Cosel is one of the world's leading power supply manufacturers offering
high-quality, ultra small size AC-DC power supplies,
DC-DC converters of the state-of-the-art technologies, and effective and
easy-to-use noise filters.

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Home>Technical Data>FAQ TECHNICAL DATA

Frequently Asked Questions


Operation principle and use notes

Input condition
Q What happen if high/low input frequency is applied?
Q What is harmful effect of input line impedance?
Q What is harmful effect of out of input voltage spec operation?
Q Is it possible to use UPS as input source?
Q Is it allowed to apply DC voltage to AC-DC unit?
Q What is meaning of (L) and (N) on AC terminal?
Q Is it possible to apply 400Hz input to AC-DC unit?
Load condition
Q How can pulse/peak current be drawn?
Q How to read derating curve?
Q Why does audible sound occur with pulse load?
Q What is influence of back electromotive force from motor on PSU?
Q Does rated power change when output voltage adjusted?
EMC
Q Where is noise sources and pathway in PSU?
Q Noise (Emission/EMI) type and How to reduce?
Q Noise (Immunity/EMS) type and How to protect?
Q What is EMI filter recommended for DC-DC converter?
Protection circuit
Q What is Inrush current protection?
Q How to protect DC-DC converter against reverse voltage?
Attached function
Q Show DC-DC converter application circuit?
Q How to use remote sensing in series/parallel connection?
Components, Others

Others
Q How to choose wiring cable?
Q How much is the tightening torque?
Q How to calculate calorific value?
Q What does the content indicated on name plate mean?
Q What action should be taken if internal fuse has blown out?
Reliability and Safety

Reliability
Q What is expected life of Electrolytic capacitor?
Q What is MTBF?
Q How long is expected life time in FAN built-in PSU?
Q How long is the storage limitation?
Q What is harmful effect of out of ambient temperature spec operation?

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