Antiparallel Thyristor Failure Detection via Alternating Phase Analysis
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Solution Overview
Problem
Existing methods fail to effectively detect failures in antiparallel thyristors, which are critical for controlling heater output in substrate processing apparatuses, leading to potential damage when failures occur in either the first or second thyristor.
Innovation Solution
A method involving detecting voltage and current differences when output commands are alternated between the first and second thyristors, allowing for the determination of failure modes and preventing heater damage by identifying abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing failure detection methods are used for antiparallel thyristors, then the detection process is simple, but the detection reliability is insufficient and failures in either the first or second thyristor cannot be effectively detected
Solution Approach 1:
The detection method segments the antiparallel thyristor detection into two separate detection phases: one for detecting failures in the first thyristor and another for detecting failures in the second thyristor. Each phase activates only one thyristor at a time, allowing independent and reliable failure detection for each component without interference from the other thyristor.
Solution Approach 2:
The control unit preliminarily prepares for failure detection by selectively activating only one thyristor (either the first or second) before performing the detection. This preliminary action ensures that the detection conditions are properly set up with the other thyristor inactivated, enabling reliable detection of failures in the active thyristor.
2Measurement precision
If one thyristor is activated for detection, then the detection of that specific thyristor is reliable, but the other thyristor cannot be detected simultaneously
Solution Approach 1:
The control unit performs periodic detection by alternately activating the first thyristor and the second thyristor in separate detection cycles. During each cycle, only one thyristor is activated for detection, ensuring precise failure detection. The system repeatedly switches between detecting the first thyristor and the second thyristor, maintaining measurement precision while systematically covering both components over time.
Data Source
AI summary
A method of detecting a failure of an antiparallel thyristor, wherein the antiparallel thyristor includes a first thyristor and a second thyristor connected in parallel and in opposite directions, and is configured to control power supplied from an alternating current power supply to a load, the method including: detecting, as a first detection value, a voltage or a current supplied to the load when ceasing an output command for the second thyristor and issuing an output command for the first thyristor; detecting, as a second detection value, the voltage or the current supplied to the load when ceasing the output command for the first thyristor and issuing the output command for the second thyristor; and determining the failure of the antiparallel thyristor based on a difference between the first detection value and the second detection value.