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C20AKGR6100ZASK Datasheet(PDF) 5 Page - Kemet Corporation |
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C20AKGR6100ZASK Datasheet(HTML) 5 Page - Kemet Corporation |
5 / 8 page © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com F3050_C44P_RADIAL • 9/20/2016 5 Power and AC Film Capacitors – Aluminum Can Power Film Capacitors C44P/C20A Series, 250 – 1,000 VAC, 400 – 1,400 VDC, for PFC and AC Filter Lifetime Expectancy/Failure Quota Graphs Power Losses and Hot Spot Temperature Calculation At each frequency, the Power Losses are the sum of: 1. Dielectric Power Losses P D(fi) = 2 * π * fi* C * V(fi) 2 * tgδ 0 which can be alternatively calculated as P D(fi) = I(f i) 2 * tgδ 0 2 * π * f i* C where: tgδ 0 = 2 * 10 -4 2. Joule Power Losses: P J(fi) = Rs * I(fi) 2 The Total Power Losses are the sum of the components at each frequency: ( ) ( ) [ ] ∑ + = i i J i D T f P f P P The Thermal Jump in the Hot Spot is: ΔT HS = PT * Rth-hs The Hot Spot Temperature is: T HS = Ta + ΔTHS Limits for the formulas The limits listed below should not be exceeded: 1. 2. T HS = Ta + ΔTHS ≤ (THS )MAX Where T a is the ambient temperature (steady state temperature of the cooling air flowing around the capacitor, measured at 100 mm of distance from the capacitor and at a height of 2/3 height of the capacitor). 3. Maximum case temperature (T CASE) ≤ 70°C Example of calculation Part Number: C44PKGR6100AASJ Rated V RMS = 440 [VRMS] Rated I RMS = 30 [A] R s = 3.5 [mΩ] R th = 5.6 [°C/W] Fundamental Frequency F 1 = 50 [Hz] Ripple Frequency F 2 = 7000 [Hz] Fundamental Voltage V 1 = 440 [V~] Ripple Current I 2 = 27 [A] T a = 35°C I 1 = I(50) = 2 * π * 50 * 100 * 10 -6 * 440 = 13.8 [A] V 2 = V(7000) = [27/(2 * π * 7000 * 100 * 10 -6 )] = 6.14 [V] I RMS = √(13.8 2 + 272) = 30 ≤ 30 → Admitted V RMS = √(440 2 + 6.12) = 440 ≤ 440 → Admitted P D(50) = 2 * π * 50 * 100 * 10 -6 * 4402 * 2 * 10-4 = 1.22 [W] P D(7000) = [27 2 /(2 * π * 7000 * 100 * 10-6)] * 2 * 10-4 = 0.03 [W] P J(50) = 3.5 * 10 -3 * [(2 *π * 50 * 100 * 10-6 * 440)2] = 0.67 [W] P J(7000) = 3.5 * 10 -3 * 272 = 2.55 [W] P T = 1.22 + 0.03 + 0.67 + 2.55 = 4.47 [W] ΔT HS = 5.6 * 4.47 = 25 [°C] T HS = Ta + ΔTHS T HS = 35 + 25 = 60 [°C] →OK since hot spot temperature is less than maximum admitted Expected Life @ T HS = 75°C → 100,000 hours (see lifetime curve) Expected Life @ T HS = 60°C → 140,000 hours (see lifetime curve) RMS i i V f V ≤ ∑ 2 ) ( RMS i i I f I ≤ ∑ 2 ) ( V = Operating Voltage [VAC] V rms = Rated Voltage [VAC] 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 100 1,000 10,000 100,000 1,000,000 ≤60°C 70°C 75°C 80°C Lifetime curve C44P-C20 series Hot Spot Temperature °C Lifetime Expectancy [h] 1 10 100 1,000 0.6 0.7 0.8 0.9 1 1.1 Voltage Ratio V/Vrms FIT @ Hot Spot Temperatures 80 75 70 ≤60 Hot Spot Temperature °C |
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