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LED drive circuit receiving alternating current input

A light-emitting diode and alternating current input technology, which is applied in the direction of lamp circuit layout, electric light source, circuit layout, etc., can solve the problems of high cost of light-emitting diodes, the inability of light-emitting diodes to be directly driven by alternating current, and the inability of wide application of light-emitting diode lighting devices, etc. , to reduce the installation cost and simplify the structure

Inactive Publication Date: 2011-05-25
MITAC PRECISION TECH(KUNSHAN) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since light emitting diodes cannot be directly driven by alternating current, the cost of using light emitting diodes as a lighting device is greatly increased, resulting in the fact that light emitting diode lighting devices cannot be widely used

Method used

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  • LED drive circuit receiving alternating current input
  • LED drive circuit receiving alternating current input
  • LED drive circuit receiving alternating current input

Examples

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Embodiment Construction

[0022] like figure 1 and figure 2 As shown, a light-emitting diode drive circuit receiving AC input provided by an embodiment of the present invention is electrically coupled to an AC power supply AC, wherein the AC power supply AC has a first output terminal V1 and a second output terminal V2, Electrically coupled to the driving circuit.

[0023] like figure 1 As shown, the driving circuit includes a first LED 111 a and a second LED 112 a , a first diode 121 and a second diode 122 .

[0024] like figure 1 As shown, the first light-emitting diode 111a, the first diode 121, the second light-emitting diode 112a, and the second diode 122 are sequentially connected in series to form a circular loop, and the first light-emitting diode 111a, the first diode 121 , the second LED 112a, and the second diode 122 all have the same forward bias direction. figure 2 The shown forward bias direction is clockwise only for convenience of illustration, and actually clockwise or countercl...

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PUM

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Abstract

The invention provides an LED drive circuit receiving alternating current input. The drive circuit comprises a first LED array, a first diode, a second LED array and a second diode which form a loop through serial connection in sequence, wherein first LEDs, the first diode, second LEDs and the second diode have the same forward bias direction; the first output end of an alternating current power supply is electrically coupled with anodes of the first LEDs and the cathode of the second diode; and the second output end of the alternating current power supply is electrically coupled with anodes of the second LEDs and the cathode of the first diode. Through receiving the alternating current, the constant LEDs in the LED drive circuit are driven under forward bias and the LEDs do not receive reverse bias, thus the LEDs are driven by the alternating current and are not damaged by reverse bias.

Description

【Technical field】 [0001] The invention relates to a driving circuit of a light emitting diode, in particular to a driving circuit of a light emitting diode receiving alternating current input. 【Background technique】 [0002] Light-emitting diodes have the advantages of small size, high luminous brightness, high photoelectric conversion efficiency, and long life. Therefore, they gradually replace general lighting appliances such as light bulbs and fluorescent tubes, and replace cold-cathode tubes as backlights for liquid crystal display modules. [0003] Existing lighting devices such as light bulbs and fluorescent tubes are driven by AC power, so the power lines supplying lighting devices are also AC power lines, but LEDs are driven by forward bias voltage provided by DC power. At this time, the light-emitting diode cannot be driven to emit light, and the over-high reverse bias voltage will cause the photoelectric conversion layer of the light-emitting diode to be broken dow...

Claims

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Application Information

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IPC IPC(8): H05B37/02F21V23/00F21Y101/02F21Y115/10
Inventor 杨士弘
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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