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FARM1TN1 Datasheet(PDF) 6 Page - Vicor Corporation |
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FARM1TN1 Datasheet(HTML) 6 Page - Vicor Corporation |
6 / 12 page Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 FARM, Filter/Autoranging Rectifier Module Rev. 4.7 Page 6 of 12 Set your site on VICOR at www.vicorpower.com PRELIMINARY Figure 9—Converter connections Application Note (continued) Off-Line Power Supply Configuration The FARM maintains the DC output bus voltage between 250 and 370Vdc over the entire input voltage range, which is compatible with Vicor 2nd Generation, 300V input converters as well as 1st Generation VI-26x and VI-J6x DC-DC converters. The FARM automatically switches to the proper bridge or doubler mode depending on the input voltage, eliminating the possibility of damage due to improper line connection. The FARM1xxx is rated at 500W in the low range (90-132Vac input), and 750W in the high range (180-264Vac input). The FARM2xxx is rated for 750W and 1000W for the low and high input ranges respectively. Either of these modules can serve as the AC front end for any number and combination of compatible converters as long as the maximum power rating is not exceeded. Strap (ST) Pin. In addition to input and output power pin connections, it is necessary to connect the Strap pin to the center junction of the series hold-up capacitors (C1, C2, see Fig. 9) for proper (autoranging) operation. Gas tubes V1 and V2 provide capacitor protection. The bleeder resistors (R1, R2, see Fig. 9) discharge the hold-up capacitors when power is switched off. Capacitors C7 and C8 are recommended if the holdup capacitors are located more than 3 inches from the FARM output pins. Enable (EN) Pin. (see Fig. 10) The Enable pin must be connected to the PC or Gate-In pin of all converter modules to disable the converters during power-up. Otherwise, the converters would attempt to start while the hold-up capacitors were being charged through an unbypassed current limiting thermistor, preventing the bus voltage from reaching the thermistor bypass threshold, thus disabling the power supply. The Enable output (the drain of an N channel MOSFET) is internally pulled up to 15V through a 150k Ω resistor. A signal diode should be placed close to and in series with the PC or (Gate-In) pin of each converter to eliminate the possibility of control interference between converters. The Enable pin switches to the high state (15V) with respect to the negative output power pin to turn on the converters after the power-up inrush is over. The Enable function also provides input overvoltage protection for the converters by turning off the converters if the DC bus voltage exceeds 400Vdc. The thermistor bypass switch opens if this condition occurs, placing the thermistor in series with the input voltage, which reduces the bus voltage to a safe level while limiting input current in case the varistors conduct. The thermistor bypass switch also opens if a fault or overload reduces the bus voltage to less than 180Vdc. +In PC (Gate In) PR (Gate Out) –In +In PC (Gate In) PR (Gate Out) –In Vicor DC-DC Converter R1 R2 C1 C2 V1 V2 D2 D1 C3 C5 C4 C6 F1 F2 Vicor DC-DC Converter To additional modules C7* C8* Part C1,2 C3–6 R1,2 V1,2 F1,2 D1,2 C7,8 Z1 C9 D3,D4 C10,C11 R3 Description Holdup capacitors 4700pF 150kΩ, 0.5W 200V MOV 3A, PC Tron Diode Film Cap., 0.8µf MOV 0.47µF 1N5817 .001µF 500Ω Vicor Part Number see text 01000 00127-1503 20461-200 02178 00670 03040 26108 Sizing PCB traces: All traces shown in bold carry significant current and should be sized accordingly. FARM1-xxx N/ST/L +/– In 10A rms at 90Vac and 500W 4A DC at 190Vdc and 750W Required if C1 & C2 are located more than 3 inches from output of FARM. * * Holdup Box (HUB) 820µF HUB820-S 2200µF HUB2200-S 1200µF HUB1200-S 2700µF HUB2700-S 1800µF HUB1800-S 3300µF HUB3300-S 20A rms at 90Vac and 750W 8A DC at 190Vdc and 1000W FARM2-xxx N/ST/L +/– In FARM Filter/Autoranging Rectifier Module N EMI GND N/C L + B OK ST EN – Z1 C9 L PE N R3 D4 C11 C10 D3 |
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