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Control method for avoiding flicker effect and illumination device

A control method and technology of a light-emitting device, which are applied to lighting devices, light sources, electric light sources, etc., can solve the problems of insufficient voltage in the head space of the current source, long feedback tracking time, and inability to provide sufficient driving current.

Active Publication Date: 2011-04-06
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the aforementioned prior art, if only through the fixed preset reference voltage V REF comparison to adjust the drive voltage V D , may not be able to real-time drive voltage V due to lengthy feedback tracking time D Raising to an appropriate level, during the period of feedback tracking, the current source 106 will not be able to provide enough driving current due to insufficient voltage in the head space, and the light emitting diode will therefore flicker

Method used

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  • Control method for avoiding flicker effect and illumination device
  • Control method for avoiding flicker effect and illumination device
  • Control method for avoiding flicker effect and illumination device

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Embodiment Construction

[0055] Please refer to figure 2 , figure 2 It is a schematic diagram of a light emitting device 20 according to Embodiment 1 of the present invention. The lighting device 20 includes a voltage converter 202 , a lighting source module 204 , a variable current source 206 and a control unit 208 . Among them, the light emitting device 20 can be applied to any kind of light source. The voltage converter 202 is used to control the signal S according to a voltage C , an input voltage V IN converted to an output voltage V D , so as to provide to the light source module 204 . The light emitting source module 204 is coupled to the voltage converter 204 . It should be noted that, in this embodiment, the light emitting source module 204 includes a group C of light emitting diodes 1 ~C m , but not limited thereto, there may be only one LED group. On the other hand, since the LED is a current-driven component, its luminous brightness is directly proportional to the magnitude of t...

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Abstract

The invention discloses a control method for avoiding a flicker effect and an illumination device. The control method for avoiding the flicker effect is applied to an illumination light source module and comprises the following steps of: detecting the change condition of a drive current in the illumination light source module to generate a current detection signal; regulating a variable reference voltage according to the current detection signal; acquiring a feedback voltage from the illumination light source module; generating a voltage control signal according to the feedback voltage and the variable reference voltage; and generating an output voltage according to the voltage control signal to drive the illumination light source module.

Description

technical field [0001] The invention relates to a control method and a light emitting device, in particular to a control method and a light emitting device capable of dynamically detecting load current to avoid the flicker effect. Background technique [0002] With the advent of the energy crisis and the rising awareness of environmental protection, the demand for energy conservation and environmental protection has become a topic of widespread concern around the world. Compared with traditional light sources, light emitting diodes (Light Emitting Diode, LED) have the advantages of power saving, long component life, no mercury, rich color gamut, no warm-up time, and fast response. Therefore, light emitting diodes have been It is widely used as a light source for display and lighting. In addition, light-emitting diodes can be made into extremely small or arrayed components due to their small size, light weight, impact resistance, suitability for mass production, and easy ada...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 徐国庆张淙豪许庆勋
Owner NOVATEK MICROELECTRONICS CORP