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Drive circuit and light emitting device

A technology of driving circuit and voltage dividing circuit, applied in electroluminescence light source, electric lamp circuit arrangement, electric light source and other directions, can solve the problem of low circuit efficiency, and achieve the effect of reducing power consumption, low power consumption and improving circuit efficiency

Active Publication Date: 2015-04-29
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] When the current of the light-emitting circuit is larger, the circuit efficiency is lower

Method used

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  • Drive circuit and light emitting device
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  • Drive circuit and light emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] In a driving circuit and a light-emitting device according to an embodiment of the present invention, a voltage divider circuit whose voltage drop is smaller than the reference voltage of the thyristor is connected in series between the control terminal of the thyristor and the current detection resistor, so that the voltage on the current detection resistor The voltage drop is reduced, thereby achieving the purpose of reducing the power consumption of the driving circuit by reducing the power consumption of the current detection resistor.

[0043] In order to better understand the embodiment of the present invention, a brief introduction of the silicon controlled rectifier involved in the embodiment of the present invention is as follows.

[0044] SCR, the abbreviation of silicon controlled rectifier element, is a semiconductor device with three PN junctions, also known as thyristor. With the characteristics of small size, relatively simple structure, and strong functi...

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PUM

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Abstract

Embodiments of the present invention provide a driving circuit and light-emitting device. The driving circuit is used to drive a light-emitting circuit that comprises multiple serially connected light-emitting components. The driving circuit comprises a first thyristor, a first current-limiting resistor, a current detection resistor, a thyristor switch, and a voltage-dividing circuit. One end of the first thyristor is grounded, and the other end is connected via the first current-limiting transistor to a driving terminal that provides the driving voltage; one end of the thyristor switch is connected to the light-emitting circuit, the other end is grounded via the current detection resistor, and a control end is connected to a first node located between the first thyristor and the first current-limiting resistor; the voltage drop of the voltage-dividing circuit is smaller than the reference voltage of the first thyristor; one end of the voltage-dividing circuit is connected to the control end of the first thyristor, and the other end is connected to a second node located between the current detection resistor and the thyristor switch. The present invention enhances circuit efficiency.

Description

technical field [0001] The invention relates to the driving of LED circuits, in particular to a driving circuit and a light emitting device. Background technique [0002] LED (Light Emitting Diode, light-emitting diode) has been widely used in various aspects of industry and daily life due to its small size and high efficiency. [0003] figure 1 Shown is a common LED lighting device. Such as figure 1 As shown, the LED lighting device includes a lighting circuit, a controllable switch Q1, a current detection resistor Rsen, a thyristor U1 and a first current limiting resistor R1, wherein: [0004] The light emitting circuit includes a plurality of LEDs D1, . . . , Dn connected in series; wherein n is an integer greater than 1. [0005] One end of the thyristor U1 is grounded, and the other end is connected to the drive terminal Vdrive that provides the drive voltage through the first current limiting resistor R1; [0006] The source of the controllable switch Q1 is connec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/395H05B45/46Y02B20/30H05B45/48
Inventor 焦卫军
Owner BOE TECH GRP CO LTD