公开(公告)号：EP3284321B1

公开(公告)日：2020-09-23

申请号：EP17794649.8

申请日：2017-05-26

申请人： TT Electronics Plc

发明人： CUSEY, James P. ,  POTTECK, Alain ,  TRUONG, Tri-Tue

IPC分类号： G01J1/02 ,  G01J1/08 ,  G01J1/42 ,  G01J1/32 ,  H05B45/10 ,  H05B45/14

公开(公告)号：EP3284321A1

公开(公告)日：2018-02-21

申请号：EP17794649.8

申请日：2017-05-26

申请人： TT Electronics Plc

发明人： CUSEY, James P. ,  POTTECK, Alain ,  TRUONG, Tri-Tue

IPC分类号： H05B33/08 ,  G01J1/02 ,  G01J1/42

摘要： A temperature compensation circuit for a light source (e.g., light emitting diode (LED)) whose radiant energy output decreases when ambient temperature increases includes a first circuit element for generating a first current that increases proportional to an increase in the ambient temperature, and a second circuit element for generating a second current that is first order independent of the ambient temperature. The circuit further includes a weighted current adder for generating a third current by combining the first and second currents with first and second weights applied to the first and second currents respectively. The circuit further includes a third circuit element responsive to the third current for supplying a fourth current to the light source to maintain a radiant energy output of the light source constant independent of the ambient temperature.