Piecewise linear LED driving circuit and method

A technology of LED driving and segmental linearity, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of high power factor and flicker-free two performances, and solve the problem of power frequency flicker, structure Simple, easy-to-achieve effects

Active Publication Date: 2017-01-18
CRM ICBG (WUXI) CO LTD
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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a segmented linear LED drive circuit an

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  • Piecewise linear LED driving circuit and method
  • Piecewise linear LED driving circuit and method
  • Piecewise linear LED driving circuit and method

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[0054] The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0055] see Figure 3 to Figure 8 . It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will i...

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Abstract

The invention provides a piecewise linear LED driving circuit and a piecewise linear LED driving method. The piecewise linear LED driving circuit comprises a voltage input module which provides an input voltage, an LED lamp string, a driving voltage adjusting module which adjusts a driving voltage according to potential between both ends of an LED lamp section, a plurality of control tubes, a control module which controls on and off of each control tube through detecting an output current, and a sampling resistor. By changing the structure of a linear LED driving circuit, the piecewise linear LED driving circuit and the piecewise linear LED driving method realize high power factor and constant power output simultaneously, ensure the luminous flux output to be constant, eliminate power frequency flicker from the total light yield aspect, and improve the efficiency.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a segmented linear LED driving circuit and method. Background technique [0002] LED is a semiconductor electronic component that can emit light. In the early days, this electronic component could only emit red light with low luminosity. With the continuous advancement of technology, it has now developed to the extent that it can emit visible light, infrared light and ultraviolet light, and the luminosity has also increased. big improvement. LED has the advantages of high efficiency, long life, not easy to break, high switching speed, high reliability and other advantages over traditional light sources, and has been widely used in indicator lights, displays and lighting fields. [0003] In order to obtain a high power factor (PF) in the linear LED drive, a segmented drive scheme is usually used, such as figure 1 Shown is a common segmented linear LED driving circuit 1, ...

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Application Information

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IPC IPC(8): H05B37/02
Inventor 俞秀峰尤勇李国成任会远祝超刘军吴泉清
Owner CRM ICBG (WUXI) CO LTD
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