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Light emitting diode (LED) driving circuit and control method of LED

一种LED驱动、驱动电路的技术，应用在电灯电路布置、电光源、电气元件等方向，能够解决输出电压剧烈抖动、大输出纹波、纹波等问题，达到避免剧烈抖动、避免纹波的效果

Active Publication Date: 2015-04-22
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In the whole time, the output current of the LED driver circuit in the above-mentioned dimming mode will show two current values. When the current value changes, the load current will change greatly, which will cause severe jitter of the output voltage, resulting in relatively high voltage. large output ripple, which causes a large ripple in the load current

Method used

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  • Light emitting diode (LED) driving circuit and control method of LED
  • Light emitting diode (LED) driving circuit and control method of LED
  • Light emitting diode (LED) driving circuit and control method of LED

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Embodiment Construction

[0072] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0073] The embodiment of the present invention discloses an LED drive circuit, such as figure 1 shown, including:

[0074] A reference voltage source module 1, the reference voltage source module 1 receives an external enable signal EN and an external power supply Vin, and generates a reference voltage Vref and an internal stable power supply voltage Vcc;

[0075] A voltage conversion module 2, the voltage conversion module 2 is connected to the reference vol...

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Abstract

A method for controlling a current flowing through one or more light emitting diodes (LEDs) comprising receiving a Pulse Width Modulation (PWM) control signal, which includes rising and falling edges; receiving a first voltage signal; generating a second voltage signal based on the PWM control signal and the first voltage signal, wherein the second voltage increases gradually in response to one of the rising and falling edges of the PWM signal and decreases gradually in response to the other of the rising and falling edges of the PWM signal; and providing a current to the one or more LEDs, wherein the current varies gradually according to the second voltage.

Description

technical field [0001] The invention relates to the technical field of LED lighting, and more specifically, to an LED driving circuit and an LED control method. Background technique [0002] With the development of modern society, the application of electronic products is changing with each passing day, and the market is growing rapidly. Mobile phones, PDA (Personal Digital Assistant, handheld computer), e-books, digital cameras, MP3, GPS (Global Positioning System, global positioning system), digital photo frame As the market hotspots in recent years, electronic products have more and more deeply affected people's daily life. The development of these electronic products has also driven and stimulated the development of related products. As LCD (Liquid Crystal Display, liquid crystal display device ) backlight WLED (White Light Emitting Diode, white light-emitting diode) and LED drive circuit demand is also increasing, and many companies at home and abroad have also develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCH05B33/0845H05B45/10
Inventor 孙建波
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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