公开(公告)号：US20190074774A1

公开(公告)日：2019-03-07

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

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：US20190044449A1

公开(公告)日：2019-02-07

申请号：US15819209

申请日：2017-11-21

Applicant: Futurewei Technologies, Inc.

Inventor： Yushan Li ,  Liming Ye ,  Heping Dai

IPC: H02M3/335 ,  H02M1/08

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：US09812968B2

公开(公告)日：2017-11-07

申请号：US14548106

申请日：2014-11-19

Applicant: Futurewei Technologies, Inc.

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

IPC: H02M3/158 ,  H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M3/158 ,  H02M3/1582 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1425 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A converter comprises a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches, a magnetic device coupled to the switch network, a detector coupled to the magnetic device through a magnetic coupling and a control circuit configured to receive a zero voltage switching signal from the detector and adjust gate drive signals of the power switches based upon the zero voltage switching signal.

公开(公告)号：US20170077815A1

公开(公告)日：2017-03-16

申请号：US14850125

申请日：2015-09-10

Applicant: Futurewei Technologies, Inc.

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

IPC: H02M3/158

CPC classification number: H02M3/1582 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A method comprises providing a buck-boost converter comprising 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, detecting a first voltage resonance waveform across a switch of the buck-boost converter and turning on the switch of the buck-boost converter when the first voltage resonance waveform falls to zero.

Abstract translation: 一种方法包括提供降压 - 升压转换器，其包括跨输入电容器串联连接的第一高侧开关和第一低侧开关，第二高侧开关和第二低侧开关串联连接在输出端 电容器和耦合在第一高侧开关的公共节点和第一低侧开关之间的电感器以及第二高侧开关和第二低侧开关的公共节点，检测第一高压侧开关的第一电压共振波形 降压 - 升压转换器的开关，并且当第一电压共振波形下降到零时，导通降压 - 升压转换器的开关。

公开(公告)号：US20160380547A1

公开(公告)日：2016-12-29

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 ,  H02M1/14

CPC classification number: H02M3/33507 ,  H02M1/14 ,  H02M3/156 ,  H02M3/22 ,  H02M3/325 ,  H02M3/33523 ,  H02M3/33569 ,  H02M3/33576 ,  H02M3/33592 ,  H02M3/337 ,  H02M3/3376 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

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.

Abstract translation: 一种方法包括并联连接第一谐振转换器和第二谐振转换器，检测指示第一谐振转换器的第一软开关处理的第一信号和指示第二谐振转换器的第二软开关处理的第二信号， 通过第二控制电路通过第一控制电路和第二谐振变换器的第二开关频率使第一谐振变换器的开关频率直到流过第一谐振变换器的负载电流基本上等于流经第二谐振变换器的负载电流 。

公开(公告)号：US20160190946A1

公开(公告)日：2016-06-30

申请号：US15061717

申请日：2016-03-04

Applicant: Futurewei Technologies, Inc.

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

IPC: H02M3/335

CPC classification number: H02M3/33546 ,  H02M3/33576 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A method comprises detecting a signal representing a drain-to-source voltage of a switch of a synchronous rectifier of an inductor-inductor-capacitor (LLC) resonant converter, comparing the signal with a predetermined threshold, generating a first logic state if the drain-to-source voltage is greater than the predetermined threshold, generating a second logic state if the drain-to-source voltage is less than the predetermined threshold and in response to the first logic state and the second logic state, adjusting a switching frequency of the LLC resonant converter such that the switching frequency moves back and forth across a boundary of body diode conduction, wherein a frequency difference between the switching frequency and a resonant frequency of the LLC resonant converter is less than or equal to one frequency adjustment step.

Abstract translation: 一种方法包括检测表示电感器 - 电感器 - 电容器（LLC）谐振转换器的同步整流器的开关的漏极 - 源极电压的信号，将该信号与预定阈值进行比较，如果漏极 - 源极电压大于预定阈值时，如果漏极 - 源极电压小于预定阈值并且响应于第一逻辑状态和第二逻辑状态，则产生第二逻辑状态，调整开关频率 所述LLC谐振变换器使得所述开关频率在体二极管导通的边界上来回移动，其中所述LLC谐振转换器的开关频率和谐振频率之间的频率差小于或等于一个频率调整步骤。

公开(公告)号：US20160094136A1

公开(公告)日：2016-03-31

申请号：US14502196

申请日：2014-09-30

Applicant: Futurewei Technologies, Inc.

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

IPC: H02M3/335

CPC classification number: H02M3/33584 ,  H02M3/1582 ,  H02M2001/0058 ,  H02M2001/007 ,  Y02B70/1425 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A converter comprises a non-isolated stage coupled to an input dc power source, wherein the non-isolated stage is configured to operate at a buck converter mode in response to a first input voltage and operate at a boost converter mode in response to a second input voltage, a resonant stage coupled between the non-isolated stage and a load, wherein the resonant stage is configured to operate at a resonant mode and a capacitor coupled between the non-isolated stage and the resonant stage.

