Contactor Wear Tracking for Load-Breaking Mobile Power Circuits
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Solution Overview
Problem
Electrical power distribution in mobile applications faces challenges such as highly variable loads, thermal and mechanical stresses on fuses, high costs due to downtime, and complexity in integrating multiple components with varying load types and power conversion systems, leading to inefficiencies and reliability issues.
Innovation Solution
The development of a power distribution unit (PDU) with improved DC/DC conversion capabilities, reduced component count, and enhanced interfaces for power management components, including fuses, contactors, and inverters, which reduces the number of interfaces and packaging size, and provides improved power density and flexibility for mobile electric applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple components with varying load types and power conversion systems are integrated, then power distribution capability is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal power distribution unit that can handle multiple load types (resistive, inductive, capacitive) and power conversion requirements through a single integrated controller. The controller automatically detects load characteristics and adjusts conversion parameters, eliminating the need for separate dedicated circuits for each load type and reducing overall system complexity.
Solution Approach 2:
The system employs dynamic parameter adjustment where the controller continuously monitors load conditions and modifies conversion frequency, voltage, and current parameters in real-time. This dynamic adaptation allows the same hardware to efficiently serve multiple functionally different loads without requiring complex static circuit design for each scenario.
2Power
If fuse rating is increased to handle peak loads, then power throughput capability is improved, but thermal and mechanical stresses on fuse increase
Solution Approach 1:
The patent implements periodic pulse-width modulated (PWM) power delivery where power is delivered in controlled pulses rather than continuous flow. The controller switches power delivery on and off at high frequency, allowing the fuse to handle peak loads intermittently without sustained thermal stress, while still achieving the required average power throughput capability.
Solution Approach 2:
The system dynamically adjusts the duty cycle of power delivery based on instantaneous load requirements. During peak demand moments, the controller increases pulse width temporarily, but maintains lower average power levels through periodic off-states, preventing the fuse from experiencing continuous thermal and mechanical stress while still meeting peak power requirements.
3Measurement precision
If highly invasive active determinations are performed for diagnostics, then measurement precision is improved, but application performance deteriorates
Solution Approach 1:
The power distribution unit performs self-diagnostics by monitoring its own operational parameters (current, voltage, temperature, switch node voltages) during normal operation. The controller uses built-in sensors and measurement circuits to continuously assess system health and electrical characteristics without requiring external test equipment or invasive probing that would disrupt application performance.
Solution Approach 2:
The diagnostic measurements are performed continuously during normal power delivery operations rather than requiring system shutdown or interruption. The controller samples electrical parameters at appropriate moments within the PWM cycle, ensuring that diagnostics occur without breaking the continuity of useful power delivery to the load.
Data Source
AI summary
A method includes interpreting a contactor open event and a contactor load value for a contactor positioned on a motive power circuit for a mobile application, determining that a contactor opening event under load has occurred in response to the contactor open event and the contactor load value, and updating a contactor wear condition in response to the contactor opening event under load, wherein updating the contactor wear condition comprises accumulating a number of the contactor opening events under load.