Yimin ChenSan Jose, CA

2014002, Jan 23, 2014

Jul 10, 2013

13/939120

Clarita C. Poon - Pleasanton CA, US
Yimin Chen - Palatine IL, US
Mark Eason - Hollister CA, US
Chuanyang Wang - San Jose CA, US

H05B 33/08

315307

An integrated LED controller drives and reads a passive dimmer and controls a power circuit for the LED. The integrated LED controller detects changes in the position of the passive dimmer and causes the power circuit to brighten or dim the LED accordingly. These functions are normally performed by multiple discrete components. However, the integrated LED controller is implemented as a single integrated circuit, thus reducing the size and cost of the LED dimming system. The integrated LED controller can also include a unified timing controller that coordinates the timing of multiple functions within the controller in a manner that reduces the noise sensitivity of the controller.

2021037, Dec 2, 2021

May 29, 2020

16/888466

- Campbell CA, US
Yimin CHEN - Campbell CA, US
Mengfei LIU - Campbell CA, US
Pengju KONG - Campbell CA, US

H02M 1/08
H02M 3/335
H03K 5/24

A flyback converter is provided that dynamically adjusts a drain threshold voltage for a current cycle of a synchronous rectifier switch transistor based upon operating conditions in a previous cycle of the synchronous rectifier switch transistor. A differential amplifier drives a gate voltage of the synchronous rectifier switch transistor during an on-time of the current cycle so that a drain voltage of the synchronous rectifier switch transistor equals the drain threshold voltage during a regulated portion of the current cycle.

2021037, Dec 2, 2021

May 29, 2020

16/888437

- Campbell CA, US
Yimin CHEN - Campbell CA, US
David NGUYEN - Campbell CA, US
Juyoung YOON - Campbell CA, US
Tao LI - Campbell CA, US
Guang FENG - Campbell CA, US
Kai-Wen CHIN - Campbell CA, US
Yong Xiong LIN - Campbell CA, US
Jianming YAO - Campbell CA, US

H02M 3/335
H03F 3/45
G01R 19/165
H03K 5/24
H03M 1/00
H04B 10/80
H03K 17/78

A flyback converter is provided that detects a load-transient-produced increase in the output current to more quickly detect and respond to the load transient.

2021037, Dec 2, 2021

Jan 15, 2021

17/151028

- Campbell CA, US
Yimin CHEN - Campbell CA, US
Mengfei LIU - Campbell CA, US
Pengju KONG - Campbell CA, US

H02M 3/335
H02M 1/08

A flyback converter is provided that dynamically adjusts a drain threshold voltage for a current cycle of a synchronous rectifier switch transistor based upon operating conditions in a previous cycle of the synchronous rectifier switch transistor. A differential amplifier drives a gate voltage of the synchronous rectifier switch transistor during an on-time of the current cycle so that a drain voltage of the synchronous rectifier switch transistor equals the drain threshold voltage during a regulated portion of the current cycle.

2019028, Sep 12, 2019

May 23, 2019

16/421091

- Campbell CA, US
Scott Brown - Campbell CA, US
Mengfei Liu - Campbell CA, US
Yimin Chen - Campbell CA, US

H02M 1/32
H02M 3/335
H02J 7/00
H02M 1/08

A switching power converter is disclosed that communicates a thermal alarm to a mobile device over a data channel in a data cable for charging the mobile device.

2019014, May 16, 2019

Nov 10, 2017

15/809682

- Campbell GA, US
- London, GB
Yimin Chen - Campbell CA, US
Huaming Guo - Shenzhen, CN
Zhaowu Luo - Shenzhen, CN

H02M 3/335
H02J 7/00

A switch detection circuit is provided that senses the voltage on a rectifying component for rectifying a secondary winding current through a secondary winding of a flyback converter's transformer to determine whether a power switch transistor attached to a primary winding of the transformer has ceased cycling.

2018036, Dec 20, 2018

Jul 24, 2018

16/044470

- Campbell CA, US
- London, GB
Jiandong Zhang - Campbell CA, US
Lijie Chen - Tianjin, CN
Honglai Wang - Tianjin, CN
Yimin Chen - Campbell CA, US

H02M 3/335
H02M 1/08
H02H 7/12
H02M 1/00

A power system and related methods provide sense resistor fault detection and safe operation of switching power converters and connected devices such as portable electronic devices powered by the switching power converter. The power system detects an open circuit or short circuit condition of the sense resistor and controls output current of the switching power converter to ensure safe operating conditions of the power system and connected equipment. The power system can also detect initial inrush current of the connected equipment and detect a duty cycle of the switching power converter to positively detect a short circuit condition of the sense resistor.

2018010, Apr 12, 2018

Dec 4, 2017

15/831213

- Campbell CA, US
- London, GB
Yimin Chen - Campbell CA, US
Xiaolin Gao - Campbell CA, US

H02M 3/335
H02M 1/08
H02M 1/00

A switching power converter is provided that extrapolates from a reference voltage during dead periods of a rectified input voltage as determined from a comparison of an Isense voltage to a current threshold.