Technical guide PDF - Murata

More documents

Recommendations

Info

If you would like to provide the information requested for the conditionsbelow, Murata can make more detailed proposals based oncustomer-specific applications.Discharge condition of capacitorDischarge ConditionEDLC voltage1. Max charge voltageVMaxEarly voltage characteristic2. Allowable Min.voltageVminDischarging timeRequired charge (c)or Energy (J)Energy (J) =Power (W) x Discharging time t(sec)Charge (c) = Current (A) x Discharging time t(sec)ChargeconditionDischargeconditionUsageenvironmentCondition Example PurposeCharge voltage for 2.5V To confirm required number of cells incapacitorseries and consider discharge time.Charge voltage VmaxCharge current 500mA(in case of constantcurrent charge)Charge(C)orEnergy(J)Power × time(W x sec)orCurrent × time(A × sec)Numbers of discharge ona single chargeAccepted lower limit ofvoltage VminMinimum operationtemperatureActual usagetemperatureprofile150mJor300mC1.5W×100msecor3A×100msecNumbers of dischargeon a single charge( 5 times)1.3(V)To confirm required currentRegarding discharge effectiveness, itis necessary to consider max power orcurrent because it is affected by energyloss caused by internal resistanceTo calculate the discharging time.-20℃ At low temperature, dischargeeffectiveness decreases because ofESR increase.Under 40℃(typ)30000hrs70℃(Max)Under 500hrsOthers Loss on the circuit Effectiveness(%)orResistance(Ω)To confirm capacitance decrease andESR increase throughout the product lifeTo Confirm required capacitance。10
3. Cautions for use3-1. Voltage Resistance voltage of EDLCBy using an organic electrolyte, Murata’s EDLC provide high voltage. However, applying a highervoltage than rated voltage on EDLC may cause degradation. Please ensure not to apply excessivevoltage on EDLC.When using several EDLCs in series, voltage may become unbalanced and excessive voltage maybe applied. Therefore, consider applying enough voltage margin and balance control Series/Parallel useUse several capacitors in series according to required voltage. When discharging time needs to beincreased, please use several capacitors in parallel Voltage balanceWhen using capacitors in series, use balance resistance in parallel to the capacitor or use anactive balance circuit. For more details, see Murata’s specification sheetIf there are temperature gaps between capacitors, voltage will lose balance. Ensure that there is notemperature gap between capacitors. PolarityVerify the orientation of EDLC before use in accordance with the markings of polarity on theproducts. In principle, EDLC has no polarity. However, EDLC cannot be used under AC. Using EDLCunder AC condition may cause degradation and leakage3-2. Self HeatingPlease use EDLC under ensured temperature considering self heating of a capacitor. Please see ourspecification sheet for further details.3-3. Mounting conditionMurata’s EDLC product is non reflowable due to the internal chemical system.For mounting, please use solder iron or special connector. Please see our specification sheet forrecommended soldering3-4. Storage conditionPlease avoid storage at high temperature or high humidity. Please see our catalog or specificationsheet for further details.11
Page 1 and 2: Technical Guide of Electrical Doubl
Page 3 and 4: 1-3. Equivalent circuit of EDLCActi
Page 5 and 6: …2-2. Charge and discharge charac
Page 7 and 8: 2-3. Factors to consider in selecti
Page 9: [3] Degradation of capacitance and

Technical guide PDF - Murata

Create successful ePaper yourself

Delete template?

Save as template?