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Led driving device and method thereof

A technology of light emitting diodes and driving devices, applied in the field of electric light source circuit devices, can solve the problems of pulse width modulation signal noise interference, inaccurate dimming effect, reduced practicability, etc., and achieve the effect of avoiding stroboscopic or noise interference

Inactive Publication Date: 2013-06-05
UNITY OPTO TECH CO LTD
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  • Claims
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Problems solved by technology

Therefore, the aforementioned dimming method will cause inaccurate dimming effect due to the inconsistency between the change of the driving voltage and the driving current.
Moreover, when the voltage frequency is too low, such as 100 Hz (Hertz, Hz) or 120 Hz, the bidirectional triode thyristor is likely to cause the light-emitting diodes to flicker, which causes visual discomfort to the user.
Conversely, when the voltage frequency is too high, the high and low level voltage of the pulse width modulation signal changes too fast to form noise interference, causing the light-emitting diode to work abnormally and reducing the practicability

Method used

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  • Led driving device and method thereof
  • Led driving device and method thereof

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Embodiment Construction

[0021] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0022] see figure 1 , is a flowchart of a preferred embodiment of the present invention. As shown in the figure, the light-emitting diode driving method is a method for driving and linearly adjusting the illumination brightness of at least one light-emitting diode by a light-emitting diode driving device. The light-emitting diode driving device may include a control circuit, a holding current circuit, an integrating circuit, a control circuit, a filter circuit and a drive circuit, and it includes the following steps:

[0023] In step S1, a bidirectional triode thyristor of the control circuit is used to receive an AC voltage from a power supply, and after adjusting the phase conduction angle of the AC voltage, a bridge full-wave rectifier of the control circuit is passed rectifying and outputting a regul...

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Abstract

An LED driving device and its method are suitable for driving and regulating an illumination brightness of at least one LED. After switching the phase angle of an alternating voltage through a regulation circuit, an integration circuit and a filter circuit are utilized to generate a stable constant voltage. Next, the magnitude of the constant voltage is regulated in stage through a driving circuit based upon a control signal of a control circuit, and the voltage is converted into a constant current for driving the LED. Accordingly, the invention utilizes the constant current with stage variation to achieve the effect of linear dimming to prevent flickering.

Description

technical field [0001] The present invention belongs to the technical field of electric light source circuit devices, and in particular relates to a light-emitting diode driver that utilizes a bidirectional triode AC switch (TRIAC) and a control circuit to adjust a constant DC drive current to linearly adjust the brightness of the light-emitting diode. Apparatus and method thereof. Background technique [0002] At present, in order to meet the changing needs of lighting light in places such as stages, movie theaters or conference rooms, or to meet the environmental protection trend of energy saving and power saving, a large number of dimming devices have been used in various lighting equipment or systems to achieve automatic or multi-level adjustment. The effect of the amount of light distribution on the lighting. For example, a general light-emitting diode (Light-Emitting Diode, LED) lamp uses a bidirectional triode thyristor to switch the conduction angle of the input vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B33/0815H05B37/02H05B45/3725H05B45/375
Inventor 张暐邱绍伟
Owner UNITY OPTO TECH CO LTD
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