Michael C Walters

US Patent:

RE38454, Mar 9, 2004

Filed:

Jan 11, 2002

Appl. No.:

10/044479

Inventors:

Michael M. Walters - Apex NC
Charles E. Hawkes - Cary NC
Robert H. Isham - Flemington NJ

Assignee:

Intersil Communications, Inc. - Wilmington DE

International Classification:

G05F 140

US Classification:

323272

Abstract:

A multi-phase DC/DC converter having an output voltage and including a plurality of converter channels. Each converter channel includes a converter channel input and a converter channel output. Each converter channel is configured for generating a converter channel current and for adjusting said converter channel current in response to a control signal electrically connected to each converter channel input. A control circuit generates an error signal representative of a comparison of the converter output voltage to a reference voltage. The control circuit includes a plurality of control circuit channels, each of which correspond to a converter channel. Each control circuit channel generates a channel current signal representative of a corresponding converter channel current, and generates a differential channel current signal representative of a comparison of the channel current signal to an average current signal. The average current signal is representative of an overall average current for the converter channels. Each control circuit channel generates a differential error signal representative of a comparison of the error signal to the differential channel current signal.

US Patent:

6734656, May 11, 2004

Filed:

Dec 10, 2002

Appl. No.:

10/316136

Inventors:

Greg J. Miller - Apex NC
Michael M. Walters - Apex NC

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F 140

US Classification:

323284, 327566

Abstract:

A power switching stage architecture for a buck topology-based, DCâDC converter includes an upper power switching N-channel device FET integrated in the same semiconductor circuit chip with the switching driver, while a lower power switching is also an N-channel FET, but is external to the driver chip. Either of the two power switching FETs may be configured to include a pilot FET cell, to facilitate current sensing for the controller.

US Patent:

6791306, Sep 14, 2004

Filed:

Sep 6, 2002

Appl. No.:

10/236787

Inventors:

Michael M. Walters - Apex NC
Vladimir Muratov - Manchester NH
Stefan Wlodzimierz Wiktor - Raleigh NC

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F 140

US Classification:

323288, 323282, 323285

Abstract:

A synthetic ripple regulator for a DCâDC converter generates an auxiliary voltage waveform that effectively replicates the waveform ripple current through an output inductor, and uses the auxiliary voltage waveform to control toggling of a hysteretic comparator. In a non-limiting implementation, a transconductance amplifier monitors the voltage across the inductor, and supplies an inductor voltage-representative current to a ripple waveform capacitor, so as to produce the auxiliary voltage waveform. Using the replicated inductor current for ripple regulation results in low output ripple, input voltage feed forward, and simplified compensation.

US Patent:

6812677, Nov 2, 2004

Filed:

Aug 15, 2002

Appl. No.:

10/219555

Inventors:

Michael M. Walters - Apex NC
Matthew B. Harris - Durham NC
Bogdan M. Duduman - Raleigh NC

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F 1573

US Classification:

323277, 323275

Abstract:

A DC-to-DC converter includes one or more power switches, a pulse width modulation circuit for generating control pulses for the power switches, and an output inductor connected to the power switches. A thermally compensated current sensor is connected to an intrinsic current sensing element exhibiting a temperature-based parameter non-linearity. The thermally compensated current sensor has a temperature coefficient that substantially matches a temperature coefficient of an intrinsic power converter element used to measure current flow, thus linearizing the current measurement. Also, a current feedback loop circuit cooperates with the pulse width modulation circuit to control the power switches responsive to the thermally compensated current sensor.

US Patent:

6833690, Dec 21, 2004

Filed:

Mar 23, 2004

Appl. No.:

10/806605

Inventors:

Michael M. Walters - Apex NC
Matthew B. Harris - Durham NC
Bogdan M. Duduman - Raleigh NC

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F 1573

US Classification:

323277, 323275

Abstract:

A DC-to-DC converter includes one or more power switches, a pulse width modulation circuit for generating control pulses for the power switches, and an output inductor connected to the power switches. A thermally compensated current sensor is connected to an intrinsic current sensing element exhibiting a temperature-based parameter non-linearity. The thermally compensated current sensor has a temperature coefficient that substantially matches a temperature coefficient of an intrinsic power converter element used to measure current flow, thus linearizing the current measurement. Also, a current feedback loop circuit cooperates with the pulse width modulation circuit to control the power switches responsive to the thermally compensated current sensor.

US Patent:

6870352, Mar 22, 2005

Filed:

Jun 2, 2004

Appl. No.:

10/858586

Inventors:

Michael M. Walters - Apex NC, US
Matthew B. Harris - Durham NC, US
Bogdan M. Duduman - Raleigh NC, US

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F001/573
G05F001/565

US Classification:

323277, 323275

Abstract:

A DC-to-DC converter includes one or more power switches, a pulse width modulation circuit for generating control pulses for the power switches, and an output inductor connected to the power switches. A thermally compensated current sensor is connected to an intrinsic current sensing element exhibiting a temperature-based parameter non-linearity. The thermally compensated current sensor has a temperature coefficient that substantially matches a temperature coefficient of an intrinsic power converter element used to measure current flow, thus linearizing the current measurement. Also, a current feedback loop circuit cooperates with the pulse width modulation circuit to control the power switches responsive to the thermally compensated current sensor.

US Patent:

6922044, Jul 26, 2005

Filed:

Sep 29, 2003

Appl. No.:

10/673684

Inventors:

Michael M. Walters - Apex NC, US
Xuening Li - Cary NC, US
Thomas A. Jochum - Durham NC, US

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F001/40

US Classification:

323288, 323282, 323285

Abstract:

A multiphase ripple voltage regulator generator employs a hysteretic comparator referenced to upper and lower voltage thresholds. The hysteretic comparator monitors a master ripple voltage waveform developed across a capacitor supplied with a current proportional to the difference between the output voltage and either the input voltage or ground. The output of the hysteretic comparator generates a master clock signal that is sequentially coupled to PWM latches, the states of which define the durations of respective components of the synthesized ripple voltage. A respective PWM latch has a first state initiated by a selected master clock signal and terminated by an associated phase voltage comparator that monitors a respective phase node voltage.

US Patent:

RE38780, Aug 23, 2005

Filed:

Feb 26, 2003

Appl. No.:

10/375914

Inventors:

Charles E. Hawkes - Cary NC, US
Michael M. Walters - Apex NC, US
Robert H. Isham - Flemington NJ, US

Assignee:

Intersil Americas Inc. - Milpitas CA

International Classification:

G05F001/56

US Classification:

323282, 323285

Abstract:

A DC/DC converter has an output voltage and sources an output current to a load. The DC/DC converter includes an error amplifier with a reference input and a summing input. The reference input is electrically connected to a reference voltage. The summing input is electrically connected to the output voltage and the output current. The summing input is configured for adding together the output voltage and the output current. The error amplifier issues an error signal and adjusts the error signal dependent at least in part upon the output voltage and the output current. A comparator receives the error signal. The comparator has a ramp input electrically connected to a voltage ramp signal. The comparator issues an output signal that is based at least in part upon said error input. A power switch has an on condition and an off condition, and supplies dc current to the load when in the on condition. The power switch has a control input electrically connected to the comparator output signal.

Address:

6726 Chauncey Dr, Raleigh, NC 27615

VIN:

JM1BK34L771713314

Make:

MAZDA

Model:

MAZDASPEED MAZDA3

Year:

2007