |
20130186276 | AMBULATORY OXYGEN CONCENTRATOR - An oxygen concentrator provides ambulatory oxygen utilizing a vacuum swing adsorption (VSA) oxygen separator powered by a power pack. The separator has a plurality of nitrogen-selective adsorbent beds, each operating in VSA cycles including feed, evacuation and repressurization phases. The concentrator also contains a delivery system for receiving oxygen produced by the VSA separator. | 07-25-2013 |
20130267877 | HIGH FREQUENCY CHEST WALL OSCILLATION APPARATUS - A high frequency chest wall oscillation (HFCWO) apparatus for the purpose of lung airway clearance of people includes an inflated vest type garment worn around the chest of a person. An oscillating pressure generator with reduced power requirements and a power source is integrated with the garment so that the complete apparatus is wearable by the person. Improvements in pressure waveforms, safety and compliance to prescribed use are disclosed. | 10-10-2013 |
20140053728 | APPARATUS FOR SEPARATING OXYGEN FROM AMBIENT AIR - An apparatus for separation of gases from ambient air that has at least one separation column with an inlet at a first end and an outlet at a second end, a buffer column having a single inlet at a first end, a vacuum pump, and a valve system that connects the vacuum pump to the outlet at the first end of the separation column, and that connects the outlet at the second end of separation column to the single inlet at the first end of the buffer column. | 02-27-2014 |
20140166003 | METHOD OF SEPARATING AND DISTRIBUTING OXYGEN - Disclosed is a method of providing oxygen rich gas. Oxygen is separated from ambient air with an oxygen separator in discrete pulses, one pulse at a time. The start of the pulse is synchronized with the beginning of an inhalation of a person. The oxygen rich gas in each pulse is separated from the ambient air in real time during a nitrogen adsorption step concurrent with each inhalation. | 06-19-2014 |
20140174436 | REMOVABLE CARTRIDGE FOR OXYGEN CONCENTRATOR - A removable gas separation cartridge includes a housing having an inlet port, an outlet port, and a bed of adsorbent material. The cartridge is removable from an oxygen concentrator which separates oxygen from ambient air by using an absorption process. | 06-26-2014 |