Vacuum Pumping Control Logic for Semiconductor Load Matching
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Solution Overview
Problem
Vacuum pumping apparatuses in semiconductor fabrication facilities are often oversized to meet peak demands, leading to inefficiencies such as excessive energy consumption and wear due to underutilization during periods of lower load.
Innovation Solution
A vacuum pumping apparatus with a common pumping line and control logic that adjusts the operation of primary vacuum pumps and downstream equipment based on the operating state of multiple vacuum processing chambers, allowing for varying pump speeds, deactivation of unused pumps, and optimized energy supply to match the actual load, thereby reducing energy usage and extending equipment lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum pumping apparatus is oversized to meet peak demands, then the system can handle maximum load requirements, but energy consumption increases and equipment wear occurs during underutilization
Solution Approach 1:
The patent implements dynamic control of vacuum pumping systems by adjusting pump operation based on real-time monitoring of chamber vacuum levels and processing chamber status. The control logic dynamically scales pump capacity to match actual demand, transitioning from static oversized sizing to adaptive operation that maintains reliability while reducing energy consumption during partial load conditions
Solution Approach 2:
The system changes operational parameters by monitoring vacuum pressure levels and processing chamber states, then adjusting pump speed, valve positions, and pump activation/deactivation based on these parameter changes. This allows the system to maintain peak capability when needed while operating at reduced parameters during normal conditions, resolving the contradiction between reliability and energy use
2Reliability
If vacuum pumping apparatus is oversized to meet peak demands, then the system can handle maximum load requirements, but equipment wear increases due to continuous operation
Solution Approach 1:
The control logic dynamically adjusts pump operation based on actual system needs, activating pumps only when vacuum levels require pumping capacity. This dynamic on/off and speed adjustment reduces continuous operation wear while maintaining the ability to meet peak demands, thereby extending equipment lifespan without sacrificing reliability
Solution Approach 2:
The system employs feedback control by continuously monitoring vacuum chamber pressure and processing chamber status, then using this feedback to determine when pumps should operate at full capacity, partial capacity, or remain idle. This feedback mechanism ensures pumps run only when necessary, reducing wear while maintaining reliability for peak load handling
3Use of energy by moving object
If control logic adjusts pump operation to match actual load, then energy savings are achieved, but system complexity increases
Solution Approach 1:
The control logic uses feedback from vacuum pressure sensors and processing chamber status signals to automatically adjust pump operation. This feedback-based approach achieves energy savings through intelligent control while keeping the system relatively simple by relying on standard sensor feedback loops rather than complex predictive algorithms or multiple interconnected control systems
Solution Approach 2:
The vacuum pumping system performs self-service control by automatically monitoring its own operational state through vacuum level sensing and autonomously adjusting pump operation accordingly. This self-regulating capability achieves energy optimization without requiring complex external control systems, as the system serves its own control needs through integrated sensing and actuation
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 solution enables significant energy savings and reduced wear on equipment by ensuring that vacuum pumping systems operate only at the required capacity, matching performance with the actual load from processing chambers, thereby optimizing efficiency and extending the lifespan of the equipment.
Implementation Method 1
at least one primary vacuum pump in fluid communication with the pumping line outlet to pump gas from each vacuum processing chamber
Data Source
AI summary
A vacuum pumping apparatus may include: a common pumping line having a plurality of pumping line inlets and a pumping line outlet, each pumping line inlet being configured to couple with an outlet of an associated plurality of vacuum processing chambers; at least one primary vacuum pump in fluid communication with the pumping line outlet to pump gas from each vacuum processing chamber; and control logic operable to control operation of the primary vacuum pump in response to an indication of an operating state of the plurality of vacuum processing chambers. In this way, the performance of the primary vacuum pump can be adjusted to match the load provided by the processing chambers and when there is an excess capacity, the performance of the primary vacuum pumps can be reduced, which can lead to significant energy savings and reduce wear on the pump.