High-power LED (light-emitting diode) phase-control constant-current drive circuit

Abstract

The invention relates to a high-power LED (light-emitting diode) phase-control constant-current drive circuit. The drive circuit is characterized in that mains supply input in one way is output to a high-power LED circuit module for power supply via a phase-control rectifier module, and mains supply input in the other way is isolated by an isolation transformer and then is taken as input of a synchronous signal and a regulated power supply of a synchronous phase-shift circuit; a direct current (DC) detection module detects the output of the high-power LED circuit, and an output signal of the circuit is taken as a feedback signal of a regulating circuit; the output of the regulated power supply is connected with a preset circuit module; the output of a preset circuit is taken as a preset signal of the regulating circuit; the output of the regulating circuit is connected with the synchronous phase-shift circuit; and the output of a phase-control rectifier circuit is adjusted by means ofthe output of the synchronous phase-shift circuit, thus achieving the purpose of constant-current drive for the high-power LED circuit. The drive circuit has the advantages of novel control strategy and high intellectualization degree, thus having greater development prospect in application fields such as a high-power LED lamp and a large LED display screen.

Description

technical field [0001] The invention relates to a phase-controlled constant current high-power LED driving circuit, which is suitable for high-power LED lamps and large-screen LED display screens. Background technique [0002] Existing high-power LED drive circuits all use switching power supplies with complex circuits and high costs as the drive circuit. Due to the high temperature of the LED working environment, the components of the switching power supply are easy to age and have high failure rates. LED products have low reliability and high damage rate during operation. Contents of the invention [0003] In view of this, the purpose of the present invention is to provide a phase-controlled constant current high-power LED drive circuit, which can change the conduction angle of a thyristor to achieve constant current by measuring the total current on the LED path and comparing it with a given value. The purpose of providing high-power LED current. [0004] The present ...

AI Technical Summary

Problems solved by technology

[0002] The existing high-power LED drive circuits all use complex circuit and high-cost switching power supply as the drive circuit

Due to the high temperature of the LED working environment, the components of the switching power supply are easy to age and have high failure rates. The reliability of LED products is low during operation and the damage rate is high.

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