摘要:
LED packages are disclosed that are compact and efficiently emit light, and can comprise encapsulants with curved and planar surfaces. The packages can comprise a submount with a one or a plurality of LEDs, and in those with a plurality of LEDs each of the LEDs can emit the same or different wavelengths of light than the others. A blanket conversion material layer can be included on at least some of the LEDs and the submount. The encapsulant can be on the submount, over at least some of the LEDs, with each of the planar surfaces being vertical and aligned with one of the edges of the submount. The encapsulant can also have a upper curved surface with a relatively large radius of curvature, with the combination of curved and planar surfaces resulting in efficient emission of light with a relatively narrow emission profile.
摘要:
A microwave integrated circuit includes a substrate and a power amplifier on the substrate. The power amplifier includes a power divider circuit having an input configured to receive an input RF signal, a base amplifier having an input coupled to a first output of the power divider circuit and a peaking amplifier having an input coupled to a second output of the power divider circuit and an output coupled to an output combining node. The power amplifier further includes an impedance inverter circuit coupling the output of the base amplifier to the output combining node and a load matching circuit having an input coupled to the output combining node and an output configured to be coupled to a load.
摘要:
A lighting fixture (10) for mounting onto or into a structure (12) facing an illumination area (14). The fixture (10) includes a support member (20) configured for mounting into the structure (12) and including a front end-portion (22) having an edge (24) defining a light opening (16) and a back end-portion (26) recessed from the opening (16). The support member (20) and opening (16) have a centerline (28). A mounting board (18) is disposed at the back end-portion (26) and defines with the support member (20) an open space (30) extending to the opening (16). An LED arrangement (40) includes (a) LED emitter(s) (42) on the mounting board (18) for directing light (46) toward the opening (16), each emitter (42) defining an emitter axis (44), and (b) a lens (50A) for each emitter (42) at least one of which is off-centerline in a first lateral direction (32). The lens (50A) is configured for distribution of emitter light in off-axial direction across the open space (30) and passing through the opening (16) at an edge portion (25) that is off-centerline in the opposite lateral direction (33), thereby to widen the illumination angle (48) from the fixture (10) while having no more than minimal light directed onto the support member (20).
摘要:
A method of forming a transistor device includes providing a drift layer having a first conductivity type and an upper surface, forming first regions in the drift layer and adjacent the upper surface, the first regions having a second conductivity type that is opposite the first conductivity type and being spaced apart from one another, forming a body layer on the drift layer including the source regions, forming spaced apart source regions in the body layer above respective ones of the first regions, forming a vertical conduction region in the body layer between the source regions, the vertical conduction region having the first conductivity type and defining channel regions in the body layer between the vertical conduction region and respective ones of the source regions, forming a gate insulator on the body layer, and forming a gate contact on the gate insulator.
摘要:
An LED light fixture (10) includes a heat-sink (12), a circuit board (14) thereon and having a plurality of spaced LED light sources (14A), and a one-piece optical member (16) with a plurality of secondary lenses (20) over corresponding LED light sources, the one-piece optical member comprises (a) each of the lenses having at least one layer of a polymeric material which extends into a lens flange (24) of such material that surrounds the lens and is spaced from the other lenses and (b) a polymeric carrier portion (26) surrounding the lenses, overlapping and molded onto the lens flanges (24) across such overlapping.
摘要:
An LED floodlight fixture including a housing that forms a substantially water/air-tight chamber, electronic LED driver(s) within the chamber, and an LED assembly secured with respect to the housing adjacent thereto in non-water/air-tight condition, the LED assembly having at least one LED-array module mounted on an LED heat sink. In certain preferred embodiments the housing is a perimetrical structure such that the substantially water-tight chamber substantially surrounds the LED assembly.
摘要:
A lighting apparatus includes a solid-state lighting circuit, a ballast connection port including first and second terminals and a filament-imitating impedance coupled between the first and a second terminals of the ballast connection port and to an input terminal of the solid-state lighting circuit. The filament-imitating impedance may be configured to transfer power at a nominal frequency of an output produced by the ballast and to provide an impedance between the first and second terminals of the ballast connection port that prevents shutdown of the ballast. In some embodiments, the filament-imitating impedance may vary with temperature, e.g., the filament-imitating impedance may be configured to imitate a temperature dependence of a fluorescent tube filament. The lighting apparatus may be included in a fluorescent lamp replacement lamp.