Self-Passivating Connectors for AC Transfer Without Polarity Reversal
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Solution Overview
Problem
Electrical connectors made from self-passivating transition metals are unsuitable for applications with rapid polarity reversal due to the slow formation of non-conductive passivation layers, which cannot keep up with high-frequency alternating current.
Innovation Solution
Transforming alternating current into a constant-polarity or pulsed voltage signal to prevent polarity reversal across self-passivating contacts, using an AC deconstruction circuit to convert AC into a constant-polarity signal and an AC reconstruction circuit to convert it back, ensuring no polarity reversal occurs during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-passivating transition metal contacts are used in electrical connector assemblies, then current leakage is minimized and short circuits are prevented through formation of non-conductive passivation layers, but the contacts cannot tolerate rapid polarity reversal when alternating current of sufficiently high frequency is applied
Solution Approach 1:
The patent introduces an intermediary conversion system consisting of an AC-to-DC converter and a DC-to-AC converter. The AC-to-DC converter transforms the alternating current into direct current before it reaches the self-passivating contacts, and the DC-to-AC converter transforms it back after passing through the contacts. This intermediary conversion process allows the contacts to operate under DC conditions where their passivation layers remain stable, while still enabling AC power transfer at the system level.
2Productivity
If alternating current is applied directly to self-passivating contacts, then AC power transfer is achieved, but the slow formation of passivation layers cannot keep up with rapid polarity reversal
Solution Approach 1:
The patent applies preliminary action by converting AC to DC before the current reaches the self-passivating contacts. This preliminary conversion ensures that the contacts are always subjected to unidirectional current flow, allowing the passivation layers to form and maintain their insulating properties without being disrupted by rapid polarity reversals. The AC-to-DC converter performs this preliminary transformation, creating favorable operating conditions for the contacts.
Solution Approach 2:
The patent changes the electrical parameter of the current from alternating current to direct current at the point where it contacts the self-passivating contacts. This parameter change transforms the operating conditions from those that would cause passivation layer breakdown (rapid polarity reversal) to those that maintain stable passivation (unidirectional current flow). The AC-to-DC converter and DC-to-AC converter together enable this parameter transformation while maintaining AC power transfer capability at the system level.
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
Enables the use of self-passivating contacts in applications with rapid polarity reversal by maintaining a stable non-conductive passivation layer, reducing current leakage and preventing short circuits, thus allowing AC power transfer in electrolytic environments.
Implementation Method 1
electrical contacts made from a self-passivating transition metal, which forms a non-conductive passivation layer on surfaces of the positive contact when the contact is exposed to water or other electrolytes
Data Source
AI summary
Methods and systems to transform an alternating current into constant-polarity constant or pulsed voltages, provide these to a first group of contacts of an electrical connector assembly such that none of the contacts is subjected to polarity reversal, receive the constant-polarity constant or pulsed voltages from a second group of contacts of the electrical connector assembly, and reconstruct the alternating current from these voltages.