LED control circuit

Abstract

The invention relates to an LED control circuit, which comprises a current and pulse control module, a first voltage-controlled resistor, a voltage control module, a feedback module and a voltage regulation module, wherein the current and pulse control module comprises a first input end for receiving a micro-control signal, a second input end for receiving a voltage control signal, a third input end and connected to the ground and an output end; the first voltage-controlled resistor comprises an input end connected with an LED cathode and an output end and a control end which are respectivelyconnected with the third input end and the output end of the current and pulse control module; the voltage control module comprises the first input end for receiving the micro-control signal and a second input end and an output end which are connected with the LED cathode; the feedback module comprises a first input end connected with an LED anode and a second input end and an output end which are connected with the voltage control module; and the voltage regulation module comprises a first input end connected with a power supply voltage, a second input end connected with the output end of the feedback module and an output end connected with the LED anode. By regulating the voltage of the LED anode, the utilization ratio of a power supply can be improved effectively.

Description

technical field [0001] The invention relates to a control technology, in particular to an LED control circuit applied in a projector. Background technique [0002] LED has the advantages of low power consumption, long life, small size, and high light utilization rate. With the development of technology, it has become a reality for LED to replace traditional lighting bulbs and apply them in various fields. [0003] The application of LED in the field of projectors is due to the development of high-brightness LED technology; because LED has a life span of up to 100,000 hours, compared with traditional halogen bulbs or high-pressure mercury bulbs with a life span of about 3,000 hours, its advantages are very obviously. LED greatly improves the lifespan of projectors, so the factors that restricted the development of projectors in the past can be solved, making the projector market more broad and competitive. [0004] The characteristic of high-brightness LEDs is that the curr...

AI Technical Summary

Problems solved by technology

However, since the voltage consumed by each LED is different, and it varies with the temperature of the LED, the current flowing through it, and the difference between the monomers, so in the fixed voltage mode, some LEDs that require a lower voltage waste more power. However, some LEDs that require higher voltage may not work normally, and the direct consequence is that the power and brightness of the projector deviate greatly.

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