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Industry knowledge
Application differences between power supply spring terminal and signal spring terminal
06-21 / 2024

The respective characteristics of the power spring terminal and power connector




1. Definition of current carrying capacity (current magnitude) for power and signal spring terminals




The influence of temperature in power supply applications




Definition of rated current of connectors




Provisions on temperature rise of connectors in various testing standards




The controversy surrounding the allowable temperature rise of connectors




The impact of testing methods on the temperature rise of connectors




The impact of connector status on current carrying capacity testing




Three influencing factors for testing the current carrying capacity of connectors




(1) Overview of connector temperature rise




The balance between heat generation and heat dissipation in connectors




The generation of heat from connectors




There are three ways for connectors to dissipate heat




Thermal radiation




Heat convection




Heat conduction




(2) The generation of connector heat and body resistance




The specific resistance requirements for the power supply spring terminal and signal spring terminal




How to calculate the resistance of the spring terminal body




(3) The generation of heat in connectors and local superheat at interfaces




Resistance heat at the connector interface




How is the local ultra-high temperature generated at the connector interface




The calculation formula for local ultra-high temperature at the connector interface




The local ultra-high temperature characteristics of the connector interface




The harm of local ultra-high temperature at the connector interface




Continuous current and instantaneous current of 3 connectors




Continuous current; Instantaneous current; Overload current




The loading process of current




Determination of instantaneous current




The quantitative relationship between the instantaneous current of common coatings and the contact resistance of connectors




Quantitative relationship between connector overload current, overload time, and rated current




Design standards for power supply spring terminals




(1) Local ultra-high temperature standards




Four local ultra-high temperature standards




Source of local ultra-high temperature standards/curve relationship between local ultra-high temperature and contact voltage




(2) The relationship between local ultra-high temperature standards and contact resistance




The quantitative relationship between the separation interface, permanent connection interface, and contact resistance and current at the end of product life derived from local ultra-high temperature standards




Discussion on the quantitative relationship between the contact resistance of the power supply spring terminal and the current




(3) Consideration of the resistance of the spring terminal body




Reduce the resistance of the spring terminal body




How to choose copper (alloy) to reduce the resistance of spring terminal body and improve heat dissipation ability




Calculation of body resistance




(4) Consideration of connector contact resistance




How to reduce contact resistance through multi contact contact of power supply spring terminals




How to improve contact reliability of power supply spring terminal with multiple contacts




The multi contact contact of the power spring terminal enhances the insertion and extraction life




5. Distribution of current




(1) Dedicated power spring terminal




Size limit for dedicated power supply spring terminals




The connection requirements for dedicated power supply spring terminals have been increased




Simplified analysis of dedicated power supply spring terminals




The influence of the size of wire conductors on the rated current of connectors




The effect of environmental temperature on the rated current of connectors/derating current/derating curve




The effect of increasing the heat dissipation area on the rated current of the connector




(2) Parallel multi terminal applications




The advantages of parallel multi terminal applications




(3) Parallel connection


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