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Self-adjusting method of driving circuit of LED light fixture

A technology for LED lamps and driving circuits, which is applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve problems such as damage to LED branches.

Inactive Publication Date: 2012-05-16
HARVATEK CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcoming that the LED branch in the existing LED lamp driving circuit is easily damaged after the breakage phenomenon occurs, the present invention provides a self-adjusting method for the driving circuit of the LED lamp, which can be used when the LED branch is broken. Ensure the rest of the LED branches to work normally after the open circuit phenomenon

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  • Self-adjusting method of driving circuit of LED light fixture
  • Self-adjusting method of driving circuit of LED light fixture
  • Self-adjusting method of driving circuit of LED light fixture

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Embodiment Construction

[0021] see figure 1 , which is a schematic diagram of a driving circuit of an LED lamp disclosed by an embodiment of the present invention. Such as figure 1 As shown, the driving circuit 100 of the LED lamp disclosed in this embodiment includes a constant current driving circuit 110 and a plurality of LED branch circuits 120. The output current Iout output by the driving circuit 110 drives the LED branches 120 .

[0022] Wherein, each LED branch circuit 120 includes at least one LED (not shown). In this embodiment, the driving circuit 100 includes five LED branches 120 . Assuming that the predetermined current Iout output by the constant current driving circuit 110 is 1A, each LED branch circuit 120 receives a shunt current I1 of 200mA, so that the LEDs therein can normally emit light.

[0023] In addition, the constant current driving circuit 110 includes a constant current driving control chip 111 and a constant current detection resistor 112 . Wherein, the constant cur...

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Abstract

The invention provides a self-adjusting method of a driving circuit of an LED light fixture. The driving circuit of the LED light fixture comprises a constant current driving circuit and a plurality of LED branches. The LED branches are parallelly connected with each other and are electrically connected with the constant current driving circuit respectively so as to use an output current output by the constant current driving circuit to drive the LED branches. The self-adjusting method comprises the following steps: reducing the output current of the constant current driving circuit; detecting a voltage corresponding to the LED branches which are parallelly connected with each other; determining whether the voltage accords with a predetermined voltage value so as to generate a detection result; adjusting the output current of the constant current driving circuit according to the detection result.

Description

Technical field [0001] The invention relates to a driving circuit of an LED lamp, in particular to a self-adjusting method of the driving circuit of the LED lamp which can be automatically adjusted. Background technique [0002] Due to the characteristics of long life, low power consumption, high brightness and environmental protection, LED has gradually replaced traditional lighting devices such as incandescent lamps, fluorescent lamps and discharge lamps, and has become a new type of lighting device. [0003] The driving circuit of an existing LED lamp generally includes a constant current source and a plurality of LED branches, wherein each LED branch is electrically connected to the constant current source respectively, and these LED branches are connected in parallel with each other. In addition, each LED branch includes at least one LED. The drive circuit uses the constant current source to drive the LED branches connected in parallel to make the LED lamps emit light....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B37/03
Inventor 林惠忠
Owner HARVATEK CORPORATION
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