785 results about "Light driven" patented technology

The invention discloses a lighting driving circuit and a lighting system. A constant current control circuit of the invention is provided with an instantaneous value current-limiting function; the output current under a certain range of input voltage achieves the constant current effect in the absence of a silicon controlled light dimmer; with the help of the silicon controlled light dimmer, when a conduction angle is greater than a certain value, the instantaneous value of the output current does not achieve the current-limiting value, the circuit is worked at an constant current output state; when the conduction angle is less than a certain value, the instantaneous value of the output current achieves the current-limiting value, the output current is limited, the average value of the output current is reduced, thereby realizing the light-dimming. Therefore, the scheme can be compatible with two conditions of the existence of inexistence of the silicon controlled light dimmer, the compatibility is high; through the adding of a leakage circuit, the error shutoff of the controlled silicon caused by the condition that the output current is lower than the maintenance current can be prevented, thereby guaranteeing the stabilization of the output current of the system and preventing the system from flickering.