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Light-dimming LED controller and output short-circuit protection method thereof

A technology of LED controller and dimming control circuit, which is applied in emergency protection circuit devices, overcurrent protection, light source, etc., can solve the problems of high cost, complex circuit structure, unsafety, etc., and achieve low cost, The circuit structure is simple, and the effect of preventing short circuit of LED load

Active Publication Date: 2014-04-16
SELF ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the existing dimming LED controllers do not have an output short-circuit protection circuit. When the controller is used, there will be unsafe factors.
Even if some dimming LED controllers are equipped with an output short-circuit protection circuit, the circuit structure is complex and the cost is high

Method used

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  • Light-dimming LED controller and output short-circuit protection method thereof
  • Light-dimming LED controller and output short-circuit protection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] see figure 1 The dimming LED controller shown includes a dimming control circuit with an output terminal connected to an external LED load and an output short-circuit protection circuit, wherein the dimming control circuit includes a single-chip controller N1 and a switch tube Q1, and the single-chip controller N1 adopts a model of The microprocessor with comparator of PIC12F629, an I / O input / output port (the 5th pin GP2) resistance R4 of single-chip controller N1 is connected with the gate of described switching tube Q1 behind, and the grid of described switching tube Q1 The source is grounded, the drain of the switching tube Q1 is connected to the negative input terminal of the external LED load; the positive input terminal of the external LED load is connected to the positive power input terminal; and the output short-circuit protection circuit includes the first voltage dividing resistor R1 and the second Two voltage-dividing resistors R2; wherein, the power input t...

Embodiment 2

[0024] The difference from Embodiment 1 is that it also includes an input anti-reverse circuit, see figure 2 As shown, the input anti-reverse circuit includes a first diode D1 and a second diode D2; the anode of the first diode D1 is connected to the input terminal of the positive power supply, and the cathode of the first diode D1 is connected to the first diode D1. The first end of a voltage dividing resistor R1; the anode of the second diode D2 is connected to the positive power input end, and the cathode of the second diode D2 is connected to the step-down module and then connected to the power input end of the single-chip controller N1 .

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PUM

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Abstract

The invention relates to a light-dimming LED controller, which comprises a light-dimming control circuit, wherein the output end of the light-dimming control circuit is connected with an external LED load; and the light-dimming control circuit comprises a singlechip microcomputer controller and a switch tube, wherein an I / O (Input / Output) port of the singlechip microcomputer controller is connected with a grid electrode of the switch tube, a source electrode of the switch tube is grounded, and a drain electrode of the switch tube is connected with the cathode input end of the external LED load. The light-dimming LED controller is characterized by further comprising an output short-circuit protection circuit, wherein the output short-circuit protection circuit comprises a first divider resistor and a second divider resistor, the first end of the first divider resistor is connected with the input end of a positive power supply, the second end of the first divider resistor is connected with the first end of the second divider resistor, and the second end of the second divider resistor is connected with the input end of a negative power supply; and the second end of the first divider resistor is connected with another I / O port of the singlechip microcomputer controller. Compared with the prior art, the light-dimming LED controller has the advantages of simple circuit structure and low cost.

Description

technical field [0001] The invention relates to an output short-circuit protection method of a dimming LED controller. Background technique [0002] Most existing dimming LED controllers do not have an output short-circuit protection circuit, and there will be unsafe factors when the controller is used. Even if some dimming LED controllers are provided with an output short-circuit protection circuit, the circuit structure is complex and the cost is relatively high. Contents of the invention [0003] The first technical problem to be solved by the present invention is to provide a dimming LED controller with an output short-circuit protection circuit with a simple circuit structure and low cost in view of the above-mentioned prior art. [0004] The second technical problem to be solved by the present invention is to provide an output short-circuit protection method of a dimming LED controller with an output short-circuit protection circuit with a simple circuit structure a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H02H7/00H02H3/08
Inventor 尤晓波林万炯
Owner SELF ELECTRONICS CO LTD