Richard Maurice Hester

US Patent:

7061778, Jun 13, 2006

Filed:

Jun 7, 2004

Appl. No.:

10/862223

Inventors:

Arthur B. Odell - Cupertino CA, US
Richard L. Hester - San Jose CA, US
Jason E. Cuadra - San Jose CA, US

Assignee:

Power Integrations, Inc. - San Jose CA

International Classification:

H02M 3/335

US Classification:

363 2101

Abstract:

A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positive and negative input supply rails. A flyback energy transfer element having a flyback input winding and a forward energy transfer element having a forward input winding are also included. The flyback and forward input windings are coupled between the positive and negative input supply rails. Voltage control circuitry coupled to the forward energy transfer element is also included to reduce a voltage across the forward input winding, substantially to zero, when the power converter input voltage falls below a first threshold value.

US Patent:

7209371, Apr 24, 2007

Filed:

May 12, 2006

Appl. No.:

11/432968

Inventors:

Arthur B. Odell - Cupertino CA, US
Richard L. Hester - San Jose CA, US
Jason E. Cuadra - San Jose CA, US

Assignee:

Power Integrations, Inc. - San Jose CA

International Classification:

H02M 3/335
H02M 7/537

US Classification:

363 2101, 363131

Abstract:

A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positive and negative input supply rails. A flyback energy transfer element having a first input winding and a forward energy transfer element having a forward input winding are also included. The flyback and forward input windings are coupled between the positive and negative input supply rails. Voltage control circuitry coupled to the forward energy transfer element is also included to reduce a voltage across the forward input winding, substantially to zero, when the power converter input voltage falls below a first threshold value.

US Patent:

7403402, Jul 22, 2008

Filed:

Mar 13, 2007

Appl. No.:

11/724004

Inventors:

Arthur B. Odell - Cupertino CA, US
Richard L. Hester - San Jose CA, US
Jason E. Cuadra - San Jose CA, US

Assignee:

Power Integrations, Inc. - San Jose CA

International Classification:

H02M 3/335

US Classification:

363 2101, 363 2104, 363 2112

Abstract:

A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positive and negative input supply rails. A flyback energy transfer element having a flyback input winding and a forward energy transfer element having a forward input winding are also included. The flyback and forward input windings are coupled between the positive and negative input supply rails. Voltage control circuitry coupled to the forward energy transfer element is also included to reduce a voltage across the forward input winding, substantially to zero, when the power converter input voltage falls below a first threshold value.

US Patent:

20120223795, Sep 6, 2012

Filed:

Mar 2, 2011

Appl. No.:

13/039190

Inventors:

Richard Laudale Hester - San Jose CA, US

Assignee:

Power Integrations, Inc. - San Jose CA

International Classification:

H01F 27/02

US Classification:

336 90

Abstract:

A shroud includes a shrouding element and a window. The shrouding element is adapted to substantially cover either a first winding portion or a second winding portion of a vertical bobbin. The window, which is formed in the shrouding element, allows access to the first winding portion or the second winding portion (whichever is substantially covered by the shrouding element) through the shrouding element. The vertical bobbin has electrical terminals on a single end of its center axis and is designed to lie perpendicular to the PCB.

US Patent:

20120223799, Sep 6, 2012

Filed:

May 9, 2011

Appl. No.:

13/103447

Inventors:

Richard Laudale Hester - San Jose CA, US
Jason Cuadra - San Jose CA, US

Assignee:

POWER INTEGRATIONS, INC. - San Jose CA

International Classification:

H01F 27/28

US Classification:

336220

Abstract:

A transformer assembly includes a vertical bobbin and a shrouding element. The vertical bobbin includes a first winding portion, a second winding portion, and a flange. The flange is disposed between the first winding portion and the second winding portion. The flange includes a flange edge. The shrouding element, which substantially covers the first winding portion or the second winding portion, includes a shrouding edge that is operatively coupled to the flange edge. The flange edge and the shrouding edge have at least one complementary corrugation. In one example, the flange edge includes at least one groove and the shrouding edge includes at least one protrusion that is complementary to the groove. In another example, the shrouding edge includes at least one groove and the flange edge includes at least one protrusion that is complementary to the groove.