公开(公告)号：US09883554B2

公开(公告)日：2018-01-30

申请号：US15276253

申请日：2016-09-26

Applicant: Microchip Technology Incorporated

Inventor： Scott Lynch

IPC: H05B33/08

CPC classification number: H05B33/0812 ,  H05B33/083

Abstract: A sequential linear LED driver circuit is provided. The sequential linear LED driver circuit may include a plurality of current sinks, wherein each of the plurality of current sinks is configured to be coupled to a segment of a string of light-emitting diodes (LEDs), and a voltage divider that generates a plurality of reference voltages, wherein each of the plurality of reference voltages is applied to a respective current sink of the plurality of current sinks. The output of each current sink of the plurality of current sinks may be connected at a summing node.

公开(公告)号：US09730280B2

公开(公告)日：2017-08-08

申请号：US15277566

申请日：2016-09-27

Applicant: Microchip Technology Incorporated

Inventor： Scott Lynch

IPC: H05B37/00 ,  H05B33/08 ,  H02M1/14

CPC classification number: H05B33/0812 ,  H02M1/14 ,  H05B33/083

Abstract: A ripple reduction circuit is provided. The ripple reduction circuit may include a ripple capacitor configured to drive at least a first segment of a string of light emitting diodes (LEDs), a first diode having an anode coupled to the ripple capacitor, and a cathode configured to be coupled to an input end of the first LED segment, a second diode having a cathode coupled to the ripple capacitor and the anode of the first diode, and an anode configured to be coupled between the first LED segment and a second LED segment of the string of LEDs, a third diode having an anode coupled to the ripple capacitor, and a cathode configured to be coupled to a last LED segment of the string of LEDs, and a fourth diode having a cathode coupled to the ripple capacitor and the anode of the third diode.

公开(公告)号：US20170099708A1

公开(公告)日：2017-04-06

申请号：US15277566

申请日：2016-09-27

Applicant: Microchip Technology Incorporated

Inventor： Scott Lynch

IPC: H05B33/08 ,  H02M1/14

CPC classification number: H05B33/0812 ,  H02M1/14 ,  H05B33/083

Abstract: A ripple reduction circuit is provided. The ripple reduction circuit may include a ripple capacitor configured to drive at least a first segment of a string of light emitting diodes (LEDs), a first diode having an anode coupled to the ripple capacitor, and a cathode configured to be coupled to an input end of the first LED segment, a second diode having a cathode coupled to the ripple capacitor and the anode of the first diode, and an anode configured to be coupled between the first LED segment and a second LED segment of the string of LEDs, a third diode having an anode coupled to the ripple capacitor, and a cathode configured to be coupled to a last LED segment of the string of LEDs, and a fourth diode having a cathode coupled to the ripple capacitor and the anode of the third diode.

公开(公告)号：US20170094733A1

公开(公告)日：2017-03-30

申请号：US15276253

申请日：2016-09-26

Applicant: Microchip Technology Incorporated

Inventor： Scott Lynch

IPC: H05B33/08

CPC classification number: H05B33/0812 ,  H05B33/083

Abstract: A sequential linear LED driver circuit is provided. The sequential linear LED driver circuit may include a plurality of current sinks, wherein each of the plurality of current sinks is configured to be coupled to a segment of a string of light-emitting diodes (LEDs), and a voltage divider that generates a plurality of reference voltages, wherein each of the plurality of reference voltages is applied to a respective current sink of the plurality of current sinks. The output of each current sink of the plurality of current sinks may be connected at a summing node.