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Driving circuit for driving multi group DC light source

A driving circuit and light source technology, applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problems of inconsistent current, uneven brightness, and inapplicability, and achieve the effect of reducing costs

Inactive Publication Date: 2009-02-04
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, LEDs are currently only suitable for small-sized display panels. This is because in large-sized panels, a large number of LEDs must be connected in series to illuminate the entire panel, but the more LEDs connected in series, the activation voltage will increase. Generally speaking, every LED connected in series needs to increase the voltage of 3.5V. If multiple LEDs are connected in parallel, the brightness will be uneven due to the inconsistent current flowing through each LED. backlight, and cannot be applied to large-sized panels

Method used

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  • Driving circuit for driving multi group DC light source
  • Driving circuit for driving multi group DC light source

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Embodiment Construction

[0024] 2 is a drive circuit 200 for driving multiple groups of DC light sources of the present invention, which includes a DC-to-DC converter 202, light-emitting components 204, 206, 208, ... and 210, and a current mirror circuit 212, wherein each light-emitting component It is composed of multiple LEDs connected in series, and the DC-to-DC converter 202 can be a step-up DC-to-DC converter or a step-down DC-to-DC converter. The DC-to-DC converter 202 converts the input voltage V in1 converted to voltage V in2 Supply to each group of light-emitting components 204, 206, 208, . . . 210, and the reference branch and a plurality of mirror branches of the current mirror circuit 212 are respectively connected to the ground potential GND through resistors R1, R2, R3, ... and Rn, in addition, the DC-to-DC converter 202 is controlled by the current mirror circuit 212 The reference branch receives a feedback current I FB . In this embodiment, the current mirror circuit 212 is a propo...

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Abstract

A drive circuit driving multiple sets of DC light sources utilizes a DC to DC converter to supply a voltage to multiple parallel luminous components and utilizing a current mirror circuit to provide multiple same current to said multiple luminous component to enable brightness of the luminous components the same.

Description

technical field [0001] The invention relates to a DC light source drive circuit, in particular to a drive circuit for driving multiple sets of DC light sources. Background technique [0002] At present, cold cathode fluorescent lamps (Cold Cathode Fluorescent Lamp; CCFL) are used as the backlight on large-size display panels. However, cold cathode fluorescent lamps need AC power to drive, so for panels using DC power, an additional DC-to-AC converter must be added. , thus increasing the cost and volume of the circuit, so another light source component using a DC power source——Light Emitting Diode (LED), gradually attracts attention. [0003] Fig. 1 is the drive circuit 100 of traditional LED, and it comprises a step-up or step-down DC-to-DC converter 102, and it has input terminal V IN Connect the input node 104, the input terminal SW is connected to the node 106, the input terminal SHON receives a time pulse 108, the ground terminal GND is connected to the ground potential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/00
Inventor 叶清强白忠龙魏维信
Owner RICHTEK TECH