either a rolled or folded configuration. The blanket modules would be connected together in a parallel/series arrangement to obtain the desired voltage output of 40 to 45 kv. Figure 10 illustrates the method of attaching the silicon solar cell blankets to the support structure. The GaAlAs blankets would be attached in a similar fashion. The reflector panels for the GaAlAs option are pleated at intervals to produce an accordian fold and then rolled for storage and shipment to orbit. The reflector panels would be attached to the primary structure by cables (catenaries). The primary structure for solar array and microwave transmitting antenna is an open truss-type design. The structure material is a graphite-fiber reinforced thermoplastic composite. The basic elements (beams) are designed for automatic fabrication in space. The CR1 silicon cell option would utilize a rectangular configuration constructed with truss-type beams. The CR2 GaAlAs option utilizes similar construction elements for the solar array structure, but would include additional elements to form the structure for attaching solar reflectors. E. Power Distribution The prime function of the power distribution system is to accumulate and control prime power from the solar cell panels; control, condition, and regulate the quantity and quality of the electrical power generated for the microwave generators; provide for the required energy storage during solar energy occulation or system maintenance shutdown; and provide for monitoring fault detection, and fault isolation disconnects. Figure 11 shows a schematic diagram of the solar array power collection and distribution system. The solar array is divided into power sectors. Each power sector is switchable and can be isolated from the main power bus, facilitating solar cell annealing operations (for silicon cells) and/or other servicing. Solar array power is controlled by high voltage circuit breakers near the buses. Voltage is controlled by turning groups of strings on or off, depending on load requirements. Two sections of the array provide the required voltage at the sliprings using the sheet conductor voltage drop to achieve the required voltage at the sliprings.
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