公开(公告)号：US20180139811A1

公开(公告)日：2018-05-17

申请号：US15352062

申请日：2016-11-15

Applicant: Cree, Inc.

Inventor： Ashish Ekbote ,  Noe Gonzalez

IPC: H05B33/08 ,  H02M3/335 ,  H02M1/08 ,  H02M1/44

Abstract: A method of operating a switching power converter includes operating the switching power converter in a boundary conduction mode when a switching frequency of a switch in the switching power converter is below a switching frequency threshold such than an on time of the switch is adjusted based on a desired output power of the switching power converter, and operating the switching power converter in a discontinuous conduction mode when the switching frequency of the switch is above the switching frequency threshold such that one or more of the on time of the switch and a switching period of the switch are adjusted based on the desired output power of the switching power converter and the on time of the switch is clamped at a minimum switch on time.

公开(公告)号：US20180227995A1

公开(公告)日：2018-08-09

申请号：US15425615

申请日：2017-02-06

Applicant: Cree, Inc.

Inventor： Ashish EKBOTE ,  Noe Gonzalez ,  Robert Underwood

IPC: H05B33/08

CPC classification number: H05B33/0815

Abstract: A solid state light fixture includes a light emitting diode (LED) load and a driver circuit that is configured to supply a drive current to the LED load. The driver circuit may include a current supply module that is configured to reduce a drive current level during dimming of the solid state light fixture, where the current supply module is configured to operate in both a continuous conduction mode at a first dimming level and a discontinuous conduction mode at a second dimming level that is lower than the first dimming level.