Patent ID: 9148064
Filing Date: 2015-09-29
Classification: H02M,Y02B

Abstract:
1. A multi-phase switching power conversion circuit comprising: a first switching circuit having a first output; a second switching circuit having a second output; a third switching circuit having a third output; a first phase branch that is connected between the first output and a resonant common terminal, the first phase branch comprising a plurality of components including at least one capacitor and at least one inductor connected in series between the first output and the resonant common terminal; a second phase branch that is connected between the second output and the resonant common terminal, the second phase branch comprising a plurality of components including at least one capacitor and at least one inductor connected in series between the second output and the resonant common terminal; a third phase branch that is connected between the third output and the resonant common terminal, the third phase branch comprising a plurality of components including at least one capacitor and at least one inductor connected in series between the third output and the resonant common terminal such that the first, second, and third phase branches form a star connection with the resonant common terminal forming a neutral point of the star connection; a first primary winding magnetically coupled to a first secondary winding, the first primary winding being connected in parallel with one or more of the components of the first phrase branch; a second primary winding magnetically coupled to a second secondary winding, the second primary winding being connected in parallel with one or more of the components of the second phrase branch; and a third primary winding magnetically coupled to a third secondary winding, the third primary winding being connected in parallel with one or more of the components of the third phrase branch; wherein the first, second, and third secondary windings are connected to an output terminal; wherein each switching circuit comprises: a first switch having a first terminal connected to a positive terminal of an input voltage source, a second terminal connected to a first terminal of a second switch, and a control terminal connected to a control circuit; the second switch having the first terminal connected to the second terminal of the first switch, a second terminal connected to the respective phase branch, and a control terminal connected to the control circuit; a third switch having a first terminal connected to a reference terminal of the input voltage source, a second terminal connected to a first terminal of a fourth switch, and a control terminal connected to the control circuit; the fourth switch having the first terminal connected to the second terminal of the third switch, a second terminal connected to the respective phase branch, and a control terminal connected to the control circuit; a first voltage division capacitor connected between a phase connecting terminal and the first terminal of the first switch; a second voltage division capacitor connected between the phase connecting terminal and the first terminal of the third switch; a first rectifier diode connected between the phase connecting terminal and the second terminal of the first switch; a second rectifier diode connected between the phase connecting terminal and the second terminal of the third switch; and a phase capacitor connected between the second terminal of the first switch and the second terminal of the third switch.