IC Chip Temperature Ramp Control in Two-Phase Immersion Cooling
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Solution Overview
Problem
Two-phase immersion cooling systems for IC chips face challenges in maintaining safe operating temperatures during the convection regime, leading to potential overheating and damage due to uncontrolled heat dissipation, which can degrade thermal interface materials and reduce computing performance.
Innovation Solution
A controller adjusts clock frequencies and power supply voltages of IC chips based on predicted future temperatures, using a combination of feedback and feed-forward methods to maintain temperatures within a target range, accounting for physical proximity and convective heat dissipation, and adapts to changes in the cooling fluid's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IC chips operate at full capacity in two-phase cooling systems during convection regime, then computing performance is maximized, but temperatures rise uncontrollably causing overheating and damage
Solution Approach 1:
The controller performs feed-forward temperature prediction before actual temperature escalation occurs, using thermal models to anticipate future temperature states based on current operating conditions. This allows preventive action to be taken before overheating occurs, enabling full-capacity operation while maintaining thermal safety.
Solution Approach 2:
The system dynamically adjusts clock frequencies and power supply voltages in real-time based on predicted temperature trajectories. This dynamic control enables the system to operate at maximum performance when thermal conditions permit while automatically scaling back when temperature risks are detected, resolving the contradiction between productivity and reliability.
2Productivity
If clock frequencies and power supply voltages are increased to improve computing performance, then productivity increases, but heat dissipation becomes uncontrolled leading to thermal damage
Solution Approach 1:
The system implements closed-loop feedback control where actual temperature measurements from sensors are continuously fed back to the controller. This feedback is combined with feed-forward predictions to make informed decisions about clock frequency and voltage adjustments, ensuring productivity gains do not exceed thermal safety limits.
Solution Approach 2:
The controller dynamically changes operating parameters (clock frequencies and power supply voltages) based on real-time thermal conditions and predictions. By adjusting these parameters within safe operating ranges, the system maximizes computing performance while maintaining controlled heat dissipation that prevents thermal damage.
3Device complexity
If uniform clock frequencies are applied to all IC chips for simplicity, then device complexity is reduced, but individual thermal characteristics cannot be optimized
Solution Approach 1:
The controller divides the IC chip array into individual controllable units, applying segmented control strategies to each chip based on its specific thermal characteristics and spatial location. This segmentation enables optimized thermal management for each chip while maintaining relatively simple control logic through modular temperature prediction and control algorithms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures safe and efficient ramping of IC chips from startup to full-capacity operation, preventing overheating and maintaining computing performance by dynamically controlling power and clock frequencies, even in rapidly changing convection regimes.
Implementation Method 1
The circuit board is configured to be immersed in a two-phase cooling fluid
Implementation Method 2
two-phase cooling fluid
Data Source
AI summary
A circuit system includes a circuit board including a plurality of integrated circuit (IC) chips. The circuit board is configured to be immersed in a two-phase cooling fluid. The circuit system includes a controller. The controller is configured to, in a control process: obtain temperature data indicative of respective internal temperatures of the plurality of IC chips, predict respective future internal temperatures of the plurality of IC chips based on the respective internal temperatures, and adjust clock frequencies and power supply voltages of the plurality of the IC chips such that the predicted respective future internal temperatures are within a target temperature range. A clock frequency of a first IC chip of the plurality of IC chips is adjusted to be different from a clock frequency of a second IC chip of the plurality of IC chips.