Mark S Masera

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.

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.

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.

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.

US Patent:

20180034270, Feb 1, 2018

Filed:

Jul 26, 2017

Appl. No.:

15/660637

Inventors:

- Andar H-K, MO
Scott MOORE - Westford MA, US
Mark MASERA - North Grafton MA, US

International Classification:

H02J 3/00
H02J 3/14

Abstract:

A power switch includes a bridge-connected switching circuit with (1) a pair of MOSFETs back-to-back in series between line and load connections, an interconnection point of the MOSFETs being a first common connection, and (2) a pair of diodes back-to-back between the line and load connections, an interconnection point of the diodes being a second common connection. A line/load controller has supply inputs connected to the first and second common connections for receiving operating power, and (1) places both MOSFETs in the ON state to deliver normal operating current to the load for normal operation, and (2) places both MOSFETs in the OFF state to deliver (by body diode conduction) a substantially reduced leakage current to the load when the load is not powered for normal operation, the leakage current providing the operating power to the line/load controller.

US Patent:

20140340941, Nov 20, 2014

Filed:

Sep 17, 2013

Appl. No.:

14/029222

Inventors:

- ANDAR H-K, MO
Mark Masera - North Grafton MA, US

Assignee:

BEL FUSE (MACAO COMMERICAL OFFSHORE) LIMITED - ANDAR H-K

International Classification:

H02M 3/335

US Classification:

363 2101

Abstract:

A regulated switching power converter generates a converter output having first and second regulated output values under corresponding operating conditions. The converter output transitions between the first and second output values in response to transition of a trigger signal in a transition window between first and second trigger values. A transition step function is based on transition amplitude, transition interval and number of steps, the transition amplitude being a difference between the first and second regulated output values, and the transition interval being a difference between the first and second trigger values. The transition step function generates a step-like transition signal based on values of the trigger signal between the first and second trigger values. During operation in the transition window, the step-like transition signal is included in the regulation reference value to generate a step-like transition of the converter output between the first and second regulated output values.