If you have any questions on K-WELL's products, please read the FAQ first.If the listed answers still cannot solve your problems, please contract us immediately, we should reply to you as soon as received your request.
Contact us at : sales@kw-magnetics.com or support@kw-magnetics.com
As a dedicated manufacturer of magnetics components and power supplies,K-WELL provides a wide variety of power magnetic, EMC magnetic,external power adapters, battery chargers and open frame power supply unit to meet different demands from the markets. However, selecting the right products relies heavily on the correct electrical characteristics and specification,we listed the Frequently Asked Questions for your reference.
Q1How to choosing a switching power supply? |
Ans
1. To increase the reliability of the SMPS, we suggest users choose a unit that has a rating of 20% more power 2. We also need to consider about ambient temperature of the SMPS and whether there is additional device for 3. Choosing functions based on your application: ● Protection function: Over Voltage Protection , Over Temperature Protection ,Over Load Protection , and etc. ● Special function: Power Factor Correction (PFC), Uninterruptible Power Supply (UPS) function. |
Q2Why did the power supply shuts down during operation and after turning it off, I can restart the power supply again? |
Ans
In general there are two circumstances that will cause the power supply to shut down. The first one is the |
Q3What is "Inrush Current"? What will we notice? |
Ans
At input side, there will be (1/2 ~1 cycle, ex. 1/120 ~ 1/60 seconds for 60 Hz AC source) large pulse current |
Q4What is PFC? | ||||||||||||
Ans
Power Factor Correction or PFC is to improve the ratio of apparent power to real power. The power factor is
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Q5What is the difference between -V and COM which are marked on the output side? |
Ans
COM (COMMON) means common ground. Please see below: |
Q6What is power good and power fail signals and how can use it? |
Ans
Some power supplies provide a "Power Good" signal when they are turned on, and send out a " Power Fail" |
Q7What are the protection forms of overload/overcurrent? |
Ans
When current drawn exceeds the rating of the PSU, the protection circuit will be triggered to protect the unit |
Q8What is Ripple & Noise? How to measure it? |
Ans
It is the small unwanted residual periodic variation of the direct current (DC) output of a power supply which has |
Q9What is Withstand Voltage?How to measure it? |
Ans
Indicates Hi-Pot Test or Electric Strength Test. The input should be shorted together as well as the output before
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Q10How to find products you need in K-WELL website? |
Ans
1.Click “Products” on the website Menu. In products menu you can find two kinds products of power supply and magnetic componets.then you can choose you needs that enter the corresponding page. our part number rule :The English letter → indicates the product category,The number → indicates power range (power supply) or dimension(magnetic components). 2.You can download the product selection guide from our data download center and compare the product series Numbers with your requirements. 3.You can quickly search in our fast search bar by entering the product serial number. |