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Driving circuit and driving method

A driving circuit and driving current technology, applied in the field of electronics, can solve the problem of inability to accurately control the size of LED current

Active Publication Date: 2019-08-16
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a driving circuit and a driving method to solve the problem that the LED driving circuit in the prior art cannot precisely control the magnitude of the LED current

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "com...

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Abstract

The embodiment of the present invention provides a driving circuit and a driving method. A current bias module generates first bias current and generates second bias current through combination of thefirst bias current and the feedback current outputted from an operational amplifier. The current bias module outputs the second bias current to the negative input end of the operational amplifier andoutputs the first bias current to a driving module. The driving module generates driving current and outputs the driving current to the positive input end of an LED and the operational amplifier. Theoperational amplifier performs current negative feedback operation according to the driving current and the second bias current to obtain the feedback current and outputs the feedback current to thecurrent bias module so that the ratio of the second bias current to the driving current is within the preset range. According to the scheme, the second bias current and the driving current are used asthe input of the operational amplifier to perform current negative feedback control so that the ratio of the second bias current to the driving current is within the preset range, and the high-precision driving current can be provided.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a driving circuit and a driving method. Background technique [0002] With the development of society, in order to make mobile phones more diverse, more and more mobile phones start to use red green blue (RedGreen Blue, RGB) lighting effects and Face ID. In mobile phones, both RGB lighting effects and FaceID need to be controlled by LED drive circuits. In the LED drive circuit, multiple P-type MOS tubes form a mirror current source, among which, the MOS tube connected in the form of a diode is the mirror source, and the output current is I1, and the other MOS tubes are mirror tubes, and the output current is the same as that of I1. The current is proportional to the current. Generally, the output current of other MOS tubes is controlled by controlling the current of I1, that is, the current of the LED lamp. [0003] However, as the application environment of the LED driving...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 殷晓文吴斯敏严之嶽杜黎明孙洪军乔允庆
Owner SHANGHAI AWINIC TECH CO LTD
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