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Linear constant-current LED driver

An LED driver and linear constant current technology, applied in the field of lighting equipment, can solve the problems that affect the promotion and application of LED lighting lamps, the rise of LED junction temperature, and the great influence of junction temperature, etc., and achieve easy promotion and application, uniform brightness, and small size Effect

Inactive Publication Date: 2014-01-22
CHENGDU HONGSHAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the electrical characteristics of LEDs that the average forward current of LEDs increases linearly with the increase of forward voltage, and the change of forward voltage of LEDs after forward conduction will cause great changes in the current on LEDs. , and the current has a great influence on the junction temperature of the LED. Excessive current can easily cause the LED to be damaged due to the rise of the junction temperature.
LEDs will be damaged due to voltage changes, which affects the promotion and application of LED lighting fixtures

Method used

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  • Linear constant-current LED driver

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Embodiment

[0014] Such as figure 1 As shown, a linear constant current LED driver includes a rectifier, a light emitting diode group and a constant current controller connected in sequence, wherein the rectifier includes a rectifier unit 1, a first capacitor C1 and a rectifier diode D1, and the rectifier unit 1 is a bridge rectifier circuit , the rectification unit 1 is provided with two input terminals and two output terminals, the two input terminals of the rectification unit 1 receive the input of the power supply voltage, and one input terminal of the rectification unit 1 is connected with a first resistor R1, the first resistor R1 is preferably Use a thermistor. One output end of the rectification unit 1 is connected in series with the rectification diode D1 and then connected to the LED group, the other output end of the rectification unit 1 is connected to a ground wire, and the two ends of the first capacitor C1 are respectively connected to the two output ends of the rectificati...

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Abstract

The invention discloses a linear constant-current LED driver comprising a rectifier, a light-emitting diode group and a constant-current controller, wherein the rectifier, the light-emitting diode group and the constant-current controller are successively connected. The light-emitting diode group includes a plurality of light-emitting diodes that are connected in series. The constant-current controller consists of a second resistor, a third resistor, a first triode, a second triode, a fourth voltage-stabilizing tube, and a fifth voltage-stabilizing tube. An output terminal of the light-emitting diode group is connected to a circuit between the fourth voltage-stabilizing tube and the second resistor; an anode of the fourth voltage-stabilizing tube is connected with a base electrode of the first triode; a collector of the second triode is connected with a circuit between the fourth voltage-stabilizing tube and a base electrode of the first triode; a cathode of the fifth voltage-stabilizing tube is connected with a circuit between a base electrode of the second triode and a collector of the first triode; and two terminals of the third resistor are respectively connected with a circuit between an anode of the fifth voltage-stabilizing tube and an emitter of the second triode. When the linear constant-current LED driver is used, the constant-current controller enables the current flowing through the circuit to be stable, thereby preventing the light-emitting diodes from being damaged during voltage changing.

Description

technical field [0001] The invention relates to lighting equipment, in particular to a linear constant current LED driver. Background technique [0002] With the development of society, people have higher and higher requirements for lighting equipment. Because LED has low working voltage and high luminous efficiency, the research and application of LED are becoming more and more extensive. It can be seen from the electrical characteristics of LEDs that the average forward current of LEDs increases linearly with the increase of forward voltage, and the change of forward voltage of LEDs after forward conduction will cause great changes in the current on LEDs. , and the current has a great influence on the junction temperature of the LED. Excessive current can easily cause the LED to be damaged due to the rise of the junction temperature. LEDs will be damaged due to changes in voltage, which affects the popularization and application of LED lighting fixtures. Contents of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 曾维亮
Owner CHENGDU HONGSHAN TECH
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