Special switching power supply for high current pulse LED (Light Emitting Diode)

Abstract

The invention provides a special switching power supply for a high current pulse LED (Light Emitting Diode). The special switching power supply for the high current pulse LED comprises an AC-DC (Alternating Current-Direct Current) converter, a PFC (Power Factor Correction) functional circuit, a constant current / constant voltage circuit and a PWM control circuit, wherein an LED is connected to an output end of the constant current / constant voltage circuit in series; the special switching power supply for the high current pulse LED also comprises a field-effect transistor, a photodiode and a thermoelectric couple, wherein the field-effect transistor is connected to the output end of the constant current / constant voltage circuit in series and connected with a PWM (Pulse Width Modulation) control circuit via a wire; a brightness and temperature signal of the LED light can be reflected by the photodiode and the thermoelectric couple and transmitted to the PWM control circuit. According to the invention, higher transient intensity of the LED is obtained through an alternate on-off mode of setting pulse width to adjust PWM reference current or voltage to be a plurality of times larger than a conventional working value; the power-on time within unit time is reduced without reducing the average luminous flux of the LED so as to reduce the heating of the LED chip without power; and the luminous efficiency of the LED in the power supply driving direction is increased.

Description

technical field [0001] The invention relates to the technical field of LED luminous efficiency, in particular to a high-current pulse LED dedicated switching power supply. Background technique [0002] Light-emitting diode (LED) was invented in the 1960s. LED has the advantages of small size, long life, low power consumption, fast response, good shock resistance, etc., and is widely used in signal indication, digital display and other fields. With the continuous improvement of luminescent materials, the development of high-brightness LEDs has been successful, especially the successful development of white-light high-brightness LEDs, making it widely used in indoor and outdoor decoration, even urban street lighting and civil lighting. However, the driving of high-brightness LEDs is a problem that needs to be solved. In the existing constant voltage or constant current LED power supply mode, 90% of the electric power is converted into heat energy, which not only has low effici...

AI Technical Summary

Problems solved by technology

However, the driving of high-brightness LEDs is a problem that needs to be solved. In the existing constant voltage or constant current LED power supply mode, 90% of its electric power is converted into heat energy, which not only has low efficiency, but also greatly accelerates the light decay period of LEDs.

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