The invention relates to the technical field of LED drive circuits, in particular to a linear LED drive circuit for
silicon controlled dimming. The technical problems that in the prior art, when overshoot
flicker at the turn-on moment is achieved and
critical voltage is reached, channels are switched repeatedly to cause switch
flicker are solved. The linear LED drive circuit mainly comprises a power source, a
silicon controlled switching circuit, a
rectifier bridge, an integral circuit and a drive circuit, wherein a
silicon controlled drive power circuit is formed by the power source, the silicon controlled switching circuit and the
rectifier bridge; the integral circuit comprises a power source potential point and a sampling potential point, wherein the
voltage values of the power source potential point and the sampling potential point are reduced in sequence, and the output end of the
rectifier bridge is connected to the power source potential point; the drive circuit comprises a switch control and
processing circuit, and the switch control and
processing circuit controls a first switch
transistor of a drive circuit
discharge channel and a second switch
transistor of a drive circuit LED channel to be connected or disconnected through
voltage of the sampling potential point; the switch control and
processing circuit comprises a
hysteresis comparator and an
LED lamp, the input end of the
hysteresis comparator is connected to the sampling potential point, and the maximum potential point of the
LED lamp is connected with the output end of the rectifier bridge. The invention is used for designing the LED drive circuit.