公开(公告)号：US20200176991A1

公开(公告)日：2020-06-04

申请号：US16780293

申请日：2020-02-03

Applicant: Futurewei Technologies, Inc.

Inventor： Heping Dai ,  Xiaolin Mao ,  Dianbo Fu ,  Huibin Zhu

IPC: H02J3/38 ,  H02S50/00 ,  H02S50/10

Abstract: An apparatus includes a four-switch power converter having input terminals coupled to a power source and output terminals coupled to a capacitor, wherein the capacitor is connected in series with the power source, and a common node of the capacitor and the power source is connected to one input terminal of the four-switch power converter.

公开(公告)号：US10673246B2

公开(公告)日：2020-06-02

申请号：US15829846

申请日：2017-12-01

Applicant: Futurewei Technologies, Inc.

Inventor： Xiaolin Mao ,  Heping Dai ,  Dianbo Fu ,  Huibin Zhu

IPC: H02J3/38 ,  G05F1/67 ,  H02M7/487 ,  H02M1/00 ,  H02M3/158 ,  H02M7/49 ,  H02M7/5387

Abstract: System, device and method for exporting power are provided including at least one AC optimizer with plurality of DC inputs each connecting with respective one of plurality of DC sources, and independent maximum power point tracking (MPPT) performed for each respective DC source to extract power from each DC source for output and coupling to AC grid. When multiple AC optimizers are employed, with each AC optimizer having multiple DC inputs, each DC input can be connected to PV module with independent MPPT function. Since, each AC optimizer can serve multiple PV modules, significant cost saving and efficiencies can be achieved. Optionally, on PV sub-module level, each of the multiple DC inputs can be used as an independent MPPT channel for a PV sub-module cell string.

公开(公告)号：US10554141B2

公开(公告)日：2020-02-04

申请号：US15477504

申请日：2017-04-03

Applicant: Futurewei Technologies, Inc.

Inventor： Heping Dai ,  Liming Ye ,  Dianbo Fu ,  Daoshen Chen

IPC: H02M3/337 ,  H02M3/07 ,  H02M3/158 ,  H02M3/18 ,  H02M3/335 ,  H02M1/00

Abstract: An apparatus comprises an isolated power converter coupled to an input dc power source, wherein the isolated power converter comprises a first switch network coupled to a first transformer winding and a second switch network coupled to a second transformer winding and a non-isolated power converter coupled to the second switch network of the isolated power converter, wherein a current flowing through the non-isolated power converter is a fraction of a current flowing through the isolated power converter.

公开(公告)号：US10554130B2

公开(公告)日：2020-02-04

申请号：US16212943

申请日：2018-12-07

Applicant: Futurewei Technologies, Inc.

Inventor： Liming Ye ,  Jinbo Huang ,  Heping Dai ,  Dianbo Fu ,  Daoshen Chen

IPC: G05F1/10 ,  H02M3/158 ,  H02M1/00

Abstract: A method includes generating a first ramp signal for controlling a first portion of a converter, generating a second ramp signal for controlling a second portion of the converter, controlling a state of a first switch of the first portion through comparing the first ramp signal to a control signal and a state of a first switch of the second portion through comparing the second ramp signal to the control signal and determining a switching cycle of the converter through comparing a current flowing through an inductor of the converter to a threshold.

公开(公告)号：US10554128B2

公开(公告)日：2020-02-04

申请号：US15863002

申请日：2018-01-05

Applicant: Futurewei Technologies, Inc.

Inventor： Bo Yu ,  Jinxiang Zhan ,  Dianbo Fu

IPC: H02M3/158 ,  H02M3/07 ,  H02M1/32 ,  H02M1/36 ,  H02M1/00

Abstract: A DC to DC converter uses a multi-level boost converter topology. In addition to the input voltage being connected to an output node through a boost inductor in series with a pair of diodes, a bridge circuit generates a multi-level waveform on one side of flying capacitor, which is on the other side connected between the series connected diodes. The boost converter topology maintains low voltage stress on its components under abnormal conditions on the output node and allows for simple pre-charging of the flying capacitor.

公开(公告)号：US10389135B2

公开(公告)日：2019-08-20

申请号：US15795794

申请日：2017-10-27

Applicant: Futurewei Technologies, Inc.

