Power Connector Contact Sequence to Prevent Inrush Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inrush currents during the connection of power supply apparatus and electrical devices can cause damage to internal components, as existing suppression methods are inadequate in preventing these sudden surges.
Innovation Solution
The electrical connection protection system features a design where the negative pole terminals contact each other before the positive pole terminals, preventing inrush currents by ensuring the negative pole terminals have a greater height than the positive pole terminals, thus establishing a connection that suppresses inrush currents and protects signal terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery apparatus is plugged into the battery apparatus connection port, then electrical connection is established, but inrush current arises causing shock to the motor and potential damage to internal components
Solution Approach 1:
The patent applies preliminary action by designing the negative pole terminal to contact first before the positive pole terminal during connection. This preliminary contact sequence establishes a reference potential before power flow begins, preventing inrush current from causing motor shock or component damage. The height difference between negative and positive terminals ensures this predetermined contact order is achieved automatically during plugging operation.
2Reliability
If suppression components like resistors or NTC thermistors are added to the circuit board, then inrush current is suppressed, but device complexity increases
Solution Approach 1:
The patent extracts the inrush current suppression function from the circuit board and relocates it to the connection port structure itself. By designing the terminal contact sequence (negative pole first, then positive pole) at the connection interface, the need for additional suppression components on the circuit board is eliminated. This structural solution at the connection port reduces device complexity while maintaining reliable inrush current protection.
3Reliability
If the negative pole terminal has greater height than the positive pole terminal, then negative pole contacts first preventing inrush current, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies asymmetry by designing the negative pole terminal with greater height than the positive pole terminal. This asymmetric structure ensures that during connection, the negative pole makes contact first, establishing a reference potential before the positive pole contacts. The asymmetric height difference is a deliberate design feature that controls the connection sequence to prevent inrush current, transforming a precision challenge into a functional solution.
Data Source
AI summary
The present invention relates to the technical field of electrical connection protection, disclosing an electrical connection protection system, an electrical protection connecting head, an electrical device and a power supply apparatus. The electrical connection protection system comprises a first connection end for a power supply apparatus and a second connection end for an electrical device, the first connection end and the second connection end respectively comprising positive pole terminals capable of contacting each other to establish an electrical connection and negative pole terminals capable of contacting each other to establish an electrical connection, wherein when the first connection end and the second connection end are connected, the negative pole terminals of the first connection end and the second connection end contact each other before the positive pole terminals of the first connection end and the second connection end. Thus, an inrush current can be prevented from arising at the instant when the power supply apparatus and the electric device are connected, in order to prevent damage to internal electrical components of the electrical device and the power supply apparatus.