公开(公告)号：US11026305B1

公开(公告)日：2021-06-01

申请号：US16861282

申请日：2020-04-29

申请人： APOGEE LIGHTING HOLDINGS, LLC

发明人： Frank Zarcone ,  James D. Chermak ,  Fred Katz

IPC分类号： H05B45/10 ,  H05B45/35 ,  H05B45/46

摘要： A balance circuit includes a reference circuit configured to generate current through strings of light emitting diodes (LEDs). The reference circuit includes a first string of LEDs in series coupled to a collector node of a first transistor. A base drive current resistor is connected between the collector node and a base node of the first transistor. A base emitter resistor is connected between the base node and an emitter of the first transistor such that a reference voltage is generated on the base node during operation. Another stage receives the reference voltage to generate a tracking current through a second transistor and a second string of LEDs connected to a base of the second transistor, wherein a current through the first string of LEDs is uniformly tracked by the tracking current through the second string of LEDs.

公开(公告)号：US10897799B1

公开(公告)日：2021-01-19

申请号：US16677962

申请日：2019-11-08

申请人： APOGEE LIGHTING HOLDINGS, LLC

发明人： Frank Zarcone ,  James D. Chermak ,  Fred Katz

IPC分类号： H05B45/14 ,  F21V23/00 ,  H05B45/35 ,  F21Y115/10

摘要： A balance circuit includes a node on which a reference voltage is generated to control current through a first component string and a first resistor connected to the first component string. A stage receives the reference voltage to generate a tracking current through a second component string and a second resistor connected to the second component string, wherein a current through the first component string is uniformly tracked by the tracking current through the second component string.

公开(公告)号：US20210144817A1

公开(公告)日：2021-05-13

申请号：US16861282

申请日：2020-04-29

申请人： APOGEE LIGHTING HOLDINGS, LLC

发明人： Frank Zarcone ,  James D. Chermak ,  Fred Katz

IPC分类号： H05B45/10 ,  H05B45/46 ,  H05B45/35

摘要： A balance circuit includes a reference circuit configured to generate current through strings of light emitting diodes (LEDs). The reference circuit includes a first string of LEDs in series coupled to a collector node of a first transistor. A base drive current resistor is connected between the collector node and a base node of the first transistor. A base emitter resistor is connected between the base node and an emitter of the first transistor such that a reference voltage is generated on the base node during operation. Another stage receives the reference voltage to generate a tracking current through a second transistor and a second string of LEDs connected to a base of the second transistor, wherein a current through the first string of LEDs is uniformly tracked by the tracking current through the second string or LEDs.