Patent
Dc/dc voltage converting device
TLDR
In this article, a DC/DC voltage converting device is obtained for boosting a DC power supply voltage to provide a higher output voltage, comprising soft start circuit 20 for gradually increasing the turning-on duration of transistor 34 in boosting circuit 30; pulse width control circuit 60 for providing a modulated pulse signal P2 to control the boosted voltage.Abstract:
A DC/DC voltage converting device is obtained for boosting a DC power supply voltage to provide a higher output voltage, comprising soft start circuit 20 for gradually increasing the turning-on duration of transistor 34 in boosting circuit 30; pulse width control circuit 60 for providing a modulated pulse signal P2 to control the boosted voltage. The device further comprises boosting circuit 30 including an inductor 32, diode 36 and transistor 34. Boosting circuit 30 provides a predetermined boosted voltage higher than the power supply voltage by alternately turning on and off transistor 34. The turning-on duration of transistor 34 is gradually increased during the initial operation period by soft start circuit 20, and is controlled by modulated pulse signal P2 during a stable operation period. The device further comprises gate circuit 40 having diode 46 and transistor 44, and step up circuit 70. Step up circuit 70 turns off transistor 44 during the initial operation period, and turns it on while transistor 34 is off during the stable operation period to allow an efficient current flow from boosting circuit 30 to output terminal 58. Any counter current flow from output terminal 58 to boosting circuit 30 is inhibited during the initial operation period.read more
Citations
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References
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Patent
Soft start for five pin switching regulators
TL;DR: In this article, a soft start circuit for a switching regulator operating in the voltage boost mode is described, which does not require any off-chip parts and therefore a five-pin package can be employed.
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TL;DR: In this article, an undervoltage monitoring unit and a pulse width modulator PBM with at least one soft start input and one enable input are connected to a startup circuit.
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TL;DR: In this paper, a buck-to-dc power converter with a flywheel and an inductor is described, where the inductor current polarity reverses each cycle, raising the node voltage to the level of the input voltage, substantially eliminating turn-on losses of the first FET.
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Sergio Palara,Stefano Sueri +1 more
TL;DR: In this paper, a circuit switches the power supply of the integrated circuit over to the input voltage of the switching regulator during the initial starting phase, and over to output of the regulator once the steady state has been reached.