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LED control method and circuit

A technology for controlling circuits and LED lamps, applied in the direction of energy-saving control technology, electrical components, etc., can solve the problems of low reliability of LED lamps and management chip heating, and achieve the effect of reducing the average on-state current and improving reliability.

Active Publication Date: 2022-01-25
SHAANXI REACTOR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an LED control method, which is used to solve the technical problem in the prior art that the management chip is easy to generate heat when controlling the brightness of the LED lamp, resulting in low reliability of the LED lamp.

Method used

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0040] The embodiment of the present invention proposes an LED control method, which is applied to an LED control circuit including a management chip and a drive tube, such as image 3 shown, including the following steps:

[0041] Step S301, generating a time control signal according to the comparison result between the variable voltage and the ramp voltage.

[0042] In this embodiment, the LED control circuit includes a management chip and a drive tube. The variable voltage is generated ...

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Abstract

The invention discloses an LED control method and circuit. The method comprises: generating a time control signal according to a comparison result between a variable voltage and a slope voltage; tube; the drive tube is turned on or off based on the time control signal to control the on-time length of the LED lamp; wherein the variable voltage is generated according to an external PWM signal, and the slope voltage is generated according to Generated by the voltage or current signal in the management chip, the slope voltage is related to the conduction time, the average current of the LED lamp is determined according to the conduction time, by controlling the conduction time of the LED lamp , so as to reduce the average current of the LED lamp, and will not be affected by the peak current of the LED during the dimming process, which can avoid the situation that the LED current is less than the minimum holding current of the thyristor, and improve the reliability of the LED lamp.

Description

technical field [0001] The present application relates to the field of LED control, and more specifically, to an LED control method and circuit. Background technique [0002] The intelligent dimming control of the thyristor dimming LED lamp compatible with intelligent dimming on the market is to control the brightness of the LED lamp by adjusting the current of the LED lamp. Control its brightness. [0003] Using the above control method, when the cut angle of the dimmer is very small, the brightness of the lamp is reduced to a small level or extinguished through intelligent dimming, and the LED lamp will maintain a large maintenance current, which will cause the driver chip to heat up and even damage the control chip. , or make it impossible to completely extinguish the LED light. Contents of the invention [0004] The invention provides an LED control method, which is used to solve the technical problem in the prior art that the management chip tends to heat up when co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325
CPCH05B45/325Y02B20/40
Inventor 李学敏王晓婧
Owner SHAANXI REACTOR MICROELECTRONICS