D. C. - A. C. Inverter Protection.
Abstract
The A.C. synthesizer is a unit developing several hundred watts at 60 Hz by pulse-width modulation techniques, with an 8 KHz sawtooth oscillator modulating a 60 Hz reference. Several failure modes common to electronic equipment caused the output stages designed for a pulse rate of 8 KHz to experience inputs from 60 Hz to as low as D.C., which inputs destroy expensive transistors. The addition of a retriggerable 'one-shot' (monostable multivibrator) to inhibit the pulse width modulator output if not retriggered each 8 KHz cycle eliminates the catastrophic effect of most failure modes, allowing the output stage to reject low frequency pulses. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1980
- Accession Number
- ADD007907
Entities
People
- Albert H. Ashley
Organizations
- United States Army