LED full-voltage efficient linear driving circuit

Abstract

The embodiment of the invention discloses an LED full-voltage efficient linear driving circuit. The LED full-voltage efficient linear driving circuit comprises an LED load module and a working mode control module; the LED load module comprises a first load and a second load; the first load and the second load are connected to an output end of the external power supply, the working mode control module is connected to the output ends of the first load and the second load to form a loop, thereby enabling the first load and the second load to work as normal, and the working mode control module isfurther connected between the input end of the second load and the output end of the external power supply, the on-off between the second load and the external power supply can be controlled, therebycontrolling the serial-parallel connection way between the first load and the second load to realize the linear full-voltage driving of the LED string light; the working current of the LED load moduleis adjusted according to the voltage of the external power supply, so that the working current of each of the first load and the second load can be reduced along the boosting of the voltage, the LEDstring light can work efficiently, and other additional power consumption is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of LED driving, in particular to a full-voltage high-efficiency linear driving circuit for LEDs. Background technique [0002] LED is a semiconductor diode that can convert electrical energy into light energy. Since LED is a semiconductor device with sensitive characteristics and has negative temperature characteristics, it needs to be stabilized and protected during application, such as using LED as a display Or other lighting equipment or backlight, need to drive the LED. [0003] In the typical LED linear constant current driving mode in the prior art, the output power of the lamp is P out =U led × I out , where U led is the voltage of the light string, I out It is the current of the light string, and the linear power supply that usually uses 120Vac as the input voltage cannot work in the input environment of 220Vac, otherwise the driver chip will be damaged due to its excessive...

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Problems solved by technology

[0003] In the typical LED linear constant current driving mode in the prior art, the output power of the lamp is P out =U led × I out , where U led is the voltage of the light string, I out It is the current of the light string, and the linear power supply that usually uses 120Vac as the input voltage cannot work in the input environment of 220Vac, otherwise the driver chip will be damaged due to its excessive power consumption, and finally the LED lamps cannot be used normally; and 220Vac is used as the input Voltage linear power supply, because the voltage drop of the LED lamp bead is much greater than the pulsating DC voltage after rectification of the 120Vac line network, so within the input range of 120Vac, the voltage drop of the LED lamp bead cannot be reached, and the LED lamp cannot work normally

[0004] In order to meet the high efficiency requirements of customers, the existing LED lighting linear drivers usually work at a single voltage, which cannot meet the full-voltage working requirements of high and low voltages, and when working at high and low voltages, it will lead to power inconsistencies.

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