LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same

A technology of constant current drive and circuit, applied in the direction of lamp circuit layout, electric light source, electric light source, etc., can solve the problems of fixed output current, unable to set output current by external devices, and unable to perform PWM stepless dimming control, etc., to meet the requirements of Effect of Dimming Demand

Inactive Publication Date: 2012-07-25
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • 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

Method used

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  • LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same
  • LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same
  • LED (Light Emitting Diode) constant-current drive 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 (LED400), the PWM unit 500 is electrically connected to the constant current unit 300, and the PWM unit 500 changes the output through the The PWM pulse duty cycle controls the constant current unit 300, thereby realizing the stepless dimming of the LED 400 and meeting people's demands for d...

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PUM

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Abstract

The invention belongs to the field of LED (Light Emitting Diode) drive circuits and discloses an LED constant-current drive circuit and an LED lamp using the same. The LED constant-current drive 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 supplies a constant current to an LED, the PWM unit is electrically connected with the constant-current unit, and the PWM unit controls the constant-current unit through outputting a variable PWM pulse duty factor. The design of the circuit is simple and reliable, and the stepless dimming of the LED can be realized through only changing the variable PWM pulse duty factor output by the PWM unit, so that the circuit has the advantages of simplicity, convenience, stability and reliability.

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 drive 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, sma...

Claims

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Application Information

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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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