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公开(公告)号：US11307266B2
公开(公告)日：2022-04-19
申请号：US17006058
申请日：2020-08-28
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Minh Ngo , Dong Dong , Rolando Burgos
Abstract: Various examples of a high frequency, inductor and transformer core loss characterization and measurement method and system for arbitrary waveforms are disclosed herein. A system and method for determining core loss of a magnetic core can include generating a waveform to excite a first test circuit which comprises an excitation circuit, a circuit under test (CUT) comprising the magnetic core, and an inductance circuit having an inductor connected in parallel to the CUT. The method includes measuring a first current, when the first test circuit is excited. The method includes disconnecting the CUT from the first test circuit to form a second test circuit. The method includes generating the waveform to excite the second test circuit, and measuring a second current, when the second test circuit is excited. The power loss for the magnetic core is calculated based on an input voltage and the first and second measured current.
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公开(公告)号：US11290022B2
公开(公告)日：2022-03-29
申请号：US17008893
申请日：2020-09-01
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Minh Ngo , Ning Yan , Dong Dong , Rolando Burgos
IPC: H02M3/335 , H02M7/5387 , H02M1/00
Abstract: Aspects of bidirectional architectures with partial energy processing in resonant direct current (DC)-to-DC converters are described. In one embodiment, an alternating circuit (AC)-to-DC circuit generates an AC voltage from a DC voltage. A voltage of the AC voltage is transformed into a majority AC voltage of a majority power path and at least one minority AC voltage of the minority power paths. The majority AC voltage is rectified into a majority DC voltage and a minority AC voltage is rectified into a minority DC voltage. The majority power path and the minority power path are combined as a combined DC voltage.
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公开(公告)号：US20240097572A1
公开(公告)日：2024-03-21
申请号：US17932399
申请日：2022-09-15
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Yijie Bai , Vladimir Mitrovic , Boran Fan , Dong Dong , Rolando Burgos
CPC classification number: H02M3/33573 , H02M1/08
Abstract: Power systems including converters that exhibit reduced common mode voltage emissions are described. In one example, a power converter system includes an input and an output, a multi-level switch bridge coupled between the input and the output, an input capacitor branch coupled across the input, an output capacitor branch coupled across the output, and a controller configured to generate switching control signals for the multi-level buck-boost switch bridge. The multi-level switch bridge also includes a plurality of inductors in one example. In one case, a quadrangular or quadrangle control mode can be relied upon to switch the multi-level switch bridge, to minimize the ripple in the inductors, achieve zero voltage switching, reduce common mode electromagnetic interference emission by the converter, and for other benefits.
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公开(公告)号：US20220069719A1
公开(公告)日：2022-03-03
申请号：US17008893
申请日：2020-09-01
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Minh Ngo , Ning Yan , Dong Dong , Rolando Burgos
IPC: H02M3/335 , H02M7/5387
Abstract: Aspects of bidirectional architectures with partial energy processing in resonant direct current (DC)-to-DC converters are described. In one embodiment, an alternating circuit (AC)-to-DC circuit generates an AC voltage from a DC voltage. A voltage of the AC voltage is transformed into a majority AC voltage of a majority power path and at least one minority AC voltage of the minority power paths. The majority AC voltage is rectified into a majority DC voltage and a minority AC voltage is rectified into a minority DC voltage. The majority power path and the minority power path are combined as a combined DC voltage.
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Patent Agency Ranking
公开(公告)号：US12132408B2
公开(公告)日：2024-10-29
申请号：US17819353
申请日：2022-08-12
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Dong Dong
CPC classification number: H02M3/33584 , H02M1/088 , H02M3/01 , H02M3/33576 , H02M3/33592
Abstract: Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. In one example, a power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer (EET) between the first and second bridge. The EET includes a capacitor and a capacitance coupling switch bridge. The controller generates switching control signals for the first and second bridges and phasing drive control signals for the capacitance coupling switch bridge in the EET. The controller applies a phase shift to the phasing drive control signals for the EET as compared to the switching control signals for the first and second bridges, so that the voltage across the capacitor in the EET cancels the leakage inductance of the transformer windings in the EET, at any switching frequency.
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公开(公告)号：US20250047206A1
公开(公告)日：2025-02-06
申请号：US18364088
申请日：2023-08-02
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Dong Dong
Abstract: Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer (EET) between the first and second bridge. The EET includes a capacitor and a capacitance coupling switch bridge. The controller generates phasing drive control signals for trapezoidal current modulation control of the capacitance coupling switch bridge of the EET. The controller is configured to generate the phasing drive control signals based on a phase shift coefficient, k, to set a duty cycle of a voltage from the capacitance coupling switch bridge. The controller is also configured to vary k from between 0 to 0.5 based on a load applied to the power converter system or other operating aspects of the power converter.
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公开(公告)号：US20250047188A1
公开(公告)日：2025-02-06
申请号：US18364113
申请日：2023-08-02
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Dong Dong
Abstract: Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer between the first and second bridge. The electronic-embedded transformer includes a bidirectional coupling switch bridge. The controller generates drive control signals for quasi-trapezoidal current modulation control of the bidirectional coupling switch bridge. The controller is configured to generate the drive control signals based on a commutation coefficient k and a switching frequency for the power converter. The commutation coefficient k can be set based on an inductance in the electronic-embedded transformer, a capacitance in the bidirectional coupling switch bridge, and a margin for resonant current commutation.
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公开(公告)号：US20240055996A1
公开(公告)日：2024-02-15
申请号：US17819353
申请日：2022-08-12
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Dong Dong
CPC classification number: H02M3/33584 , H02M3/01 , H02M1/088
Abstract: Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. In one example, a power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer (EET) between the first and second bridge. The EET includes a capacitor and a capacitance coupling switch bridge. The controller generates switching control signals for the first and second bridges and phasing drive control signals for the capacitance coupling switch bridge in the EET. The controller applies a phase shift to the phasing drive control signals for the EET as compared to the switching control signals for the first and second bridges, so that the voltage across the capacitor in the EET cancels the leakage inductance of the transformer windings in the EET, at any switching frequency.
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公开(公告)号：US20220065950A1
公开(公告)日：2022-03-03
申请号：US17006058
申请日：2020-08-28
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Yuliang Cao , Minh Ngo , Dong Dong , Rolando Burgos
Abstract: Various examples of a high frequency, inductor and transformer core loss characterization and measurement method and system for arbitrary waveforms are disclosed herein. A system and method for determining core loss of a magnetic core can include generating a waveform to excite a first test circuit which comprises an excitation circuit, a circuit under test (CUT) comprising the magnetic core, and an inductance circuit having an inductor connected in parallel to the CUT. The method includes measuring a first current, when the first test circuit is excited. The method includes disconnecting the CUT from the first test circuit to form a second test circuit. The method includes generating the waveform to excite the second test circuit, and measuring a second current, when the second test circuit is excited. The power loss for the magnetic core is calculated based on an input voltage and the first and second measured current.
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