Supercapacitor selector worksheet 1. 2. 3. 4. 5. 6. 7. 8. 9. System power requirement: Maximum system voltage (Vm) Normal system operating voltage (Vw) Minimum voltage system will operate at (Vn) Amount of time capacitor will need to supply system (dt) Systems maximum current (Im) = line1/ line 4 Systems minimum current (In) = line1/ line 2 Average system current (Is) = (line 6+line 7)/2 Maximum Voltage drop to allow system to Function dv= line 3-line 4 ________ ________ ________ ________ Watts VDC VDC VDC ________ ________ ________ ________ Seconds Amps Amps Amps ________ Volts 10. Calculate Capacitance needed to meet system requirements Ct= (line 8* line 5/line 9) ________ Farads 11. Enter voltage rating of capacitor (2.3, 2.5,2.7, 5.4) Volts ________ 12. Number of capacitors connected in series to meet system voltage #S=line 2/ line 11 ________ Capacitors 13. Parallel capacitance needed (line 10*line 12) 14. Select a supercapacitor Part number ________ Farads ________________ 15. Selected supercapacitor capacitance value(Cc) ________ Farads 16. # of capacitors in parallel line 10*line 12/line 15 This value must by rounded to a whole number ________ Capacitors 17. Actual system capacitance Ct=line 15*line 16/line 12 ________ 18. ESR of selected supercapacitor ESR( DC) ________ Farads Ohms 19. System Resistance Rt=line 18*line 12/line 16 20. Updated system du=line 8*((line 5/line 17)+line 19) Ohms Volts ________ ________ Is Line 20< line 9 if no, select another capacitor. If yes good capacitor selected. 3757 W. Touhy Ave., Lincolnwood, Il 60712 ● (847)675-1760● Fax (847) 675-2850 ● www.illcap.com