Transport Refrigeration Power Coupling Fault Detection
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Solution Overview
Problem
Electrical couplings in transport refrigeration systems are prone to deterioration and degradation due to vibrations and corrosion, leading to potential risks such as excessive heat generation and electrical current transmission.
Innovation Solution
An electrical apparatus with a rectifier, DC-DC converter, and controller that monitors voltage differences between the rectifier and DC-DC converter to detect compromised couplings, entering error handling modes based on trigger criteria to deactivate the rectifier and provide alerts, minimizing the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage monitoring is implemented to detect degraded electrical couplings, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The system uses its own existing voltage sensors and control unit to monitor voltage differences across electrical couplings. The rectifier's voltage sensor monitors the output voltage, and the control unit compares this with the voltage at the DC-DC converter input, enabling the system to self-diagnose coupling degradation without external monitoring equipment.
Solution Approach 2:
The control unit performs multiple functions: it controls the rectifier operation, manages the DC-DC converter, and simultaneously monitors voltage differences to detect coupling degradation. The existing voltage sensors serve dual purposes - regulating voltage for normal operation and providing data for safety monitoring of electrical couplings.
2Measurement precision
If additional voltage sensors are added to monitor electrical couplings, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The control unit utilizes voltage signals from existing sensors that are already part of the system's normal operation. The rectifier's output voltage sensor and the DC-DC converter's input voltage sensor are repurposed to provide coupling monitoring data, eliminating the need for dedicated monitoring sensors.
Solution Approach 2:
The control unit acts as an intermediary that processes voltage information from existing sensors to infer the condition of electrical couplings. Rather than directly measuring coupling degradation, the system uses voltage difference measurements as an indirect indicator, with the control unit interpreting these measurements to detect problems.
Data Source
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AI summary
The present disclosure relates to an electrical apparatus 100 for a transport refrigeration system 20. The electrical apparatus 100 comprises: a voltage source 120 configured to output a supply voltage; a load 130 having an input 132 electrically coupled to an output 124 of the voltage source 120; and a controller 190. The controller 190 is configured to: monitor the supply voltage output by the voltage source 120 and a voltage received by the load 130 at the input 132 of the load; determine whether a trigger criterion has been met based on a comparison of the supply voltage and the voltage received by the load 130 from the input 132 of the load 130; and cause the electrical apparatus to enter an error handling mode in response to a determination that the trigger criterion has been met.