Abstract:
An overmolded electronic assembly 20 having an electromagnetic interference shield 50, in the form of a thin metal film or foil, coupled to the top of or within an overmolded body 33. The shield 50 effectively reduces the amount of electromagnetic interference ("EMI") emissions from penetrating within the assembly to the circuit board 22 without substantially increasing the cost of the unit. Thus, an electronic assembly having improved vibration, moisture, and EMI emission resistance is achieved as compared with traditional overmolded or metal assemblies. Further, because the shield 50 can be formed on the electronic assembly in one continuous processing step, a substantial savings in time and cost for the manufacturing process is also realized.
Abstract:
A process and electronic assembly (10) for conducting heat from a semiconductor circuit device (12) mounted to a substrate (14). The substrate (14) is supported by a housing member (20) equipped with a heat-conductive member (26). A surface (28) of the device (12) opposite the substrate (14) is bonded to the heat-conductive member (26) with a solder joint (30) formed of indium and optionally one or more alloying constituents that increase the melting temperature of the solder joint (30) above that of indium. The housing member (20), substrate (14), and device (12) are assembled so that an indium-containing solder material is present between the heat-conductive member (26) and the surface (28) of the device (12) opposite the substrate (14). The solder material is then reflowed to form the solder joint (30). The alloying constituent(s) are preferably introduced into the solder joint (30) during reflow.
Abstract:
A power semiconductor device package utilizes integral fluid conducting micro-channels (14), one or more inlet ports (38) for supplying liquid coolant to the micro-channels (14), and one or more outlet ports (40) for exhausting coolant that has passed through the micro-channels (14). The semiconductor device (10) is mounted on a single or multi-layer circuit board (44) having electrical and fluid interconnect features that mate with the electrical terminals (12a, 12b) and inlet and outlet ports (38, 40) of the device (10) to define a self-contained and self-sealed micro-channel heat exchanger.
Abstract:
An electricity generating heat exchanger (18) for a vehicle (12) equipped with an exhaust gas (16) carbon dioxide (CO2) separator, said heat exchanger (18) comprising: an exhaust gas chamber (50) configured to guide engine (14) exhaust through the heat exchanger (18); an absorber fluid chamber (52) configured to guide CO2 absorbent fluid (24) through the heat exchanger (18); and a first thermal electric generator (TEG (54)) configured to couple thermally the exhaust gas chamber (50) to the absorber fluid chamber (52) in a manner effective to heat the CO2 absorbent fluid (24) by heat from the engine (14) exhaust to release CO2 gas from the CO2 absorbent fluid (24) and generate electricity in response to a temperature difference therebetween.
Abstract:
A transparent bevel apparatus (20/20') overlays marginal portions of juxtaposed display devices (12, 14) of a segmented display panel (10) to obscure the visual gap (G) between the display devices (12, 14). The bevel apparatus (20/20') at least partially overlaps only marginal pixels of the adjacent display devices (12, 14), so that light from a given display device (12, 14) that passes through the bevel apparatus (20/20') is bent toward the respective display device (12, 14) at an angle with respect to the remainder of the emitted light. Consequently, light emitted from the marginal portions of the juxtaposed display devices (12, 14) is seen by the viewer in the place where the visual gap (G) would otherwise be seen. The bevel apparatus may be constructed in the form of a sheet (20') that overlays an entire display device (12, 14), or all or a portion of the entire display panel (10), or a narrow strip (20) that is aligned with the seams (18) and affixed to juxtaposed faces (22, 24) of the display devices (12, 14).
Abstract:
An electronic package having circulated submersed cooling fluid and method are provided. The electronic package has a housing defining a sealed enclosure and electronic devices located in the housing. The electronic devices have thermal emitting electrical circuitry. A dielectric fluid, such as a liquid, is located in the housing in heat transfer relationship with the electronic devices. A fluid circulator, such as a piezo fan, is located in the housing in contact with the dielectric liquid for circulating the dielectric liquid to cool the electronic devices.
Abstract:
A chip cooling system 10 including a semiconductor device 12 having a bulk region 14, wherein at least one fluid channel 16 extends at least partially through the bulk region 14, the fluid channel 16 having an inlet 18 and an outlet 20, a fluid inlet port 36 in fluid communication with the channel inlet 18, and a fluid outlet port 38 in fluid communication with the channel outlet 20, and a cooling fluid flows from the fluid inlet port 36, through the fluid channel 16 and to the fluid outlet port 38 to cool the bulk region 14.
Abstract:
A circuit board assembly (10) comprising a laminate substrate (12) and a surface mount device (18) having a CTE less than that of the laminate substrate (12) and attached with at least one solder joint (20) to a first surface (14) of the laminate substrate (12). The assembly (10) further includes a localized stiffener (24,124,224) attached to a second surface (16) of the laminate substrate (12) so as to be directly opposite the circuit device (18). The localized stiffener (24,124,224) is formed of a material and is shaped so that, when attached to the laminate substrate (12), the stiffener (24,124,224) is capable of increasing the thermal cycle fatigue life of the one or more solder joints (20) that attach the device (18) to the substrate (12).
Abstract:
An electronic package (10) having a controlled standoff height between a surface mount device (16) and a circuit board (12). The electronic package (10) includes a circuit board (12) having a substrate and circuitry including mounting pads (14) and a surface mount device (16) having circuitry and contact terminals (18). Solder joints (20) connect the contact terminals (18) of the surface mount device (16) to the mounting pads (14) on the circuit board (12). A dielectric underfill (22) is disposed between the circuit board (12) and the surface mount device (16), and a plurality of filler particles (24) are disposed in the underfill material (22) to provide a separation distance between the circuit board (12) and the surface mount device (16).