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參數(shù)資料
| 型號： | F3D480T20A |
| 廠商： | Vicor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VI Chip PFM Power Factor Module |
| 中文描述： | 六烤瓷芯片功率因數(shù)模塊 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 457K |
| 代理商： | F3D480T20A |
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
Power Factor Module
F3D480T20A
Rev. 1.0
Page 5 of 14
PRELIMINARY
The PFM power-processing module consists of two major functional
blocks: an Adaptive Voltage Transformation Module (VTM) that
interfaces directly to the rectified line followed by a microprocessor
controlled Post Regulator Module (PRM). In contrast to offline power
factor correction topologies, input current shaping and energy storage
are accomplished on the secondary side of the isolation boundary.
Adaptive VTM
The Adaptive VTM acts as a nearly ideal DC-to-DC transformer. It
accepts the rectified AC input from the power source, configures its
step down ratio, or K factor, based on the magnitude of the input
voltage, and produces an isolated DC output that instantaneously
tracks the input. The Adaptive VTM configures itself by paralleling
input cells in low voltage input mode or by series configuration of
input cells in high voltage input mode. Operating over the worldwide
AC mains, the Adaptive VTM reduces the voltage variation applied to
the PRM stage from 3 to1 to 1.5 to1. This reduction in voltage range
allows greater performance and economy than would be possible
without Adaptive Transformation, which is enabled by Vicor’s
proprietary class of Cascaded Topologies.
The PFM uses a Sine Amplitude Converter (SAC) Cascaded Topology
providing zero-voltage/zero-current switching through a low Q
resonant circuit to eliminate switching losses. The SAC can be
operated efficiently at high frequencies, typically in the 3 MHz range.
The high operating frequency allows miniaturization of power train
components with a commensurate increase in converter power
density. High operating frequency and soft switching makes EMI
filtering components smaller than those required by lower frequency,
hard switching converters.
Figure 3
— 120 Vac input configuration
Figure 4
— 240 Vac input configuration
+IN
–IN
Control
To PRM
+IN
–IN
To PRM
Control
PFM Theory of Operation
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