PS2-02-15893 datasheet, PDF - EEWORLD Datasheet

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PS2-02-15893: DescriptionSwitching power supply PFC MicroS; CategoryPower/power management Switching power supply; File Size1MB，25 Pages; ManufacturerVICOR; Websitehttp://www.vicorpower.com/

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Switching power supply PFC MicroS

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Product Category	switching power supply

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USER GUIDE | UG:122

PFC MicroS

Power Factor Corrected AC-DC Switcher

October 2012

Contents

Overview

of Product

Standard Features

Optional Features

Part Numbering

Mechanical

Considerations

Do's and Don'ts

Technical Description

"Quick Install"

Instructions

Mechanical Drawings

Output Connections

PFC Micro

Connector Kit

Power Connections

User Interface

Connections

Specificaitons

Output Power

Derating

Current Share Boards

Page

Overview

The PFC MicroS is an ultra low profile switching power supply that combines the

advantages of power factor correction (PFC) with high power density. This guide

covers both the standard and rugged COTS (MI) versions of the supply. The PFC MicroS

provides up to three isolated outputs (from one slot) and accommodates the following

Vicor DC - DC Converters:

VI-200/VI-J00:

1 full brick or 2 half brick

Maxi/Mini/Micro:

1 full brick, 2 half bricks or 3 quarter bricks

The use of these converters give the PFC MicroS the inherent power flexibility typical of

all Vicor products. Accepting input voltages of 85 Vac to 264 Vac, and 100 to 300 Vdc, the

PFC MicroS can provide up to 600 Watts in a package size of 1.86" H (47mm) x 5.06" W

(128,5 mm) x 7.95" L (201,9 mm). The PFC MicroS is factory configured to meet output

requirements of the user. Using the VSPOC configurator tool available on vicorpower.

com, anybody can now configure a PFC MicroS (and other Vicor power supplies) online.

UG:122

vicorpower.com

Applications Engineering: 800 927.9474

Page 1

Part Numbering

PFC MicroS

PSx

-x

)-xxxx-x

ex. PS2-20-6544-G

= number of outputs

= number of VI-200/VI-J00 modules

= number of Maxi/Mini/Micro modules

)

= optional Factory assigned

xxxx

= sequential number assigned by Vicor

-x

= optional Factory assigned

Note:

= MI for rugged chassis, = MC for rugged chassis with conformal coating

Mechanical Considerations

The PFC MicroS can be mounted on one of three surfaces using standard 8 - 32 or 4 mm

screws. Maximum allowable torque is 5 in. lbs., and the maximum penetration of 0.25 (6

mm) on the sides and 0.125 in. (3 mm) on the bottom.

When selecting a mounting location and orientation, the unit should be positioned so

air flow is not restricted. Maintain a 2" (5,1 cm) minimum clearance at both ends of the

PFC MicroS, and route all cables so airflow is not obstructed. The power supply draws

air in at the fan side/AC input side and exhausts air out the load side. If airflow ducting

is used, avoid sharp turns that could create back pressure. The fans move approximately

10 CFM of air.

Avoid excessive bending of output power cables after they are connected to the output

terminals. For high-current outputs, use cable ties to support heavy cables and minimize

mechanical stress on connectors. Be careful not to short-out to neighboring outputs. The

maximum torque recommended on output nuts is 10 in. lbs.

Avoid applications in which the unit is exposed to excessive shock or vibration levels as

the unit is designed primarily for office type equipment. In such applications, a shock

absorbing mount design is required.

PFC MicroS Do’s and Don’ts

Do not restrict airflow to the unit. The cooling fan draws air into the unit and forces

it out at the output power terminals. A minimum of 2” in front and behind the supply

should be maintained in order to prevent air obstructions.

Run the output (+/–) power cables next to each other to minimize inductance.

Use twisted pairs if possible.

Do not attempt to repair or modify the power supply in any manner. In the event of

problems, contact Customer Service at 1-800-735-6200.

Insert proper fault protection at power supply input terminals (i.e., a fuse).

Use proper size wires to avoid overheating and excessive voltage drop.

Output voltages over 60 Vdc, whether from individual modules or series arrays, are

considered as hazardous secondary outputs under UL 60950. Appropriate care must

be taken in design implementation of the supply.

UG:122

vicorpower.com

Applications Engineering: 800 927.9474

Page 3

Technical Description

The PFC MicroS consists of an off-line single phase, power-factor-corrected front end,

EMI filter, cooling fan, customer interface, power supply control circuitry, associated

housekeeping circuits, and a selection of Vicor’s VI-200/VI-J00 and/or Maxi/Mini/Micro

DC-DC converters.

Input AC mains voltage is applied to input connector MBJI. The input current is passed

through an EMI filter designed to meet conducted noise limit "A" specifications of FCC

Part 15.

At start-up, inrush current is limited by a PTC thermistor. The PTC is shunted out

shortly after initial power-up by a DC bus voltage sense circuit driving a relay. After

rectification, the input voltage is put through a boost converter that keeps the AC input

current sinusoidal and synchronized with the input AC voltage (in compliance with

EN61000). The boost converter delivers a regulated input to the hold-up capacitors and

a high voltage backplane. The backplane supplies power to the DC-DC converters that

provide the desired low voltage regulated outputs.

Output voltage conversion is achieved by Vicor’s family of Zero-Current-Switching

(ZCS) DC-DC converters. These are forward converters in which the main switching

element switches at zero current. This patented topology has a number of unique

attributes: low switching losses; high frequency operation, resulting in reduced size for

magnetics and capacitors; excellent line and load regulation; wide adjustment range for

output; low EMI/RFI emission and high efficiencies.

At initial power-up, the PFC MicroS outputs are disabled to limit the inrush current and

to allow the DC bus potential to settle out to the correct operating level. A low-power

flyback converter converts the high voltage DC bus into regulated low voltage to power

the internal housekeeping circuits and DC cooling fan.

The internal housekeeping Vcc comes up within 1 s after the application of input power.

Once the high voltage bus is within operating limits, the AC Power OK signal asserts to a

TTL "1," indicating the input power is OK, and the power outputs will come up

250 ms later.

An output Enable/Disable function is provided to control Vicor’s DC-DC converters.

If the Enable/Disable control pin is pulled low, the modules output is disabled. The

nominal delay associated for an output to come up when measured from release of the

Enable/Disable pin is 9 - 12 ms. The General Shutdown function controls all outputs

simultaneously and works in a similar manner.

Figure 1.

PFC MicroS Architecture

Input

Line Filter

Bridge

Rectifier

Soft Start

Circuit

Boost Converter

Output Card #1

Power

Output

PFC Control

Customer

Interface

Power Supply

Control

Enable/Disable -Power Good Read

Fan

Isolated

Housekeeping

Power Supply

UG:122

vicorpower.com

Applications Engineering: 800 927.9474

Page 4

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