Electronic Power Conditioner
(EPC) for Single or Dual
(LC)TWTA
Applications
The Electronic Power Conditioner
(EPC) is the power supply of the
Travelling Wave Tube Amplifier
(TWTA), designed for:
o
o
o
Communication satellite payload
and TTC
Observation
and
science
satellite payload
Deliverable as Single or Dual
TWTA with or without Linearizer
(LTWTA)
and/or
Channel
Amplifier (LCTWTA).
Main features
♦
♦
♦
♦
♦
♦
♦
♦
Single or Dual TWT / LCAMP
supply
Compatible with most space
qualified TWT’s
Technical Description
o up to 170 W conductive and
♦ Standard design for all Travelling Wave Tube power and
radiative TWT’s
frequency bands
o L, S, C, X, Ku, Ka bands
o up to 2 x 170W RF Ka-band for Dual version
Compatible with most bus
o up to 1 x 170W RF Ku-band for Single version
interfaces (command & telemetry
♦ Flexible design allows anticipation and quick customization
formats)
of performance
Compatible with most primary
♦ Very high TWT voltage & current stability for stable TWTA
power bus
performances
Auxiliary power supply for
♦ Outstanding power/mass ratio
channel amplifier and/or
♦ Fully potted high voltage section
linearizer
♦ Extensive use of surface mounted devices
High level of protection
♦ ASIC dedicated to TWTA operating management
Operation at critical pressure and
♦ Power Flexibility (0 -3dB /64steps)
in plasmic propulsion environment
♦ Frequency Flexibility (over Ku band/126 steps)
Radiation hardened design
♦ Sleep Mode (Dual channel on/off management)
Production Capability
Background
♦
Delivery schedule : 12 months
♦
♦
(LC)TWTA integration facility
Capacity :
o Single (LC)TWTA : 50 per year
o Dual (LC)TWTA : 100 per year
♦
♦
♦
♦
Fully ESA qualified
Strong heritage for single EPC/TWTA on programs: Express AM,
Rosetta, , Star One C1/C2, , DFH3, GSAT4, Koreasat, Pleiades,
Chinasat 9, Turksat, Gokturk, Loutch, Yahsat, W3B/C/D, Nilesat,
Paksat, Sentinel, Sicral2, CSO.
Almost 800 FM ordered for Single TWTA on which nearly 700
are in flight
More than 25 millions hours total operation in orbit (May 2011) for
Single TWTA with 350K hours of the EPC 3G MP generation
EPC block diagram
V + aux
V - aux
INTERNA
L SUPPLY
AUX. REG.
START
UP
TW
T
F
FK
FILAMENT
TFO
Single
HV TSFO
K
W
I K REG.
A0
POWER
BUS
INPU
C4
C3
C2
HELI
XREG.
PRIMARY
REG.
C1
A1
H
H
V
T
C
PROTECTIONS
4
TM/T
C &
STATUS
TM
IH &
V
SECURITIES
A
MONITORIN
4
GALVANIC
INSULATION
ANALOG
TM
IH, VA,
T°
CS97/025
L
V
V + aux
V - aux
INTERNA
L SUPPLY
AUX. REG.
START
UP
TW
T
F
FK
FILAMENT
TFO
Dual
HV TSFO
K
W
I K REG.
A0
POWER
BUS
INPU
C4
C3
C2
HELI
XREG.
PRIMARY
REG.
C1
A1
H
H
V
T
C
PROTECTIONS
4
TM/T
C &
STATUS
TM
ANALOG
TM
IH, VA,
T°
IH &
V
SECURITIES
A
MONITORIN
4
GALVANIC
INSULATION
CS97/025
L
V
EPC typical performances
Single version
Dual version
TWTA output power
15 to 170 W RF Ku
15 to 130 W RF Ka
2x50 to 2x170 W RF
EPC DC output power
Up to 250 W DC
Up to 550 W DC
TWTA frequency band
L, S, C, X, Ku, Ka
TWT types
Low or high perveance
Conductive or radiative cooling
Anode 1 & Wehnelt
Primary power bus
Up to 5 collectors
50V or 100V regulated
28V, 50V or 100V; regulated or
semi-regulated
EPC efficiency
Up to 95%
Up to 95%
Auxiliary supply
Power supply 5 to 15V, up to 10W
total power
Power supply 5 to 15V, up to 13W
total power
EPC weight
< 1300 g
< 2250 g
Dimensions (excl.
fixation)
Baseplate : 177 x 64.5 mm2
Overall : 185 x 67 x 126 mm3
Baseplate : 250 x 94 mm2
Overall : 250 x 94 x 155 mm3
Operating - 20°C to +70°C
Qualification
temperature
Switch on -40°C
Vibration
> 26 grms(z) – 20 grms (x-y)
> 30 grms (z) – 20 grms (x-y)
Shock
up to 5700g (x-y <4000g)
up to 4200g (x-y <2100g
@1 0KHz)
380 fits
Dual common : 420 fits
Channel A/B : 70 fits
Reliability
@ 40°C baseplate
15 years
Design life
Power Flexibility via
TC (A0 range)
Frequency Flexibility
via TC (Vkh range)
1320V (0 to -2.5 dB)
Not available
This datasheet is not contractual and can be changed without any notice.
For further information, please contact
Thales Alenia Space ETCA
101, rue Chapelle Beaussart
B-6032 Mont-sur-Marchienne
Belgium
Tel.: + 32(0) 71 44 23 11
Fax: + 32(0) 71 44 22 00
E-mail : etca.info@thalesaleniaspace.com
Website : www.thalesaleniaspace.com
2090V (0 to -3 dB; 6 bits)
550V (@ Vkh/Vkci cst; 7bits)
Updated :June 2012