Design and performance analysis of a medium-power dc-dc converter
Arthur G. Birchenough, Francis Gourash, United States. National Aeronautics and Space Administration, Lewis Research Center
National Aeronautics and Space Administration, 1970 - Technology & Engineering - 21 pages
The design and performance of an experimental dc-dc converter are described. The converter was rated for a power output of 1 kW, with a 150-percent overload rating, and it produced a 200-V, +1-percent, dc output from an input of 56 V, +10 and -20 percent. Voltage regulation is accomplished by varying the duty cycle of the internal 7-kHz quasi-square-wave carrier. Integrated circuits in the control section, a proportional current drive system, and powdered metal cores (Ni-17Fe-2Mo) for the power transformer were some of the design features. The measured efficiency peaked at 92 percent and was 88 percent at 1 kW. The total component weight was 6 lb (2.7 kg).
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150 percent 92 percent approximately 1 watt base junction breadboard model bridge circuit carrier frequency collector current collector-emitter control and voltage control circuit converter design Converter Operation Core loss current drive stages current drive system current feedback Current transformer curve dc input dc output DESIGN AND PERFORMANCE drive circuit drive signal width duty cycle efficiency was greater fast recovery filter capacitor flip-flop full-bridge IC^g illustrated in figure increased Input filter integrated circuits kilohertz kilowatt leakage inductance Lewis Research Center magnetic components NAND gate NASA NASA TN output power Output Q Output transformer overload peak current peak voltage power output stage Power stage transistors power supply power transformer power transistors proportional current drive quasi-square-wave regulation quasi-square-wave signal quasi-square-wave voltage rated rectifiers Dgg reduced reliability saturation characteristics shown in figure square waves square-wave switching speed toroidal voltage is proportional Voltage On drive Voltage regulation voltage spikes volts waveforms