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Light-emitting diode (LED) driving circuit

An LED drive and circuit technology, applied in circuit devices, lamp circuit arrangements, emergency protection circuit devices, etc., can solve problems such as efficiency drop and chip failure

Inactive Publication Date: 2012-09-19
EVERLIGHT YI GUANG TECH SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When high-voltage LEDs are driven by commercial power, the voltage and current fluctuate too much, resulting in a decrease in efficiency and chip failure.

Method used

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  • Light-emitting diode (LED) driving circuit
  • Light-emitting diode (LED) driving circuit
  • Light-emitting diode (LED) driving circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0024] See eg figure 1 As shown, the LED driving circuit 10 of the first embodiment of the present invention has an input terminal 11 and an output terminal 12 . The input terminal 11 includes nodes A and B, and the input terminal 12 includes nodes C and D. The input terminal 11 is electrically connected to a power supply, and the output terminal 12 is connected to an LED, which supplies the power supply to the LED and drives the LED to light up. In this embodiment, the LEDs are combined in series and / or in parallel to form an LED array. The specification of the LED array is represented by the voltage value across the LED array. The LED driving circuit 10 mainly includes a constant current module 14, a semiconductor switch Q11 and a bias circuit 13 connected to the semiconductor switch Q11. The bias circuit 13 includes a first resistor R11 and a first Zener diode D12 connected to the first resistor R11. Wherein, the bias circuit 13 has a first end, a connection point in th...

no. 2 approach

[0029] See eg image 3 As shown, the LED driving circuit 30 of the second embodiment of the present invention has an input terminal 31 and an output terminal 32 . The input terminal 31 includes nodes A and B, and the input terminal 32 includes nodes C and D. The input end 31 is electrically connected to a power supply, and the output end 32 is connected to an LED, which supplies the power to the LED and drives the LED to light up. In this embodiment, the LEDs are combined in series and / or in parallel to form an LED array. The specification of the LED array is represented by the voltage value across the LED array. The LED driving circuit 30 mainly includes a constant current module 34, a semiconductor switch Q31 and a bias circuit 33 connected to the semiconductor switch Q31. The bias circuit 33 includes a first resistor R31 and a first Zener diode D32 connected to the first resistor R31. Wherein, the bias circuit 33 has a first end, a connection point in the circuit and a ...

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PUM

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Abstract

The invention discloses a light-emitting diode (LED) driving circuit which is provided with a input end and an output end; the input end is connected with a power supply; the output end is connected with an LED; the LED driving circuit mainly comprises a fixed current module, a semi-conductor switch and a bias circuit which is connected with the semi-conductor switch; the bias circuit comprises a first resistor and a first Zener diode which is connected with the first resistor; the semi-conductor switch is provided with three electrodes, wherein a first electrode is connected with a junction between the first resistor and the first Zener diode, a second electrode is connected with one end of the fixed current module, and a third electrode and the other end of the first resistor form the output end; and the other end of the first Zener diode and the other end of the fixed current module form the input end together with the other end of the first resistor. The LED driving circuit can be directly connected with utility power to drive the LED for lighting, and the LED is only in two states, i.e. being off and on at constant current; and the voltage rising and falling time on both ends of the LED is very short, so that the impact on a chip is very small.

Description

technical field [0001] The invention relates to a driving circuit, in particular to an LED driving circuit. Background technique [0002] With the development of LED technology, LED has been more and more used in various fields. Because LEDs are driven by DC, LEDs are often used in DC-driven applications, such as battery-powered electronic products such as mobile phones, and electronic products such as computers equipped with special power conversion circuit devices (generally called power adapters). But when it comes to applying LEDs to lighting, it needs to be rethought. [0003] Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains. LEDs are driven by 2-3V low-voltage DC, and to meet lighting requirements, complex conversion circuits must be designed. Since LED is a semiconductor device with sensitive characteristics and has negative temperature characteristics, it is necessary to ensure that it is in a stable working state during applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02H9/04
Inventor 王柏智叶元婷
Owner EVERLIGHT YI GUANG TECH SHANGHAI