Patents by Inventor Hong Fei Bu
Hong Fei Bu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8885371Abstract: Multi-level power converters are disclosed. In one embodiment, a multi-level power converter includes an input for receiving an input voltage and a converter output for providing a variable output voltage. The multi-level power converter includes a plurality of switching circuits. Each switching circuit is connected to the input in parallel with each other switching circuit. Each switching circuit includes an output. Each switching circuit is selectively operable to couple its output to the input voltage or a reference voltage. The multi-level power converter includes a parallel multi-winding autotransformer (PMA). The PMA includes a plurality of windings and a magnetic core having a plurality of magnetically connected columns. Each winding is positioned around a different one of the columns and has a beginning and an end. The output of each switching circuit is coupled to the beginning of a different winding. The end of each winding is connected to the converter output in parallel with each other winding.Type: GrantFiled: April 25, 2011Date of Patent: November 11, 2014Assignee: Astec International LimitedInventors: Piotr Markowski, Lin Guo Wang, Hong Fei Bu
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Patent number: 8742877Abstract: Multi-winding magnetic structures and methods of making multi-winding magnetic structures are disclosed. In one embodiment, a multi-winding magnetic structure includes a core constructed of a magnetic material and a plurality of windings. The core includes a core top, a core bottom, and a plurality of columns. The core top has an exterior edge defining a shape of the core top. A central section of the core top has a substantially constant thickness that defines a thickness of the core top. The core bottom is beneath the core top and has an exterior edge defining a shape of the core bottom. A central section of the core bottom has a substantially constant thickness that defines a thickness of the core bottom. The thickness of one of the core bottom and the core top decreases from an edge of its central section to its exterior edge. The plurality of columns extends from the core bottom to the core top and the plurality of windings are wound around the columns.Type: GrantFiled: October 20, 2010Date of Patent: June 3, 2014Assignee: Astec International LimitedInventors: Piotr Markowski, Lin Guo Wang, Hong Fei Bu, Feng Chuan Gao, Jian Wang
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Publication number: 20130200974Abstract: Multi-winding magnetic structures and methods of making multi-winding magnetic structures are disclosed. A multi-winding magnetic structure includes a plurality of windings (512A, 512B; 612A, 612B, 612C; 712A, 712B; 912A, 912B, 912C; 1012A, 1012B; 1112A, 1112B; 1212A, 1212B; 1412; 1512A, 1512B) and a core (402; 502; 602; 702; 902; 1202; 1402; 1502) formed of a magnetic material. The core includes a core top (408; 508; 608; 708; 908; 1208; 1408; 1508), a core bottom (410; 510; 610; 710; 910; 1210; 1410; 1510) and a plurality of columns (404A, 404B, 404C; 504A, 504B; 604A, 604B, 604C; 704A, 704B; 904A, 90413, 904C; 1204; 1404; 1504). The core top has an exterior edge (1522) defining the shape of the core top and a central section (1516) having a substantially constant thickness. The core bottom which is beneath the core top has an exterior edge (1526) defining the shape of the core bottom and a central section (1518) having a substantially constant thickness.Type: ApplicationFiled: October 20, 2010Publication date: August 8, 2013Applicant: Astec International LimitedInventors: Piotr Markowski, Lin Guo Wang, Hong Fei Bu, Feng Chuan Gao, Jian Wang
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Patent number: 8466765Abstract: Multi-winding magnetic structures and methods of making multi-winding magnetic structures are disclosed. In one embodiment, a multi-winding magnetic structure includes a core constructed of a magnetic material and a plurality of windings. The core includes a core top, a core bottom, and a plurality of columns. The core top has an exterior edge defining a shape of the core top. A central section of the core top has a substantially constant thickness that defines a thickness of the core top. The core bottom is beneath the core top and has an exterior edge defining a shape of the core bottom. A central section of the core bottom has a substantially constant thickness that defines a thickness of the core bottom. The thickness of one of the core bottom and the core top decreases from an edge of its central section to its exterior edge. The plurality of columns extends from the core bottom to the core top and the plurality of windings are wound around the columns.Type: GrantFiled: April 26, 2011Date of Patent: June 18, 2013Assignee: Astec International LimitedInventors: Piotr Markowski, Lin Guo Wang, Hong Fei Bu, Feng Chuan Gao, Jian Wang
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Publication number: 20120098632Abstract: Multi-winding magnetic structures and methods of making multi-winding magnetic structures are disclosed. In one embodiment, a multi-winding magnetic structure includes a core constructed of a magnetic material and a plurality of windings. The core includes a core top, a core bottom, and a plurality of columns. The core top has an exterior edge defining a shape of the core top. A central section of the core top has a substantially constant thickness that defines a thickness of the core top. The core bottom is beneath the core top and has an exterior edge defining a shape of the core bottom. A central section of the core bottom has a substantially constant thickness that defines a thickness of the core bottom. The thickness of one of the core bottom and the core top decreases from an edge of its central section to its exterior edge. The plurality of columns extends from the core bottom to the core top and the plurality of windings are wound around the columns.Type: ApplicationFiled: April 26, 2011Publication date: April 26, 2012Applicant: Astec International LimitedInventors: Piotr Markowski, Lin Guo Wang, Hong Fei Bu, Feng Chuan Gao, Jian Wang
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Publication number: 20120092908Abstract: Multi-level power converters are disclosed. In one embodiment, a multi-level power converter includes an input for receiving an input voltage and a converter output for providing a variable output voltage. The multi-level power converter includes a plurality of switching circuits. Each switching circuit is connected to the input in parallel with each other switching circuit. Each switching circuit includes an output. Each switching circuit is selectively operable to couple its output to the input voltage or a reference voltage. The multi-level power converter includes a parallel multi-winding autotransformer (PMA). The PMA includes a plurality of windings and a magnetic core having a plurality of magnetically connected columns. Each winding is positioned around a different one of the columns and has a beginning and an end. The output of each switching circuit is coupled to the beginning of a different winding. The end of each winding is connected to the converter output in parallel with each other winding.Type: ApplicationFiled: April 25, 2011Publication date: April 19, 2012Applicant: Astec International LimitedInventors: Markowski Piotr, Lin Guo Wang, Hong Fei Bu