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DFFHV46FT2637 Datasheet(PDF) 3 Page - AVX Corporation |
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DFFHV46FT2637 Datasheet(HTML) 3 Page - AVX Corporation |
3 / 13 page 57 092315 Medium Power Film Capacitors FFHV/FTHV 1500Vdc to 3000Vdc HOW TO CHOSE THE RIGHT CAPACITOR Time Uw Un Ur 1/f The capacitor lifetime depends on the working voltage and the hot spot temperature. Our caps are designed to meet 100000 hours lifetime at rated voltage and 70°C hot spot temperature. In accordance with operating conditions, please calculate the hot spot temperature and deduce from this calculation if the obtained lifetime can suit the application. 1. From the tables, select a capacitor with required capacitance Cn and voltage Un. Calculate the maximum ripple voltage allowed for the selected cap: Urmax = 0.2Un If Ur>Urmax, select a capacitor with higher rated voltage Make sure Irms application < Irms table Copy out: • serial resistance (Rs): see table of values • thermal resistances Rth1 and Rth2 (depending on cooling conditions) 2. Hot spot temperature calculation Total losses are calculated as follow: Pt=Pj+Pd Joule losses: Pj = Rs x Irms² Dielectric losses: Pd = Q x tg δ0 with • Q(reactive power) = Irms2 for a sinusoidal waveform ––––– C • tg δ0 = 2 x 10-4 (dielectric losses of polypropylene) Hot spot temperature will be: HS = amb + (Pj + Pd) x (Rth1 + Rth2) HS absolute maximum is 85°C If temperature is higher than 85°C, come back to #1 and start again with another selection. Rth1: thermal resistance between hot spot and case Rth2: thermal resistance between case and ambient air 3. Refer to the curve and deduce the lifetime vs Uw/Un ratio width HS CASE AMB Rth1 Rth2 eg: rated voltage 2000V working voltage 1900V ρ = 0.95 ⇒ lifetime 200,000 hours @ 70°C hot spot temperature Please, find a calculation form at the end of the catalog 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 100 1,000 10,000 100,000 200,000 0.95 1,000,000 Lifetime Expectancy (hours) θHS = 65ºC |
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