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EN1HF1 Datasheet(PDF) 7 Page - Vicor Corporation |
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EN1HF1 Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 13 page ENMODS™ Rev 3.1 vicorpower.com Page 7 of 13 06/2015 800 927.9474 EN1xxx The ENMod component power front-end system for EN compliance provides an effective solution for an AC front end of a power supply enabled with Vicor DC-DC converters. The ENMod system’s basic building blocks are the MiniHAM passive harmonic attenuation module, the FARM3 autoranging AC-DC front-end module (Figure 9) and a discrete EMI filter. The ENMod system provides transient/surge immunity, harmonic current attenuation and EMI filtering, in addition to all of the power switching and control circuitry necessary for autoranging rectification, inrush current limiting, and overvoltage protection. Converter enable and status functions for orderly power up/down control or sequencing are also provided. To complete the AC front-end configuration, the user only needs to add hold-up capacitors, a simple EMI filter, and a few discrete components (see Fig. 1a). Functional Description (FARM3, see Figures 9 & 10) Power-Up Sequence. Upon application of input power, the hold-up capacitors begin to charge. The thermistor limits the charge current, and the exponential time constant is determined by the hold-up capacitor value and the thermistor cold resistance. The slope (dV/dt) of the capacitor voltage versus time approaches zero as the capacitors become charged to the peak of the AC line voltage. The switch that bypasses the inrush limiting PTC (positive temperature coefficient) thermistor is open when power is applied, as is the switch that engages the strap for voltage doubling. In addition, the converter modules are disabled via the Enable (EN) line, and Bus- OK (BOK) is high. If the bus voltage is less than 200 V as the slope nears zero, the voltage doubler is activated, and the bus voltage climbs exponentially to twice the peak line voltage. If the bus voltage is greater than 200 V, the doubler is not activated. If the bus voltage is greater than 235 V as the slope approaches zero, the inrush limiting thermistor is bypassed. Below 235 V, it is not bypassed. The converters are enabled ~150 milliseconds after the thermistor bypass switch is closed. Bus-OK is asserted after an additional ~150 millisecond delay to allow the converter outputs to settle within specification. Power-Down Sequence. When input power is turned off or fails, the following sequence occurs as the bus voltage decays: Bus-OK is deasserted when the bus voltage falls below 210 Vdc. The converters are disabled when the bus voltage falls below 190 Vdc. If power is reapplied after the converters are disabled, the entire power-up sequence is repeated. If a momentary power interruption occurs and power is reestablished before the bus reaches the disable threshold, the power-up sequence is not repeated, i.e., the power conversion system “rides through” the momentary interruption. APPLICATION NOTE Microcontroller N L PTC Thermistor +OUT –OUT Strap EN BOK Strap SR EMI Filter EMI GND 400 300 200 100 0 90–132 V AC Line Output Bus (Vdc) Strap PTC Thermistor Bypass Converter Enable Bus OK ~150 ms Power Up Power Down 4.1 1.1 2.1 3.1 5.1 2.2 1.2 ~150 ms Figure 9 — Functional block diagram: FARM3 module Figure 10 — Timing diagram: power-up/down sequence 1.1 2.1 3.1 4.1 5.1 1.2 2.2 |
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Similar Description - EN1HF1 |
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