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LED driving power supply and starting method of power tube thereof

A technology of LED driving and power tube, which is applied in the field of LED driving power supply and the opening of power tube to avoid EMI problems

Inactive Publication Date: 2019-01-01
上海卓弘微系统科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an LED drive power supply and a method for turning on its power tube to solve problems such as EMI

Method used

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  • LED driving power supply and starting method of power tube thereof
  • LED driving power supply and starting method of power tube thereof
  • LED driving power supply and starting method of power tube thereof

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Embodiment Construction

[0012] Since the EMI problem of the existing solution is mainly caused by the fixed-frequency control power tube, this embodiment proposes the following solution to change the turn-on time of the power tube, thereby avoiding problems such as EMI.

[0013] The drive power provided in this embodiment includes: a power tube controller, a power tube, and a voltage drop device, the voltage drop device is connected in series with the power tube, and the current flowing out of the power tube flows into the voltage drop device, wherein the power tube The controller specifically includes: a power tube current collection module for collecting the current flowing through the power tube; a power tube opening module for starting the power tube when the current collected by the collection module is zero; a power tube closing module , for turning off the power tube when the voltage drop across the pressure drop device reaches a predetermined value.

[0014] Another embodiment provides a cont...

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PUM

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Abstract

The invention provides an LED driving power supply and a starting method of a power tube thereof, in order to solve problems such as EMI (Electro-Magnetic Interference). The LED driving power supply comprises a power tube controller, a power tube and a voltage drop device. The voltage drop device is connected in series with the power tube, and the current flowing out of the power tube flows into the voltage drop device. The LED driving power supply is characterized in that the power tube controller specifically comprises a power tube current acquisition module used for acquiring the current flowing through the power tube, a power tube starting module used for starting the power tube when the current acquired by the acquisition module is zero, and a power tube closing module used for closing the power tube when the voltage drop of the voltage drop device reaches a preset valve.

Description

technical field [0001] The invention relates to the LED field and the power supply field, in particular to an LED driving power supply and a method for turning on a power tube thereof. Background technique [0002] Switching power supply is the main way of LED drive power supply. For the case where the external power supply is AC power supply, LED drive power supply usually has non-isolated step-down topology and isolated flyback topology to convert the input signal of the input AC power supply into a driving LED power signal. [0003] At present, there are many structures of LED driving power supply, but most of them include a power tube controller, a power tube and a resistor. The power tube and the resistor are connected in series, and the current flowing out of the power tube flows into the resistor, and further flows out through the resistor. The power tube controller controls the power tube to turn on according to the fixed frequency of its own internal oscillator, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 李高林
Owner 上海卓弘微系统科技有限公司