Asynchronous Load Current Switching for DC Fault Response
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Solution Overview
Problem
Existing power distribution systems face challenges in safely transmitting high voltage DC power over long distances due to the risk of electrical shocks from faults, particularly line-to-line faults, which are not effectively managed by current solutions that require low-latency communication links or precise calibration, leading to inefficiencies and safety risks.
Innovation Solution
A fault-responsive power system using asynchronous load current switching, where a fault management controller measures supply-side currents, determines if they exceed a magnitude threshold for a duration threshold, and reduces the current using remote-side switches without synchronization, allowing for fault management without requiring low-latency communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If centralized bulk powering transmits elevated voltage over a single dedicated power conductor pair, then power transmission efficiency and safety are improved, but the risk of electrical shocks from faults increases
Solution Approach 1:
The system uses periodic pulsed power delivery instead of continuous power transmission. The power supply delivers power in pulses to the load, with the ability to quickly interrupt the pulses when faults are detected. This periodic action allows for rapid fault response while maintaining efficient power transmission during normal operation.
Solution Approach 2:
The system implements self-service fault management by using the load itself to generate fault detection signals. When a fault occurs, the load's electrical characteristics change, which is detected by the power supply's control circuitry, automatically triggering fault response without requiring external monitoring devices or communication links.
2Speed
If traditional fault management uses low-latency communication links between power supply and load, then fault detection speed is improved, but system complexity and cost increase
Solution Approach 1:
The invention extracts the fault detection function from the communication link and integrates it directly into the power supply's control circuitry. The power supply monitors the load's electrical characteristics directly through the power connection, eliminating the need for separate communication infrastructure while maintaining fast fault detection capability.
Solution Approach 2:
The power supply's control circuitry performs multiple functions: it generates pulsed power, monitors load characteristics for fault detection, and controls power interruption. This multi-functionality eliminates the need for separate dedicated fault detection devices and communication systems, reducing overall system complexity.
3Reliability
If RFT-V line powering uses multiple conductor pairs in one-to-one configuration, then power distribution reliability is improved, but cable weight and cost increase
Solution Approach 1:
The system merges multiple power distribution functions into a single conductor pair. By using pulsed power delivery and intelligent control, the invention enables one conductor pair to serve multiple loads reliably, eliminating the need for separate conductor pairs for each load and significantly reducing cable weight.
4Length of stationary object
If centralized bulk powering uses elevated voltage transmission, then power transmission distance is improved, but safety risks from faults increase
Solution Approach 1:
The system uses periodic pulsed power delivery that can be rapidly interrupted. This allows elevated voltage to be transmitted over long distances efficiently, while the pulsed nature enables quick disconnection when faults are detected, mitigating safety risks associated with high voltage.
Solution Approach 2:
The system implements preliminary fault detection by continuously monitoring load characteristics during normal power transmission. By detecting faults early in their development, the system can take preventive action before dangerous conditions develop, allowing safe operation at elevated voltages over long distances.
Data Source
AI summary
A fault-responsive power system and method using asynchronous load current switching. A first supply-side current that flows from a power supply into a first conductor, which electrically couples the power supply to a load, is measured. Power is delivered to the load by modulating a first remote-side current on and off, with the remote-side current entering the load from the first conductor. Once it is determined that the first supply-side current has met or exceeded a magnitude threshold for at least a duration threshold, the first supply-side current is reduced such that the first supply-side current is less than the magnitude threshold. A data signal may also be transmitted by embedding a data signal in the first remote-side current through the modulation of the first remote-side current, and demodulating the data signal in the first supply-side current.