Mark A Jutras from 10 Howarth Dr, West Upton, MA 01568, age 62, Phone: (617)8235604

Medicine Doctors

Mark L. Jutras

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Specialties:

Reproductive Endocrinology

Work:

Advanced Reproductive Concepts
9800 Kincey Ave STE 160, Huntersville, NC 28078
(704)9479000 (phone), (704)9921900 (fax)

Education:

Medical School
University of Texas Medical Branch at Galveston
Graduated: 1982

Languages:

English

Description:

Dr. Jutras graduated from the University of Texas Medical Branch at Galveston in 1982. He works in Huntersville, NC and specializes in Reproductive Endocrinology. Dr. Jutras is affiliated with Lake Norman Regional Medical Center and Novant Health Huntersville Medical Center.

Us Patents

Transient Override Circuit For A Voltage Regulator Circuit
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US Patent:

6696882, Feb 24, 2004
Filed:

Jun 22, 2000
Appl. No.:

09/599280
Inventors:

Piotr Markowski - Bellingham MA
Mark S. Masera - Framingham MA
Mark A. Jutras - Upton MA
Assignee:

Artesyn Technologies, Inc. - Boca Raton FL
International Classification:

G05F 302
US Classification:

327531, 327530, 323285, 323290, 363 2101, 363 65
Abstract:

A circuit for providing a regulated voltage to a load. The circuit includes a power converter coupled to the load and including at least one pulse-width modulated switching device, a control circuit for providing a pulse-width modulated control signal to the pulse-width modulated switching device of the power converter based on an output voltage of the power converter, and a transient override circuit responsive to a load voltage for biasing the pulse-width modulated switching device conductive during certain load voltage conditions.

Led Ballast Power Supply Having Digital Controller
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US Patent:

8395329, Mar 12, 2013
Filed:

Aug 26, 2010
Appl. No.:

12/868965
Inventors:

Mark Jutras - Upton MA, US
Mark Masera - North Grafton MA, US
Scott Moore - Westford MA, US
Assignee:

Bel Fuse (Macao Commercial Offshore) - Andar H-K
International Classification:

G05F 1/00
H05B 37/02
H05B 39/04
H05B 41/36
H05B 41/16
H05B 41/24
US Classification:

315291, 315307, 315246, 363 2115
Abstract:

A power supply for an LED lamp has a set of coupled coils, primary-side power circuitry including a converter power switch for conducting input power, and secondary-side power circuitry including a dimming power switch. Power control circuitry includes converter control circuitry which generates a converter control signal for the converter power switch to maintain a desired undimmed level of lamp current at a normal operating value of a lamp voltage. Dimming control circuitry generates a dimming control signal for the dimming power switch to pulse-width modulate the lamp current at a duty cycle corresponding to a desired dimming. Operation of the converter control circuitry is modified during dimming to prevent an automatic increase of the lamp voltage in response to a decrease in lamp current, avoiding undesirable overshooting of the lamp current and providing more accurate and effective control over dimming operation.

Dc-To-Dc Converter Having Secondary-Side Digital Sensing And Control
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US Patent:

8581565, Nov 12, 2013
Filed:

Apr 23, 2012
Appl. No.:

13/453534
Inventors:

Zhao Tang - Zhejiang, CN
Jia Deng - Zhejiang, CN
Yuanping Zhou - Zhejiang, CN
Hongliang Lu - Zhejiang, CN
Mark Jutras - Upton MA, US
Assignee:

Bel Fuse (Macao Commercial Offshore) Limited - Andar H-K
International Classification:

G05F 1/575
H02M 1/36
US Classification:

323283, 323238, 323901, 363 49, 363 65
Abstract:

A DC/DC converter for use in power supply applications employing multiple parallel-connected converters employs a digital controller referenced to the secondary or output side of an isolation boundary and having non-isolated direct connections to secondary side components. The controller directly monitors output voltage and output current and uses feedback control techniques to precisely control these values in a desired manner. The DC/DC converter can implement so-called “droop” current sharing with increased accuracy arising from the secondary-side digital control, so that a desired balanced sharing of current across multiple converters can be achieved. The converter uses calibration establish accurate set points, and any of a variety of additional functions/features to attain operational goals.

