Power factor correction circuit for large-power LED

Abstract

A power factor correction circuit for a large-power LED comprises the components of a correction unit; a current detecting unit; a voltage loop control unit; a current loop control unit; a resistor; an integration resetting circuit; and a comparator. The power factor correction circuit realizes comparison between regulating voltage which is output from the voltage loop control unit with a current signal that flows over the resistor through the integration resetting circuit. The switching signal of a switch module is obtained through a comparator. The power factor correction circuit has advantages of realizing a fact that input current follows waveform of the input voltage without input voltage detection, realizing no requirement for arranging an input voltage detecting circuit on a correcting main circuit, simplifying hardware structure of a main circuit, settling a problem of large occupation area by the main circuit of a power factor correction circuit in prior art, reducing circuit area of the main circuit, and reducing investment cost.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a power factor correction circuit for high-power LEDs. Background technique [0002] With the rapid development of the lighting industry, the requirements for lighting safety performance are getting higher and higher, and lighting appliances are national compulsory safety certification products. [0003] According to the current status of the lighting industry, if enterprises want to find new profit growth points, they must establish their own technology research and development institutions, enhance independent innovation capabilities, and strive to develop new technologies and new lighting products to enter the domestic and foreign medium and high-end markets. On the one hand, strengthen international cooperation. The world's lighting industry has a history of more than ten years, and has accumulated countless mature technologies and management experience. If we introduce and absorb fo...

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Problems solved by technology

[0005] Although my country's lighting technology and equipment development have made considerable progress, and the large-scale and localization of lighting equipment has gradually matured, there is still a certain gap between my country's overall lighting technology level and foreign countries.

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