Xiaoping Chen

US Patent:

7515444, Apr 7, 2009

Filed:

Oct 31, 2006

Appl. No.:

11/590158

Inventors:

Xiaoping Chen - Buffalo Grove IL, US

Assignee:

Schumacher Electric Corporation - Mount Prospect IL

International Classification:

H02M 1/08

US Classification:

363 97, 363 26

Abstract:

A switched mode converter is disclosed that includes both voltage mode and current mode control. The switched mode converter also includes mode logic for switching between a voltage mode and a current mode. The converter includes current sensing circuitry for sensing the switcher current on the primary side of the transformer and the load current on the secondary side as well as voltage sensing circuitry for sensing the converter output voltage. When the load current is less than a predetermined value, the converter operates in a voltage mode. During the voltage mode, the output voltage of the voltage mode controller is used to control the duty cycle of a pulse width modulation (PWM) controller. When the load current is greater than a predetermined value, the converter operates in a current mode. In a current mode, the primary switcher current is used to control the PWM controller.

US Patent:

7782636, Aug 24, 2010

Filed:

Feb 12, 2009

Appl. No.:

12/370142

Inventors:

Xiaoping Chen - Buffalo Grove IL, US

Assignee:

Schumacher Electric Corporation - Mt. Prospect IL

International Classification:

H02M 3/335

US Classification:

363 26, 363 97

Abstract:

A switched mode converter is disclosed that includes mode logic for switching between a voltage mode and a current mode. The converter includes circuitry for sensing current on the primary side of the transformer, load current on the secondary side, and output voltage. When the load current is less than a predetermined value, the output voltage of the voltage mode controller is used to control the duty cycle of a PWM controller. When the load current is greater than a predetermined value, the primary current is used to control the PWM controller. During a light load the converter is voltage controlled and there is no minimum load needed to stabilize the control loop. In a current-mode, the control loop will have a relatively faster transient response and avoid flux imbalance in push-pull topology. The converter provides the advantages of both known voltage controlled and current controlled switched mode converters.

US Patent:

7898832, Mar 1, 2011

Filed:

Mar 17, 2010

Appl. No.:

12/725668

Inventors:

Xiaoping Chen - Buffalo Grove IL, US

Assignee:

Schumacher Electric Corporation - Mt. Prospect IL

International Classification:

H02M 1/08

US Classification:

363 97, 363 26

Abstract:

A switched mode converter is disclosed that includes mode logic for switching between voltage mode and current mode. The converter includes sensing circuitry for sensing current on the primary side, load current on the secondary side, and converter output voltage. When load current is less than a predetermined value, the converter operates in voltage mode wherein output voltage of the voltage mode controller is used to control the duty cycle of a PWM controller. When load current is greater than a predetermined value, the converter operates in current mode wherein primary current is used to control the PWM controller. Thus during a light load when the converter is voltage controlled there is no need for a minimum load to stabilize the control loop. In current-mode the control loop will have faster transient response and avoid flux imbalance. Thereby providing advantages of both voltage and current controlled switched mode converters.

US Patent:

20170114124, Apr 27, 2017

Filed:

Oct 21, 2016

Appl. No.:

15/331357

Inventors:

- Evanston IL, US
Xiaoping Chen - Chicago IL, US

International Classification:

C07K 16/18
A61K 47/48
C12N 15/113
C12Q 1/68
G01N 33/574

Abstract:

Myosin 9 family members and Slit-Robo-Myo9-RhoA pathway genes in the treatment and/or diagnosis of cancer.