1. A multi flip chip module comprising:
a leadframe having a die pad with upper and lower surfaces and a plurality of outer leads surrounding the die pad;
an integrated circuit mounted on the upper surface of the die pad and having contact areas for receiving bond wires;
bond wires extending from the contact areas on the integrated circuit to the outer leads of the leadframe;
one or more power mosfet semiconductor devices flip chip mounted on the lower surface of the leadframe; and
a molded resin encapsulating the integrated circuit and leaving exposed at least one surface of the power mosfet semiconductor devices.
2. The multichip module of claim 1 wherein the mosfets have source bump contacts extending from the surfaces of the mosfets to the half etched die pad and one or more gate bump contacts for each mosfet extending to a corresponding outer lead.
3. The multichip module of claim 1 wherein the lead frame has leadless contacts comprising a of ball contacts extending from the outer leads for establishing an electrical connection to the contact areas of the integrated circuit via the bond wires and for providing surface mounts for connecting the semiconductor device to a surface of an electrical component board.
4. The multichip module of claim 1 wherein exposed surface(s) of the power mosfets are surface mountable on an electrical component board.
5. A multichip module having a lead frame with a central die pad and peripheral outer leads, an integrated circuit on one side of the die pad, wire bonds for connecting the integrated circuit to outer leads, one or more mosfets having their respective source and gates bump connected to the other side of the central die pad, said central die pad patterned to provide connections to the outer leads from the source and gate bump connections.
6. The multichip module of claim 5 wherein the integrated circuit is encapsulated in an insulating resin.
7. A method for manufacturing a multichip module comprising the steps of;
providing a lead frame with a central die pad having upper and lower surfaces and disposed between opposite lead rails having outer lead areas
etching the lower surface of the central die pad and the rails to provide raised lands for receiving source and gate contacts of one or more mosfets;
attaching an integrated circuit to the upper surface of the central die pad;
wire bonding contact areas of the integrated circuit to the outer lead areas on the leadframe rails;
encapsulating the integrated circuit in an electrically insulating resin;
bump attaching the source and gate of one or more mosfets to the raised lands on the lower side of the central die pad.
8. The method of claim 9 wherein the leadframe adheres to a tape and the tape is removed after the step of encapsulating.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. In a gas turbine, a plurality of combustors, each having a plurality of outer fuel nozzles arranged about a longitudinal axis of the combustor, a center nozzle disposed substantially along said longitudinal axis, and a single combustion zone;
each said outer fuel nozzle having at least one premix gas passage connected to at least one premix gas inlet and communicating with a plurality of radially extending premix fuel injectors disposed within a dedicated premix tube adapted to mix premix fuel and combustion air prior to entry into the single combustion zone located downstream of the premix tube;
said center nozzle having at least one premix gas passage connected to at least one premix gas inlet and communicating with a plurality of radially extending premix fuel injectors disposed within a dedicated premix tube adapted to mix premix fuel and combustion air prior to entry into the single combustion zone located downstream of the premix tube, and said center nozzle further having a diffusion gas passage connected to a diffusion gas inlet, said diffusion gas passage terminating at a forwardmost discharge end of said center fuel nozzle downstream of said premix fuel injectors but within said dedicated premix tube.
2. The gas turbine of claim 1, wherein said outer fuel nozzles also include a central liquid fuel passage and a water passage encircling said liquid fuel passage for discharging water into the combustion zone of the combustor.
3. The gas turbine of claim 2, wherein said outer fuel nozzles also include an atomizing air passage.
4. The gas turbine of claim 3, wherein said atomizing air passage is coaxial with said liquid fuel passage.
5. The gas turbine of claim 1, wherein said plurality of outer nozzles comprises from three to six outer nozzles, arranged in a circular array about said longitudinal axis of the combustor.
6. In a single stage gas turbine combustor capable of operating in premix and diffusion modes, an assembly comprising an annular array of outer nozzles arranged about a center axis and a center nozzle located on said center axis, wherein said center nozzle is adapted substantially only to connection to premix and diffusion fuel sources and said outer nozzles in said annular array are connected substantially only to premix and liquid fuel sources, a source of atomizing air, and a source of water for water injection.
7. The assembly of claim 6, wherein each said outer fuel nozzle has at least one premix gas passage connected to at least one premix gas inlet and communicating with a plurality of radially extending premix fuel injectors disposed within a dedicated premix tube adapted to mix premix fuel and combustion air prior to entry into a single combustion zone located downstream of the premix tube.
8. The assembly of claim 6, wherein said outer fuel nozzles each include a central liquid fuel passage and a water passage encircling said liquid fuel passage for discharging water into a combustion zone of the combustor.
9. The assembly of claim 6, wherein said array of outer nozzles comprises from three to six outer nozzles, arranged in a circular array about a longitudinal axis of the combustor.
10. The assembly of claim 6, wherein said center nozzle has at least one premix gas passage connected to at least one premix gas inlet and communicating with a plurality of radially extending premix fuel injectors disposed within a dedicated premix tube adapted to mix premix fuel and combustion air prior to entry into a single combustion zone located downstream of the premix tube, and said center nozzle further has a diffusion gas passage connected to a diffusion gas inlet, said diffusion gas passage terminating at a forwardmost discharge end of said center fuel nozzle downstream of said premix fuel injectors but within said dedicated premix tube.
11. A method of operating a combustor wherein the combustor has a plurality of outer fuel nozzles in an annular array arranged about a center axis and a center nozzle located on the center axis, and wherein the annular array is selectively supplied with premix fuel, liquid fuel, water and atomizing air, and further wherein the center nozzle is selectively supplied with diffusion fuel and premix fuel, the method comprising the steps of:
a) at start-up, supplying the center fuel nozzle with diffusion fuel;
b) as the unit load is raised, supplying premix fuel to at least one of the outer nozzles in the annular array;
c) at part load, ceasing diffusion fuel flow to the center nozzle and redirecting a corresponding percentage of fuel to at least one of the outer nozzles in the annular array, thereby to maintain fuel flow constant;
d) after load is further increased, initiating premix fuel supply to the center nozzle without adding to the supply of premix fuel to the outer fuel nozzles in the annular array; and then
e) selectively supplying additional premix fuel to all of the fuel nozzles in the annular array and to the center nozzle as the turbine load increases.
12. The method of claim 1, wherein each fuel nozzle in the annular array of outer nozzles includes an air swirler for swirling air passing through the combustor, and wherein, during steps b), d), and e), premix fuel is supplied to the annular array of outer nozzles at locations upstream of said air swirlers and discharged from said outer nozzles downstream of said air swirlers.