Dimmable LED constant-current drive circuit

A constant current drive, dimming control circuit technology, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problems of grid pollution and anti-electromagnetic interference performance, achieve excellent power utilization, improve utilization, and reduce operating costs Effect

Active Publication Date: 2009-11-04
广州冠今投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention aims at the problems of self-regulation and closure of the dimmable LED drive circuit in the prior art, pollution to the power grid, and poor anti-electromagnetic interference perfor

Method used

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  • Dimmable LED constant-current drive circuit
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  • Dimmable LED constant-current drive circuit

Examples

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Embodiment Construction

[0031] Such as figure 1 It is a dimmable constant current source circuit, including an EMC protection circuit 1, a PFC correction circuit 2; a constant current source circuit 3, 4, a dimming control circuit 5; a dimming control power supply circuit 6; the EMC protection circuit 1 The input end is connected to the external AC220V input, the output end is connected to the PFC correction circuit 2, the 400V constant voltage signal output by the PFC correction circuit 2 is output to the constant current source circuit 3, 4, and the dimming power supply circuit 6, the constant The output terminals of the current sources 3 and 4 drive external lamps, and the output terminals of the dimming control circuit 5 output PWM signals to drive the constant current sources 3 and 4 to achieve the purpose of dimming. The dimming control power supply circuit 6 outputs a constant voltage signal to provide the dimming control 5 . The alarm monitoring circuit 7 extracts alarm signals from the cons...

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PUM

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Abstract

The invention relates to a dimmable constant-current drive circuit, belongs to the technical field of current drive circuits, and in particular relates to improvement on a dimmable LED constant-current drive circuit, which comprises a lighting protection and electromagnetic compatible circuit (1), a power factor correction circuit (2), a plurality of constant current power circuits (3,4), a dimmable control power supply circuit (6), a dimmable control circuit (5) with a serial interface, and an alarm detection circuit (7), wherein the alarm detection circuit (7) extracts an alarm signal from the constant current power circuits (3,4), and outputs the signal to the dimmable control circuit (5) after identification processing. The dimmable LED constant-current drive circuit can resist external electromagnetic interference and provide dynamic compensation, and has superior electric energy utilization rate even when load changes dynamically, thereby improving electricity-saving effect, performing programming control or network monitoring on illuminating devices and realizing various required illumination effects.

Description

Technical field [0001] The invention relates to a dimmable constant current drive circuit, which belongs to the technical field of current drive circuits, in particular to the improvement of a dimmable LED constant current drive circuit. Used to supply power to drive and regulate loads composed of light-emitting diodes (LEDs). Including electromagnetic compatibility circuit, power factor correction circuit, several constant current power supply circuits, dimming control power supply circuit, dimming control circuit. Background technique [0002] Since the birth of the first light-emitting diode in the 1960s, for a long period of time, due to the limitation of output lumens, LEDs were only used for signal indication purposes. By the 1990s, blue LEDs were commercialized due to a more economical implementation method. In the 21st century, high-power white LEDs have been successfully developed and rapidly industrialized. During this period, due to the intervention of large-sc...

Claims

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Application Information

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IPC IPC(8): H05B37/00H05B37/02
Inventor 丁玺
Owner 广州冠今投资有限公司
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