Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit

Abstract

The invention discloses a phase-shift processing based LED driving system. The phase-shift processing based LED driving system is characterized by comprising a transformer T, a rectification filter circuit, a phase-shift circuit, a driving circuit and an open-circuit protection circuit, wherein the rectification filter circuit is connected with a secondary side of the transformer T, the phase-shift circuit is connected with the rectification filter circuit, the driving circuit is connected with the phase-shift circuit, and the open-circuit protection circuit is connected with the driving circuit. The phase-shift circuit comprises a phase-shift chip U1, a triode VT1, a triode VT2, a resistor R2, a capacitor C2 and the like, wherein one end of the resistor R2 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R2 is connected with an IN1 pin of the phase-shift chip U1, and a cathode of the capacitor C2 is connected with the IN1 pin of the phase-shift chip U1 after passing by a resistor R1 while an anode of the capacitor C2 is connected with an IN2 pin of the phase-shift chip U1. Compared with the prior art, the phase-shift processing based LED driving system has the advantages that by the aid of the phase-shift circuit, voltage of the driving system can be more stable, and influences of LED lamp flickering on light effects are avoided.

Description

technical field [0001] The present invention relates to an LED driving system, in particular to a phase-shifting LED driving system based on a capacitive feedback three-point oscillating circuit Background technique [0002] High-power LEDs are increasingly being used in traffic lights, illuminated signage, street lights, airport runways, railway crossings, medical / surgical lighting and traffic signals. They have a long lifetime (high-power white LEDs typically have a lifetime of 35,000 to 50,000 hours) and low power consumption. However, due to the unstable performance of the drive system during the use of LEDs, the LED lights will flicker and affect the lighting effect. Contents of the invention [0003] The purpose of the present invention is to solve the defect of unstable performance of the LED driving system, and provide a phase-shifting LED driving system based on a capacitive feedback three-point oscillating circuit. [0004] The purpose of the present invention ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect that the performance of the LED drive system is unstable, and to provide a phase-shifting LED drive system based on a capacitive feedback three-point oscillating circuit

Images