Soft-switched full-bridge converter
First Claim
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1. An improved, constant-frequency, phase-shift-controlled full-bridge dc-to-dc converter, comprising:
- first and second pairs of serially-connected controllable switching devices, each pair adapted to connect across a power source, each of said controllable switching device comprising a switch, an antiparallel diode coupled across said switch and a capacitor coupled across said switch;
a coupled inductor having first and second windings, each winding having a first terminal and a second terminal, said second terminals of said first and second windings being connected to form a common terminal of said coupled inductor;
first and second blocking capacitors, said first blocking capacitor being coupled between said first terminal of said first winding of said coupled inductor and a common terminal of said first pair of controllable switching device, and said second blocking capacitor being coupled between said first terminal of said second winding of said coupled inductor and a common terminal of said second pair of controllable switching device;
a transformer having first and second windings, said first winding of transformer being coupled between said common terminal of said coupled inductor and a terminal of said power source; and
an output circuit coupling said secondary winding of said transformer to a load.
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Abstract
A soft-switched full-bridge pulse-width modulated (“FB PWM”) converter includes a coupled inductor provides ZVS conditions over a wide range of input voltages and output loads. Further, the FB PWM converter of the present invention requires neither a large leakage inductance in the transformer, nor an external inductor, to achieve ZVS.
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Citations
30 Claims
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1. An improved, constant-frequency, phase-shift-controlled full-bridge dc-to-dc converter, comprising:
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first and second pairs of serially-connected controllable switching devices, each pair adapted to connect across a power source, each of said controllable switching device comprising a switch, an antiparallel diode coupled across said switch and a capacitor coupled across said switch;
a coupled inductor having first and second windings, each winding having a first terminal and a second terminal, said second terminals of said first and second windings being connected to form a common terminal of said coupled inductor;
first and second blocking capacitors, said first blocking capacitor being coupled between said first terminal of said first winding of said coupled inductor and a common terminal of said first pair of controllable switching device, and said second blocking capacitor being coupled between said first terminal of said second winding of said coupled inductor and a common terminal of said second pair of controllable switching device;
a transformer having first and second windings, said first winding of transformer being coupled between said common terminal of said coupled inductor and a terminal of said power source; and
an output circuit coupling said secondary winding of said transformer to a load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A pulse-width modulated converter comprising:
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a bridge comprising first and second legs, each of said first and second legs comprising a first and a second switch;
a coupled inductor including a first winding and a second winding coupled by a magnetic core;
a first blocking capacitor coupling said first winding to said first leg of said bridge;
a second blocking capacitor coupling said second winding to said second leg of said bridge;
a transformer having a primary winding and a secondary winding, said primary winding being coupled to both said first and second windings of said coupled inductor; and
an output circuit coupled to said secondary winding of said transformer to provide an output voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for providing a pulse-width modulated converter operating over wide load and input voltage ranges, comprising:
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providing a bridge for receiving an input voltage, said bridge having first and second legs, each of said first and second legs comprising a first and a second switch;
coupling to said first and second legs of said bridge a coupled inductor including a first winding and a second winding coupled by a magnetic core, said first winding being coupled to said first leg of said bridge via a first blocking capacitor, and said second winding being coupled to said second leg of said bridge via a second blocking capacitor;
coupling to both said first and second windings of said coupled inductor a primary winding of a transformer; and
coupling an output circuit to a secondary winding of said transformer to provide an output voltage. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification