LED driving circuit with improved flicker performance and LED lighting device including same
An LED driving and LED lighting technology, applied in lighting devices, lighting and heating equipment, electric light sources, etc., can solve the problems of unstable light output of LED lighting devices, inability to correctly reflect current/voltage characteristics, and shortening the life of lighting equipment.
Active Publication Date: 2019-02-15
SEOUL SEMICONDUCTOR
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Problems solved by technology
In the case of using a DC drive method, an AC-DC converter such as SMPS must be required, and this power converter has the following problems: increasing the manufacturing unit price of lighting equipment; making it difficult to miniaturize lighting equipment; reducing Energy Efficiency of Lighting Fixtures; Shorter Lifetimes Lead to Shorter Life of Lighting Fixtures
However, the above-mentioned voltage detection method has a problem that it cannot accurately reflect the current / voltage characteristics according to temperature.
That is, the forward voltage of the LED group differs from each other according to the "operating temperature of the LED". However, the voltage detection method cannot accurately reflect the I / V characteristic according to the temperature of the LED described above, so that the LED drive may occur. The current (LED light output) decreases or overshoots instantaneously at the time point when the operating range changes (for example, the time point when the first step operating range is changed to the second step operating range), so there is a phenomenon of LED lighting device Problems with unstable light output
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[0126] The detailed description of the invention that follows refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. These examples give detailed descriptions to enable those skilled in the art to practice the invention sufficiently. It is to be understood that although the various embodiments of the invention differ from one another, they are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein can be implemented as other embodiments according to one embodiment without departing from the technical idea and scope of the present invention. In addition, it should be understood that the positions or arrangements of individual components in the disclosed embodiments may be changed without departing from the technical spirit and scope of the present invention. Therefore, the following detailed description should not be considered in a restrictive sense, and if p...
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The invention discloses an LED drive circuit with improved flicker performance and an LED lighting device comprising the same. The disclosed LED lighting device with improved flicker performance, as an LED lighting device in an alternating sequential driving mode, uses a loopback compensation part to eliminate the illegal light interval of the LED lighting device, thereby reducing the flickering that occurs in the operating interval. Light output deviation of LED lighting fixtures.
Description
technical field [0001] The invention relates to an LED drive circuit with improved flicker performance and an LED lighting device comprising the same. More specifically, the present invention relates to an LED lighting device in an alternating sequential driving mode, which can reduce the flicker performance of the light output deviation of the LED lighting device that occurs in the working range by eliminating the LED extinguishing interval. An improved LED driving circuit and an LED lighting device including the same. Background technique [0002] The general LED driving method is a direct current driving method. In the case of using a DC drive method, an AC-DC converter such as SMPS must be required, and this power converter has the following problems: increasing the manufacturing unit price of lighting equipment; making it difficult to miniaturize lighting equipment; reducing Energy efficiency of lighting fixtures; shorter lifespan leads to shortened life of lighting f...
Claims
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B47/10F21S2/00
Inventor 郑暎都陈成昊韩相昱郑蕙万
Owner SEOUL SEMICONDUCTOR