LC Filter Abnormality Detection via Temperature Monitoring
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Solution Overview
Problem
Conventional power conversion devices with LC filters do not have a mechanism to detect opposite connections of input and output lines, leading to high-frequency overcurrents, overheating, and potential device malfunction or breakage due to the asymmetrical configuration of the LC filter.
Innovation Solution
Incorporating a temperature detection element within the LC filter unit and a determination unit in the power conversion unit to calculate temperature rise values or differences, allowing for the detection of abnormal conditions such as opposite connections and preventing further damage by stopping the PWM converter when abnormal temperatures are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the LC filter uses an asymmetrical configuration with small inductance on the AC power source side to reduce filter size and cost, then the device size and cost are reduced, but opposite connection of input and output lines causes high frequency overcurrent, overheating, and potential breakage
Solution Approach 1:
The patent applies preliminary action by providing temperature detection elements and a determination unit that detect abnormal temperature rises before they cause device breakage. The system proactively identifies opposite connection conditions through temperature monitoring and calculates temperature rise values to determine abnormalities, allowing the device to take preventive action before catastrophic failure occurs.
Solution Approach 2:
The patent implements feedback by using temperature detection elements to continuously monitor the thermal state of the LC filter components and feeding this information back to the determination unit. The determination unit processes this feedback to calculate temperature rise values and identify opposite connection conditions, creating a closed-loop monitoring system that enables real-time detection and response to abnormal conditions.
2Ease of manufacture
If the LC filter uses small inductance on the AC power source side to reduce heat measures, then manufacturing cost is reduced, but opposite connection causes the inductance and damping resistor to overheat
Solution Approach 1:
The patent applies preliminary action by implementing temperature detection elements and a determination unit that identify abnormal temperature rises before they lead to component overheating and failure. The system proactively detects opposite connection conditions through thermal monitoring, allowing preventive measures to be taken before the inductance and damping resistor reach dangerous temperature levels.
Solution Approach 2:
The patent implements feedback by continuously monitoring component temperatures through detection elements and feeding this information back to the determination unit. The determination unit processes this feedback to calculate temperature rise values and identify when opposite connection is occurring, enabling real-time thermal management and prevention of overheating damage.
3Device complexity
If no temperature detection mechanism is provided in the LC filter, then device complexity is reduced, but the device cannot detect opposite connection and continues operating in abnormal condition
Solution Approach 1:
The patent applies preliminary action by incorporating temperature detection elements and a determination unit that proactively identify abnormal conditions before they cause device malfunction or breakage. The system performs preliminary detection of opposite connections through temperature monitoring and calculates temperature rise values to determine abnormalities, enabling early intervention.
Solution Approach 2:
The patent implements feedback by using temperature detection elements to continuously monitor the thermal state of LC filter components and feeding this information back to the determination unit. This feedback mechanism enables the system to detect opposite connection conditions and take appropriate action, resolving the contradiction between simplicity and reliability.
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
Prevents malfunction and potential breakage by accurately detecting opposite connections and preventing overheating, ensuring the LC filter operates within safe temperature limits.
Implementation Method 1
a temperature detection element provided in one part or in a plurality of parts configuring the LC filter unit
Data Source
AI summary
The power conversion device includes an AC power source, a power conversion unit, and an LC filter unit arranged between the AC power source and the power conversion unit, and the LC filter unit has a temperature detection element provided in one part or in a plurality of parts configuring the LC filter unit, and the power conversion unit has a temperature detection unit configured to receive temperature data detected by the temperature detection element and a determination unit configured to calculate temperature rise values of one or plurality of parts, or temperature differences between the plurality of parts based on the temperature data received by the temperature detection unit and to determine whether or not there is an abnormality in the LC filter unit in accordance with the calculation result.