led intelligent dimming drive circuit

Abstract

The invention provides an LED intelligent light adjustment driving circuit, which comprises an AC / DC rectification module, an MCU control unit, a DC / DC converter and an LED light source, wherein the AC / DC rectification module and the DC / DC converter are connected, an output end of the DC / DC converter is connected with the LED light source, the AC / DC rectification module consists of a controller, the MCU control unit is connected with the DC / DC converter and is also connected with the controller, the MCU control unit consists of a voltage detector which is used for detecting voltages at two ends of the DC / DC converter, when the voltage detector detects that the voltage at two ends of the DC / DC converter exceeds a preset value, the MCU control unit sends a control signal to the controller, the controller adjusts the voltage output to the DC / DC converter from the AC / DC rectification module according to the control signal. By adopting the LED intelligent light adjustment driving circuit, the output voltage of the AC / DC rectification module is changed along with the voltage at two ends of the DC / DC converter, and the difference of the two is constant within a small preset value, so that the high efficiency of a driver can be guaranteed.

Description

technical field [0001] The invention relates to a control circuit of an LED lighting lamp, in particular to an LED intelligent dimming drive circuit. Background technique [0002] With the development of technology and the improvement of people's living standards, in the field of lighting, LED light sources are more and more widely used because of their advantages of high luminous efficiency, low heat generation, power saving and long life. With the continuous development of LED technology, there are more and more LED drive circuits, which can be roughly divided into three types: resistance current-limited drive, constant current drive and constant voltage drive. Because it is often used in a single drive mode, problems such as poor adjustment performance, poor color fidelity, or difficult adjustment can occur. For example, the authorized announcement date was September 15, 2010, and the Chinese patent application number 200920261721.2 is a utility model named "LED Drive Ci...

AI Technical Summary

Problems solved by technology

Poor tuning, poor color fidelity, or difficult tuning due to often single drive mode use

For example, the authorized announcement date was September 15, 2010, and the Chinese patent application number 200920261721.2 is a utility model named "LED Drive Circuit", which includes a filter circuit, a rectifier filter circuit, a PWM control circuit with PFC correction, a switching transformer, and a power switch. , Output rectification filter circuit and loop control circuit, through the PWM control circuit with PFC correction and the loop control circuit to form a compensation network of the voltage loop, to a certain extent, the negative feedback of the output voltage is realized, but only one level of drive is used Constant voltage control, it is difficult to maintain a constant voltage with a small error, so the efficiency of the driver is low

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