公开(公告)号：US10476372B2

公开(公告)日：2019-11-12

申请号：US14579644

申请日：2014-12-22

Applicant: Futurewei Technologies, Inc.

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

IPC: H02M3/158 ,  H02M1/14 ,  H02M1/44 ,  H02M1/00

Abstract: A method comprises detecting an input voltage and an output voltage of a buck-boost converter, wherein the buck-boost converter comprises a first high-side switch and a first low-side switch connected in series across an input capacitor, a second high-side switch and a second low-side switch connected in series across an output capacitor and an inductor coupled between a common node of the first high-side switch and the first low-side switch, and a common node of the second high-side switch and the second low-side switch and configuring the buck-boost converter such that at least one of the first high-side switch and second low-side switch operates at a fixed duty cycle mode.

公开(公告)号：US20190123650A1

公开(公告)日：2019-04-25

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: H02M3/158

CPC classification number: H02M3/1582 ,  H02M2001/0025 ,  H02M2001/0032 ,  H02M2001/0058 ,  Y02B70/1425 ,  Y02B70/1491 ,  Y02B70/16

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：US10199947B2

公开(公告)日：2019-02-05

申请号：US15479885

申请日：2017-04-05

Applicant: Futurewei Technologies, Inc.

Inventor： Liming Ye ,  Heping Dai ,  Dianbo Fu

IPC: H02M3/335

Abstract: In an Input-Series-Output-Parallel (ISOP)-type power converter circuit, a DC-to-DC converter has a positive input coupled to a DC power source and a negative input connected to a negative output. A plurality of capacitors are coupled in series between a positive output of the converter and a circuit ground, the negative output of the converter coupled to a common node of first and second capacitors. A half-bridge inverter network is coupled between the positive output and a circuit ground, each inverter having an input respectively coupled to the first capacitor and the second capacitor. A plurality of resonant tanks are coupled to an output of a respective one of first and second half-bridge inverters. A transformer is coupled to outputs of the plurality of resonant tanks. A rectifier circuit is coupled to a secondary winding of the transformer to provide a DC output voltage.

公开(公告)号：US10116219B2

公开(公告)日：2018-10-30

申请号：US15263121

申请日：2016-09-12

Applicant: Futurewei Technologies, Inc.

Inventor： Daoshen Chen ,  Heping Dai ,  Xujun Liu ,  Zhihua Liu ,  Liming Ye ,  Dianbo Fu ,  Ce Liu ,  Bing Cai

IPC: H02M3/335 ,  H02M3/22 ,  H02M3/156 ,  H02M3/325 ,  H02M3/337 ,  H02M1/14 ,  H02M1/00

Abstract: A method comprises connecting a first resonant converter and a second resonant converter in parallel, detecting a first signal indicating a first soft switching process of the first resonant converter and a second signal indicating a second soft switching process of the second resonant converter and adjusting a first switching frequency of the first resonant converter by a first control circuit and a second switching frequency of the second resonant converter by a second control circuit until a load current flowing through the first resonant converter is substantially equal to a load current flowing through the second resonant converter.

公开(公告)号：US20180234022A1

公开(公告)日：2018-08-16

申请号：US15954424

申请日：2018-04-16

Applicant: Futurewei Technologies, Inc.

Inventor： Liming Ye ,  Heping Dai ,  Dianbo Fu

IPC: H02M3/335 ,  H02M7/483 ,  H02M1/00

CPC classification number: H02M3/33576 ,  H02M7/483 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A converter is provided. The converter includes a first DC/DC converter, a non-isolated DC/DC converter and a control circuit. The first DC/DC converter includes a transformer, a primary side inverter and a secondary side rectifier. The primary side inverter and a secondary side rectifier are operable at multiple operating modes. The control circuit determines an operating mode for the primary side inverter or the secondary side rectifier, and controls the primary side inverter or the secondary side rectifier to change its respective operating mode.

公开(公告)号：US20180183347A1

公开(公告)日：2018-06-28

申请号：US15635705

申请日：2017-06-28

Applicant: Futurewei Technologies, Inc.

Inventor： Liming Ye ,  Heping Dai ,  Dianbo Fu

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33592 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/0074 ,  H02M2001/0093 ,  Y02B70/1433 ,  Y02B70/1475

Abstract: An Input-Series-Output-Parallel (ISOP)-type partial power converter circuit comprises: an isolated, unregulated DC-to-DC converter configured to generate a first output voltage at a first output voltage node; and a regulated DC-to-DC converter coupled with the unregulated DC-to-DC converter and configured to generate a second output voltage at a second output voltage node, the regulated DC-to-DC converter comprising a resonant forward-flyback converter configuration; wherein the first output voltage node is coupled in parallel with the second output voltage node.

公开(公告)号：US20180102713A1

公开(公告)日：2018-04-12

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 ,  H02M1/00 ,  H02M7/48 ,  H02M1/088

CPC classification number: H02M3/33546 ,  H02M1/08 ,  H02M1/088 ,  H02M1/14 ,  H02M1/36 ,  H02M3/3353 ,  H02M3/33553 ,  H02M3/33576 ,  H02M3/33592 ,  H02M3/3385 ,  H02M7/4807 ,  H02M2001/0006 ,  H02M2001/0058 ,  H02M2007/4818 ,  Y02B70/1433 ,  Y02B70/1441 ,  Y02B70/1491 ,  Y02P80/112

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：US20200266720A1

公开(公告)日：2020-08-20

申请号：US16865762

申请日：2020-05-04

Applicant: Futurewei Technologies, Inc.

Inventor： Yushan Li ,  Liming Ye ,  Heping Dai

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/40

Abstract: An apparatus includes a pulse-width modulation (PWM) generator configured to generate a PWM signal for controlling a power switch of a power converter, a bias switch and a bias capacitor connected in series and coupled to a magnetic winding of the power converter and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the magnetic winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.

公开(公告)号：US10284097B2

公开(公告)日：2019-05-07

申请号：US16173904

申请日：2018-10-29

Applicant: Futurewei Technologies, Inc.

Inventor： Daoshen Chen ,  Heping Dai ,  Xujun Liu ,  Zhihua Liu ,  Liming Ye ,  Dianbo Fu ,  Ce Liu ,  Bing Cai

IPC: H02M3/156 ,  H02M3/22 ,  H02M3/335 ,  H02M3/337 ,  H02M3/325 ,  H02M1/14 ,  H02M1/00

Abstract: A system comprises an input power stage coupled to a primary side of a transformer, an output power stage coupled to a secondary side of a transformer, a first common node capacitor and a common node resistor connected in series between a midpoint of the secondary side of the transformer and ground and a detector having an input connected to a common node of the first common node capacitor and the common node resistor, and an output connected to a control circuit, wherein the control circuit is configured to dynamically adjust a switching frequency of the system based upon an output of the detector.

公开(公告)号：US10177661B2

公开(公告)日：2019-01-08

申请号：US14739827

申请日：2015-06-15

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 comprises generating a first ramp signal and a second ramp signal for controlling a buck converter portion and a boost converter portion of a buck-boost converter respectively, comparing the first ramp signal and the second ramp signal to a control signal, controlling the buck converter portion using the comparing the first ramp signal to the control signal and the boost converter portion using the comparing the second ramp signal to the control signal, comparing a current flowing through the inductor to a current threshold and terminating a switching cycle based upon the comparing the current flowing through the inductor to the current threshold.