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公开(公告)号：US11489437B2
公开(公告)日：2022-11-01
申请号：US17352514
申请日：2021-06-21
Applicant: FORD GLOBAL TECHNOLOGIES, LLC
Inventor： Zhuxian Xu , Chingchi Chen
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.
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公开(公告)号：US10705118B2
公开(公告)日：2020-07-07
申请号：US15467920
申请日：2017-03-23
Applicant: Ford Global Technologies, LLC
Inventor： Xi Lu , Krishna Prasad Bhat , Chingchi Chen , Zhuxian Xu , Guangyin Lei
Abstract: A testing apparatus includes a holster including a jack defining a conductive periphery configured to connect with a reference lead of the voltage probe to form a common ground. The apparatus includes a shunt defining first and second regions of different potential having predetermined difference. The second region is configured to connect with a reference lead of the shunt probe. The apparatus includes a bridge configured to connect the shunt probe lead with the common ground.
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公开(公告)号：US10439485B2
公开(公告)日：2019-10-08
申请号：US15873198
申请日：2018-01-17
Applicant: FORD GLOBAL TECHNOLOGIES, LLC
Inventor： Zhuxian Xu , Chingchi Chen
IPC: H02M1/088 , B60L50/51 , H03K17/00 , H02M7/5387 , H02M1/00
Abstract: An electrified vehicle propulsion system uses current feedback to modify gate drive signals to suppress voltage spikes and increase switching efficiency. A DC link having a link capacitor and a link inductance is connected to first and second converters. A first converter bridge has a first phase leg with first upper and lower switching devices, each switching device having a respective gate loop. A second converter bridge has a second phase leg with second upper and lower switching devices, each switching device having a respective gate loop. A plurality of gate drivers provide gate drive signals to respective gate loops for turning the respective switching devices on and off. A plurality of gate coils are provided, wherein each gate coil is connected in series between a respective gate driver and a respective gate loop. Each gate coil is respectively inductively coupled to the link inductance.
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Patent Agency Ranking
公开(公告)号：US10388460B2
公开(公告)日：2019-08-20
申请号：US15161668
申请日：2016-05-23
Applicant: FORD GLOBAL TECHNOLOGIES, LLC
Inventor： Guangyin Lei , Xi Lu , Zhuxian Xu , Chingchi Chen
Abstract: A capacitor comprising first and second end sprays respectively located at distal ends of a capacitor cell, a positive polarity bus bar extending from a first wound conductive layer of the capacitor cell adjacent to the first end spray, a negative polarity bus bar extending from a second wound conductive layer of the capacitor cell adjacent to the second end spray, and a capacitor film wrapped around an area between the first and second conductive layers.
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公开(公告)号：US10340811B2
公开(公告)日：2019-07-02
申请号：US15361898
申请日：2016-11-28
Applicant: FORD GLOBAL TECHNOLOGIES, LLC
Inventor： Zhuxian Xu , Chingchi Chen , Michael W. Degner
Abstract: A selectable increase in the common source inductance is obtained by a layout for a power module used for a half-bridge phase leg in an inverter for an electrically-driven vehicle. The power module comprises a pair of transistor dies connected to positive, negative, and AC conductive tracks for carrying bridge currents. The module includes a pair of gate drive pins and a pair of gate drive coils connecting a respective pin and die. The gate drive coils are disposed in a region between the positive and negative tracks containing a flux generated by the currents having a locally greatest rate of change. The coils may preferably be comprised of traces on an auxiliary printed circuit board incorporated in the module. The gate drive pins can be on the gate side or the emitter side of the transistor dies.
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公开(公告)号：US10250115B2
公开(公告)日：2019-04-02
申请号：US15341184
申请日：2016-11-02
Applicant: FORD GLOBAL TECHNOLOGIES, LLC
Inventor： Zhuxian Xu , Chingchi Chen
IPC: H02M1/08 , H02M7/00 , H03K17/08 , H03K17/0814 , H03K17/16 , H02M7/5387 , H02M1/084 , H02M7/537 , H02M1/088 , H02M7/538
Abstract: A phase leg in an inverter bridge has an upper transistor with upper gate, collector, and emitter terminals, wherein the upper gate and emitter terminals are arranged to create an upper common source inductance. A lower transistor has lower gate, collector, and emitter terminals, wherein the lower gate and emitter terminals are arranged to create a lower common source inductance. An upper diode is coupled across the upper collector and emitter terminals and substantially in parallel with the upper common source inductance. A lower diode is coupled across the lower collector and emitter terminals and substantially in parallel with the lower common source inductance. Thus, the diodes substantially bypass the common source inductances when carrying commutation current when one of the transistors is switching off. This allows the phase leg to possess significant common source inductance at the gate terminals while avoiding “shoot-through” issues.
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公开(公告)号：US20170327001A1
公开(公告)日：2017-11-16
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: B60L15/20 , H03K17/16 , H02P27/08 , H03K17/567 , B60L11/18
CPC classification number: B60L15/20 , B60L3/003 , B60L11/1803 , B60L15/007 , B60L15/08 , B60L2210/40 , B60L2240/526 , B60L2240/527 , B60L2240/529 , B60L2240/80 , H02M7/00 , H02P27/08 , H03K17/165 , H03K17/168 , H03K17/567 , Y02T10/7258
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.
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公开(公告)号：US09813009B1
公开(公告)日：2017-11-07
申请号：US15426288
申请日：2017-02-07
Applicant: Ford Global Technologies, LLC
Inventor： Zhuxian Xu , Chingchi Chen
IPC: H02P27/04 , H02P27/08 , B60L11/18 , H02M7/5395 , H03K17/567 , H03K17/687
CPC classification number: B60L11/1803 , B60L3/003 , B60L15/08 , B60L2210/40 , H02M7/538 , H03K17/06 , H03K17/165 , H03K17/168 , H03K2017/066
Abstract: An inverter for an electric vehicle comprises a phase leg having series-connected upper and lower transistors between a positive bus and a ground bus. Upper and lower gate drive circuits supply gate drive signals to the upper and lower transistors. Each gate drive circuit includes an active clamp for deactivating the upper and lower transistors. The transistors are comprised of semiconductor devices, each having respective gate, collector, and emitter terminals. Each pair of gate and emitter terminals is adapted to provide an enhanced common source inductance therebetween. Each gate terminal is adapted to be tied to a ground voltage of the drive circuits. Each respective active clamp is comprised of a p-channel MOSFET having a source terminal connected to the gate terminal of a respective transistor and having a drain terminal connected to the emitter terminal of the respective transistor bypassing the respective enhanced common source inductance.
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