Light emitting diode driving circuit and light emitting diode lighting device

Abstract

The application relates to a light emitting diode driving circuit and a light emitting diode lighting device. The light emitting diode (LED) driving circuit comprises a detection circuit, a first-level converter, a first feedback loop, and a second feedback loop. The detection circuit detects whether the input of the driving circuit is low-frequency current or high-frequency current. The first-level converter converts the input of the driving circuit, and provides DC power suitable for LED. The first feedback loop is activated when the detection circuit detects that the input of the driving circuit is low-frequency current, the first feedback loop converts the current of an LED load into a feedback voltage and feeds back the feedback voltage to the first-level converter, the feedback voltage decreases when the current of the LED load is greater than a target value, and the feedback voltage increases when the current of the LED load is smaller than the target value. The second feedback loop is activated when the detection circuit detects that the input of the driving circuit is high-frequency current, the second feedback loop converts the current of the LED load into a feedback voltage and feeds back the feedback voltage to the first-level converter, the feedback voltage increases when the current of the LED load is greater than the target value, and the feedback voltage decreases when the current of the LED load is smaller than the target value.

Description

Technical field [0001] The present invention relates to the field of lighting driving, in particular to a light-emitting diode driving circuit and light-emitting diode lighting equipment compatible with AC mains (ACmains), traditional ballasts (CCG) and electronic ballasts (ECG). Background technique [0002] With the rise and continuous improvement of solid-state lighting technology, light-emitting diodes (LEDs) have become the preferred solution for today's lighting projects due to their high efficiency, energy saving, long life, and environmental protection, and are gradually being used in lighting products. A key factor that makes people pay attention to LED lighting technology is that it greatly reduces energy consumption and can achieve long-term reliable work. [0003] The LED tube is driven by DC. Whether it is powered by AC mains or CCG or ECG, a power adapter is required between AC mains, CCG and ECG and the LED, that is, an LED drive circuit. Its function is to convert ...

AI Technical Summary

Problems solved by technology

[0005] Currently, in the prior art, a drive circuit of a two-stage converter with a step-up power factor correction (PFC) converter and a buck converter is used to be compatible with AC mains, CCG, and ECG, but the two-stage converter The drive circuit has low efficiency and high cost

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