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| 型号： | FARM2TN1 |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 750 W AC-DC UNREG PWR SUPPLY MODULE |
| 文件页数： | 7/11页 |
| 文件大小： | 633K |
| 代理商： | FARM2TN1 |
Set your site on VICOR at vicorpower.com
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
FARM, Filter/Autoranging Rectifier Module
Rev. 6.0
Page 5 of 11
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
相关PDF资料 |
PDF描述 |
|---|---|
| FARM2HF2 | 1-OUTPUT 750 W AC-DC UNREG PWR SUPPLY MODULE |
| FARM1C13 | 1-OUTPUT 500 W AC-DC UNREG PWR SUPPLY MODULE |
| FARM1C22 | 1-OUTPUT 500 W AC-DC UNREG PWR SUPPLY MODULE |
| FARM2H13 | 1-OUTPUT 750 W AC-DC UNREG PWR SUPPLY MODULE |
| FARM1EG3 | 1-OUTPUT 500 W AC-DC UNREG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FARM2TN2 | 制造商:POWERBOX 制造商全称:Powerbox 功能描述:AUTORANGING AC INPUT WITH FILTER |
| FARM2TN3 | 制造商:POWERBOX 制造商全称:Powerbox 功能描述:AUTORANGING AC INPUT WITH FILTER |
| FARM2TS1 | 制造商:POWERBOX 制造商全称:Powerbox 功能描述:AUTORANGING AC INPUT WITH FILTER |
| FARM2TS2 | 制造商:VICOR 制造商全称:Vicor Corporation 功能描述:FARM Filter/ Autoranging Rectifier Module |
| FARM2TS3 | 制造商:VICOR 制造商全称:Vicor Corporation 功能描述:FARM Filter/ Autoranging Rectifier Module |
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