title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

AC-DC Power Supplies Medical TypeGHA700FInstruction Manual1 Function1.1 Input voltage range!The range is from 85VAC to 264VAC.In cases that conform with safety standard, input voltage range is100VAC to 240VAC (50/60Hz).!If input value doesn’t fall within above range, a unit may not operatein accordance with specifi cations and/or start humting or fail.If you need to apply a square waveform input voltage, which iscommonly used in UPS and inverters, please contact us.!When the input voltage changes suddenly, the output voltage accuracymight exceed the specifi cation. Please contact us.1.2 Inrush current limiting!An inrush current limiting circuit is built-in.!If you need to use a switch on the input side, please select onethat can withstand an input inrush current.!Thermistor is used in the inrush current limiting circuit. When youturn the power ON/OFF repeatedly within a short period of time,please have enough intervals so that a power supply cools downbefore being turned on.!Surge current in the fi lter unit does not include. (0.2ms or less).1.3 Overcurrent protection!An overcurrent protection circuit is built-in and activated over105% of the rated current. A unit automatically recovers when afault condition is removed.Please do not use a unit in short circuit and/or under an overcurrentcondition.!Hiccup Operation ModeWhen the output voltage drops at overcurrent, the average outputcurrent is reduced by hiccup operation of power supply.! When the overcurrent protection continues, the output will be shutdown.! Output voltage recovers from overcurrent protection by shuttingdown the input voltage and waiting more than 3 minutes then turningon AC input again.1.5 Thermal protection!Over Temperature Protection (OTP) is built in.!If this function is in operation, turn off power, eliminate all possiblecauses of overheating, and drop the temperature to nomal level.Output voltage recovers after applying input voltage.The recovery time varies depending on input voltage and loadcondition.1 Over rated temperature2 Poor ventilation3 Over loadRemarks :Please comply with recommended mounting method in section 3.1.6 Output voltage adjustment range!To increase an output voltage, turn a built-in potentiometeris clockwise.To decrease the output voltage, turn it counterclockwise1.7 Output ripple and ripple noise!Output ripple noise may be infl uenced by measurement environment,measuring method Fig.1.1 is recommended.+Vout-VoutOsiloscope/Ripple noise meterBw:20MHzC1C2150mmC1 : Film capacitor 0.1μFC2 : Aluminum electrolytic capacitor 22μF+LoadDifferential probeFig.1.1 Measuring method of Ripple and Ripple NoiseRemarks :When GND cable of probe with fl ux of magnetic force from powersupply are crossing, ripple and ripple noise might not measurecorrectly.Please note the measuring environment.1.4 Overvoltage protection!An overvoltage protection circuit is built-in. If the overvoltage protectioncircuit is activated, shut down the input voltage, wait morethan 3 minutes and turn on the AC input again to recover the outputvoltage. Recovery time varies depending on such factors asinput voltage value at the time of the operation.Remarks :Please avoid applying a voltage exceeding the rated voltage to anoutput terminal. Doing so may cause a power supply to malfunctionor fail. If you cannot avoid doing so, for example, if you needto operate a motor, etc., please install an external diode on theoutput terminal to protect the unit.Bad exampleGood exampleFig.1.2 Example of measuring output ripple and ripple noiseGHA-24