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led drive circuit

A technology of LED drive and drive current, applied in the field of lighting, can solve problems such as light decay that cannot be solved

Inactive Publication Date: 2016-04-27
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the heat dissipation of the structure is better, the environment is better (no corrosive gas), the above solutions can not solve the problem of light decay

Method used

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Embodiment Construction

[0031] 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 creative efforts fall within the protection scope of the present invention.

[0032] see figure 1 , the LED drive circuit provided by Embodiment 1 of the present invention includes:

[0033] A power supply unit 11, configured to output a stable voltage;

[0034] Microcontroller unit 12, for setting a delay time and carrying out delay control; Microcontroller unit 12 can be made up of single-chip microcomputer;

[0035] Relay 13, used for current switching;

[0036] A switch circuit 14, connected between the micro-controller unit 12 and th...

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PUM

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Abstract

The invention provides an LED driver circuit which includes a power supplying unit; a microcontroller unit used for setting a delay time and carrying out delay control; a relay; a switching circuit connected between the microcontroller unit and the relay and used for controlling the on-off of the relay according to output signals of a microcontrol unit; a voltage division circuit which outputs first and second voltage division voltages under on-off states of the relay; an LED drive chip circuit which outputs a first drive current when the voltage division circuit outputs the first voltage division voltage and outputs a second drive current when the voltage division circuit outputs the second voltage division voltage, wherein the second drive current is larger than the first drive current, within a delay time set by the microcontroller unit, the voltage division circuit outputs the first voltage division voltage and after the set delay time is out, the voltage division circuit outputs the second voltage division voltage; and an LED load which is connected with the LED drive chip circuit. The LED drive circuit is capable of solving an LED luminance decrease problem.

Description

technical field [0001] The invention relates to the lighting field, in particular to an LED driving circuit. Background technique [0002] LED (LightEmittingDiode) lighting is light-emitting diode lighting, which is a semiconductor solid-state light-emitting device. It uses a solid semiconductor chip as a light-emitting material. In the semiconductor, excess energy is released through the recombination of carriers to cause photon emission, which directly emits red, green, blue or white light. LED lighting products are lighting appliances manufactured using LEDs as light sources. [0003] However, on the one hand, the existing LED drive circuit can accept a narrow input voltage range. When the input voltage fluctuates in a wide range, it is easy to cause damage to the LED, its power supply and the drive circuit; on the other hand, its load regulation rate is relatively low. Poor, when the load changes greatly, it will cause the current instability. After one to two years o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 周明杰徐亮亮
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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