Step-down light-emitting diode (LED) driving circuit

An LED driving and step-down technology, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems that PWM stepless dimming control cannot be performed, output current cannot be set by external devices, output current is fixed, etc., to achieve Overcome the unstable output current, simple and reliable circuit design, simple and convenient circuit

Inactive Publication Date: 2012-07-11
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
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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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  • Step-down light-emitting diode (LED) driving circuit
  • Step-down light-emitting diode (LED) driving circuit
  • Step-down light-emitting diode (LED) driving circuit

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Embodiment Construction

[0019] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] The invention provides a step-down LED drive circuit with DC wide voltage input and constant current output. figure 1 and 2 As shown, the step-down LED drive circuit includes a power supply 100 (the present invention adopts a DC power supply), a filter unit 200, a constant current unit 300, and an LED 400; the filter unit 200 is electrically connected between the power supply 100 and the control terminal of the constant current unit 300 , the constant current unit 300 provides a constant current for the LED400; wherein, the constant current unit 300 includes a constant current chip U1, an energy storage inductor L1, a freewheeling diode D1, and a voltage sampling resistor R2; one end of the energy storage inductor L1 is connected to the constant current chip U1 The voltage output pin SW of the freewheeling diode D1 is conn...

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Abstract

The invention belongs to the field of light-emitting diode (LED) driving circuits, and discloses a step-down LED driving circuit which comprises a power supply, a filter unit, a constant current unit and an LED, wherein the filter unit is electrically connected between the power supply and the constant current unit, and the constant current unit supplies constant current to the LED. According to the circuit, the design is simple and reliable, the current of an LED lamp group can be designed only by changing the value of voltage sampling resistance R2, and the circuit is simple, convenient, stable and reliable.

Description

technical field [0001] The invention belongs to LED drive circuits, in particular to a step-down LED drive circuit with DC wide voltage input and constant current output. 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, small volume per unit power, and light weight. However, its output current is fixed, and the output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 周明杰孙占民
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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