Parallel-Connected Converters with Innovative Control

VPT Inc. proposes a modular, high-efficiency series-connected boost regulator (SCBR) solar array peak-power tracker (PPT). The modular SCBR PPT allows fault-tolerant parallel operation and is ideal for an expandable satellite power system. Theproposed approach combines several innovative technologies and features. Theseinclude (1) use of proven VPT standard product hybrid dc-dc converters capable ofscreening to space quality levels, (2) use of a VPT proprietary current sharingmethod that provides for fault tolerance with a single current share bus and nomaster-slave operation, (3) use of a VPT patented magnetic feedback control (without optocouplers) that allows operation down to the zero volts, necessary for SCBRoperation, and (4) demonstrated radiation tolerance to over 100Krads total dose and60MeV of single-event operation. For lower cost, systems can be configured withVPT's commercial off-the-shelf (COTS) modules. In this Phase I SBIR VPT will (1)design proposed changes into one of VPT's standard product dc-dc converter modulesto allow SCBR operation without the need for external circuitry, (2) design a current sharing method into the module using a common fault-tolerant current share bus, (3) design a dither-based PPT controller, and (4) demonstrate operation of the modularSCBR PPT system with a breadboard. A low-cost, modular, space-qualified peak-power tracking system that is ideal for small or medium-size satellites