Daniel Scott Jenkins

US Patent:

7162655, Jan 9, 2007

Filed:

Jul 16, 2003

Appl. No.:

10/620945

Inventors:

Brent A. McDonald - Round Rock TX, US
John A. Herrmann - Cedar Park TX, US
Daniel E. Jenkins - Bastrop TX, US

Assignee:

Dell Products, L.P. - Round Rock TX

International Classification:

G06F 1/26

US Classification:

713320, 713300, 713340

Abstract:

Power supply response to variations in power demand by a microprocessor is improved with a compensation loops that estimate changes in load current with improved speed. The load current estimate is performed in part with a capacitance feed forward compensation loop that senses voltage at output capacitors to replicate the current present in the capacitors and communicates the capacitor current adjusted by an optimized gain to the power supply for adjustment of power output. Capacitor current is replicated with a frequency domain filter having a pole that cancels out the zero created by power supply equivalent series resistance and capacitor capacitance. The capacitance compensation loop improves power supply response time to microprocessor power demand skews so that the size or number of output capacitors may be reduced while still maintaining power supply at the microprocessor to within desired voltage and current tolerances.

US Patent:

7280376, Oct 9, 2007

Filed:

Oct 15, 2004

Appl. No.:

10/966785

Inventors:

Brent A. McDonald - Round Rock TX, US
Daniel E. Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

H02M 3/335
G05F 5/00

US Classification:

363 20, 323299, 363 2112

Abstract:

In a method and system for providing isolated power, a flyback controller includes a transformer operable to receive a primary voltage input and generate a secondary voltage output. A switch electrically coupled in series with a primary side of the transformer receives a control signal for controlling a duty cycle of the primary voltage. A controller is operable to generate the control signal responsive to receiving a plurality of inputs from the primary side. The controller regulates the secondary voltage output without receiving feedback input from a secondary side of the transformer by computing the secondary voltage as a predefined function of the plurality of the inputs when the switch is open.

US Patent:

7538535, May 26, 2009

Filed:

Jan 13, 2006

Appl. No.:

11/331676

Inventors:

Brent A. McDonald - Round Rock TX, US
Daniel E. Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

G05F 1/565
G05F 5/00
H02M 1/14

US Classification:

323288, 323299, 323286, 363 39

Abstract:

Control loop ripple voltage in an error amplifier may be the result of a non-linear time varying behavior of a switch mode power conversion process. An inverse waveform replica of the error amplifier control loop ripple voltage waveform may be generated to substantially cancel the non-linear loop dynamics introduced by the control loop ripple voltage. Once the control loop ripple voltage is substantially cancelled the bandwidth of the DC-to-DC converter control loop may be increased for faster loop response thus reducing the need for additional output filter capacitance.

US Patent:

7602163, Oct 13, 2009

Filed:

Dec 20, 2005

Appl. No.:

11/313343

Inventors:

Brian Patrick Johnson - Cedar Park TX, US
Daniel E. Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

G05F 1/40

US Classification:

323282

Abstract:

An information handling system includes a power converter having a first switched inductor to supply current to a load. A second switched inductor is inductively coupled to the first switched inductor. A control circuit activates the second switched inductor in response to a change in the power requirements of the load, so as to remove energy stored in the first switched inductor and thereby regulate the output voltage of the power converter when load current is stepped downwards.

US Patent:

8055916, Nov 8, 2011

Filed:

Nov 1, 2007

Appl. No.:

11/933779

Inventors:

Brent McDonald - Round Rock TX, US
George Richards, III - Round Rock TX, US
Daniel Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

G06F 1/26

US Classification:

713300, 713340

Abstract:

A voltage regulator provides power to an information handling system component under management by a controller, such as a Buck circuit managed by a PID controller according to PID coefficient settings. An update module interfaced with the voltage regulator monitors operating conditions of the voltage regulator to update the coefficients used by the controller. For example, changes in the load applied to the voltage regulator and an inductance associated with the voltage regulator are used to periodically compute updated PID coefficients, which are then used by the controller to control the voltage regulator.

US Patent:

20060045755, Mar 2, 2006

Filed:

Aug 24, 2004

Appl. No.:

10/925240

Inventors:

Brent McDonald - Round Rock TX, US
Daniel Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

F04B 37/02
F04F 11/00
H02K 44/00

US Classification:

417050000, 417048000

Abstract:

An information handling system (IHS) is provided which is cooled via an electromagnetic pump. The pump pushes a heat conducting liquid metal fluid in a heat conducting path away from a heat producing device such as a processor. The EM pump is driven by an AC electric current supplied to a transformer. The AC driven transformer supplies both a magnetic field and an electric current to the fluid in the pump. The system is configured such that the magnetic field and the electric current in the fluid are substantially orthogonal. Each time the AC electric current reverses polarity, the magnetic field and the electric current also each change polarity to force fluid out of the pump in the same direction during both the positive and negative going portions of the AC electric current cycle.

US Patent:

20070139983, Jun 21, 2007

Filed:

Dec 20, 2005

Appl. No.:

11/314370

Inventors:

Brian Johnson - Cedar Park TX, US
Daniel Jenkins - Bastrop TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

H02M 3/06

US Classification:

363062000

Abstract:

An information handling system includes a buck converter, having a synchronous switch, to supply power to an electrical load. A first inductor is placed in series with the synchronous switch, and a second inductor is inductively coupled to the first inductor. A switched path recovers energy stored in the first inductor, via the second inductor, when the synchronous switch is open.