Automatic dimming LED constant-current driving circuit

A technology of constant current drive and automatic dimming, which is applied in the direction of lamp circuit layout, light source, electric light source, etc., which can solve the problems of user inconvenience, inability to adjust output power, and inability to adjust light intensity

Active Publication Date: 2015-07-08
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, integrated integrated high-frequency modules are used to design LED drivers in DC low-voltage places, but these driving methods are all constant power output, and the output power cannot be adjusted, and the light intensity cannot be adjusted, which brings great inconvenience to users. serious inconvenience

Method used

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  • Automatic dimming LED constant-current driving circuit
  • Automatic dimming LED constant-current driving circuit

Examples

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Embodiment Construction

[0021] Such as figure 1 Shown is a block diagram of an automatic dimming LED constant current drive circuit.

[0022] An automatic dimming LED constant current drive circuit includes a dimming module 102 , a voltage divider module 101 , a photosensitive module 104 and a constant current drive module 103 .

[0023] The power supply terminal of the dimming module 102 is connected to the output terminal of the voltage divider module 101, the output terminal is connected to the enable terminal of the constant current drive module 103, and the input terminal of the voltage divider module 101 is connected to the input power supply; The power supply terminal of the constant current drive module 103 is connected to the input power supply, the ground terminal is connected to the ground, and the output terminal is connected to the positive pole of the series LED lamp group, the negative pole of the series LED lamp group is connected to the feedback terminal of the constant current drive...

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Abstract

Provided is an automatic dimming LED constant-current driving circuit. Working voltage is provided for a dimming module by a voltage dividing module to enable the diming module to output a pulse modulation and demodulation signal to a constant-current driving module so as to change the magnitude of current output by the constant-current driving module. Further, the input current of a series LED lamp group connected with the output end of the constant-current driving module can be controlled, and the lighting brightness of the series LED lamp group can be changed. Meanwhile, a light sensing module is used for sensing the brightness of the series LED lamp group, and making the dimming module change the duty ratio of the pulse modulation and demodulation signal when the brightness of the series LED lamp group is lower or higher than the nominal light intensity, so as to change the output current of the constant-current driving module and make the brightness of the series LED lamp group at the nominal light intensity.

Description

technical field [0001] The invention relates to an LED constant current drive circuit, in particular to a simple and easy-to-operate automatic dimming LED constant current drive circuit. Background technique [0002] LEDs are widely used as light sources, and various LED drive circuits have emerged accordingly. Since the LED itself has strict requirements on the working voltage, the working current of the LED will fluctuate greatly if the voltage is too high or too low, so the constant current and voltage limiting driving method is generally used for the LED. Therefore, when the LED is used as a current-type work load, the current flowing through the LED must be guaranteed to be within the rated current. At present, integrated integrated high-frequency modules are used to design LED drivers in DC low-voltage places, but these driving methods are all constant power output, and the output power cannot be adjusted, and the light intensity cannot be adjusted, which brings great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 周明杰刘百顺
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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