US 12,426,212 B2
Combined liquid and air cooling system for fail-safe operation of high power density ASIC devices
M. Baris Dogruoz, Santa Clara, CA (US); and Joel Goergen, Soulsbyville, CA (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Apr. 14, 2022, as Appl. No. 17/720,436.
Application 17/720,436 is a continuation of application No. 16/697,463, filed on Nov. 27, 2019, granted, now 11,343,945.
Claims priority of provisional application 62/913,381, filed on Oct. 10, 2019.
Prior Publication US 2022/0240419 A1, Jul. 28, 2022
Int. Cl. H05K 7/20 (2006.01); H05K 1/02 (2006.01)
CPC H05K 7/20509 (2013.01) [H05K 1/0209 (2013.01); H05K 7/20154 (2013.01); H05K 7/20254 (2013.01); H05K 2201/064 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing a combined liquid and air cooling system over a printed circuit board (PCB) of an electronic device, the PCB including a plurality of components including an integrated circuit package and at least one other component, the integrated circuit package comprising an application specific integrated circuit (ASIC) die and a plurality of high bandwidth memory (HBM) modules, and the combined liquid and air cooling system comprising a liquid cooling system located over the integrated circuit package and an air cooling system integrated with the liquid cooling system and a portion of the PCB; and
in a first mode of operation:
providing a flow of a coolant fluid within a closed recirculation loop and through a cold plate of the liquid cooling system to cool the ASIC die and the plurality of HBM modules of the integrated circuit package during operation of the electronic device; and
directing, via an airflow device of the air cooling system, a flow of air at different flow rates through a plurality of heat sinks of the air cooling system to cool the plurality of components of the PCB, wherein a direction of the flow of air through the plurality of heat sinks at the different flow rates is transverse to a direction of the flow of the coolant fluid, wherein the combined liquid and air cooling system utilizes the air cooling system to cool the at least one other component.