title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

AC-DC Power Supplies Enclosed TypeInstruction ManualWBA1 Functions1.1 Input Voltage Range■Power factor correction is not built-in.■If the input voltage is outside the rated range, the power supplymay malfunction operate in accordance with the specificationsand/or start hunting or fail.■If the input voltage changes suddenly, the output voltage may gooutside the specifications. Consult us for more details.■The range is from 170VAC to 305VACIn cases that conform with safety standard, input voltage range is200VAC to 277VAC (50/60Hz).■The power supply can work at the input voltage dip with the derating(Excluding WBA350B).Table 1.1 SEMI F47-0706 Maximum output load factorVoltage Dipduration[ms]WBA35BWBA75BWBA150B200VAC→100VAC200100%80%80%200VAC→140VAC500100%100%100%200VAC→160VAC1000100%100%100%1.2 Inrush Current Limiting■Inrush current protection is built-in.■If you need to use a switch on the input side, select one that canwithstand an input inrush current.■Thermistor is used in the inrush current limiting circuit. Whenyou turn the power supply on and off repeatedly, have enoughintervals for the power supply to cool down before being turnedon again.1.3 Overcurrent Protection■Overcurrent protection is built-in. It works at more than 105% ofthe rated output current. The power supply recovers automaticallywhen the overcurrent condition is removed. Do not use thepower supply under a short-circuit or overcurrent condition.■Hiccup Operation ModeWhen overcurrent protection works and the output voltage drops,the output voltage goes into Hiccup mode so that the averageoutput current can decrease.1.4 Overvoltage Protection●WBA35B WBA75B WBA150B■If the overvoltage protection circuit is activated, shut down the inputvoltage, wait at least 3 minutes and turn on the AC input again to recoverthe output voltage. Recovery time varies depending on suchfactors as input voltage value at the time of the operation.●WBA350B■The unit automatically recovers when the fault condition is removed.1.5 Thermal protection●WBA350B■Thermal protection is built-in.Thermal protection will work under the following conditions andthe power supply will shut down.1When the operating temperature and the output current greatlyexceed the derating curve.2When the built-in cooling fan stops or the air flow from the fanis obstructed.If thermal protection works, switch off the input voltage and eliminatethe conditions causing thermal protection to work. Allowenough time for the unit to cool off before switching on the inputvoltage again to recover the output voltage.1.6 Output Ripple Noise■Output ripple noise may be influenced by the measuring environment.The measuring method shown in Fig. 1.1 is recommended.Osiloscope/Ripple noise meterBw:20MHz+Vout-VoutC1150mmLoad???? Film capacitor 0.1?F?????Aluminum electrolytic capacitor 47?FFig 1.1 Measuring method of Ripple and Ripple NoiseFig.1.1 Measuring method of Ripple NoiseRemarks : When measuring output ripple noise with an oscilloscope,do not let the oscilloscope’s GND cable cross themagnetic flux from the power supply. Otherwise there may beelectrical potential generated on the GND cable and the measuringresult may not be accurate.C2+Differential probe■Overvoltage protection is built-in.Remarks : Please avoid applying a voltage exceeding the ratedvoltage to an output terminal. Doing so may cause a power supplyto malfunction or fail.If you cannot avoid doing so, for example, if you need to operatea motor, etc., please install an external diode on the output terminalto protect the unit.PowerSupplyProbeBad examplePowerSupply150mmDifferential probeGood exampleFig.1.2 Example of measuring output ripple noiseWBA-12May 09, 2025