Ac-Dc Power Supplies Ranging from 2 W to 600 W

CUI’s extensive line of embedded ac-dc power supplies is available in board mount, chassis mount, and DIN rail configurations. Our line of products is developed to meet a broad range of needs across most major markets and applications. Featuring universal input voltage ranges and a host of features, our ac-dc power supplies are rugged, efficient, and convenient. With your power needs as our focus, we are here to support you through your design process.

Internal Ac-Dc FAQ

1.  How is a 2 vs 3 conductor power cord connected to an internal ac-dc power supply?

Most internal ac-dc power supplies are IEC Class I (see Class I vs Class II) and thus use 3-conductor ac input power (line, neutral, and ground). The ac input terminals may be labeled L and N. The input ground conductor may be connected to a third input terminal or it may be connected to an appropriately marked mounting screw. Some internal ac-dc power supplies are IEC Class II and thus will use only the two ac input conductors and will not have a provision for connecting an input ground conductor.

2.  What is the purpose of the fan and aux outputs on an internal power supply?

The fan voltage is used to provide power for a fan external to the power supply. This voltage normally not well characterized and may be switched on and off with the main output of the power supply. The AUX voltage is to provide power to housekeeping circuits which need to be on whenever the power supply is receiving external ac power.

3.  How are airflow, LFM, and CFM related?

LFM (Linear Feet per Minute) and CFM (Cubic Feet per Minute) are both measures of airflow in the context of power supplies. The value for CFM is calculated by multiplying the LFM value by the area through which the airflow is measured.

4.  What are the differences between open frame, u-frame, and enclosed power supplies?

Open frame, u-frame, and enclosed power supplies are all versions of chassis mounted internal power supplies. An open frame power supply may have a base plate, but the sides and top are open. A u-frame power supply has the base plate wrapped around two of the opposite sides. An enclosed power supply has the metal chassis covering the top, bottom, and at least two sides of the power supply.