Inrush current of the connector

Speaker: Vamsi Connector | Duration ca. 34 min incl. Q&A

All resistors carrying current generate heat, a phenomenon known as the Joule effect. From a thermal perspective, a power connector can be accurately modeled as a simple resistor. The working current of a power connector is typically defined by industry standards, such as UL 1059 in our case, which specifies a maximum temperature rise (∆T) of 30 K (Kelvin is used for temperature difference, while Celsius is for absolute temperature). This implies that at its full working current, the connector's internal temperature will not exceed 30 K above the ambient temperature. The combined temperature rise and ambient temperature are further limited by the maximum operating temperature rating, ensuring connector durability when used with the proper de-rating curve (refer to ANE006 for more details on de-rating). However, certain applications, like the short acceleration phase of an electric scooter, the transition phase of an electric transformer, or capacitance discharge in a lighting ballast, demand a high current for only a brief duration.

This presentation will address a crucial question for designers:
Do we have to oversize the connector working current to accommodate this inrush current, or is it permissible to temporarily exceed the specified working current for short periods?
Detailed insights into the thermal behavior of connectors under dynamic, high-current pulses.
Guidelines and recommendations for optimizing connector selection in applications with transient overload conditions.

#InrushCurrent
#PowerConnectors
#ThermalManagement

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Timestamps:
00:08 Introduction
00:50 Presentation
27:20 Questions and Answers