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FARM2TN2 Datasheet(PDF) 9 Page - Vicor Corporation |
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FARM2TN2 Datasheet(HTML) 9 Page - Vicor Corporation |
9 / 12 page Set your site on VICOR at www.vicorpower.com PRELIMINARY Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 FARM, Filter/Autoranging Rectifier Module Rev. 4.7 Page 9 of 12 Output Voltage 40 45 50 55 60 65 70 75 80 50 30 15 5 2 Figure 17—Converter ripple rejection vs. output voltage Determining Ride-through Time. Figure 15 illustrates ride- through time as a function of line voltage and output power, and shows that at a nominal line of 90Vac, ride-through would be 68 ms. Ride-through time is a function of line voltage. Determining Ripple Voltage on the Hold-up Capacitors. Figure 16 is used to determine ripple voltage as a function of operating power and bus capacitance, and shows that the ripple voltage across the hold-up capacitors will be 12V p-p. Determining the Ripple on the Output of the DC-DC Converter. Figure 17 is used to determine the ripple rejection of the DC-DC converter and indicates a ripple rejection of approximately 60 dB for a 12V output. Since the ripple on the bus voltage is 12Vac and the ripple rejection of the converter is 60 dB, the output ripple of the converter due to ripple on its input (primarily 120 Hz) will be 12mV p-p. Note that 2nd Generation converters have greater ripple rejection then either VI-200s or VI-J00s. For more information about designing an autoranging AC input power supply using the FARM and Vicor DC-DC converter modules, contact Vicor Applications Engineering at the nearest Vicor Technical Support Center, or send E-mail to apps@vicr.com. • • • Another consideration in hold-up capacitor selection is their ripple current rating. The capacitors’ rating must be higher than the maximum operating ripple current. The approximate operating ripple current (rms) is given by: I rms = 2P/Vac (7) Where: P = total output power Vac = operating line voltage Calculated values of bus capacitance for various hold-up time, ride-through time, and ripple voltage requirements are given as a function of operating power level in Figures 14, 15, and 16, respectively. Example In this example, the output required from the DC-DC converter at the point of load is 12Vdc at 320W. Therefore, the output power from the FARM would be 375W (assuming a converter efficiency of 85%). The desired hold-up time is 9 ms over an input range of 90 to 264Vac. Determining Required Capacitance for Power Fail Warning. Figure 14 is used to determine capacitance for a given power fail warning time and power level, and shows that the total bus capacitance must be at least 820 µF. Since two capacitors are used in series, each capacitor must be at least 1,640 µF. Note that warning time is not dependent on line voltage. A hold-up capacitor calculator is available on the Vicor website, at vicorpower.com. Application Note (continued) |
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