Ripple refection circuit and power supply system and ripple refection method thereof

Abstract

A ripple refection circuit comprises a filter circuit and a follower circuit, wherein the filter circuit comprises an input end and an output end, the input end of the filter circuit is in coupling with a voltage source, the filter circuit enables voltage of the voltage source to be filtered and enables the filter voltage to be output at the output end of the filter circuit, and the voltage contains ripple. The follower circuit comprises a first input end, a second input end and an output end, wherein the first input end of the follower circuit is in coupling with the voltage source, the second input end of the follower circuit is in coupling with the output end of the filter circuit, the output end of the follower circuit provides output signals to be used for providing energy for load, and the output signals are produced according to the filter voltage. The ripple refection circuit has the advantages of being long in service life, reducing capacity values, being convenient and flexible to control, strong in adaptability and the like.

Description

technical field [0001] The present invention relates to a power supply system, in particular but not limited to an output current ripple suppression circuit and method for a light emitting diode power supply system. Background technique [0002] Light-emitting diodes (LEDs), as low-energy, high-efficiency light-emitting materials, are widely used in lighting. In an existing LED power supply system, a single-stage power factor correction (PFC) voltage conversion circuit is used to drive the LED and supply energy to the LED. However, the DC signal output by the single-stage PFC voltage conversion circuit contains relatively large ripples. In order to reduce the ripple, an existing solution is to couple an electrolytic capacitor with a large capacitance to the output terminal. However, the life of the electrolytic capacitor is short, much shorter than that of the LED, and the use of an electrolytic large capacitor will reduce the life of the entire power supply system. At th...

AI Technical Summary

Problems solved by technology

However, the life of electrolytic capacitors is short, much shorter than that of LEDs, and the use of large electrolytic capacitors will reduce the life of the entire power supply system

At the same time, large capacitors also increase the size of the system

Images