Low-Voltage DC Switching Device With Parallel Thyristor Circuits
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Solution Overview
Problem
Existing low-voltage power distribution fast switching devices are not suitable for DC power distribution systems, as they are primarily designed for AC power distribution systems, leading to inefficiencies and reliability issues in DC power distribution systems.
Innovation Solution
A low-voltage DC power distribution fast switching device with multiple parallel switching circuits, including a thyristor and diode clusters, a common diode cluster, and a delay circuit, which allows for automatic switching among power supplies without control system intervention, ensuring reliable power supply to loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing low-voltage power distribution fast switching devices designed for AC power distribution systems are used, then the device structure is available, but the device is not suitable for DC power distribution systems
Solution Approach 1:
The patent modifies the switching device parameters by replacing AC-appropriate components with DC-optimized components, including using DC-rated thyristors, configuring diode clusters with appropriate forward voltage drops for DC operation, and adjusting circuit topology to eliminate AC-specific protective measures while maintaining DC reliability
Solution Approach 2:
The switching device is divided into multiple independent switching circuits, each capable of independently switching between power supplies. This segmentation allows each circuit to be optimized for DC operation while providing redundant power supply paths, thereby improving both DC adaptability and power supply reliability
2Speed
If automatic switching without control system intervention is implemented, then switching speed is improved, but control precision may be reduced
Solution Approach 1:
The switching device employs self-service automatic switching where the diode clusters and thyristors automatically conduct or block based on voltage potentials and current directions. The circuit inherently determines switching actions through electrical parameters without external control signals, achieving both high switching speed and sufficient precision for power supply switching applications
3Reliability
If multiple parallel switching circuits are used, then power supply reliability is improved, but device complexity increases
Solution Approach 1:
Multiple switching circuits share common components including the diode clusters, thyristor mounting structure, and terminal connections. This merging approach allows parallel redundancy for improved reliability while minimizing the increase in overall device complexity through component sharing and standardized modular configurations
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 device achieves uninterrupted automatic switching, reduces on-state losses, and provides reliable power by controlling the thyristor conduction and adjusting diode cluster voltage drops, enhancing power distribution efficiency and reliability in DC systems.
Implementation Method 1
a thyristor connected between the positive input terminal and the positive output terminal; the positive input terminal is electrically connected to the anode of the supplementary diode cluster, and the positive input terminal is electrically connected to the anode of the thyristor, the positive output terminal is electrically connected to the cathode of the complementary diode cluster, and the positive output terminal is electrically connected to the cathode of the thyristor
Implementation Method 2
a supplementary diode cluster composed of no less than one diode connected in series... With the forward voltage drop of the complementary diode cluster to clamp the load voltage
Implementation Method 3
the device further includes a common negative terminal electrically connected to the negative pole of one of the common negative power supplies and the negative pole of the load, and the common negative terminal is electrically connected to the positive output terminal through a delay circuit. The delay circuit includes a delay capacitor
Data Source
AI summary
Disclosed is a low-voltage DC power distribution fast switching device. The device includes a positive output terminal electrically connected to a positive pole of a load, and no less than two switching circuits connected in parallel with each other; the switching circuit includes a positive input terminal electrically connected to a positive pole of common negative power supplies, a supplementary diode cluster composed of no less than one diode connected in series, and a thyristor connected between the positive input terminal and the positive output terminal; the positive input terminal is electrically connected to an anode of the supplementary diode cluster and an anode of the thyristor, and the positive output terminal is electrically connected to a cathode of the complementary diode cluster and a cathode of the thyristor.