LED drive power supply applicable to electronic transformer

Abstract

The invention discloses an LED drive power supply applicable to an electronic transformer. A first control circuit is used for controlling current which flows through an inductor so as to ensure that the electronic transformer can meet the requirements of the minimum load current under any loads, therefore the electronic transformer can normally work at the whole AC cycle and keep the output voltage of the power stage circuit substantially constant; and a steady-flow control circuit is used for controlling current which flows through an LED load so as to ensure that the LED load can steadily light, and high control precision and high response speed are achieved. The LED drive power supply provided by the invention can be matched with various electronic transformers in a conventional circuit structure and enables all the LED loads to work normally without 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

Images