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LED (light emitting diode) constant current driving circuit and LED lamp using same

A technology of constant current drive and circuit, which is applied in the direction of lamp circuit layout, electric light source, electric light source, etc., and can solve the problems that the output current cannot be set by external devices, PWM stepless dimming control cannot be performed, and users are inconvenient.

Inactive Publication Date: 2014-11-26
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, people are accustomed to using constant current chip technology to drive LEDs. It has the advantages of low power consumption, high efficiency, small volume per unit power, and light weight. However, its output current is fixed, and the output current cannot be set by external devices, nor can PWM level dimming control, which brings serious inconvenience to users

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  • LED (light emitting diode) constant current driving circuit and LED lamp using same
  • LED (light emitting diode) constant current driving circuit and LED lamp using same

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Embodiment Construction

[0018] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The present invention provides an LED constant current drive circuit, such as figure 1 As shown, the LED constant current drive circuit includes a power supply 100 (the present invention uses a 3.7V DC power supply, such as a primary battery or a rechargeable battery), a filter unit 200 , a constant current unit 300 , and a PWM unit 500 . The filter unit 200 is electrically connected between the positive pole of the power supply 100 and the constant current unit 300, the constant current unit 300 provides a constant current for the load (ie LED400), the PWM unit 500 is electrically connected with the filter unit 200 and the load 400, the PWM unit 500 The constant current unit 300 is controlled by outputting a variable PWM pulse duty ratio, thereby realizing stepless dimming of the LED 400 and meeting people's demands for di...

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PUM

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Abstract

The invention belongs to the field of LED (light emitting diode) driving circuits and discloses an LED constant current driving circuit and an LED lamp using the circuit. The LED constant current driving circuit comprises a power supply, a filtering unit, a constant current unit and a PWM (pulse-width modulation) unit, wherein the filtering unit is electrically connected between the power supply and the constant current unit, the constant current unit provides a constant current for an LED, the PWM unit is electrically connected with the filtering unit and a load respectively, and the PWM unit controls the constant current unit by the output of a variable PWM pulse duty factor. According to the circuit, the design is simple and reliable, the stepless dimming of the LED can be realized by only changing the variable PWM pulse duty factor output by the PWM unit, so that the circuit is simple, convenient, stable and reliable.

Description

technical field [0001] The invention belongs to LED drive circuits, in particular to an LED constant current drive circuit with DC wide voltage input and constant current output. The invention also relates to an LED lamp using the LED constant current driving circuit. Background technique [0002] As a new type of light source, LED has the characteristics of energy saving, environmental protection, and high efficiency. The technology has matured and is applied in various fields. LED is widely used as a lighting source, and various LED drive circuits have also appeared. As a constant current load, LED itself has strict requirements on the working voltage, too high or too low voltage will cause the LED to work abnormally, so the power supply quality of the power supply voltage directly affects the reliability of the LED. At present, people are accustomed to using constant current chip technology to drive LEDs. It has the advantages of low power consumption, high efficiency, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02F21S2/00F21Y101/02F21K9/00F21Y115/10
Inventor 周明杰孙占民
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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