LED sectional dimming circuit

A segmented dimming and LED driving technology, applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problem that the chip cannot select sampling information, and achieve the effect of simple structure, wide application range and cost reduction.

Active Publication Date: 2014-09-03
WUXI SI POWER MICRO ELECTRONICS
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Second, for the application scheme of the floating structure, the absolute voltage of the chip is constantly changing with the switching of the power tube, and it is impossible to select a reference value inside the chip to compare with the sampling information of the pin DIM to determine whether the system is powered off or powered on. ,and many more

Method used

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0029] In order to solve the problems existing in the prior art, the present invention proposes a segmental dimming circuit applied to LED drive circuits. The light circuit can be used in the architecture of various LED driving circuits, making the segmental dimming circuit more practical. The present invention is applied to an AC / DC switching power converter by way of example only, but it should be recognized that the present invention has a wider application range.

[0030] image 3 It is a schematic diagram of the LED driving circuit of the first embodiment of the present invention, and the circuit is an isolated type with PFC function. 301 is AC power supply; 302~305 are bridge rectifiers, 306 is a small filter capacitor (such as 100nF), and the line voltage after rectifying the bridge is a half-wave waveform; 309, 310 are chip startup circuits; 311 is LE...

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Abstract

The invention provides an LED sectional dimming circuit which comprises a dimming detection end, a power source generation circuit, an annular counter, a decoder and a selection circuit, wherein the dimming detection end is connected with an enable signal En in an LED driving chip and is used for detecting power failure and power on, caused by a dimming switch, of a system; the power source generation circuit is used for providing a power source for circuits in the LED sectional dimming circuit; the output end of the power source generation circuit is connected with the annular counter and the decoder; the input end of the annular counter is connected with the dimming detection end, and the annular counter is used for calculating the frequency of pressing the dimming switch; the input end of the decoder is connected with the annular counter, and the decoder is used for decoding an output signal of the annular counter to control the output of the selection circuit; the selection signal end of the selection circuit is connected with the decoder, the input end of the selection circuit is connected with reference voltage of each section, and the selection circuit is used for selecting the needed reference voltage as output. The LED sectional dimming circuit is wide in application range and can be applied to isolating, non-isolating and floating LED driving circuits and LED driving circuits with various frameworks of PFC (power factor correction) and the like.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to a section dimming circuit inside an LED driving chip in the LED driving circuit. Background technique [0002] LED lights have been widely used in the field of lighting, and have gradually become a new generation of lighting sources due to their unique advantages. People have also put forward requirements for the working mode of LED lights, and dimming is one of the important ones. Among all dimming technologies, segmental dimming is a relatively simple design, low cost, convenient and practical technology. [0003] figure 1 It is the schematic diagram of the existing segmental dimming technology applied to the LED drive circuit, 101 is the AC power supply, 102, 103, 104, 105 are bridge rectifier circuits, 106 is a large filter capacitor (the common value is several uF), Together with the rectifier circuit, the AC signal is rectified and filtered, and the line voltage is output; 107 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 涂才根黄飞明赵文遐丁国华励晔朱勤为
Owner WUXI SI POWER MICRO ELECTRONICS
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