Scott E Ragona

US Patent:

20130154590, Jun 20, 2013

Filed:

Dec 15, 2011

Appl. No.:

13/327146

Inventors:

SCOTT E. RAGONA - Bethlehem PA, US
RENGANG CHEN - Hellertown PA, US
David Jauregui - Bethlehem PA, US

International Classification:

G05F 1/10

US Classification:

323271

Abstract:

Systems and methods for regulating a switching converter are disclosed. One embodiment of the present invention relates to a power supply system that comprises a switching converter that provides an output voltage by alternately turning on and off a high-side transistor and a low-side transistor both coupled to an output inductor through a switching node. The switching converter includes a drive circuit that regulates the output voltage based on a feedback signal. The power supply system also comprises a simulated output generator that generates and provides the drive circuit with a simulated inductor waveform as the feedback signal based on a low-side output waveform of the low-side transistor measured at the switching node during off-times of the switching converter.

US Patent:

20120025713, Feb 2, 2012

Filed:

Jul 30, 2010

Appl. No.:

12/804836

Inventors:

Thomas J. Ribarich - Laguna Beach CA, US
Scott E. Ragona - El Segundo CA, US

Assignee:

INTERNATIONAL RECTIFIER CORPORATION - EL SEGUNDO CA

International Classification:

H05B 37/00
G05F 1/613

US Classification:

315122, 323223

Abstract:

According to an exemplary embodiment, a shunt circuit includes a floating shunt switch configured to bypass at least one load, for example at least one LED, among a plurality of series-connected loads, such as a plurality of series-connected LEDs in a lighting system, responsive to a high-side control signal. The at least one load has terminals connected across the shunt circuit. The shunt circuit further includes a high-voltage level-shift up circuit configured to shift a low-side control signal up to the high-side control signal using a voltage of at least one of the terminals of the at least one load. The floating shunt switch can be configured to bypass the at least one load responsive to a failure of the at least one load.

US Patent:

20220271664, Aug 25, 2022

Filed:

Feb 23, 2022

Appl. No.:

17/678220

Inventors:

- Dallas TX, US
Preetam Charan Anand TADEPARTHY - Bengaluru, IN
Scott RAGONA - Bethlehem PA, US
Rengang CHEN - Center Valley PA, US
Evan Michael REUTZEL - Center Valle PA, US
Bhaskar RAMACHANDRAN - Coimbatore, IN

International Classification:

H02M 3/158
H02M 1/00
H02M 1/32

Abstract:

A device includes a current mirror, a switch, first and second current paths, first and second buffers, a variable resistor, a temperature-sensing circuit, and a controller. The first current path is coupled between the current mirror's input and the switch. The switch switches between ground and a transistor based on a control signal. The second current path is coupled between a first current mirror output and ground. The first buffer is coupled to a second current mirror output. The second buffer is coupled to the variable resistor, which is coupled to the first buffer. The temperature-sensing circuit provides a device temperature to the controller, which is coupled to a first buffer output and determines a first adjustment to the first and second current paths and a second adjustment to the variable resistor based on the device temperature.

US Patent:

20190173464, Jun 6, 2019

Filed:

Dec 5, 2017

Appl. No.:

15/831623

Inventors:

- Dallas TX, US
Frank Alexander Baiocchi - Allentown PA, US
Scott Edward Ragona - Philadelphia PA, US
Jonathan Almeria Noquil - Bethlehem PA, US

International Classification:

H03K 17/687
H03K 17/16
H03K 17/06
H02M 3/158

Abstract:

One example relates to a circuit that includes a first integrated circuit die and a second integrated circuit die. The first integrated circuit die has a power field effect transistor (FET) and a pull-down FET coupled to the power FET. The second integrated circuit die has a pull-up FET coupled to the power FET.