Download RFT-V Circuits

REMOTE POWER SYSTEM
”Turning your copper into gold”
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What?
Powering remote electronics utilizing
the existing copper network
Also known as ‘span power’ or ‘line power’
Powering a broadband/xDSL network
Increased bandwidth requires active
components (DSLAM) closer to the end user
Solutions for power distributions required
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What?
CO site with
excisting 48Vdc
sytem and
battery backup
Typical distance
to remote DSLAM
site is 5 to 10km
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Why?
CAPEX & OPEX reductions
Utilize the existing infrastructure
Copper network, X-connects, etc.
Eliminate the requirement for batteries and local
power utilities
Reduces the size of the DSLAM significantly
Battery maintenance eliminated
Increased speed of xDSL roll-out
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How?
RFT: Remote feeding telecommunication circuit
Power limitation: 100W per channel/circuit
RFT-C circuits: Current limited to
60 mA, maximum 1667V (100VA)
normally limited to 800V
RFT-V circuits: Voltage limited to
200Vdc referred ground
OVS and ground leakage current detection
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How?
Block
schematics
based on Eltek
products
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Modules
System Solutions
Flatpack DC/DC Converter 48/190
Flatpack VA Limiter
Remote End Converter
Flatpack RPS Integrated
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Central Office
modules
Flatpack DC/DC Converter
Flatpack VA Limiter
Input: 48Vdc (40-60Vdc)
Input: ±190Vdc
Output: 190Vdc of 1250W
Output: ±190Vdc 12 Channels
Reliable ”Flatpack” technology
(RFT-V Circuits) of 100W
Digital current sharing
Short circuit proof
High temp protection
Over voltage shutdown
Part no.: 241114.501
(250mA)
Current limiters
Overvoltage protection
Ground leakage current protection
1.000.000h MTBF per channel
Part no.: 241258.724
CE, UL and NEBS approvals
IEC/UL60950-21 (”remote powering safety standard”)
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Remote End
Converter
5 separate DC/DC converters
Primary surge protection integrated
Input voltage: 190V-380V
Output voltage: 48V
Output power: up to 380W
depending on site layout (typically
250W)
Flexible mounting, eats no space in
DSLAM rack
Part no: 241258.722
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Flatpack RPS
2U Integrated
2U Integrated
2 DC/DC Converters
2 VA Limiters
24 output channels (RFT-V
Circuits)
Single or dual feed
19”/23” mounting
Part no: CF0400.002
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Flatpack RPS
– building block
6U Integrated (building block)
For larger cabinet solutions and
expandable systems
Up to 6 DC/DC Converters
Up to 6 VA limiters
Up to 72 output channels
48Vdc feed configurable on site
1 x 250A
3 x 100A
6 x 50A
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Site installation
System dimensioning
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Safety
Crossover between telecom and power
Above 60V SELV level
Important
Qualification & identification of twisted pairs
Training of installation and maintenance
people
Follow Eltek installation manuals (including
the advanced configuration tool)
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System
dimension
Stability criteria's
The power consumption has to be less than the power available
Ohms Law is applicable!
Minimum voltage in the Remote End is half the central Office
voltage for stable operation
Too high line impedance will result in decreasing output power
for increasing current
Optimizing power transfer distance
More power?
Add more channels
Longer distance?
Add more pairs in parallel
Wire gauge
Affect the line resistance, hence the transfer length
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Configuration
tool
General
examples
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The end
Thank you for your time!
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VA Limiter
On/Off switch
I+ CURRENT SENSE
+190V input
from dc/dc
converters
Over load
detection
Over voltage
protection
Ground leakage
current detect
Secondary
protection;
gas
discharge
tube
Current limiters
for lightning and
AC power fault
protection
Over load
detection
-190V input
from dc/dc
converters
On/Off switch
I- CURRENT SENSE
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