Jun Zhang

US Patent:

6490183, Dec 3, 2002

Filed:

Aug 28, 2001

Appl. No.:

09/940971

Inventors:

Jun Zhang - Garland TX

Assignee:

Ericsson, Inc. - Plano TX

International Classification:

H02M 704

US Classification:

363 89, 363127

Abstract:

The present invention provides to a method and apparatus for minimizing or preventing negative current build up in DC-DC converters with synchronous rectification. The method turns the first synchronous rectifier off when the negative current is present in the first secondary winding and the first synchronous rectifier is on, and turns the second synchronous rectifier off when the negative current is present in the second secondary winding and the second synchronous rectifier is on.

US Patent:

20090009137, Jan 8, 2009

Filed:

Jul 5, 2007

Appl. No.:

11/773515

Inventors:

Jun Zhang - Richardson TX, US

International Classification:

H02J 7/00
G05F 1/10

US Classification:

320137, 323283

Abstract:

Apparatus and method to integrate a digital pulse width modulation controller, a digital battery charger controller, and other power management functions in a digital system integrated circuit to increase the design flexibility, manufacture simplicity, improve efficiency, and reduce the complexity and cost of the system design is disclosed. The digital controller and power management circuit can be designed and stored in program code to be implemented when the system is designed. The power management devices and the system can share resources including ADCs, memory, computing function and communication function.

US Patent:

63074583, Oct 23, 2001

Filed:

Sep 22, 1999

Appl. No.:

9/401573

Inventors:

Jun Zhang - Garland TX
Richard Farrington - Heath TX
William Hart - Plano TX

Assignee:

Ericsson Inc. - Richardson TX

International Classification:

H01F 500

US Classification:

336200

Abstract:

An inductor configuration (50) comprising a three-legged inductor core (20) with a first leg (22), second leg (24), and third leg (26) integrally extending from a base (28). The first leg (22) and second leg (24) are predisposed and spaced about a first surface (30) of the base (28) to form a first channel area (32). The second leg (24) also forms, along with the third leg (26), a second channel area (34) separated from the first channel area (32) by the second leg (24). The inductor also comprises an inductor winding (36) arranged about the inductor core (20) to provide relatively equal magnetic flux through the first leg (22), second leg (24), and third leg (26) when current flows through the inductor winding (36). The inductor configuration may be used as an input or output inductor for a synchronous rectifier circuit (100).

US Patent:

60381485, Mar 14, 2000

Filed:

Dec 11, 1998

Appl. No.:

9/209733

Inventors:

Richard W. Farrington - Heath TX
Jun Zhang - Garland TX
William Hart - Plano TX

Assignee:

Ericsson, Inc. - Richardson TX

International Classification:

H02M 3335
H02M 700

US Classification:

363 21

Abstract:

A self-driven synchronous rectifier circuit (42) for a power converter. The circuit comprises a transformer (49, 70) having a secondary winding with a first and second terminal, a first synchronous rectifier (14) coupled to the second transformer terminal and having a control terminal, and a second synchronous rectifier (16) coupled to the first transformer terminal and having a control terminal. The circuit (42) also comprises a first switch (44) coupled to the first synchronous rectifier (14) control terminal, and a second switch (46) coupled to the second synchronous rectifier (16) control terminal. The first (44) and second switch (46) are also coupled to the secondary winding. Switching transitions of the first (14) and second (16) synchronous rectifiers are initiated by a polarity reversal of the voltage of the secondary transformer winding.

US Patent:

61117692, Aug 29, 2000

Filed:

Sep 24, 1999

Appl. No.:

9/405372

Inventors:

Jun Zhang - Garland TX
William Hart - Plano TX

Assignee:

Ericsson, Inc. - Richardson TX

International Classification:

H02M 768
H02M 700
H02M 7217

US Classification:

363127

Abstract:

An external driving circuit (21) for a bridge type synchronous rectifier circuit (20) having a first and second first synchronous rectifier (Q3,Q4), a primary driving circuit (14), and a pair of totem pole drivers (16,18). The timing signal for the first and second synchronous rectifiers (Q3,Q4) is derived from the external driving circuit (21). The external driving circuit (21) includes a first and second switch drivers (22,24). The external driving circuit (21) is interfaced with the synchronous rectifier circuit (20) by connecting first and second switch drivers (22,24) to the totem pole drivers (16,18). The first and second switch drivers (22,24) provides storage for circuit current which is fully discharged at the appropriate time to facilitate turning on and off the synchronous rectifiers (Q3,Q4).

US Patent:

20210341886, Nov 4, 2021

Filed:

May 13, 2021

Appl. No.:

17/319442

Inventors:

- Shenzhen, CN
Yingxuan Zhu - Plano TX, US
Jun Zhang - Plano TX, US
Jian Li - Plano TX, US
Yongxiang Tao - Shanghai, CN
Dayao Liang - Shanghai, CN

International Classification:

G05B 13/02
G06F 16/2457
B60W 50/06

Abstract:

A computer implemented method for self-learning of a control system. The method includes creating an initial knowledge base. The method learns first principles using the knowledge base. The method creates initial control commands derived from the knowledge base. The method generates constraints for the control commands. The method performs constrained reinforcement learning by executing the control commands with the constraints and observing feedback to improve the control commands. The method enriches the knowledge base based on the feedback.