LED drive power supply applicable to electronic transformer

Abstract

The invention discloses an LED driving power supply suitable for an electronic transformer. The current flowing through the inductor is controlled by a first control circuit to ensure that the electronic transformer can meet the requirements of the minimum load current under any load conditions. Therefore, in the entire AC cycle It can work normally, and the output voltage of the power stage circuit is kept basically constant; the current flowing through the LED load is controlled by the constant current control circuit to ensure that the LED load can emit light stably, with high control accuracy and fast response speed. The LED driving power supply of the present invention can match various electronic transformers on the traditional circuit structure, so that the LED loads can work normally without the phenomenon of lamp flickering.

Description

technical field [0001] The invention relates to the field of power supply, more specifically, relates to an LED driving power supply adapted to an electronic transformer. Background technique [0002] Many current lighting occasions use a large number of spotlights—that is, the MR16 lamp cup method, which is composed of two parts such as an electronic transformer and a quartz lamp that consumes a lot of power. It has become an irreversible trend to replace traditional quartz lamp lighting. However, in the process of replacing traditional quartz lamp lighting with LED lighting, there is a problem of mismatching input power and load characteristics. This is because the output of the electronic transformer in the traditional lighting circuit It is a high-frequency low-voltage AC power supply, and what LED needs is a DC constant current source. Therefore, an effective LED driving power supply is required for conversion. [0003] Such as figure 1 Shown is the circuit diagram of...

AI Technical Summary

Problems solved by technology

Since the electronic transformer is designed for resistive loads, in order to meet the normal operation of the transformer, it is required to maintain a minimum load current throughout the AC cycle. If the load current drops below this current, or a large load current transient causes its low Under the minimum load current, the electronic transformer will shut down during the AC cycle, causing the LED light to blink

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