Power Converter Terminal Temperature Difference Detection
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Solution Overview
Problem
Existing power converter systems face challenges in quickly identifying loose connections in wiring terminals, which can lead to temperature rises and potential fires or short circuits due to increased contact resistance, especially in high-power devices.
Innovation Solution
A power converter system equipped with temperature detection units and a control unit that compares the temperature differences between wiring terminals to determine abnormal temperature rises caused by loose connections, improving detection efficiency and reducing misjudgments from high operating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional single threshold detection is used for wiring terminal temperature, then the detection method is simple, but misjudgments occur due to high operating temperatures
Solution Approach 1:
The patent changes the detection parameter from absolute temperature to temperature difference. Instead of comparing wiring terminal temperature against a fixed threshold, the system calculates the temperature difference between multiple wiring terminals and compares this difference against a threshold. This parameter transformation eliminates misjudgments caused by high operating temperatures, as the relative temperature difference remains stable even when absolute temperatures vary.
2Measurement precision
If relative temperature difference detection between wiring terminals is used, then detection accuracy improves, but detection system complexity increases
Solution Approach 1:
The patent merges multiple temperature detection functions into a unified temperature difference detection system. By integrating the temperature sensing, differential calculation, and threshold comparison into a single detection mechanism, the system achieves improved accuracy without proportionally increasing complexity. The control unit performs automated temperature difference calculation and comparison, reducing the need for separate detection circuits for each wiring terminal.
Solution Approach 2:
The system uses the wiring terminals themselves as reference points for detection. Each wiring terminal's temperature is compared against others in the same system, eliminating the need for external reference temperature sources. The system self-calibrates by using its own internal temperature distribution as the basis for detection, reducing external dependencies and system complexity.
3Reliability
If temperature monitoring is implemented for all wiring terminals, then safety improves, but detection time increases
Solution Approach 1:
The patent applies partial monitoring by focusing detection efforts on the temperature difference between wiring terminals rather than monitoring each terminal's absolute temperature independently. This selective approach detects abnormalities (loose connections) that manifest as temperature differences, achieving comprehensive safety monitoring with reduced detection time compared to exhaustive individual terminal monitoring.
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
The system effectively identifies loose connections by analyzing relative temperature changes, enhancing detection accuracy and preventing potential safety hazards by quickly identifying abnormal temperature rises.
Implementation Method 1
The plurality of temperature detection units are configured to detect temperature values of the plurality of wiring terminals
Implementation Method 2
when an absolute value of a difference between a temperature value of one wiring terminal in the plurality of wiring terminals and a first reference temperature value is greater than or equal to a first temperature difference threshold
Implementation Method 3
when the wiring terminal is loosely connected, a contact resistance increases due to poor contact of a crimping surface. For high-power devices, a loose connection causes a rise in a temperature of the wiring terminal
Data Source
AI summary
Example power converters and detection methods are described. One example power converter includes a control device, a plurality of wiring terminals, a power conversion circuit, and a plurality of temperature detection devices. The control device is configured to: when an absolute value of a difference between a temperature value of one wiring terminal in the plurality of wiring terminals and a first reference temperature value is greater than or equal to a first temperature difference threshold, output a signal indicating that an abnormality occurs in the plurality of wiring terminals. In this application, a relative change of a temperature of one wiring terminal relative to another wiring terminal can be directly determined based on temperature values of the plurality of wiring terminals, thereby quickly determining, based on a magnitude of the relative change, whether there is an abnormal temperature rise caused by loose connections in the plurality of wiring terminals.