What are the protection forms of overload/overcurrent?

When current drawn exceeds the rating of the PSU, the protection circuit will be triggered to protect the unit against overload/overcurrent. 

Protections of overload/overcurrent can be divided into several forms:


Output current decreases about 20% of rated current, shown as curve (a) in the figure below. 


Output current remains at a constant level and within the specified range while the output voltage drops to a lower level, shown as curve (b) in the figure below. 


Output power remains constant. As output load increases, output voltage decreases in proportion, shown as curve (c) in the figure below.  


Output voltage and current keep pulsing ON and OFF repeatedly when protection is activated. The unit automatically recovers when the faulty condition is removed.


 Output voltage and current are cut off when output load reaches protection range. 

NOTE: Protection mode of some of the products combines with different types of the forms mentioned, such as constant current limiting + shut down.

Recover method:

(1)Auto Recovery: PSU recovers automatically after faulty condition is removed.

(2)Re-power on: PSU restarts by manual AC re-power on after faulty condition is removed.

Note: Please do not operate PSU in overcurrent or short-circuit condition for a long period of time to prevent a shorten lifespan or damaging the PSU.

Categories: Industrial, Medical, Operation
Tags: Constant Current Limiting, Foldback Current Limiting, Hiccup Current Limiting, Over Power Limiting, Overcurrent Protection, Overload Protection, Shut Off

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