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VI-ARM-M22 Datasheet(PDF) 5 Page - Vicor Corporation |
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VI-ARM-M22 Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 12 page Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 ARM, Autoranging Rectifier Module Rev. 2.4 Page 5 of 12 Set your site on VICOR at www.vicorpower.com The VI-ARM Autoranging Rectifier Module (ARM) provides an effective solution for the AC front end 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. The ARM 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 needs only to add holdup capacitors and a suitable input filter with transient protection. Functional Description 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. 6). In addition, the converter modules are disabled via the Enable (EN) line, and Bus-OK (B OK) is high. Power-Up Sequence. (See Fig. 7).: 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 holdup capacitor value and the thermistor cold resistance. The slope (dv/dt) of the capacitor voltage approaches zero as the capacitors become charged to the peak of the AC line voltage. If the bus voltage is less than 200V 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 200V, the doubler is not activated. If the bus voltage is greater than 235V as the slope approaches zero, the inrush limiting thermistor is bypassed. Below 235V, the thermistor is not bypassed. The converters are enabled 50 milliseconds after the thermistor bypass switch is closed. Bus-OK is asserted after an additional 50 millisecond delay to allow the converter outputs to settle within specification. Power-Down Sequence. (See Fig. 7). 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 205Vdc (Typ.). The converters are disabled when the bus voltage falls below 200Vdc. 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. Application Note Microcontroller N L PTC Thermistor +Out –Out Strap EN BOK Strap 400 300 200 100 0 90–132V AC Line Output Bus (Vdc) Strap PTC Thermistor Bypass Converter Enable Bus OK 50ms 50ms Power Up Power Down 4.1 1.1 2.1 3.1 5.1 2.2 1.2 Figure 6—Functional block diagram Figure 7—Timing diagram: power up/down sequence 1.1 2.1 3.1 4.1 5.1 1.2 2.2 |
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