Heater Array Failure Compensation for Single Diode Faults
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Solution Overview
Problem
In plasma tool systems, undetected diode failures in heater arrays lead to out-of-control heating profiles, resulting in costly wafer loss and system downtime, as existing methods fail to detect and compensate for single diode failures in real-time, necessitating immediate component replacement and shutdown.
Innovation Solution
A method and system for identifying and compensating for single diode failures in heater arrays, involving confirmation, location identification, and recovery processes, which allow continued operation of the plasma tool and extended component life by adjusting power duty cycles and ordering replacement parts in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a diode failure in the heater array is not detected, then the plasma tool continues operating, but the heating profile becomes out of control resulting in wafer loss
Solution Approach 1:
The system implements real-time monitoring of diode health status by measuring forward voltage across each diode in the heater array. When a diode's forward voltage exceeds a threshold indicating failure, the system detects the failure and triggers compensation actions. This feedback mechanism allows continuous operation while maintaining heating profile control by identifying and compensating for failed diodes.
Solution Approach 2:
The system changes operational parameters by adjusting the duty cycle of heaters adjacent to failed diodes. When a diode failure is detected, the controller increases the duty cycle of neighboring heaters to compensate for the lost heating capacity. This parameter adjustment maintains the overall heating profile despite the failure, enabling continuous productive operation.
2Reliability
If the plasma tool is stopped for component replacement upon diode failure, then component reliability is maintained, but system downtime increases and productivity decreases
Solution Approach 1:
The system performs preliminary detection and identification of failed diodes before they cause catastrophic failures or affect wafer quality. By monitoring diode forward voltage in real-time, the system identifies failures early and triggers compensation protocols, allowing the component to continue operating reliably rather than requiring immediate shutdown and replacement.
Solution Approach 2:
Instead of discarding the heater array component upon diode failure, the system recovers by compensating for the failed diode through duty cycle adjustments of adjacent heaters. This allows the component to continue operating at reduced but acceptable performance levels, extending its useful life and avoiding premature replacement.
3Measurement precision
If all heaters in the array are monitored individually for failure, then detection precision is improved, but device complexity increases
Solution Approach 1:
The heater array is segmented into multiple independently monitored zones, each with its own diode. The monitoring system measures the forward voltage of each diode individually to detect failures. This segmentation allows precise identification of which specific diode has failed, enabling targeted compensation rather than requiring monitoring of the entire array as a single unit.
Solution Approach 2:
The system uses the existing electrical circuitry of the heater array itself to perform monitoring. By measuring the forward voltage drop across each diode during normal operation, the system leverages the operational current to detect failures without requiring separate test circuits or additional hardware. This self-service approach maintains detection precision while minimizing added complexity.
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
Enables the continued operation of plasma tools, minimizes wafer loss, and reduces downtime by detecting single diode failures, allowing for extended component life and parallel ordering of replacements, thus maintaining productivity and reducing costs.
Implementation Method 1
each node, i.e., a heater, has a diode and a resistor heating element
Data Source
AI summary
Systems and methods for identifying a single failure in a heater array and compensating for the failure are described. The methods include identifying two X buses and two Y buses of the heater array having a location of the failure. A confirmation of the single failure within the heater array is performed after identifying the two X and two Y buses. Once the single failure is confirmed, the location of the failure is identified. The methods include compensating for the single failure by adjusting a duty cycle of a heater at the location of the failure, adjusting additional duty cycles of heaters along the same X bus as the failed heater and the same Y bus as the failed heater, and maintaining remaining duty cycles of power provided to remaining heaters of the heater array.