|
E3000 - FM
ULTRACOMPACT Mosfet Amplifier 3kW OUT
E
3000 is the new top FM broadcast amplifier
designed by Elenos. It’s the smallest and lightest 3Kw
amplifier in the world, and changes the conception of all
3kw Mosfet transmitters.
The Philips Mosfet BLF278 on its 12 RF modules are used at
250W power output in low-stress conditions. Each module is
running at 90% rated power offering a better MTBF.
To reduce the harmonic current emission to the main, the 3
AC/DC switching power supply units are equipped with PFC
(Power Factor Corrector.
The current sharing between PSU’s is performed by a
robust digital control that works at any RF output power
level. The good matching between the PSU’s ensures a
greater reliability and allows higher output power to be
reached. The PSU’s are also overheating temperature and
short circuit protected. MOV devices also protect the
equipment from any low energy fast transients in the
mains. E 3000 can
operate with one power supply a reduced power level.
Available single-phase or three-phase.
ICE FET ® technology and
high-efficiency heatsink
The innovative ELENOS
ICE FET® technology, together with a high-efficiency
heatsink (ELENOS patented design), lead to a considerable
heat dissipation reduction, so that it’s more reliable.
A dedicated algorithm optimises the efficiency at all
output power levels, automatically adjusting Mosfets’
drain voltages and bias of MOSFETs.
New RF combiner ELENOS
®
The E 3000 uses a
polygonal combiner (ELENOS patented design), instead of
traditional RF power combiners.
In traditional combiners, the combining of 12 power
modules uses a considerable space for multiple
transmission lines with a loss in the overall RF power.
This power loss generates heat which is detrimental to the
overall efficiency.
The patented ELENOS system uses polygonal type combiner in
a single jump, thereby reducing the power dissipated by
approximately 50% compared with the traditional couplers -
whilst maintaining a high level of insulation between the
inputs, guaranteeing perfect operation under any fault
condition on the MOSFET’s.
An additional impedance transformer stage, located before
the output low pass filter, better suppresses the
harmonics.
Measurements, Controls and Protections
5 microcontrollers with CISC and RISC architecture
guarantee that it never stops working.
The control software is based on a proprietary real-time
multitasking operating system and uses parallel
programming techniques and fuzzy logic to optimise the
operational parameters.
Algorithms are implemented for efficiency maximization,
cooling adjustment, automatic output power derating in
case of faults or overheating.
All parameters of the equipment are controlled by
amplifier’s CPU board who interacts with them to ensure
perfect operation always. The information are processed by
a bus IEE485 in a numeric form, avoiding problems and
measurement errors that might occur from interferences,
electromagnetic fields, noise etc.
The distributed intelligence control logic manages:
- DC current of each 250W
RF module
- 9 temperature probes,
placed at various points of the E
3000 , to get a detailed thermal mapping of
the amplifier
- the VSWR fast protection
circuit which controls the RF stages bias
- the soft start algorithm
that reduces the thermal stress of the MOSFETs in the
event of start-up at temperatures below zero degrees.
- fans speed to optimise
the air flow depending on the effective heat exchange
requirements of the system
- measurement of the air
input temperature
- measurement of the
current, voltage and temperature of each power supply
unit
- measurement of the
direct and reflected output power
- calculation of the RF
efficiency
- alphanumeric display,
incremental encoder and signalling LED’s
- telemetries and SMS
Detailed design
The traditional thermo-magnetic switch has been replaced
by a hydro-magnetic switch with an extremely high
stability at temperatures of between -40° and + 85°C in
order to best protect the equipment.
6 very high efficiency, low noise DC fans, of the
“ultra-long life brushless” type to provide 800
m3/hour air flow and more than 50,000 hours of operating
life.
Telemetry and SMS
By using a GSM modem and any DOS or Windows communication
programme (Telix, Procomm, HyperTerminal) it is possible
to remotely control and interact with E
3000 .
Up to 5 preset mobile phone numbers are notified through
SMS in case of alarm if the equipment is connected to a
GSM modem.
E 3000 also has I/O
logic commands for connection to change-over equipments
and/or external telemetry.
|
