D. C. - A. C. Inverter Protection.
DEPARTMENT OF THE ARMY WASHINGTON DC
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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
- Electrical and Electronic Equipment
- Electric Power Production and Distribution