公开(公告)号：US20210313906A1

公开(公告)日：2021-10-07

申请号：US17352514

申请日：2021-06-21

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： Zhuxian Xu ,  Chingchi Chen

IPC: H02M7/5387 ,  H02M1/08 ,  H02P27/08

Abstract: Current imbalances between parallel switching devices in a power converter half leg are reduced. A gate driver generates a nominal PWM gate drive signal for a respective half leg. A first feedback loop couples the nominal PWM gate drive signal to a gate terminal of a respective first switching device. The first feedback loop has a first mutual inductance with a current path of a first parallel switching device and has a second mutual inductance with a current path of a second parallel switching device. The first and second mutual inductances are arranged to generate opposing voltages in the first feedback loop, so that when all the parallel switching devices carry equal current then the voltages cancel.

公开(公告)号：US20200153362A1

公开(公告)日：2020-05-14

申请号：US16186973

申请日：2018-11-12

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： Zhuxian Xu ,  Chingchi Chen

IPC: H02M7/5387 ,  H03K17/16 ,  H02M1/084

Abstract: A multiphase inverter for an electric vehicle drive has a plurality of drivers to provide drive signals to respective gate loops of upper and lower transistors in the phase legs. A transformer has a secondary winding in a first gate loop of a first transistor in one phase leg and a primary winding connecting a Kelvin-emitter of the first transistor to a Kelvin-emitter of a second transistor in the other phase leg. Switching transients of transistors are shortened because when gate signal is toggled to change a conduction state of a transistor in a first phase leg, a rate of current change in the first leg is sensed in a transformer primary winding connected across a stray inductance of the first leg. A voltage proportional to the sensed rate is added to the gate signal via a transformer secondary winding, thereby increasing a common source inductance of the transistor.

公开(公告)号：US10527653B2

公开(公告)日：2020-01-07

申请号：US15474489

申请日：2017-03-30

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： Richard William Kautz ,  Xi Lu ,  Zhuxian Xu ,  Guangyin Lei ,  Chingchi Chen ,  Lan Yu ,  Michael W. Degner

IPC: G01R15/14 ,  G01R19/00

Abstract: A method includes measuring an impedance of a shunt as a function of frequency and converting the impedance to an admittance in a time domain. The method further includes connecting the shunt in a circuit and measuring voltage data across the shunt over a predetermined interval. The method includes outputting a signal indicative of a current through the shunt derived from the voltage data convolved with the admittance. The method may be implemented in a controller configured to interface with the shunt.

公开(公告)号：US10352968B2

公开(公告)日：2019-07-16

申请号：US15471214

申请日：2017-03-28

Applicant: Ford Global Technologies, LLC

Inventor： Chingchi Chen ,  Xi Lu ,  Guangyin Lei ,  Zhuxian Xu

IPC: G01R15/14

Abstract: A shunt includes a power terminal having a planar first potential region (FPR) connected to a second potential region (SPR) through a resistive element, the SPR being offset from and parallel to the FPR. The shunt includes a sensor terminal having a first potential lead (FPL) connected to the FPR, and a second potential lead (SPL) connected to the SPR and separated from the FPL by an insulation sheet. The SPL and sheet cover the resistive element.

公开(公告)号：US10122357B2

公开(公告)日：2018-11-06

申请号：US15350278

申请日：2016-11-14

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： Xi Lu ,  Chingchi Chen ,  Michael W. Degner ,  Zhuxian Xu ,  Ke Zou

IPC: H03K17/14 ,  H03K17/567 ,  H01L25/07 ,  H01L23/00 ,  H02P27/08 ,  B60L11/18

Abstract: An inverter for an electric vehicle drive has a bridge including a plurality of power switching devices having respective insulated gate terminals and emitter terminals. A PWM circuit determines switching commands for controlling the bridge. A plurality of gate drivers receive the switching commands and provide gate drive signals to respective gate terminals. A plurality of gate capacitors are each thermally coupled to a respective switching device and are electrically connected between the respective gate and emitter terminals. Each gate capacitor has a negative temperature coefficient adapted to counter changes in a switching speed of the switching devices over a predetermined range of temperature. As a result, a consistent switching speed is maintained so that power loss and switching device reliability are optimal across the full temperature range.

