Interleaved DC to DC flyback converters with reduced current and voltage stresses
First Claim
1. An interleaved DC to DC flyback converter comprising:
- DC input supply lines;
an input capacitor connected to the DC input supply lines;
a first and a second flyback transformer means each having a primary winding and at least one secondary winding, each of said first and said secondary windings having a first and a second terminals;
a first and a second switching means controlled with 180°
phase shift relative to each other for providing a regulated energy flow from the DC input supply lines, each of the first and the second switching means being coupled in a series circuit with the primary winding of the corresponding transformer means, each of said two series circuits being connected in parallel with the input capacitor;
a first catch rectifying means connected between the first and the second terminals of the secondary windings aiding each other;
an output filter capacitor having two terminals coupled with opposite terminals of said secondary windings;
a second catch rectifying means connected between the first terminals of the secondary windings;
a third catch rectifying means connected between the second terminals of the secondary windings; and
a control circuit for driving alternately the first and the second switching means with a predetermined duty ratio.
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Accused Products
Abstract
Interleaved flyback DC to DC converters are provided comprising a first and a second switching transistors controllable with 180° phase shift and a first and a second flyback transformers. A primary winding of each transformer is coupled in a series circuit with the corresponding switching transistor. A secondary winding of the first transformer is coupled with the secondary winding of the second transformer via a first catch diode and both said secondary windings are coupled to an output filter capacitor via a second and a third catch diode, correspondingly. When discharging to the output filter capacitor, the transformers interlock each other. By interlocking, non-pulsating output current is generated and voltage across switching transistors is reduced. A secondary quasi-resonant snubber network relieves voltage spikes across the switching transistors. A common magnetic core of the transformers cuts the cost and the size of the interleaved flyback converters.
174 Citations
15 Claims
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1. An interleaved DC to DC flyback converter comprising:
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DC input supply lines; an input capacitor connected to the DC input supply lines; a first and a second flyback transformer means each having a primary winding and at least one secondary winding, each of said first and said secondary windings having a first and a second terminals; a first and a second switching means controlled with 180°
phase shift relative to each other for providing a regulated energy flow from the DC input supply lines, each of the first and the second switching means being coupled in a series circuit with the primary winding of the corresponding transformer means, each of said two series circuits being connected in parallel with the input capacitor;a first catch rectifying means connected between the first and the second terminals of the secondary windings aiding each other; an output filter capacitor having two terminals coupled with opposite terminals of said secondary windings; a second catch rectifying means connected between the first terminals of the secondary windings; a third catch rectifying means connected between the second terminals of the secondary windings; and a control circuit for driving alternately the first and the second switching means with a predetermined duty ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An interleaved DC to DC flyback converter comprising:
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DC input supply lines; an input capacitor connected to the DC input supply lines; a first and a second flyback transformer means each having a primary winding and at least one secondary winding, each of said first and said secondary windings having a first and a second terminals; a first and a second switching means controlled with 180°
phase shift relative to each other for providing a regulated energy flow from the DC input supply lines, each of the first and the second switching means being coupled in a series circuit with the primary winding of the corresponding transformer means, each of said two series circuits being connected in parallel with the input capacitor;a fourth and a fifth catch rectifying means each connected in a first and a second series circuit, respectively, with the secondary winding of the corresponding transformer means, said series circuits being coupled together aiding in a third series circuit; a first and a second free willing rectifying means connected across the first and the second series circuits correspondingly; an output filter capacitor coupled in parallel with the third series circuit; and a control circuit for driving alternately the first and the second switching means with a predetermined duty ratio. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification