Saturation is avoided in the core of the transformer used for direct conversion in a single-ended dc-to-dc converter of the type using auxiliary flyback conversion through a plural-winding inductor. This is done by resetting the core with a winding threading the core, through which winding the secondary current of the plural-winding inductor passes.
A constant-current, current-programmed dc-to-dc converter includes a controllable switch and an inductor. The switch is rendered conductive in response to a recurrent clock signal, and nonconductive in response to a comparison of a voltage representing the inductor ramp current with an output voltage error signal from a high impedance source, which establishes an output voltage control feedback loop. An overcurrent limiting circuit includes a current sensor having a low output impedance which produces a load current representative signal. The load current representative signal is applied to an amplifier having a low output impedance and which includes a diode in its feedback loop to maintain it nonsaturated. A second diode is connected to the output of the amplifier and to the high impedance output terminal of the error voltage source to close a current limiting degenerative feedback loop which swamps the error voltage when the second diode becomes conductive due to excess load current. This reduces the peak value of inductor current sufficient to maintain the desired load current limit.
Isbn (Books And Publications)
Juvenal And Boileau: A Study Of Literary Influence
robert colton (1982-1986), James Carey (1979-1983), Jason De Arte (1978-1980), Erin Dodd (1988-1992), Cindy Coleman (1964-1968), Lauren Smith (1963-1967)