An Online Proactive CTR Monitoring Method for Optocoupler in Automotive Auxiliary Converter

Automotive auxiliary converter empowers the electronic system, the failure of which will affect the system performance. As a critical component in the feedback loop of the converter, real-time health monitoring for optocoupler is of great importance. The degraded optocoupler mainly shows a falling c...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2021, Vol.70, p.1-13
Main Authors: Wu, Chenhao, Liu, Jincheng, Wang, Li, Su, Yongqing, Yue, Jiguang
Format: Article
Language:English
Subjects:
Ambient temperature
Automotive auxiliary converter
Automotive electronics
Automotive engineering
Batteries
boost-<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">LLC converter
Converters
Critical components
current transfer ratio (CTR)
Electrical measurement
Electronic systems
Embedded systems
Feedback loops
Monitoring
online health monitoring
optocoupler
Oscillators
Switching converters
Time synchronization
Transformers
Voltage control
Wireless communications
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Summary:Automotive auxiliary converter empowers the electronic system, the failure of which will affect the system performance. As a critical component in the feedback loop of the converter, real-time health monitoring for optocoupler is of great importance. The degraded optocoupler mainly shows a falling current transfer ratio (CTR). This article proposes an online proactive CTR monitoring method for optocoupler via voltage measurement of critical nodes. The monitored CTR can indicate the health condition of the optocoupler. First, the principle of a boost- LLC converter is analyzed in detail. Then, the influences of degraded CTR on the feedback loop are derived. An online proactive CTR monitoring scheme is introduced. The realization of voltage measurement, signal filtering, wireless communication, and time synchronization are in two independent embedded systems. CTR will be calculated in the local server and be stored in the local database. The proposed method can monitor CTR for both unaged and aged optocouplers. Effects of switching frequency and ambient temperature are also incorporated for online CTR monitoring. Experimental results validate the superiority of this online proactive monitoring method. The method could be extended and further evaluate the health condition of the overall automotive auxiliary converter.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2021.3115582