Triple-Pole DC Switch Layout for Three-Wire Bus Isolation
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Solution Overview
Problem
Existing direct current power supply systems with three wires require large double-pole switches, resulting in a bulky size and high costs due to the large cross-sectional area needed for overcurrent protection and isolation, which complicates maintenance and reduces protection reliability.
Innovation Solution
The system employs N triple-pole direct current switches with a positive, M, and negative bus configuration, where each triple-pole switch connects and disconnects simultaneously to provide overcurrent protection and isolation, reducing the size and cost by using a smaller cross-sectional area for the M-electrode, and allowing for efficient fault protection across all electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two double-pole direct current switches are used to protect and isolate one power supply device, then overcurrent protection and isolation are achieved, but the size of the direct current power supply system becomes large
Solution Approach 1:
The patent combines the functions of two separate double-pole direct current switches into a single triple-pole direct current switch. This switch integrates three independent poles (positive pole, M pole, and negative pole) that can simultaneously open and close, providing overcurrent protection and isolation for one power supply device while reducing the overall system size and component count.
2Reliability
If two double-pole direct current switches are used for protection, then reliability is improved, but costs increase due to larger cross-sectional area
Solution Approach 1:
The patent merges two double-pole switches into one triple-pole switch, reducing the total cross-sectional area required. The triple-pole switch has a more efficient structure where three poles share common components and mounting space, resulting in lower material costs and manufacturing expenses compared to two separate double-pole switches.
3Reliability
If two double-pole direct current switches are used, then protection coverage is sufficient, but maintenance and operation become complicated
Solution Approach 1:
The patent combines multiple switching functions into a single triple-pole direct current switch that operates as one unified device. All three poles (positive, M, and negative) open and close simultaneously, providing comprehensive protection coverage while simplifying operation and maintenance to a single device rather than coordinating two separate switches.
Data Source
AI summary
A direct current power supply system includes N power supply devices, N triple-pole direct current switches, a positive bus, an M bus, and a negative bus. A positive input terminal of an ith triple-pole direct current switch is coupled to a first output terminal of an ith power supply device, an M input terminal of the ith triple-pole direct current switch is coupled to a second output terminal of the ith power supply device, a negative input terminal of the ith triple-pole direct current switch is coupled to a third output terminal of the ith power supply device, a positive output terminal of the ith triple-pole direct current switch is coupled to the positive bus, an M input terminal of the ith triple-pole direct current switch is coupled to the M bus, and a negative output terminal of the ith triple-pole direct current switch is coupled to the negative bus.