Mingkai K Mu

20130049744, Feb 28, 2013

Aug 31, 2011

13/222235

Mingkai Mu - Blacksburg VA, US
Fred C. Lee - Blacksburg VA, US

G01R 33/14

324222

Core loss in an inductor is measured with reduced sensitivity to phase measurement error by connecting a reactive component to resonate with the inductor and thus cancel a portion of the reactive voltage on the inductor; reducing the phase difference between the inductor voltage and current and making the observed power more resistive. The reactive component may be a capacitor for sinusoidal excitation or an inductance such as an air core transformer for arbitrary excitation.

20200304026, Sep 24, 2020

Mar 20, 2019

16/359371

- Grand Cayman, KY
Mingkai Mu - Fremont CA, US

H02M 3/158
B60L 53/16
B60L 53/10
H02J 7/02
H02M 1/42
H02M 7/12

Embodiments discussed herein refer to backwards compatible charging circuits and methods for charging a battery to a relatively high voltage level regardless of whether the charging station is capable of supplying power at that relatively high voltage level. The circuitry and methods according to embodiments discussed herein can use the onboard charging system to provide a voltage boosting path to increase the charge voltage from a legacy voltage level (e.g., a relatively low voltage level) to a native voltage level (e.g., a relatively high voltage level). When a native voltage charging station is charging the battery, the circuitry and methods according to embodiments discussed herein can use a native voltage path for supplying power, received from the charging station at the native voltage, to the battery.

20170294833, Oct 12, 2017

Apr 11, 2017

15/484641

- Blacksburg VA, US
Mingkai Mu - Newark CA, US
Fred C. Lee - Blacksburg VA, US
Qiang Li - Blacksburg VA, US

H02M 1/42
H01F 27/28
H02M 1/084

A power factor correction (PFC) power converter, particularly of a multiphase totem-pole or other topology presenting a switching bridge that can potentially provide bi-directional power transfer control, reduces a nominal switching frequency and achieves zero voltage switching over an increased portion of a half line cycle by providing positive or inverse coupling of inductors in an inductor structure that can be formed of a multi-layer printed circuit board such that at least three different inductances are presented during each half line cycle period; allowing increased switching frequency and simplifying EMI filtering arrangements. Parasitic capacitances can be balanced with additional coupled windings to reduce differential mode and common mode noise. The PFC power converter is particularly applicable to provide bi-directional power control from an on-board battery charger in an electrically powered vehicle.