公开(公告)号：US20180255629A1

公开(公告)日：2018-09-06

申请号：US15969255

申请日：2018-05-02

Applicant: Lutron Electronics Co., Inc.

Inventor： Venkatesh Chitta ,  Russell L. MacAdam ,  Matthew R. Zartman

IPC: H05B41/39 ,  H05B33/08 ,  H05B37/02 ,  H05B41/392 ,  H05B41/38

CPC classification number: H05B41/39 ,  H05B33/0809 ,  H05B33/0845 ,  H05B37/02 ,  H05B41/38 ,  H05B41/392

Abstract: An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp.

公开(公告)号：US20170188430A1

公开(公告)日：2017-06-29

申请号：US15460973

申请日：2017-03-16

Applicant: Lutron Electronics Co., Inc.

Inventor： Timothy P. Gredler ,  Matthew R. Zartman

IPC: H05B33/08

CPC classification number: H05B33/0845 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0851 ,  H05B33/0887 ,  H05B33/089 ,  H05B37/02 ,  H05B37/0209

Abstract: A load control device for controlling the intensity of a lighting load, such as a light-emitting diode (LED) light source, may include a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage, a load regulation circuit operable to receive the bus voltage and to control the magnitude of a load current conducted through the lighting load, and a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity. The control circuit may control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold.

公开(公告)号：US09635726B2

公开(公告)日：2017-04-25

申请号：US15291308

申请日：2016-10-12

Applicant: Lutron Electronics Co., Inc.

Inventor： Timothy P. Gredler ,  Matthew R. Zartman

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0845 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0851 ,  H05B33/0887 ,  H05B33/089 ,  H05B37/02 ,  H05B37/0209

Abstract: A load control device for controlling the intensity of a lighting load, such as a light-emitting diode (LED) light source, may include a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage, a load regulation circuit operable to receive the bus voltage and to control the magnitude of a load current conducted through the lighting load, and a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity. The control circuit may control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold.