Light-emitting diode (LED) power supply driving circuit

Abstract

The invention discloses a light-emitting diode (LED) power supply driving circuit, which is used for being electrically connected with external alternating current and controlling an LED lamp, and comprises a rectifier bridge, a driving power module and a photoelectric coupler, wherein the rectifier bridge is used for converting the alternating current into direct current; the driving power module is used for outputting constant current and driving the LED lamp; and the photoelectric coupler is used for isolating, feeding back or correcting the output constant current. By the circuit, current fluctuation of the LED lamp can be automatically detected, fed back or corrected, stable and high-efficiency constant current is output through a field effect transistor, and the whole power supply driving circuit stably and reliably works and has the advantages that: high-frequency switch oscillation, electromagnetic radiation and high-frequency interference are not generated, vibration noise is absent, ripple resistance and interference resistance are high, electric energy efficiency is over 90 percent, the circuit has an anti-overload / overshoot protection function, and the like.

Description

technical field [0001] The invention relates to the field of LEDs, in particular to an LED power drive circuit. Background technique [0002] Existing LED power drive circuits usually use high-frequency switching ICs such as PWM (Pulse Width Modulation, pulse width modulation) to control the constant current drive circuit. High-frequency interference, etc., as well as vibration and noise, strong anti-interference ability, and the power utilization rate is not high below 80%, which wastes power and does not use it to protect the environment. It is also not enough for lightning protection, overload protection, overshoot protection and other shortcomings. The constant current power supply made with this circuit drives LED lights, works stably, has no noise, no flicker or other optical vibrations, no high-frequency radiation and saves electricity. [0003] Therefore, how to solve the above technical problems is an urgent technical problem in the industry. Contents of the inve...

AI Technical Summary

Problems solved by technology

[0002] Existing LED power drive circuits usually use high-frequency switching ICs such as PWM (Pulse Width Modulation, pulse width modulation) to control the constant current drive circuit. High-frequency interference, etc., as well as vibration and noise, strong anti-interference ability, and the power utilization rate is not high below 80%, which wastes power and does not use environmental protection

There are also shortcomings such as lightning protection, overload protection, and overshoot protection. The constant current power supply made with this circuit drives LED lights, which works stably, has no noise, no flicker or other optical vibrations, no high-frequency radiation, and saves power.

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