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Nonradiative driving circuit of LED (light-emitting diode) light source

A technology of LED light source and driving circuit, which is applied in the field of lighting, and can solve problems such as energy loss, affecting health, and complex driving circuit design.

Inactive Publication Date: 2012-07-25
李玉玲 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to adapt to the wide voltage of 85V ~ 265V, the current general-purpose LED light source driving circuit has a complicated design of the driving circuit, and uses a pulse width modulation circuit. Since the pulse width modulation circuit must have an oscillation link, electromagnetic radiation is generated, which not only loses energy but also affects human health

Method used

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  • Nonradiative driving circuit of LED (light-emitting diode) light source

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Embodiment Construction

[0005] The rectifier bridge in the circuit can use 4 rectifier diodes, or a packaged rectifier bridge. The whole drive circuit can be packaged in a metal shell, except for the 2 input lines, lead out the positive and negative lines connected to the LED. If you want better versatility, you can package the adjustment resistor R2 of the constant current source outside, through Change the resistance value of R2 to adapt to different driving power.

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Abstract

The invention belongs to the field of illumination and relates to a nonradiative driving circuit of an LED (light-emitting diode) light source. The nonradiative driving circuit is characterized in that input 220V (or110V) alternating current is rectified and filtered to light an LED up, a constant-current link is connected in series in the circuit so as to guarantee that the current passing through the LED is constant. In order to overcome radiation and stroboflash, the circuit adopts a pure alternating current solution, the electromagnetic radiation is zero; since a pulse-width modulation link is omitted, the circuit is simple, few components are used, the reliability is high, and the cost is low. In order to reduce the impact current in starting, a current limiting and protecting link is added in front of a filter capacitor. In order to meet the illumination requirement for different powers, adjusting resistance of the constant-current link is changed.

Description

technical field [0001] The invention belongs to the lighting field, and converts 220V (or 110V) alternating current into direct current with small ripple coefficient through a rectification and filter circuit, and then drives LEDs to emit light through a constant current link. technical background [0002] At present, in order to adapt to the wide voltage of 85V ~ 265V, the general-purpose LED light source driving circuit has a complicated design of the driving circuit, and uses a pulse width modulation circuit. Since the pulse width modulation circuit must have an oscillation link, electromagnetic radiation is generated, which not only loses energy but also affects people's health. After testing the drive circuits selected (different manufacturers, different powers), the radiation at a distance of 100mm from the light source is 100μw / cm 2 ~2000μw / cm 2 , the safe radiation amount stipulated by the national standard is 25μw / cm 2 . Especially as a desk lamp light source, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 李玉玲朱建华朱东初
Owner 李玉玲