Design of a three-phase, 15-kilovolt-ampere static inverter for motor-starting a Brayton space power system
Robert J. Frye, Arthur G. Birchenough, United States. National Aeronautics and Space Administration, Lewis Research Center
National Aeronautics and Space Administration, 1972 - Technology & Engineering - 20 pages
The design of a three-phase, 400-Hz, 15-kVA static inverter for motor-starting the 2- to 15-kWe Brayton electrical space power system is described. The inverter operates from a nominal 56-V dc source to provide a 28-V, rms, quasi-square-wave output. The inverter is capable of supplying a 200-A peak current. Integrated circuitry is used to generate the three-phase, 400-Hz reference signals. Performance data for a drive stage that improves switching speed and provides efficient operation over a range of output current and drive supply voltage are presented. A transformerless, transistor output stage is used.
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15-kilovolt-ampere 56-volt dc source alternator neutral amplifier base drive signals Brayton cycle Brayton electrical BRAYTON SPACE POWER Brayton system startup Capacitor C2 circuit waveforms core D4 and D5 drive circuit drive stage drive supply voltage dwell-time circuitry dwell-time stage eliminating the need Figure 17 flip-flop frequency gate IC1 hertz input contactor input filter input to gate integrated circuits inverter circuitry INVERTER FOR MOTOR-STARTING inverter operates inverter was designed isotope Brayton Kilowatt Lewis Research Center low-level circuitry low-voltage regulator motor-start inverter NASA nominal 56-volt dc operate the alternator operational amplifier output of gate output stage output transistor collector output-stage transistors peak current Phase positive input power circuitry power dissipation predrive circuitry predrive stage pullup pulse Q4 base current Ql and Q2 quasi-square-wave output R-C network resistor shown in figure SPACE POWER SYSTEM static inverter synchronous speed third harmonic three-phase divider circuitry transistor collector current transistor Q4 typical Brayton system voltage regulator volts