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LED driving method, and LED driving circuit and LED lighting lamp by using same

A technology of LED driving and LED light string, applied in the direction of electrical components, etc., can solve the problem of short service life of LED light source

Pending Publication Date: 2020-05-19
安徽乐图电子科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an LED drive circuit to solve the problem of short service life of the LED light source in the prior art

Method used

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  • LED driving method, and LED driving circuit and LED lighting lamp by using same
  • LED driving method, and LED driving circuit and LED lighting lamp by using same
  • LED driving method, and LED driving circuit and LED lighting lamp by using same

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Embodiment Construction

[0034] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0035] refer to figure 1 , shows a functional block diagram of an LED driving circuit according to an embodiment of the present invention. The LED driver circuit 200 receives the input voltage V IN to generate a certain output current I OUT To drive the LED light source 204 composed of 3 LED lamp strings, the 3 LED lamp strings are connected in parallel to the output voltage V of the LED driving circuit 200 OUT and ground potential.

[0036] Here, the LED driving circuit 200 includes a failure judging circuit 201 , a current control circuit 202 and a power stage circuit 203 including main power devices. in,

[0037] The LED light source 204 is connected b...

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Abstract

The invention belongs to the technical field of integrated circuits, and especially relates to an LED driving method, and an LED driving circuit and an LED lighting lamp by using the same. The LED driving circuit comprises a failure judgment circuit and a current control current, and the failure judgment circuit is connected with n paths of LED lamp strings to generate a judgment signal representing the number of failed LED lamp strings; the current control circuit is connected with the failure judgment circuit so as to receive the judgment signal; when the n paths of LED lamp strings are alleffective, the current control circuit maintains the driving current to be the first current according to the expected driving current of the LED lamp strings, and the numerical value of the first current is n times of the numerical value of the expected driving current; when the m LED lamp strings fail, the driving current is the second current, and the ratio of the numerical value of the secondcurrent to the numerical value of the first current is (n-m) / n. According to the invention, it is ensured that the current borne by the LED lamp strings is consistent with the expected driving currentrequired by the LED lamp strings, and the service life of the LED lamp strings is not affected due to the overlarge working current of the LED lamp strings.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an LED driving method and an LED driving circuit, and an LED lighting fixture using the LED driving method or the LED driving circuit. Background technique [0002] With the continuous innovation and rapid development of the lighting industry, coupled with the increasing importance of energy saving and environmental protection, LED lighting, as a revolutionary energy-saving lighting technology, is developing rapidly. LED lighting products are mainly composed of three parts: LED light source, LED drive circuit and heat dissipation mechanism. Among them, the combination of LED light sources can have various forms, for example, multiple LED lamp beads are connected in series to form a single string structure, or multiple LED lamp beads are connected in series to form an LED light string, and then multiple LED light strings are connected in parallel Connectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/30
Inventor 宋祖梅陈圣伦
Owner 安徽乐图电子科技股份有限公司
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