Switching power supply device
First Claim
1. A switching power supply device having a series combination of a first switching circuit and an input power source connected in series with a series combination of a first winding of a transformer and an inductor, a series combination of a second switching circuit and a switched capacitor connected in parallel to a series combination of said first winding of the transformer and said inductor and further wherein a second winding of said transformer is provided with a rectifying smoothing circuit including a rectifying element,wherein said first switching circuit comprises a parallel connection circuit including a first switching element, a first diode, and a first capacitor,said second switching circuit comprises a parallel connection circuit including a second switching element, a second diode, and a second capacitor,and further comprising a switching controlling circuit adapted to turn said first and second switching elements on and off alternately with a period of time when both switching elements are off being interposed, anda capacitor being connected in parallel to said rectifying element in said rectifying smoothing circuit.
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Accused Products
Abstract
A switching power supply device has a configuration in which a series combination of a first switching circuit and an input power source is connected in series with a series combination of a primary winding of a transformer and an inductor, a series combination of a second switching circuit and a capacitor is connected in parallel to the series combination of the primary winding of the transformer and the inductor, and the secondary winding of the transformer is provided with a rectifying smoothing circuit including a rectifying element. The first switching circuit is made up of a parallel connection circuit including a first switching element, a first diode, and a first capacitor. The second switching circuit is made up of a parallel connection circuit including a second switching element, a second diode, and a second capacitor. A switching controlling circuit is provided adapted to turn the first and second switching elements on and off alternately, with a period of time when both switching elements are off is interposed, and a capacitor is connected in parallel to the rectifying diode in the rectifying smoothing circuit.
63 Citations
42 Claims
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1. A switching power supply device having a series combination of a first switching circuit and an input power source connected in series with a series combination of a first winding of a transformer and an inductor, a series combination of a second switching circuit and a switched capacitor connected in parallel to a series combination of said first winding of the transformer and said inductor and further wherein a second winding of said transformer is provided with a rectifying smoothing circuit including a rectifying element,
wherein said first switching circuit comprises a parallel connection circuit including a first switching element, a first diode, and a first capacitor, said second switching circuit comprises a parallel connection circuit including a second switching element, a second diode, and a second capacitor, and further comprising a switching controlling circuit adapted to turn said first and second switching elements on and off alternately with a period of time when both switching elements are off being interposed, and a capacitor being connected in parallel to said rectifying element in said rectifying smoothing circuit.
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3. A switching power supply device having a series combination of a first switching circuit and an input power source connected in series with a series combination of a first winding of a transformer and an inductor, and a series combination of a second switching circuit and a switched capacitor connected in series with a series combination of said first winding of said transformer, said inductor, and said input power source, and further wherein a second winding of said transformer is provided with a rectifying smoothing circuit including a rectifying element,
wherein said first switching circuit comprises a parallel connection circuit including a first switching element, a first diode, and a first capacitor, said second switching circuit comprises a parallel connection circuit including a second switching element, a second diode, and a second capacitor, and further comprising a switching controlling circuit adapted to turn said first and second switching elements on and off alternately with a period of time when both switching elements are off being interposed, and a capacitor being connected in parallel to said rectifying element in said rectifying smoothing circuit.
Specification