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FARM2C13 Datasheet(PDF) 5 Page - Vicor Corporation |
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FARM2C13 Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 11 page FARM™ Rev 6.7 vicorpower.com Page 5 of 11 06/2015 800 927.9474 FARMxxxx The Filtered, Autoranging Rectifier Module (FARM) provides an effective solution for the AC frontend of a power supply built with Vicor DC-DC converters. This high-performance power system building block satisfies a broad spectrum of requirements and agency standards. In addition to providing transient/surge immunity and EMI filtering, the FARM contains all of the power switching and control circuitry necessary for autoranging rectification, inrush current limiting, and overvoltage protection. This module also provides converter enable and status functions for orderly power up/down control or sequencing. To complete the AC front-end configuration, the user only needs to add hold-up capacitors, and a few discrete components. Functional Description Initial Condition 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. (see Fig. 7). In addition, the converter modules are disabled via the Enable (EN) line, and Bus-OK (BOK) is high. Power Up Sequence. (see Fig. 8) : Upon application of input power, the output bus 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. 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. (see Fig. 8) When input power is turned off or fails, the following sequence occurs as the bus voltage decays: Bus-OK is de-asserted when the bus voltage falls below 205 Vdc (Typical). 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 re-established 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 EMI Filter EMI GRD 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 7 — Functional block diagram: autoranging rectifier Figure 8 — Timing diagram: power up/down sequence 1.1 2.1 3.1 4.1 5.1 1.2 2.2 |
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