title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

AC-DC Power Supplies Medical TypeInstruction Manual1 Functions150mm1.1 Input Voltage Range■The range is from 85VAC to 264VACIn cases that conform with safety standard, input voltage range is100VAC to 240VAC (50/60Hz).■If the input voltage is outside the rated range, the power supply mymalfunction. Operate in accordance within in the specifications.■If the input voltage changes suddenly, the output voltage may gooutside the specifications. Consult us for more details.OscilloscopeBw:20MHz+Vout-VoutRCC022μF+1.5m 50WCoaxial cableR=50WC=0.01μFMeasuringboardC10.1μFLoad●UMA30F, UMA60F■Power factor correction is not built-in.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.Fig.1.1 Measuring method of Ripple NoiseRemarks :When GND cable of probe with flux of magnetic force from powersupply are crossing, ripple noise might not be measured correclty.Please note the measuring environment.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■An overvoltage protection circuit is built-in. If the overvoltageprotection circuit is activated, shut down the input voltage, waitmore than 3 minutes and turn on the AC input again to recoverthe output voltage. Recovery time varies depending on such factorsas input voltage value at the time of the operation.Remarks : Please avoid applying a voltage exceeding the ratedvoltage to an output terminal. Doing so may cause a powersupply to malfunction or fail. If you cannot avoid doing so, forexample, if you need to operate a motor, etc., please install anexternal diode on the output terminal to protect the unit.1.5 Output Ripple Noise■The specified ripple noise are measured by the method introducedin Fig.1.1.■Capacitors C0 and C1 should be hybrid electrolytic capacitors,ceramic capacitors, or other capacitors with good high frequencycharacteristics.Bad exampleGood exampleFig.1.2. Example of measuring output ripple noise1.6 Output Voltage Adjustment Range■Adjustment of output voltage is possible by using option“-Y”.Please refer to instruction manual 5.1.1.7 Isolation■For a receiving inspection, such as Hi-Pot test, gradually increase(decrease) the voltage for the start (shut down). Avoid using Hi-Pot tester with the timer because it may generate voltage a fewtimes higher than the applied voltage, at ON/OFF of a timer.1.8 Low Power Consumption■The power supplies are designed for low power consumption atno load.■When the load factor is low, the switching power loss is reducedby burst operation, which will cause ripple noise to go beyondthe specifications.■Ripple noise during burst operation will change depending onthe input voltage and the output current. Consult us for adviceon how to reduce ripple noise.■When there is a need to measure the stand-by power consumption,measure it by using the average mode of the tester. The measuring environmentmay influence the result. Consult us for more details.UMA-12July 14, 2025