Buck Regulator With Adaptive Auxiliary Voltage Flyback Regulator
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US Patent:

20030016545, Jan 23, 2003
Filed:

May 30, 2002
Appl. No.:

10/159699
Inventors:

Mark Jutras - Upton MA, US
Mark Masera - Grafton MA, US
Assignee:

Bel-Fuse, Inc.
International Classification:

H02M003/335
US Classification:

363/018000
Abstract:

A DC/DC converter which includes a switched mode power supply, such as a switched mode buck regulator, has gate driven switching devices. A flyback converter is provided for providing a gate drive voltage to the gate driven switching devices. The flyback converter increases or decreases an input voltage to provide the gate drive voltage. A programmable under voltage lockout circuit is provided for turning ON of the flyback converter if the input voltage is lower than a predetermined value. A plurality, n, of buck regulators are connected in parallel and are controlled by a common controller which provides pulse width modulation signals to each power stage which are shifted by 360/n from each other.

Buck Regulator With Adaptive Auxiliary Voltage Flyback Regulator
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US Patent:

20040145922, Jul 29, 2004
Filed:

Jan 13, 2004
Appl. No.:

10/756866
Inventors:

Mark Jutras - Upton MA, US
Mark Masera - Grafton MA, US
Assignee:

Bel-Fuse, Inc.
International Classification:

H02M003/335
US Classification:

363/018000
Abstract:

A DC/DC converter which includes a switched mode power supply, such as a switched mode buck regulator, has gate driven switching devices. A flyback converter is provided for providing a gate drive voltage to the gate driven switching devices. The flyback converter increases or decreases an input voltage to provide the gate drive voltage. A programmable under voltage lockout circuit is provided for turning ON of the flyback converter if the input voltage is lower than a predetermined value. A plurality, n, of buck regulators are connected in parallel and are controlled by a common controller which provides pulse width modulation signals to each power stage which are shifted by 360/n from each other.

Distributed Power Supply System With Digital Power Manager Providing Digital Closed-Loop Power Control
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US Patent:

20110234000, Sep 29, 2011
Filed:

Mar 10, 2011
Appl. No.:

13/044965
Inventors:

Jiajia Yan - Hangzhou, CN
Yuanping Zhou - Hangzhou, CN
Huajun Jian - Hangzhou, CN
Mark Jutras - Upton MA, US
Assignee:

BEL FUSE (MACAO COMMERCIAL OFFSHORE) LIMITED - Andar H-K
International Classification:

H02J 1/00
US Classification:

307 31
Abstract:

A power supply system includes a digital power manager and multiple power blocks each conveying regulated power to a respective load. The power blocks include the power part of non-isolated DC/DC converters, signal sampling and conversion circuits to provide analog voltage signal representing output voltage, output current, temperature, etc., and driving circuits to receive pulse width modulation (PWM) signals and drive switching devices. Closed-loop voltage control and protection functions for the power blocks are integrated into the digital power. The digital power manager includes a non-volatile memory containing registers, including a digital power manager configuration register, a power block set-up register, and a power block monitor register, as well as a user-definable space. The digital power manager programs and monitors operation of each power block, and may also include a user interface, such as an I2C interface, for receiving programming data from a host user system and send monitoring data thereto.

Regulated Power Supply Using Multiple Load Sensing
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US Patent:

54481554, Sep 5, 1995
Filed:

Nov 28, 1994
Appl. No.:

8/345535
Inventors:

Mark A. Jutras - Upton MA
Assignee:

International Power Devices, Inc. - Brighton MA
International Classification:

G05F 1565
US Classification:

323285
Abstract:

A regulated power source for supplying power to a circuit, the power source including a regulated power converter generating an output voltage for the circuit, the converter including a control terminal through which the output voltage can be regulated by feedback from the circuit; a monitoring circuit including a plurality of input terminals each of which monitors a voltage at a different location on the circuit, the monitoring circuit producing a control signal that is a function of all of the monitored voltages at the plurality of input terminals, the control signal driving the control terminal of the regulated power converter so as to regulate the output voltage to maintain the control signal at a constant value.

Multiple Output Voltages From A Cascaded Buck Converter Topology
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US Patent:

58865080, Mar 23, 1999
Filed:

Aug 29, 1997
Appl. No.:

8/920678
Inventors:

Mark A. Jutras - Upton MA
Assignee:

Computer Products, Inc. - Fremont CA
International Classification:

G05F 1577
US Classification:

323267
Abstract:

A buck converter in accordance with the present invention provides multiple, well regulated, low voltage outputs. A cascaded buck converter comprises a main buck converter that is coupled to a subordinate buck converter through a cascade transistor in series with the free wheeling diode or transistor. The main buck converter is coupled to the free wheeling diode through the cascade transistor. Additional voltage outputs are possible by placing additional subordinate buck converters in series with the cascade transistor. An isolated forward converter with multiple output voltages in accordance with the present invention may be derived using the cascaded buck converter topology. The cascading configuration permits multiple voltage outputs using a minimum number of switching devices while avoiding undesirable cross regulation.