Abstract translation: A转换器包括耦合到输入直流电源的非隔离级，其中所述非隔离级被配置为响应于第一输入电压在降压转换器模式下操作并响应于第二输入电压在升压转换器模式下操作 输入电压，耦合在所述非隔离级与负载之间的谐振级，其中所述谐振级被配置为在谐振模式下工作，以及耦合在所述非隔离级与所述谐振级之间的电容器。

公开(公告)号：US20150124492A1

公开(公告)日：2015-05-07

申请号：US14071446

申请日：2013-11-04

Applicant: FutureWei Technologies, Inc.

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

IPC: H02M3/335

CPC classification number: H02M3/33546 ,  H02M3/33576 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A method comprises providing a resonant converter, wherein the resonant converter comprises an input switch network coupled to a power source, wherein the input switch network comprises a plurality of power switches, a resonant tank coupled to the plurality of power switches, a transformer coupled to the resonant tank and an output stage coupled to the transformer, wherein the output stage comprises a synchronous rectifier formed by a first switch and a second switch, detecting a drain voltage of the first switch, comparing the drain voltage with a predetermined voltage threshold, wherein the drain voltage is coupled to a negative input of a comparator and the predetermined voltage threshold is coupled to a positive input of the comparator, generating a logic state based upon an output of the comparator and adjusting, by a control circuit, a switching frequency of the resonant converter based upon the logic state.

Abstract translation: 一种方法包括提供谐振转换器，其中所述谐振转换器包括耦合到电源的输入开关网络，其中所述输入开关网络包括多个功率开关，耦合到所述多个功率开关的谐振槽，耦合到 所述谐振槽和耦合到所述变压器的输出级，其中所述输出级包括由第一开关和第二开关形成的同步整流器，检测所述第一开关的漏极电压，将所述漏极电压与预定电压阈值进行比较，其中 漏极电压耦合到比较器的负输入，并且预定电压阈值耦合到比较器的正输入，基于比较器的输出产生逻辑状态，并通过控制电路调整开关频率 基于逻辑状态的谐振转换器。

公开(公告)号：US20150124489A1

公开(公告)日：2015-05-07

申请号：US14074246

申请日：2013-11-07

Applicant: FutureWei Technologies, Inc.

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

IPC: H02M3/335 ,  G01R19/00

CPC classification number: H02M3/335 ,  H02M3/3353 ,  H02M3/33538 ,  H02M3/33576 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: An apparatus comprises a magnetic device coupled to an inductor-inductor-capacitor (LLC) resonant converter, an ac current sensing circuit coupled to the magnetic device, an average current sensing circuit coupled to the ac current sensing circuit and a reference voltage source coupled to the average current sensing circuit, wherein the reference voltage source is configured such that a magnitude of an average signal from the average current sensing circuit is greater than a voltage level of the reference voltage source.

Abstract translation: 一种装置包括耦合到电感器 - 电感器 - 电容器（LLC）谐振转换器的磁性装置，耦合到磁性装置的交流电流检测电路，耦合到交流电流检测电路的平均电流检测电路和耦合到 平均电流感测电路，其中参考电压源被配置为使得来自平均电流感测电路的平均信号的幅度大于参考电压源的电压电平。

公开(公告)号：US20150109824A1

公开(公告)日：2015-04-23

申请号：US14056532

申请日：2013-10-17

Applicant: FutureWei Technologies, Inc.

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

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/14 ,  H02M3/156 ,  H02M3/22 ,  H02M3/325 ,  H02M3/33523 ,  H02M3/33569 ,  H02M3/33576 ,  H02M3/33592 ,  H02M3/337 ,  H02M3/3376 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A converter comprises an input stage coupled to a power source, wherein the input stage comprises a plurality of power switches, a resonant tank coupled to the plurality of power switches, a transformer coupled to the resonant tank, an output stage coupled to the transformer, an efficiency point tracking indicator coupled to the converter, a detector coupled to the efficiency point tracking indicator and a control circuit configured to receive an efficiency point tracking signal from the detector and adjust a switching frequency of the power switches based upon the efficiency point tracking signal.

Abstract translation: A转换器包括耦合到电源的输入级，其中所述输入级包括多个功率开关，耦合到所述多个功率开关的谐振槽，耦合到所述谐振回路的变压器，耦合到所述变压器的输出级， 耦合到转换器的效率点跟踪指示器，耦合到效率点跟踪指示器的检测器和配置成从检测器接收效率点跟踪信号的控制电路，并且基于效率点跟踪信号调整功率开关的开关频率 。