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ESZ336M200AH4AA 数据表(PDF) 11 Page - Kemet Corporation |
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ESZ336M200AH4AA 数据表(HTML) 11 Page - Kemet Corporation |
11 / 19 page 11 © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com A4062_ESZ • 1/27/2017 Single-Ended Aluminum Electrolytic Capacitors – ESZ Series, +105°C Impedance (Z) Impedance of an electrolytic capacitor results from a circuit formed by the following individual equivalent series components: Equivalent Capacitance C o R e L C e C o R e L C e C o = Aluminum oxide capacitance (surface and thickness of the dielectric) R e = Resistance of electrolyte and paper mixture (other resistances not depending on the frequency are not considered: tabs, plates, etc.) C e = Electrolyte soaked paper capacitance L = Inductive reactance of the capacitor winding and terminals Impedance of an electrolytic capacitor is not a constant quantity that retains its value under all conditions; it changes depending on frequency and temperature. Impedance as a function of frequency (sinusoidal waveform) for a certain temperature can be represented as follows: C o R e L C e 0.1 1 10 100 1,000 10,000 0.1 1 10 100 1,000 Z [ohm] F [K Hz] B C A 1/ω ω ω ω C o R e 1/ω ω ω ω C e ωL • Capacitive reactance predominates at low frequencies • With increasing frequency, capacitive reactance Xc = 1/ωC o decreases until it reaches the order of magnitude of electrolyte resistance R e(A) • At even higher frequencies, resistance of the electrolyte predominates: Z = R e (A - B) • When the capacitor’s resonance frequency is reached (ω 0), capacitive and inductive reactance mutually cancel each other 1/ωC e = ωL, ω0 = C√1/LCe • Above this frequency, inductive reactance of the winding and its terminals (XL = Z = ωL) becomes effective and leads to an increase in impedance Generally speaking, it can be estimated that C e ≈ 0.01 Co. |
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