Semiconductor Exhaust Control for Variable Gas Flow and Pump Load
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Solution Overview
Problem
Conventional exhaust systems in semiconductor manufacturing apparatuses operate inefficiently due to lack of consideration for optimal conditions based on gas type and flow rate, leading to excess energy consumption, improper maintenance timing, and equipment failures.
Innovation Solution
An exhaust system with a controller that adjusts the operation of vacuum pumps, exhaust gas treatment apparatuses, and diluent N2 units based on specific process information, including gas type and flow rate, to optimize energy use and schedule maintenance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ON/OFF control based on predetermined operation processes is used, then the exhaust system can be operated with simple control logic, but energy consumption increases due to lack of optimization based on actual gas type and flow rate
Solution Approach 1:
The control system transitions from static ON/OFF control to dynamic control that continuously adjusts vacuum pump and exhaust gas treatment apparatus operations based on real-time process information including gas type and flow rate. The controller modifies operational parameters dynamically to match actual process conditions, optimizing energy consumption while maintaining ease of operation through automated adjustment.
Solution Approach 2:
The system changes operational parameters (vacuum pump speed, exhaust gas treatment apparatus settings) based on varying process parameters (gas type, flow rate). By monitoring and responding to changes in process conditions, the controller adjusts system parameters to maintain optimal efficiency without requiring complex manual intervention.
2Reliability
If excess pumping capacity is used, then vacuum requirements are reliably met, but energy consumption increases
Solution Approach 1:
The vacuum pump operates with variable speed control rather than fixed high capacity. The controller dynamically adjusts the pump speed to match the actual vacuum requirements determined by process information, ensuring reliable vacuum maintenance while consuming only the necessary energy without excessive capacity operation.
Solution Approach 2:
The system uses feedback from process information (gas type, flow rate, chamber pressure requirements) to continuously monitor and adjust vacuum pump operation. This closed-loop control ensures the pump operates at the minimum necessary capacity to maintain vacuum reliability, preventing energy waste from excessive pumping capacity.
3Reliability
If excess combustion capacity is used, then exhaust gas treatment is reliably ensured, but fuel consumption increases
Solution Approach 1:
The exhaust gas treatment apparatus operates with dynamically adjusted combustion capacity based on actual exhaust gas composition and flow rate. The controller modifies fuel supply and combustion parameters in real-time to match the treatment requirements, ensuring reliable exhaust gas processing while minimizing fuel consumption through optimized combustion capacity utilization.
Solution Approach 2:
The system changes combustion parameters (fuel flow rate, air-to-fuel ratio, combustion temperature) based on variations in exhaust gas characteristics. By adjusting these parameters according to actual process conditions, the system maintains reliable exhaust gas treatment while optimizing fuel efficiency and reducing energy loss.
4Reliability
If maintenance is performed based on accumulated operational data, then maintenance timing is optimized, but requires complex monitoring systems
Solution Approach 1:
The existing controller performs multiple functions: process control, energy optimization, and maintenance scheduling. By integrating maintenance monitoring into the existing control system, the patent avoids adding separate complex monitoring hardware while utilizing accumulated operational data from normal process control to trigger maintenance alerts at optimal timing.
Solution Approach 2:
The system automatically tracks its own operational parameters and accumulates usage data to determine when maintenance is needed. The controller self-monitors operational hours, gas processing volumes, and other relevant metrics, generating maintenance alerts without requiring external complex monitoring systems, thereby optimizing maintenance timing with minimal additional complexity.
Data Source
AI summary
An exhaust system (2) is used for evacuating a chamber of a manufacturing apparatus (1) for manufacturing semiconductor devices, liquid crystal panels, LEDs, or solar cells. The exhaust system (2) includes a vacuum pump apparatus (3) for evacuating the chamber, an exhaust gas treatment apparatus (5) for treating an exhaust gas discharged from the chamber, and a controller (6) for controlling the vacuum pump apparatus (3) and/or the exhaust gas treatment apparatus (5). Information of operation process of the manufacturing apparatus (1), and the kind of gas and the flow rate of the gas supplied to the manufacturing apparatus (1) is inputted into the controller (6) to control the vacuum pump apparatus (3) and/or the exhaust gas treatment apparatus (5).