LED driving circuit and driving method

Abstract

The invention discloses an LED driving circuit and a driving method. The driving circuit comprises a control chip, a constant current driving module, a first switch tube, a second switch tube and a third switch tube, wherein a first LED particle, the first switch tube and the constant current driving module are connected in series to form a loop; a second LED particle, the second switch tube and the constant current driving module are connected in series to form a loop; a third LED particle, the third switch tube and the constant current driving module are connected in series to form a loop; the control chip is electrically connected to the control end of the constant current driving module, the control end of the first switch tube, the control end of the second switch tube and the control end of the third switch tube. According to the LED driving circuit and the driving method, working conditions of different LED particles can be controlled according to luminance, color temperature and color requirements set by a user to achieve the set effect, output current is stable without current overshoot, and extra power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to an LED driving circuit and a driving method. Background technique [0002] With the application and promotion of LED in the field of lighting, people have put forward new requirements for the comfort of home lighting. way to control. At present, most of the market uses a driver module, which outputs a constant voltage, and the load is multiple LED particles connected in parallel. In each LED particle branch, a resistor and a switch are connected in series. The resistor is used to limit the current and prevent the inconsistent voltage drop of the LED particles from causing LED damage. If the current is too large, adjust the duty cycle of the switch to adjust the LED current mixing ratio of each branch to obtain lighting effects of different colors and brightness. However, the resistance current limiting method cannot control the LED current well and increases the power consu...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems that the existing LED drive circuit with adjustable LED brightness, color temperature and color adopts a resistance current limiting method to control the LED current to be constant, the control effect is not good, and power consumption is increased, and a LED drive circuit is provided. Circuit and driving method, which can control the working state of different LED particles according to the brightness, color temperature and color requirements set by the user, to achieve the set effect, stable output current, no current overshoot, and reduce additional power consumption

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