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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Power converter for ion thrustors with pulse width modulated bridge inverter with silicon power transistor using current feedback base drive
Design verification tests for logic and low level circuits, and preliminary single-phase breadboard of pulse width modulated static inverter
Evaluation of pulse width modulator and power driver for integrated dc power amplifier
Asynchronous pulse-amplitude pulse width model of human operator performance
Circuit design and performance to convert DC INPUT voltage to pulse train with width proportional to input
Nondissipative dc to dc regulator converter - magnetic study, pulse width and frequency modulation, square wave sources, power losses in saturated transformers, and output filter
Design and manufacture of direct current torquer amplifier with pulse width modulation circuit
Pulse width modulator and other microminiaturized electronic equipment for space age applications
Linear power amplification with switching techniques, using pulse width modulation
Pulse width modulation voltage regulator design for power conversion applications, considering interrelation of loop gain, switching frequency, etc
Capacitive integrator circuit using Silicon Controlled Switches /SCS/ insures output voltage linearly proportional to input pulse width. This circuit provides high input impedance and relatively low output impedance.
Solid state circuit provides four-quadrant multiplication at frequencies ranging from dc to 100 cps using pulse-width and -height multiplication techniques. The circuit consumes little power and has an accuracy of approximately one percent.
Sensitivity of sampled data systems with finite sampling duration derived as function of pulse width
Small magnetic amplifiers pass square waves through transformers and provide regulation by varying the pulse width on the secondary of the output power transformers. This pulse duration modulation is provided by a control rectifier technique or a phase-shift technique.
Transient analysis of arterial fluid lines with respect to time domains and pulse width
Pulse width modulated switching voltage regulators applied to Maximum Power Point Tracking /MPPT/ space power systems
Calibration measurements for the cooled (253 K) photomultiplier tube (PMT) detector, used on the receiver channel of the transmit/receive (T/R) switch for GOPEX, were conducted in the laboratory. A pulsed frequency-doubled neodymium:yttrium-aluminum-garnet (Nd:YAG) laser was used to direct 532-mn light on the PMT. By monitoring the energy per pulse of the light incident on the PMT, the minimum number of photons detected could be determined. These results agreed with the photon flux back-calculated from the PMT output waveform. Approximately 700 incident photons arriving during a temporal pulse width of approximately 65 nsec were detected with a signal-to-noise ratio (SNR) of approximately 1. Other receiver channel characteristics, such as PMT dark currents, optical transmission, and interference filter sensitivity to angle of light incidence, were also measured.