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公开(公告)号：US11968765B2
公开(公告)日：2024-04-23
申请号：US16657472
申请日：2019-10-18
Inventor： Jeremiah Kopiness , Andrew Amrhein , Jong-Woo Kim , Moonhyun Lee , Jih-Sheng Lai
CPC classification number: H05B6/062 , H02M1/0009 , H02M7/53871 , H03L5/00 , H05B6/1209 , H02M7/4815 , Y02B70/10
Abstract: The present disclosure describes devices and methods for improving the power efficiency and control of an induction heating system. In particular, the induction heating system includes a series resonant bridge inverter circuit and a control circuit. The inverter circuit includes one or more induction coils that are structured to inductively couple to the cookware to heat the cookware and a current sensor structured to sense a coil current signal across the one or more inductor coils. In particular, the current sensor is structured to generate a positive sensed voltage signal corresponding to a positive portion of the coil current signal and a negative sensed voltage signal corresponding to a negative portion of the coil current. The control signal is structured to control switching of a first and a second set of switches based on the positive and negative sensed voltage signals.
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公开(公告)号：US20220385193A1
公开(公告)日：2022-12-01
申请号：US17765611
申请日：2020-09-30
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Jih-Sheng Lai , Chih-Shen Yeh
IPC: H02M3/335 , H02M3/00 , H02M1/08 , H02M1/00 , H02M7/5387
Abstract: Aspects of hybrid modulation control for DC-to-AC converters are described. In one embodiment, a hybrid modulation pattern is generated. The hybrid modulation pattern separates switch gating control into multiple control regions for a half cycle of the waveform. A first control region modulates according to a first modulation technique and a second control region modulates according to a second modulation technique. The switches of a resonant converter are controlled according to the hybrid modulation pattern to generate the waveform.
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公开(公告)号：US12034376B2
公开(公告)日：2024-07-09
申请号：US17765611
申请日：2020-09-30
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Jih-Sheng Lai , Chih-Shen Yeh
IPC: H02M3/335 , H02M1/00 , H02M1/08 , H02M3/00 , H02M7/5387
CPC classification number: H02M3/33573 , H02M1/0058 , H02M1/08 , H02M3/01 , H02M3/33576 , H02M7/5387
Abstract: Aspects of hybrid modulation control for DC-to-AC converters are described. In one embodiment, a hybrid modulation pattern is generated. The hybrid modulation pattern separates switch gating control into multiple control regions for a half cycle of the waveform. A first control region modulates according to a first modulation technique and a second control region modulates according to a second modulation technique. The switches of a resonant converter are controlled according to the hybrid modulation pattern to generate the waveform.
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公开(公告)号：US11990849B2
公开(公告)日：2024-05-21
申请号：US17587405
申请日：2022-01-28
Applicant: Virginia Tech Intellectual Properties, Inc.
Inventor： Jih-Sheng Lai , Moonhyun Lee
CPC classification number: H02M7/4835 , H02M1/0095 , H02M3/33573 , H02M7/53871 , H02M5/453 , H02M5/458 , H02M5/4585 , H02M7/483 , H02M7/49
Abstract: This disclosure provides systems, methods, and apparatus for multi-level inverters. A hybrid binary cascaded multilevel inverter (BCMLI) is discussed that includes a plurality of H-bridge cells connected in a cascaded formation. DC input voltages of some of the H-bridge cells are provided by DC voltage sources. But inputs of other H-bridge cells coupled with capacitors instead. The H-bridge cells are operated to provide an AC output voltage at the output terminals of the inverter. One or more floating capacitor voltage controllers are used to vary one or more switching instances of the H-bridge cells such that a desirable level or charge is maintained across the one or more capacitors coupled with the input terminals of the H-bridge cells.
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