Light-emitting diode brightening drive device
A technology for light-emitting diodes and driving devices, which is applied to lighting devices, components of lighting devices, semiconductor devices of light-emitting elements, etc., can solve problems such as electromagnetic interference and noise, and achieve the effect of improving brightness and reducing electromagnetic interference.
Inactive Publication Date: 2012-10-03
ULTRA CHIP INC
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Problems solved by technology
[0004] Using pulse width modulation technology as the control method of LED brightness, its shortcomings are prone to electromagnetic interference, and sometimes even noise that can be heard by the human ear
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[0036] Relevant technical content and detailed description of the present invention, cooperate accompanying drawing to illustrate as follows:
[0037] See figure 1 , a block diagram of a preferred embodiment of the light emitting diode brightness enhancement driving device of the present invention. As shown in the figure, the light emitting diode brightening driving device 100 includes a light emitting diode array 10, a transistor switch 20, a feedback resistor 30, a first overcurrent comparator 40, a second overcurrent comparator 42 and an increasing Light up the control module 50. An anode terminal of the LED array 10 is connected to an external power supply Vin. A source terminal of the transistor switch 20 is electrically connected to a cathode terminal of the LED array 10 . One end of the feedback resistor 30 is electrically grounded, and the other end is electrically connected to the drain terminal of the transistor switch 20, and the drain terminal of the transistor ...
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The invention discloses a light-emitting diode brightening drive device used for supplying an external power source to a light-emitting diode array and providing a brightening control module to drive the light-emitting diode array. The brightening control module comprises a waveform generator, a counter, a pulse interleaved controller, a pulse width modulation controller and a constant-current controller; the counter is used for counting the output of the waveform generator to provide three count values so as to respectively generate a first cycle time and a second cycle time; the pulse interleaved controller outputs an offset cycle time according to the third count value; the pulse width modulation controller outputs a high pulse signal in the first cycle time and outputs a low pulse signal in the second cycle time; and the constant-current controller maintains the output current of the light-emitting diode brightening drive device to be a constant value. The offset cycle time is added when a brightening effect is periodically converted to stagger the simultaneously appeared frequency of the high pulse signal, so the light-emitting diode brightening drive device achieves the effects of brightening, stabilizing voltage and decreasing electromagnetic interference.
Description
technical field [0001] The invention relates to a light emitting diode driving device, in particular to a light emitting diode brightness enhancement driving device. Background technique [0002] Light emitting diodes (light emitting diodes, LEDs) have become unshakable in the backlight of today's portable products. In the field of lighting, LED, as the most critical component of semiconductor lighting, has many advantages, such as energy saving, environmental protection, long life, maintenance-free...etc. The LED drive circuit is an important part of LED products. No matter in the field of lighting, backlight or display panel, the choice of drive circuit technology architecture should match the specific application. [0003] Using pulse width modulation technology (Pulse Width Modulation, PWM) as the control method of LED brightness (also known as gray-scale dimming), using simple digital pulses to repeatedly switch the LED driver, the system only needs to provide differen...
Claims
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IPC IPC(8): F21V23/00H05B37/00H05B37/02F21Y101/02F21Y115/10
CPCY02B20/42Y02B20/40
Inventor 吴泰峰
Owner ULTRA CHIP INC