US 11,706,852 B2
Ribbon bond solution for reducing thermal stress on an intermittently operable chipset controlling RF application for cooking
Marco Carcano, Senago (IT); Michele Sclocchi, San Donato Milanese (IT); and Daniele Chirico, Brugherio (IT)
Assigned to ILLINOIS TOOL WORKS INC., Glenview, IL (US)
Filed by Illinois Tool Works Inc., Glenview, IL (US)
Filed on Nov. 18, 2019, as Appl. No. 16/686,521.
Claims priority of provisional application 62/769,225, filed on Nov. 19, 2018.
Prior Publication US 2020/0163174 A1, May 21, 2020
Int. Cl. H05B 6/68 (2006.01); H01L 23/66 (2006.01); H01L 23/00 (2006.01); H05B 6/66 (2006.01); H03F 3/213 (2006.01)
CPC H05B 6/687 (2013.01) [H01L 23/66 (2013.01); H01L 24/40 (2013.01); H01L 24/48 (2013.01); H01L 24/84 (2013.01); H01L 24/85 (2013.01); H03F 3/213 (2013.01); H05B 6/664 (2013.01); H05B 6/686 (2013.01); H01L 2223/6611 (2013.01); H01L 2223/6655 (2013.01); H01L 2224/40091 (2013.01); H01L 2224/40101 (2013.01); H01L 2224/40195 (2013.01); H01L 2224/45014 (2013.01); H01L 2224/4801 (2013.01); H01L 2224/48091 (2013.01); H01L 2224/48101 (2013.01); H01L 2224/48153 (2013.01); H01L 2924/30111 (2013.01); H03F 2200/222 (2013.01); H03F 2200/387 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An oven comprising: a cooking chamber configured to receive a food product; and a radio frequency (RF) heating system configured to provide RF energy into the cooking chamber using solid state electronic components to heat the food product, wherein the solid state electronic components include power amplifier electronics configured to provide a signal into the cooking chamber via a launcher assembly operably coupled to the cooking chamber via a waveguide assembly, wherein the power amplifier electronics are configured to control application of RF energy into the cooking chamber at least in part based on a learning procedure that generates a power cycling between high and low powers to determine an efficient combination of frequency and phase for application of the RF energy into the cooking chamber when the learning procedure is executed, wherein the power amplifier electronics include: a semiconductor die on which one or more RF power transistors are fabricated, an output matching network configured to provide impedance matching between the semiconductor die and external components operably coupled to an output tab, and a bonding ribbon that is bonded at terminal ends thereof to operably couple the one or more RF power transistors of the semiconductor die to the output matching network, and wherein the bonding ribbon has a width of greater than about five times a thickness of the bonding ribbon.