Liming Ming Liu

US Patent:

20210111632, Apr 15, 2021

Filed:

Oct 27, 2020

Appl. No.:

17/081071

Inventors:

- Plano TX, US
Liming LIU - Cary NC, US
Jing XU - Cary NC, US

International Classification:

H02M 3/335

Abstract:

According to one aspect of the present disclosure, a single-stage converter includes a rectifying circuit and a buck-boost circuit. The buck-boost circuit includes an inductor with a center tap configured to supply an output of the buck-boost circuit to the rectifying circuit. The buck-boost circuit also includes first and second interleaved arms arranged in parallel with a voltage input of the single-stage converter. The first and second interleaved arms are each coupled to the inductor and include a plurality of switches operable to control the output of the buck-boost circuit.

US Patent:

20210050793, Feb 18, 2021

Filed:

Nov 3, 2020

Appl. No.:

17/087795

Inventors:

- Plano TX, US
Liming LIU - Cary NC, US
Jing XU - Cary NC, US

International Classification:

H02M 3/335
H02M 1/42

Abstract:

According to an aspect of this disclosure, a circuit includes a voltage source and an output load, first and second resonant modules disposed between the voltage source and the output load, and first and second transformers. The circuit is further arranged such that the first transformer is disposed between the first resonant module and the output load, and the second transformer is disposed between the second resonant module and the output load. The circuit also includes a plurality of half-bridges coupled between the first and second resonant modules and the voltage source. The circuit further includes a voltage divider disposed between the voltage source and the plurality of half-bridges.

US Patent:

20200287444, Sep 10, 2020

Filed:

Mar 8, 2019

Appl. No.:

16/297039

Inventors:

- Baden, CH
Liming Liu - Cary NC, US
Colin Tschida - Durham NC, US

International Classification:

H02K 9/22
H02K 5/04
H02K 11/33
H01L 23/38

Abstract:

A combined electric motor and motor drive are provided. The electric motor and motor drive are attached together to form a co-packaged unit. In the co-packaged electric motor and motor drive, both the motor drive and the electric motor generate heat. A thermoelectric cooler is provided that may transfer heat away from the motor drive. The thermoelectric cooler may also insulate the motor drive from the heat generated by the motor.

US Patent:

20190393161, Dec 26, 2019

Filed:

Jun 26, 2018

Appl. No.:

16/018933

Inventors:

- Baden, CH
Jing Xu - Cary NC, US
Liming Liu - Cary NC, US
Elio Alberto Perigo - Raleigh NC, US

International Classification:

H01L 23/552
H01L 23/498
H05K 9/00
H01L 21/3205
H01L 23/538
H05K 1/18
H05K 1/02

Abstract:

A multi-layered conductor comprising one or more conductor layers of an electrically conductive material and one or more shielding layers of a soft magnetic material. The shielding layer can be coated onto the conductor layer and has a lower conductivity and a higher magnetic permeability than the electrically conductive material of conductor layers. The shielding layer can, at least when alternating current (AC) flows through the multi-layered conductor at relatively high frequencies, provide a separate power path for at least a portion of the high frequency AC current, as well as absorb at least a portion of the high frequency noises associated with that separated high frequency AC current. Additionally, the shielding layer can be separated from the conductor layer at an output end of the multi-layered conductor so that output ends of the shielding layer and conductor layer can be electrically connected to different electrical devices or components.

US Patent:

20190363540, Nov 28, 2019

Filed:

May 25, 2018

Appl. No.:

15/989667

Inventors:

- Baden, CH
Sandeep Bala - Raleigh NC, US
Liming Liu - Cary NC, US
Yuxiang Shi - Raleigh NC, US

International Classification:

H02J 3/38
H02M 3/155
H02M 1/12

Abstract:

Unique systems, methods, techniques and apparatuses of photovoltaic (PV) string power systems are disclosed. One exemplary embodiment is a PV power system comprising a plurality of PV strings and a floating DC-DC optimizer. The floating DC-DC optimizer comprises a first DC bus rail, a second DC bus rail, a plurality of input legs, each leg being coupled across the first DC bus rail and second DC bus rail, including two input leg semiconductor switches coupled at an input terminal, each input terminal being structured to receive an input current from an end of one PV string of the plurality of PV strings, and an output leg including two output leg semiconductor devices coupled at an output terminal.

US Patent:

20190207550, Jul 4, 2019

Filed:

Dec 30, 2017

Appl. No.:

15/859463

Inventors:

- Baden, CH
Darren Tremelling - Apex NC, US
Elio Alberto Perigo - Raleigh NC, US
Giulio Secondo - Genova, IT
Liming Liu - Cary NC, US

International Classification:

H02P 31/00
H01F 13/00
H02K 1/27
H02K 1/12
H02K 11/20
H02K 15/03

Abstract:

A method for operating an electrical machine having a stator and having a rotor with permanent magnets, includes: running the electrical machine; determining, while performing the running of the electrical machine, whether the permanent magnets have been demagnetized; finding, while running the electrical machine, the q-axis responsive to a determination that the permanent magnets have been demagnetized; firing a current pulse through the stator, while running the electrical machine, when the q-axis reaches a desired position relative to a selected stator phase, wherein the current pulse is constructed to remagnetize the permanent magnets; and continuing to run the electrical machine.

US Patent:

20190033362, Jan 31, 2019

Filed:

Jul 25, 2017

Appl. No.:

15/659096

Inventors:

- Baden, CH
Arun Kadavelugu - Raleigh NC, US
Joonas Puukko - Helsinki, FI
Liming Liu - Cary NC, US
Jukka-Pekka Sjoroos - Espoo, FI

International Classification:

G01R 31/26
H01L 29/16
H01L 29/78
H03K 17/687

Abstract:

Unique systems, methods, techniques and apparatuses of semiconductor failure prognostication. One exemplary embodiment is a power converter comprising a semiconductor switch and a converter control system. The converter control system is configured to turn on the semiconductor switch, measure a first voltage and a current during reverse conduction, estimate junction temperature of the semiconductor device, turn off the semiconductor device, measure a second voltage after turning off the semiconductor device, determine a resistance value using the second voltage measurement, determine an expected resistance value, predict a failure of the semiconductor device using the resistance value and the expected resistance value, and transmit a semiconductor device failure warning.