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SCRN229R-F Datasheet(PDF) 3 Page - Cornell Dubilier Electronics |
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SCRN229R-F Datasheet(HTML) 3 Page - Cornell Dubilier Electronics |
3 / 3 page Type SCR Commutating Capacitors CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com How to Choose a Commutating Capacitor 1. From circuit analysis or measurement, determine application values for these six parameters: Nominal capacitance in µF Current pulse width in µs Current pulse period in µs Maximum peak voltage Continuous AC voltage in Vrms Maximum volt-amps (VA) 2. Choose a capacitor from the ratings table of the desired nominal capacitance with a peak voltage rating no less than your maximum peak voltage. 3. Check that your application’s rms current is no more than the capacitor’s Max. Amps RMS. You can calculate the current from your Vrms using the equations in the following section. 4. Check that your application’s volt-amperes is not more than the capacitor’s VA capability. The VA capability is the max VA rating times the Volt-Ampere multiplier from Figure 2 (Current Pulse Width) and that times the Volt-Ampere Multiplier from Figure 3 (Ambient Temperature). See the following section for more on using volt-ampere multipliers . If you need a greater VA capability, repeat these steps for a higher peak voltage capacitor or consider connecting units in parallel to divide the VA required. For up to peak voltage of 600 V, you may also consider polypropylene film dielectric units, Catalog Numbers SCRN262R through SCRN266R, with higher VA capability. Using Volt-Ampere Ratings The capacitors maximum VA rating is the maximum product of the sine wave voltage and current that may be applied at 65 ºC without overheating the capacitor and reducing its expected life. For other temperatures and pulsed current, use the multipliers of Figures 2 and 3 to derate the Max VA rating. The Max Amps RMS rating is set by the capability of the capacitor terminals. Exceeding this limit can damage the terminals and cause capacitor failure. Calculate the capacitor’s actual VA load as the product of the rms voltage across the capacitor and the rms current through the capacitor. To calculate rms current for an applied sine wave or squarewave voltage, use these equations. For a sinewave voltage the current is: Irms = 2π fCVrmsX10-6 and for a squarewave the current is: Irms = C∆V/[0.64(tT)0.5] = Ipeak(t/T)0.5 where (f) is repetition frequency in Hz, C is nominal capacitance in µF, �V the peak-to-peak squarewave amplitude in volts, (t) is the pulse width in µs and T is the pulse period in µs. The peak current for the square wave voltage is: Ipeak = C∆V/0.64t Figure 1 Pulse Wave Applications Figure 2 Figure 3 Polypropylene PP Film/Paper Paper V peak ΔV Voltage I peak Current |
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