High power factor flicker-free device, led lamp and method

Abstract

The invention discloses a high-power-factor non-strobe device used for an LED lamp set. The forward output end of the high-power-factor non-strobe device is connected with the positive electrode of the LED lamp set. The backward output end of the high-power-factor non-strobe device is connected with the negative electrode of the LED lamp set. The high-power-factor non-strobe device comprises a control unit, a constant-current unit, a voltage detecting unit and a PFC unit, wherein the voltage detecting unit collects a constant-current unit working voltage signal of the working voltage of the constant-current unit, the control unit controls the PFC unit to conduct high-power-factor output according to the constant-current unit working voltage signal and a first voltage signal of the PFC unit, and the control unit controls the constant-current unit to provide the constant current for the LED lamp set according to a current detection signal of the constant-current unit. By means of the high-power-factor non-strobe device, an LED lamp and a method, high-power-factor output can be achieved, the constant current can be provided for the LED lamp set, and therefore the strobe phenomenon of the LED lamp set is eliminated.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to a high power factor flicker-free device, an LED lamp and a method. Background technique [0002] The PF value is the power factor, which refers to the cosine value of the phase difference between the input voltage and the input current. A low PF value will increase the loss of the power grid. Efficiency is the ratio of the output power to the input power of the power supply. Low efficiency will increase the loss of the power supply. Although the wattage of a single power supply of LED lamps is not large, the quantity is huge. About 20% of the total global power generation is used for lighting every year. If the lighting power supply does not consider the PF value, it will also cause huge energy loss. In many countries' regulations on lighting drive power, the requirements for PF value are becoming more and more stringent. For LED lighting drivers with PFC function, generally the outp...

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Problems solved by technology

[0004] 1) Increasing the output electrolytic capacitor, this approach cannot completely solve this problem, unless the electrolytic capacitor is increased regardless of cost

[0005] 2) A valley-filling passive PFC scheme is added to the input end of the driving power supply. The problem with the valley-filling PFC scheme is that the output no-load voltage is not controlled, and it is easy to burn the lamp beads

[0007] The performance of some of the above solutions cannot be controlled, and some circuits are very complex and costly, and the volume of the driving power supply cannot be reduced due to the large number of components.

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