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Light-emitting diode (LED) driving system

A technology of LED driving, rectifying and filtering circuit, applied in the field of LED lighting, can solve the problems of difficult to realize driving circuit, inability to miniaturize, complicated circuit, etc., and achieve the effect of reducing EMI radiation, simple circuit and high power factor

Active Publication Date: 2012-10-03
SUPEC SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this method are: complex circuit, many devices used, high cost, inability to miniaturize, and it is difficult to directly install the driving circuit in the lamp holder.

Method used

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  • Light-emitting diode (LED) driving system

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Embodiment Construction

[0028] The specific embodiment of the present invention discloses an LED driving system, comprising:

[0029] rectification filter circuit;

[0030] A voltage converting circuit connected to the rectifying and filtering circuit, the voltage converting circuit has a primary winding, a first secondary winding and a second secondary winding, the primary winding receives the output voltage of the rectifying and filtering circuit, the first The secondary winding outputs a secondary current to the LED load;

[0031] a first switch, the first switch is a power MOS transistor, the drain of which is connected to the primary winding;

[0032] a primary-side sampling network, which is connected to the source of the first switch and generates a primary induced voltage when the first switch is turned on;

[0033] a driving pulse generating module, which generates a switch signal to control the gate voltage of the first switch;

[0034] A zero-crossing detection module, the input end of ...

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Abstract

The application discloses a light-emitting diode (LED) driving system comprising a rectifier filter circuit, a voltage conversion circuit which is connected with the rectifier filter circuit, a first switch, an original edge sampling network, a driving pulse generation module, a zero-crossing detection module, an average current ring, a multiplier, a second switch and a comparator, wherein when the level of the second switch at the output end of the zero-crossing detection module is low, the output end of the multiplier is connected to the input end of the average current ring. According to the LED driving system, not only can the average output of constant current and higher power factor be realized, but also the driving system can be directly arranged in an LED lamp cap because no coupler is needed to feed back the measured current, the circuits are simple, devices are few, the cost is low and the size is small.

Description

technical field [0001] The present application belongs to the field of LED lighting, and in particular relates to an LED driving system. Background technique [0002] The light characteristics of LED (Light Emitting Diode, light-emitting diode) are usually described as a function of current, not a function of voltage. A small change in the forward voltage drop of the LED will cause a large change in the LED current, thereby causing a large change in brightness . Therefore, the constant voltage source drive cannot guarantee the consistency of the LED brightness, and affects the reliability, life and light decay of the LED. Therefore, LEDs are usually driven by a constant current source. In addition, some civilian products such as mobile phone chargers must also have a constant current output function. [0003] The current latest "Energy Star" specification requires that all external electrical equipment use PFC above 75W. The latest specification in the field of lighting ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 范立新
Owner SUPEC SUZHOU
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