Inventor： Dianbo Fu ,  Bo He ,  Quan Li

IPC: H02M7/537 ,  H02M7/487 ,  H02M7/5387 ,  H02J3/38 ,  H02M3/156 ,  H02M3/158 ,  H02M1/00

Abstract: A system comprises a five-level rectifier configured to be connected with an ac power source, wherein the five-level rectifier comprises a first boost apparatus and a first buck apparatus configured to operate in a first half cycle of the ac power source, and a second boost apparatus and a second buck apparatus configured to operate in a second half cycle of the ac power source and a five-level inverter connected to the five-level rectifier.

公开(公告)号：US10340807B2

公开(公告)日：2019-07-02

申请号：US15838745

申请日：2017-12-12

Applicant: Futurewei Technologies, Inc.

Inventor： Daoshen Chen ,  Heping Dai ,  Xujun Liu ,  Liming Ye ,  Dianbo Fu

IPC: H02M3/335 ,  H02M1/08 ,  H02M3/338 ,  H02M1/14 ,  H02M1/36 ,  H02M1/088 ,  H02M1/00 ,  H02M7/48

Abstract: A device comprises a gate drive bridge coupled between a bias voltage of a power converter and ground and a transformer connected to the gate drive bridge, wherein the transformer comprises a primary winding connected to two legs of the gate drive bridge respectively and a plurality of secondary windings configured to generate gate drive signals for low side switches, high side switches and secondary switches of the power converter.

公开(公告)号：US20180331540A1

公开(公告)日：2018-11-15

申请号：US15594231

申请日：2017-05-12

Applicant: Futurewei Technologies, Inc.

Inventor： Xiaolin Mao ,  Heping Dai ,  Huibin Zhu ,  Dianbo Fu

IPC: H02J3/38 ,  H02M7/44 ,  H02J13/00 ,  H02M3/04 ,  H02M1/084

Abstract: A direct current (DC) bus voltage from a combined output of a plurality of DC power modules is controlled based on an alternating current (AC) voltage of a power grid. The DC bus voltage tracks the AC grid voltage to provide efficient conversion between the DC power sources and the AC grid, even when the amplitude of the AC grid voltage varies. In one example, a variable reference voltage is generated based on a detected AC grid voltage. The reference voltage increases and decreases in proportion to increases and decreases in the AC grid voltage. In this manner, large differences between the bus voltage and the grid voltage are avoided. By closely tracking the two voltages, efficiency in the modulation index for power conversion can be achieved.

公开(公告)号：US09960708B2

公开(公告)日：2018-05-01

申请号：US15136836

申请日：2016-04-22

Applicant: Futurewei Technologies, Inc.

Inventor： Dianbo Fu

IPC: H02M7/483 ,  H02M7/487 ,  H02M7/44

CPC classification number: H02M7/487 ,  H02M7/44 ,  H02M7/53871

Abstract: An inverter apparatus and method are provided for converting direct current to alternating current. The inverter circuit includes a first switch sub-circuit configured for electrical communication with a power source and switching at a first frequency. The inverter circuit further includes a second switch sub-circuit in electrical communication with the first switch sub-circuit. The second switch sub-circuit is configured for electrical communication with a load and switching at a second frequency different from the first frequency.

公开(公告)号：US09923485B2

公开(公告)日：2018-03-20

申请号：US14933723

申请日：2015-11-05

Applicant: Futurewei Technologies, Inc.

Inventor： Dianbo Fu ,  Yunfeng Liu

IPC: H02M7/537 ,  H02M7/487 ,  H02M7/49

CPC classification number: H02M7/537 ,  H02M7/487 ,  H02M7/49

Abstract: A system comprises a first T-type inverter connected to a dc power source, a second T-type inverter connected to the dc power source, wherein the second T-type inverter is configured to operate with a first phase shift from the first T-type inverter, a third T-type inverter connected to the dc power source, wherein the third T-type inverter is configured to operate with a second phase shift from the second T-type inverter, a coupled inductor having a first input, a second input and a third input connected to the first T-type inverter, the second T-type inverter and the third T-type inverter respectively and an output filter coupled to the output of the coupled inductor.