L3's Electronic Power Conditioner (EPC) transforms the regulated or unregulated satellite bus voltage into the high voltages required for a specific TWT, and provides power to the associated LCAMP as required. L3 EDD’s heritage for commercial space TWTAs began in 1973. Since then we have designed, produced and delivered numerous different EPC models covering TWTA output power levels ranging from 2 watts to over 300 watts, and frequency Bands from L-Band to V-Band.
Design
All L3 EDD EPC models incorporate the same basic circuit topology and mechanical configuration. They differ only to accommodate unique program requirements, such as magnitude of power processing, bus interface, commands, telemetry and auxiliary supplies. The basic design is a modular concept allowing interchange of the basic elements (low- and high-voltage) with minimal impact. This approach is proven out by our excellent EPC reliability, discussed below.
Reliability
Modern L3 EPCs (the 2000Hx, 2300Hx and 2400Hx/2410Hx series) have accumulated over 100 million operating hours in orbit with a FIT rate of less than 100 (spot FITs). Our reliability record validates our conservative design philosophy, particularly with regard to high-voltage design criteria.
Model
Single / Dual
Reg / Unreg
Bus Voltage
Max DC Power Handling
Approx. Efficiency
Mass Range
Shipped
In Orbit
2000Hx
Single
Regulated
36 - 100 V
300 W
94%
1080 to 1360 g
2,682
2,214
2300Hx
Single
Unregulated
21 - 46 V
300 W
94%
1080 to 1360 g
161
40
2400Hx
Dual
Regulated
36 - 100 V
550 W
94%
1720 to 1850 g
1,320
1,132
TOTAL
4,163
3,386
Modern L3 EDD EPCs In Orbit: > 3300
(> 140 million hours, Spot FIT Rate: < 150)
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