A low voltage led driver chip
A LED driving and low-voltage technology, which is applied in the direction of electric light sources, lamp circuit layout, lighting devices, etc., can solve the problems of not being able to light up, affecting the display or lighting function of each LED, and each LED not working normally, etc.
Inactive Publication Date: 2011-12-21
理工大高新技术研究院(高邮)有限公司
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Problems solved by technology
[0003] In the prior art, LED driver chips used in LED displays and LED lighting generally only have a driving function, and can be used to drive LEDs with constant current or constant voltage. Generally, each LED driver chip needs to reach a predetermined voltage before it can be driven normally. For each LED, make each LED normally start at a predetermined driving voltage and display normally. For example, when the driving voltage is low, because the driving voltage of each LED cannot be reached, or, among the LEDs in series, the LED behind the series In LED, due to the loss of the circuit, the driving voltage of each LED cannot be reached, and it is easy to make each LED not work normally, or it cannot be lit, which affects the display or lighting function of each LED.
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0019] Such as figure 1 As shown, this embodiment provides a low-voltage LED driver chip. When the input video control signal is a low-voltage input, the LED driver chip can detect in time and adjust the voltage according to the detection result, so that the video control signal The output voltage of the LED is not lower than the minimum lighting voltage of each LED connected to it, ensuring that each LED can work normally at least at the lowest lighting voltage, thereby greatly reducing the working energy consumption in the low brightness state.
[0020] The LED driver chip is provided with an input voltage detection module, a voltage adjustment value generation module, a voltage adjustment module, and a boost drive module connected to each other, and the input voltage detection module, the voltage adjustment value generation module, the vol...
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The invention discloses a low-voltage LED driver chip, which includes an input voltage detection module for inputting a video control signal and the resolution of an external LED display screen and detecting the input voltage of the video control signal; according to a preset voltage value, Described input voltage and the resolution of described LED display screen, generate the voltage adjustment value generating module of the LED display screen voltage adjustment value table that includes voltage adjustment value; According to described LED display screen voltage adjustment value table, set the adjusted voltage A voltage adjustment module for the video control signal; and a boost drive module for increasing the output voltage to drive each LED of the LED display screen according to the adjusted video control signal. The invention can still ensure the normal operation of each LED at the lowest lighting voltage when the low voltage is input.
Description
technical field [0001] The invention relates to a driving technology of an illuminating device, in particular to a low-voltage LED driving chip. Background technique [0002] At the present stage, under the circumstances of global pursuit of health, environmental protection pressure, and energy crisis, semiconductor lighting has been recognized by the world as an important way of health, energy saving and environmental protection, and its application scope is expanding at a faster speed. [0003] In the prior art, LED driver chips used in LED displays and LED lighting generally only have a driving function, and can be used to drive LEDs with constant current or constant voltage. Generally, each LED driver chip needs to reach a predetermined voltage before it can be driven normally. For each LED, make each LED normally start at a predetermined driving voltage and display normally. For example, when the driving voltage is low, because the driving voltage of each LED cannot be ...
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IPC IPC(8): H05B37/02
Inventor 商松
Owner 理工大高新技术研究院(高邮)有限公司