Feng Chiao Lin

US Patent:

6574124, Jun 3, 2003

Filed:

Sep 11, 2002

Appl. No.:

10/242558

Inventors:

Feng Lin - Plano TX
Ning Sun - Plano TX
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX

Assignee:

Netpower Technologies, Inc. - Plano TX

International Classification:

H02M 3335

US Classification:

363 65, 363 72, 363 97

Abstract:

A power distribution system is provided including current sharing circuitry, current sensing and over-current protection. The system includes a plurality of power converter modules each having a current sharing signal terminal on an input side and power output terminals on an output side, the corresponding power output terminals of the several modules being connected together and adapted to power a common load; an interconnecting signal bus coupled across the current sharing signal terminals on the input side; a plurality of feedback circuits, each of which is associated with one of said modules, each feedback circuit including a comparator (error amplifier) for comparing a feedback voltage on the output side with a reference voltage to provide an error signal to the input side; the error signal conditioned to provide a current command signal to said signal bus, wherein the signal bus provides a common current command signal to drive the power converter modules.

US Patent:

6760235, Jul 6, 2004

Filed:

Sep 11, 2002

Appl. No.:

10/241336

Inventors:

Feng Lin - Plano TX
Ning Sun - Plano TX
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX

Assignee:

Netpower Technologies, Inc. - Plano TX

International Classification:

H02M 3335

US Classification:

363 2106, 363 49

Abstract:

Circuit and method for controlling circuitry in a power converter device during a soft-start process is provided. Synchronous rectifier control circuitry is adapted to gradually apply a gate drive signal derived from the main switch of the power converter device to a freewheeling synchronous rectifier of the switching circuitry during the soft-start process. The control circuitry gradually releases the amplitude or the pulse-width of the gate drive signal to the freewheeling synchronous rectifier to avoid a large duty ratio in the synchronous rectifier during start-up so that a negative current does not build up in the output inductor.

US Patent:

61815772, Jan 30, 2001

Filed:

Jul 26, 1999

Appl. No.:

9/360563

Inventors:

Feng Lin - Plano TX

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H02M 3335

US Classification:

363 21

Abstract:

For use in a power supply having a bias circuit with a bias transformer, an auxiliary bias circuit and a method of providing power via the auxiliary bias circuit to an auxiliary load. In one embodiment, the auxiliary bias circuit includes a blocking device coupled to the bias transformer. The auxiliary bias circuit also includes a storage device, coupled to the blocking device and across the bias transformer, that provides a voltage to drive the auxiliary load without requiring a separate power supply.

US Patent:

60551690, Apr 25, 2000

Filed:

Apr 24, 1998

Appl. No.:

9/066130

Inventors:

Wayne C. Bowman - Allen TX
Feng Lin - Plano TX
Rui Liu - Plano TX

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H02M 748

US Classification:

363 65

Abstract:

For use with a power supply including first and second parallel-coupled converters having interleaved first and second switches, respectively, the first and second switches limited to a duty cycle of less than about 50 percent, a current mode control circuit and a method of current-mode controlling the power supply. In one embodiment, the current mode control circuit, includes: (1) an interconverter current transformer, coupled to an input of the power supply, that senses an input current of the power supply and (2) a controller, coupled to the current transformer, that moderates the duty cycle of the first and second switches as a function of the input current to cause the first and second converters to share an output current of the power supply.

US Patent:

60612606, May 9, 2000

Filed:

Aug 19, 1998

Appl. No.:

9/136171

Inventors:

Feng Lin - Plano TX

Assignee:

Lucent Technology Inc. - Murray Hill NJ

International Classification:

H05K 720

US Classification:

363141

Abstract:

A power supply and a method of manufacturing the same. In one embodiment, the power supply includes: (1) a substrate, (2) a main power supply mounted on the substrate and having an input and a main output, (3) an auxiliary power supply mounted on the substrate, coupled to the input and having an auxiliary output and (4) a cooling device mount, coupled to the power supply, configured to receive and support a cooling device, the auxiliary output configured to provide electric power to the cooling device.

US Patent:

60814365, Jun 27, 2000

Filed:

Aug 12, 1998

Appl. No.:

9/132955

Inventors:

Feng Lin - Plano TX

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

H02M 700

US Classification:

363 65

Abstract:

A multi-output power supply voltage sensing method and apparatus with increased static efficiency over prior art are disclosed. The method and apparatus employ resistance in the negative sensing wire to alleviate electromagnetic interference. The method and apparatus can change the output voltage set point of the power stage, canceling or changing the output voltage setpoint shift is also disclosed.