LED (Light Emitting Diode) driving circuit

Abstract

The invention discloses an LED (Light Emitting Diode) driving circuit. The driving circuit comprises an AC / DC (Alternating Current / Direct Current) rectifier circuit, an integrated circuit, a step-down circuit and a voltage detection circuit, wherein the AC / DC rectifier circuit is used for converting alternating current into direct current and outputting the direct current to the integrated circuit and the step-down circuit; the step-down circuit is used for providing working current for an LED module; the integrated circuit comprises a PWM (Pulse Width Modulation) control module, an OCP (Over Current Protection) module, an OVP (Over Voltage Protection) module and a frequency control module; the OCP module is used for detecting working current of the LED module through a current detection point of the LED module; the OVP module is used for detecting working voltage of the LED module through a voltage detection point of the voltage detection circuit; the frequency control module is used for controlling PWM wave duty ratio of the PWM control module according to the detection result; and the PWM control module is used for responding the control of the frequency control module, outputting PWM wave with corresponding duty ratio and adjusting the working current of the LED module. In the invention, high voltage directly acts on the integrated circuit; and the driving circuit has the advantages of short system starting time and quick response of protection of the LED module.

Description

technical field [0001] The invention relates to an LED driving circuit. Background technique [0002] The existing LED drive circuit has many external components and complex design, resulting in high circuit cost. Moreover, the step-down of the voltage by the transformer makes the LED drive circuit bulky and takes a long time to start the system. The system detects whether the working status of the LED module is normal and responds slowly to protect the LED module. In addition, the LED module adopts multi-channel parallel connection, which may easily cause different LED currents and affect the life of the LED. Contents of the invention [0003] In view of this, it is necessary to provide an LED driving circuit to solve the above problems. [0004] An LED drive circuit, including an AC / DC rectifier circuit, an integrated circuit, a step-down circuit, an LED module, and a voltage detection circuit, the AC / DC rectifier circuit is used to convert alternating current into dir...

AI Technical Summary

Problems solved by technology

[0002] Due to the many peripheral components and complex design of the existing LED drive circuit, the cost of the circuit is high

And through the step-down of the transformer, the size of the LED drive circuit is large, and it takes a long time for the system to start. The system detects whether the working status of the LED module is normal and the response of the action of protecting the LED module is slow.

In addition, the LED module adopts multi-channel parallel connection, which may easily cause different LED currents and affect the life of the LED.

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