LED driving power supply and working method thereof, and LED lamp

Abstract

The invention discloses an LED driving power supply, comprising a first stage conversion circuit and M parallel second stage conversion circuits. Wherein, the primary side of the first stage conversion circuit is connected with the mains power, and the secondary side is respectively connected with M second stage conversion circuits to convert the mains high-voltage alternating current into low-voltage alternating current; Each second stage conversion circuit comprises a switching impedance characteristic conversion circuit and a constant current control circuit, wherein the capacitive characteristic of the later stage LED load is converted into a resistive characteristic, the constant current control function is simultaneously completed, and the input low-voltage AC signal is converted into a low-voltage constant-current DC voltage of 24-120V, and the output voltage is output to the LED load. The second stage conversion circuit comprises a switching impedance characteristic conversioncircuit and a constant current control circuit. The invention adopts a brand new topological structure, that is, a topological structure combining low-frequency power conversion, active impedance characteristic conversion and intelligent digital power technology, can solve the defects of poor anti-surge capability, easy interference to a power network, poor reliability, short service life, low working environment temperature and the like of a current LED driving power supply.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to an LED driving power supply and its working method, an LED lamp, and also to other power supply fields, such as the field of chargers. Background technique [0002] With the maturity of LED technology, lighting products using LEDs as light sources have gradually replaced fluorescent lamps, gas discharge lamps, tungsten filament lamps and other light sources. LED lighting products generally need to use a power supply (also known as a driving power supply) to convert AC mains power into DC and provide various control functions. [0003] The current LED drive power supply has the following three situations: [0004] 1. Most of them use switching power supply conversion to achieve constant current or constant voltage functions. This kind of power supply has large input surge current at startup, large harmonic distortion of input current, and high-order harmonics. At the same time, There...

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide LED drive power supply, which adopts a brand-new topology structure, that is, a combination topology structure of low-frequency power supply conversion, active impedance characteristic conversion and intelligent digital power supply technology , can solve the defects of the current LED drive power supply, such as poor anti-surge ability, easy to interfere with the power grid, poor reliability, short life, and low working environment temperature

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