公开(公告)号：US10071652B2

公开(公告)日：2018-09-11

申请号：US15151944

申请日：2016-05-11

Applicant: Ford Global Technologies, LLC

Inventor： Xi Lu ,  Chingchi Chen ,  Zhuxian Xu ,  Ke Zou

IPC: H02P1/00 ,  H03K17/16 ,  B60L15/20 ,  B60L11/18 ,  H03K17/567 ,  H02M7/00 ,  H02P27/08

CPC classification number: B60L15/20 ,  B60L3/003 ,  B60L15/007 ,  B60L15/08 ,  B60L50/51 ,  B60L2210/40 ,  B60L2240/526 ,  B60L2240/527 ,  B60L2240/529 ,  B60L2240/80 ,  H02M7/00 ,  H02P27/08 ,  H03K17/165 ,  H03K17/168 ,  H03K17/567 ,  Y02T10/644 ,  Y02T10/645 ,  Y02T10/7005 ,  Y02T10/7241 ,  Y02T10/7258 ,  Y02T10/92

Abstract: A vehicle powertrain includes an electric machine, an inverter including an IGBT having a gate configured to flow current through a phase of the electric machine, and a gate driver. The gate driver is configured to supply power onto the gate via a voltage regulated source, and in response to a collector current of the IGBT exceeding a previous steady state current through the phase, transition to a current regulated source to drive the gate. The gate driver may be configured to delay the transition by a predetermined time that is based on a difference between the previous steady state current and a reverse recovery peak current.

公开(公告)号：US10071634B2

公开(公告)日：2018-09-11

申请号：US15077492

申请日：2016-03-22

Applicant: Ford Global Technologies, LLC

Inventor： Zhuxian Xu ,  Chingchi Chen ,  Xi Lu ,  Ke Zou

IPC: B60L11/02 ,  H02M7/533 ,  B60L11/18 ,  H01L27/06 ,  H01L29/739 ,  H02M3/158 ,  H02M7/5387 ,  H02M1/00

CPC classification number: B60L11/02 ,  B60L50/10 ,  B60L53/24 ,  H01L27/0664 ,  H01L29/7396 ,  H02M3/158 ,  H02M7/533 ,  H02M7/53875 ,  H02M2001/0054 ,  H02M2001/007 ,  Y02B70/1491 ,  Y02T10/7258

Abstract: A vehicle powertrain includes an IGBT that conducts current between a supply and load. The vehicle powertrain also includes a controller that applies voltage to a gate of the IGBT at a first level for a first duration that depends on a capacitance of the gate, and increases the voltage over a second duration based on a rate of change of the current falling below a threshold defined by a supply voltage for the load.

公开(公告)号：US10067165B2

公开(公告)日：2018-09-04

申请号：US14846521

申请日：2015-09-04

Applicant: Ford Global Technologies, LLC

Inventor： Chingchi Chen ,  Richard William Kautz ,  Zhuxian Xu

IPC: G01R15/18 ,  G01R17/02 ,  G01R29/26 ,  G01R19/00 ,  G01R31/00

Abstract: A differential voltage probe for providing accurate measurement of differential voltage with high frequency components is disclosed that is further configured to accurately identify noise sources in EMI/EMC applications. The differential voltage probe is configured to provide the benefits of adequate differential voltage measurement bandwidth, galvanic isolation capability, high CMRR, flexible design to accommodate various requirements on voltage rating, loading effect, and frequency range of interest; and/or easy implementation and low cost. The differential voltage probe is able to achieve these optimized capabilities by implementing unique winding designs for transformer(s) used in the differential voltage probe circuit design.

公开(公告)号：US09838002B2

公开(公告)日：2017-12-05

申请号：US15132490

申请日：2016-04-19

Applicant: Ford Global Technologies, LLC

Inventor： Zhuxian Xu ,  Chingchi Chen ,  Xi Lu ,  Ke Zou

IPC: H03K17/284 ,  H02M3/158 ,  H03K17/10 ,  B60L11/18

CPC classification number: H03K17/107 ,  B60L11/1816 ,  H02M1/08 ,  H02M3/158 ,  H02M2001/0045 ,  H02P27/06 ,  H03K17/042 ,  H03K17/166 ,  H03K17/168 ,  H03K17/284 ,  Y02T10/7258

Abstract: A vehicle powertrain includes an IGBT and a gate driver. The IGBT is configured to energize an electric machine. The gate driver is configured to apply an off voltage less than a threshold voltage onto a gate of the IGBT while the IGBT is operating in a saturation mode, and in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage to reduce flyback from the electric machine. The gate driver may be configured to, in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage and below the threshold to reduce flyback from the electric machine.

公开(公告)号：US20240162519A1

公开(公告)日：2024-05-16

申请号：US17987615

申请日：2022-11-15

Applicant: Ford Global Technologies, LLC

Inventor： Man Prakash Gupta ,  Alfredo R. Munoz ,  Michael W. Degner ,  Zhuxian Xu

IPC: H01M10/613 ,  H01M10/625 ,  H01M10/6556 ,  H01M10/6566

CPC classification number: H01M10/613 ,  H01M10/625 ,  H01M10/6556 ,  H01M10/6566 ,  H01M2220/20

Abstract: A power module, such as a power module of a traction powertrain of an electrified vehicle, includes a power module cell arranged in a stack that defines a coolant supply manifold and a coolant return manifold. The power module cell includes a power stage having a substrate. The substrate includes first microchannels configured to input coolant from the supply manifold and impeded from outputting coolant to the return manifold, second microchannels configured to output coolant to the return manifold and impeded from inputting coolant from the supply manifold, and third microchannels crisscrossing and connecting the first and second microchannels in fluid communication.