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FARM2C12 Datasheet(PDF) 8 Page - Vicor Corporation |
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FARM2C12 Datasheet(HTML) 8 Page - Vicor Corporation |
8 / 12 page Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 FARM, Filter/Autoranging Rectifier Module Rev. 4.7 Page 8 of 12 Set your site on VICOR at www.vicorpower.com PRELIMINARY * Operating Power (W) 0 5 10 15 20 25 30 35 40 2200µF 1600µF 1300µF 1000 750 500 250 1100µF 820µF 680µF * * (FARM2XXX) (FARM1XXX) Figure 14—Hold-up time vs. operating power and total bus capacitance, series combination of C1, C2 (see Fig. 9) Operating Power (W) 0 5 10 15 20 25 30 2200µF 1600µF 1300µF 1000 750 500 250 * 1100µF 820µF 680µF * * (FARM1XXX) (FARM2XXX) Figure 16—Ripple voltage vs. operating power and bus capacitance, series combination of C1, C2 (see Fig. 9) Operating Power (W) 0 10 20 30 40 50 60 70 80 90 100 90Vac 115Vac 1000 750 500 250 Total capacitance 820µF Figure 15—Ride-through time vs. operating power Figure 13—Hold-up time π – θθ 205V 185V Power Fail Power Fail Warning B OK Converter Shutdown Hold-up Time 254V Ride-Thru Time Ripple (V p-p) The power fail warning time ( ∆t) is defined as the interval between B OK and converter shutdown (EN) as illustrated in Fig. 13. The Bus-OK and Enable thresholds are 205V and 185V, respectively. A simplified relationship between hold-up time, operating power, and bus capacitance is obtained by inserting these constants: C = 2P ∆t / (205 2 – 1852) C = 2P ∆t / (7,800) It should be noted that the series combination (C1, C2, see Fig. 9) requires each capacitor to be twice the calculated value, but the required voltage rating of each capacitor is reduced to 200V. Allowable ripple voltage on the bus (or ripple current in the capacitors) may define the capacitance requirement. Consideration should be given to converter ripple rejection and resulting output ripple voltage. The ripple rejection (R) of Vicor converters is specified as a function of the input/output voltage ratio: R = 30 + 20log(Vin / Vout) (4) For example, a converter whose output is 15V and nominal input is 300V will provide 56dB ripple rejection, i.e., 10V p-p of input ripple will produce 15mV p-p of output ripple (see Fig. 17). Equation 3 is again used to determine the required capacitance. In this case, V1 and V2 are the instantaneous values of bus voltage at the peaks and valleys (see Fig. 13) of the ripple, respectively. The capacitors must hold up the bus voltage for the time interval ( ∆t) between peaks of the rectified line as given by: ∆t = (π – θ) / 2πf (5) Where: f = line frequency θ = rectifier conduction angle The approximate conduction angle is given by: θ = Cos -1 (V 2/V1) (6) Application Note (continued) |
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