Title :
Study of oscillations due to turn-off delay variations in DC-to-DC converters employing BJT switches
Author :
Thottuvelil, V. Joseph ; Wilson, Thomas G. ; Owen, Harry A., Jr.
Author_Institution :
Digital Equipment Corp., Maynard, MA, USA
Abstract :
Oscillations in open-loop DC-to-DC converters using bipolar junction transistor (BJT) switches due to modulation of the turn-off delay by the switch current are investigated. Simulations using a piecewise-linear equivalent circuit and a simple linear relationship between turn-off delay and switch current are used to predict the amplitude and frequency of the waveforms of inductor current and output voltage. The results of experimental measurements, time-domain simulations, and small-signal modeling all agree well.
Keywords :
bipolar transistor circuits; circuit oscillations; equivalent circuits; piecewise-linear techniques; power convertors; semiconductor switches; switching circuits; BJT switches; DC-to-DC converters; bipolar junction transistor; boost convertor; buck convertor; inductor current; open-loop convertors; oscillations; output voltage; piecewise-linear equivalent circuit; power convertors; small-signal modeling; switch current; time-domain simulations; turn-off delay variations; Circuit simulation; DC-DC power converters; Equivalent circuits; Frequency; Piecewise linear techniques; Predictive models; Propagation delay; Switches; Switching circuits; Switching converters;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18230
