Control circuit, control method and LED driving circuit thereof
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United States of America Patent
Stats
-
Jan 16, 2018
Grant Date -
Nov 2, 2017
app pub date -
Apr 24, 2017
filing date -
Apr 29, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A control circuit for an LED driving circuit having a rectifier and a power transistor for driving an LED load, can include: a control signal regulation circuit configured to control a driving voltage of the power transistor to vary with a rectifier output voltage to control the variation of a current flowing through the power transistor to be consistent with that of the rectifier output voltage to decrease a power loss of the power transistor; and the control signal regulation circuit being configured to control the driving voltage of the power transistor to vary with the rectifier output voltage to control the variation of the current flowing through the power transistor to be opposite to that of the rectifier output voltage to improve a power factor of the LED driving circuit.
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