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EN1HF1 Datasheet(PDF) 8 Page - Vicor Corporation |
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EN1HF1 Datasheet(HTML) 8 Page - Vicor Corporation |
8 / 13 page ENMODS™ Rev 3.1 vicorpower.com Page 8 of 13 06/2015 800 927.9474 EN1xxx APPLICATION NOTE (CONT.) Off-Line Power Supply Configuration The ENMod system maintains the DC output bus voltage between 250 and 370 Vdc over the entire input voltage range, which is compatible with all Vicor 300 V input converters. Autoranging automatically switches to the proper bridge or doubler mode at startup depending on the input voltage, eliminating the possibility of damage due to improper line connection. The ENMod system is rated at 575 W output power. 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. FARM3 Module Pin Descriptions (see Figures 1a, 18a and 18b) 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) for proper (autoranging) operation. Varistors V1 and V2 provide capacitor protection. The bleeder resistors (R1, R2) discharge the hold-up capacitors when power is switched off. Capacitors C7 and C8 are recommended if the hold-up capacitors are located more than 3 inches (75mm) from the output pins. Enable (EN) Pin. 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 are being charged through the 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 15 V through a 150 kΩ resistor. (see Figure 11) 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 (15 V) with respect to the SR 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 400 Vdc. The thermistor bypass switch opens if this condition occurs, placing the thermistor in series with the input voltage, reducing 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 180 Vdc. (see Figure 9) CAUTION: There is no input to output isolation in the ENMods, hence the –Out of the ENMods and thus the –In of the downstream DC-DC converter(s) are at a high potential. If it is necessary to provide an external enable / disable function by controlling the DC-DC converter’s PC pin (referenced to the –In) of the converter an opto-isolator or isolated relay should be employed. Bus-OK (BOK) Pin. (see Figure 12) The Bus-OK pin is intended to provide early-warning power fail information and is also referenced to the SR pin. CAUTION: There is no input to output isolation in the ENMods. It is necessary to monitor Bus-OK via an optoisolator if it is to be used on the secondary (output) side of the converters. A line isolation transformer should be used when performing scope measurements. Scope probes should never be applied simultaneously to the input and output as this will destroy the unit. L, N Pins. Line and neutral input. +, – Pins. Positive and negative outputs. SR Pin. Signal return for BOK and EN outputs. MiniHAM Module Pin (see Figures 1a, 18a, and 18b) Filter (see Figure 1b) The input EMI filter consists of differential and common mode chokes,Y– rated capacitors (line-ground) and X– rated capacitors (line-line). This filter configuration provides sufficient common mode and differential mode insertion loss in the frequency range between 100 kHz and 30 MHz to comply with the Level B conducted emissions limit, as illustrated in Figures 8a thru 8c. |
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