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LED driving device

A driving device and LED lamp technology, applied in lighting devices, light sources, electrical components, etc., can solve the problems of complex wiring and high cost

Inactive Publication Date: 2019-09-17
HANGZHOU KUANFU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to obtain a constant LED driving current, the existing circuit is too complicated and the cost is high. In order to solve this problem, the difference between the power supply voltage and a certain voltage can be added to the resistor to form a current

Method used

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  • LED driving device

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Embodiment Construction

[0008] The content of the present invention will be further described below in conjunction with the accompanying drawings.

[0009] LED drivers such as figure 1 As shown, it includes a first resistor 101, a second resistor 102, a first operational amplifier 103, a third resistor 104, a first PMOS transistor 105, a first NMOS transistor 106, a second NMOS transistor 107, an LED lamp 108 and a fourth resistor 109:

[0010] One end of the first resistor 101 is connected to the power supply voltage VCC, and the other end is connected to one end of the second resistor 102 and the positive input end of the first operational amplifier 103; one end of the second resistor 102 is connected to the first One end of the resistor 101 is connected to the positive input terminal of the first operational amplifier 103, and the other end is grounded; the positive input terminal of the first operational amplifier 103 is connected to one end of the first resistor 101 and one end of the second re...

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PUM

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Abstract

The invention discloses an LED driving device. The LED driving device includes a first resistor, a second resistor, a first operational amplifier, a third resistor, a first PMOS transistor, a first NMOS transistor, a second NMOS transistor, an LED lamp, and a fourth resistor. With the invention, a current can be formed by applying a difference between a power supply voltage and a certain voltage to the resistors.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an LED driving device. Background technique [0002] In order to obtain a constant LED driving current, the circuit in the prior art is too complicated and the cost is high. In order to solve this problem, the difference between the power supply voltage and a certain voltage can be added to the resistor to form a current. Contents of the invention [0003] The invention aims to solve the deficiencies of the prior art, and provides an LED driving device. [0004] The LED driving device includes a first resistor, a second resistor, a first operational amplifier, a third resistor, a first PMOS tube, a first NMOS tube, a second NMOS tube, an LED lamp and a fourth resistor: [0005] One end of the first resistor is connected to the power supply voltage VCC, and the other end is connected to one end of the second resistor and the positive input end of the first operation...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 胡曙敏
Owner HANGZHOU KUANFU TECH