Opening method of output tube of LED drive integrated circuit

A technology of LED driver and integrated circuit, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., to achieve the effect of avoiding EMI problems

Inactive Publication Date: 2011-09-21
苏州卓能微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for opening an LED driver integrated circuit and its output tube to solve problems such as EMI

Method used

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  • Opening method of output tube of LED drive integrated circuit
  • Opening method of output tube of LED drive integrated circuit
  • Opening method of output tube of LED drive integrated circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Since the EMI problem of the existing solution is mainly caused by the fixed frequency control of the output tube, this embodiment proposes the following solution to change the opening time of the output tube, thereby avoiding EMI and other problems.

[0013] The drive power provided in this embodiment includes: an output tube controller, an output tube, and a pressure drop device, the voltage drop device is connected in series with the output tube, and the current flowing out of the output tube flows into the voltage drop device, and it is characterized in that the output tube The controller specifically includes: an output tube current acquisition module for collecting the current flowing through the output tube; an output tube opening module for starting the output tube when the current collected by the acquisition module is zero; an output tube closing module , used to close the output tube when the pressure drop on the pressure drop device reaches a predetermined va...

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PUM

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Abstract

The invention provides an opening method of an output tube of an LED drive integrated circuit, solving the problems of EMI (Electro-Magnetic Interference) and the like. The LED drive integrated circuit comprises an output tube controller, the output tube and a voltage dropper, wherein the voltage dropper is connected in series with the output tube; and currents flowing out of the output tube flow into the voltage dropper. The LED drive integrated circuit is characterized in that the output tube controller particularly comprises an output tube current collecting module, an output tube opening module and an output tube closing module, wherein the output tube current collecting module is used for collecting currents flowing through the output tube; the output tube opening module is used for opening the output tube when the currents collected by the output tube current collecting module are zero; and the output tube closing module is used for closing the output tube when the voltage drop of the voltage dropper reaches a predetermined value.

Description

technical field [0001] The invention relates to the LED field and the power supply field, in particular to a method for opening an LED driving integrated circuit and an output tube thereof. Background technique [0002] Switching power supply is the main method of LED driving integrated circuit. For the case where the external power supply is AC power supply, LED driving integrated circuit usually has non-isolated step-down topology and isolated flyback topology to convert the input signal of the input AC power supply into A power signal capable of driving an LED. [0003] At present, there are various structures of LED driving integrated circuits, but most of them include an output tube controller, an output tube and a resistor, wherein the output tube and the resistor are connected in series, and the current flowing out of the output tube flows into the resistor, and further flows out through the resistor. The output tube controller controls the output tube to open accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 程玉华
Owner 苏州卓能微电子技术有限公司
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